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Tuning Li/Ni mixing by reactive coating to boost the stability of cobalt-free Ni-rich cathode 被引量:1
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作者 Fanghui Du Xitong Zhang +7 位作者 Yingchao Wang Lei Ding Pengfang Zhang Lingyang Liu Dong Wang Jianzong Man Yuling Chen Yunwu Li 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2024年第10期20-29,I0002,共11页
Cobalt-free cathode materials are attractive for their high capacity and low cost,yet they still encounter issues with structural and surface instability.AlPO_(4),in particular,has garnered attention as an effective s... Cobalt-free cathode materials are attractive for their high capacity and low cost,yet they still encounter issues with structural and surface instability.AlPO_(4),in particular,has garnered attention as an effective stabilizer for bulk and surface.However,the impact of interfacial reactions and elemental interdiffusion between AlPO_(4) and LiNi_(0.95)Mn_(0.05)O_(2) upon sintering on the bulk and surface remains elusive.In this study,we demonstrate that during the heat treatment process,AlPO_(4) decomposes,resulting in Al doping into the bulk of the cathode through elemental interdiffusion.Simultaneously,PO_(4)^(3-)reacts with the surface Li of material to form a Li_3PO_(4) coating,inducing lithium deficiency,thereby increasing Li/Ni mixing.The suitable Li/Ni mixing,previously overlooked in AlPO_(4) modification,plays a pivotal role in stabilizing the bulk and surface,exceeding the synergy of Al doping and Li_3PO_(4) coating.The presence of Ni^(2+)ions in the lithium layers contributes to the stabilization of the delithiated structure via a structural pillar effect.Moreover,suitable Li/Ni mixing can stabilize the lattice oxygen and electrode-electrolyte interface by increasing oxygen removal energy and reducing the overlap between the Ni^(3+/4+)e_g and O^(2-)2p orbitals.These findings offer new perspectives for the design of stable cobalt-free cathode materials. 展开更多
关键词 cobalt-free Ni-rich cathode Li/Ni mixing Al doping Li_(3)PO_(4) coating Lithium-ion batteries
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Mg/Fe site-specific dual-doping to boost the performance of cobalt-free nickle-rich layered oxide cathode for high-energy lithium-ion batteries
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作者 Yunting Wang Gaohui Du +7 位作者 Di Han Wenhao Shi Jiahao Deng Huayu Li Wenqi Zhao Shukai Ding Qingmei Su Bingshe Xu 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2024年第4期670-679,共10页
Layer-type LiNi0.9Mn0.1O2is promising to be the primary cathode material for lithium-ion batteries(LIBs)due to its excellent electrochemical performance.Unfortunately,the cathode with high nickel content suffers from ... Layer-type LiNi0.9Mn0.1O2is promising to be the primary cathode material for lithium-ion batteries(LIBs)due to its excellent electrochemical performance.Unfortunately,the cathode with high nickel content suffers from severely detrimental structural transformation that causes rapid capacity attenuation.Herein,site-specific dual-doping with Fe and Mg ions is proposed to enhance the structural stability of LiNi0.9Mn0.1O2.The Fe3+dopants are inserted into transition metal sites(3b)and can favorably provide additional redox potential to compensate for charge and enhance the reversibility of anionic redox.The Mg ions are doped into the Li sites(3a)and serve as O_(2)^(-)-Mg^(2+)-O_(2)^(-)pillar to reinforce the electrostatic cohesion between the two adjacent transition-metal layers,which further suppress the cracking and the generation of harmful phase transitions,ultimately improving the cyclability.The theoretical calculations,including Bader charge and crystal orbital Hamilton populations(COHP)analyses,confirm that the doped Fe and Mg can form stable bonds with oxygen and the electrostatic repulsion of O_(2)^(-)-O_(2)^(-)can be effectively suppressed,which effectively mitigates oxygen anion loss at the high delithiation state.This dual-site doping strategy offers new avenues for understanding and regulating the crystalline oxygen redox and demonstrates significant potential for designing high-performance cobalt-free nickel-rich cathodes. 展开更多
关键词 cobalt-free Layered oxide Cathode Dual dopants Density functional theory calculation
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A universal multifunctional dual cation doping strategy towards stabilized ultra-high nickel cobalt-free lithium layered oxide cathode
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作者 Yabin Shen Dongming Yin +2 位作者 Limin Wang Gang Huang Yong Cheng 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2024年第8期296-305,I0007,共11页
Ultra-high nickel cobalt-free lithium layered oxides are promising cathode material for lithium-ion batteries(LIBs)because of their relatively high capacity and low cost.Nevertheless,the high nickel content would indu... Ultra-high nickel cobalt-free lithium layered oxides are promising cathode material for lithium-ion batteries(LIBs)because of their relatively high capacity and low cost.Nevertheless,the high nickel content would induce bulk structure degradation and interfacial environment deterioration,and the absence of Co element reduces the lithium diffusion kinetics,severely limiting the performance liberation of this kind of cathodes.Herein,a multifunctional Ti/Zr dual cation co-doping strategy has been employed to improve the lithium storage performance of LiNi_(0.9)Mn_(0.1)O_(2)(NM91)cathode.On the one hand,the Ti/Zr co-doping weakens the Li^(+)/Ni^(2+)mixing through magnetic interactions due to the inexistence of unpaired electrons for Ti^(4+)and Zr^(4+),increasing the lithium diffusion rate and suppressing the harmful coexistence of H1 and H2 phases.On the other hand,they enhance the lattice oxygen stability because of the strong Ti-O and Zr-O bonds,inhibiting the undesired H3 phase transition and lattice oxygen loss,improving the bulk structure and cathode-electrolyte interface stability.As a result,the Ti/Zr co-doped NM91(NMTZ)exhibits a 91.2%capacity retention rate after 100 cycles,while that of NM91 is only82.9%.Also,the NMTZ displays better rate performance than NM91 with output capacities of 115 and93 mA h g^(-1)at a high current density of 5 C,respectively.Moreover,the designed NMTZ could enable the full battery to deliver an energy density up to 263 W h kg^(-1),making the ultra-high nickel cobaltfree lithium layered oxide cathode closer to practical applications. 展开更多
关键词 Lithium-ion battery Ultra-high nickel cobalt-free cathode Ti/Zr co-doping Li^(+)/Ni^(2+)mixing Lattice oxygen stability
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Cobalt-Free BaFe_(0.6)Zr_(0.1)Y_(0.3)O_(3−δ)Oxygen Electrode for Reversible Protonic Ceramic Electrochemical Cells
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作者 Chenghao Yang Jin Li +2 位作者 Ao Hu Jian Pu Bo Chi 《Transactions of Tianjin University》 EI CAS 2023年第6期444-452,共9页
Reversible protonic ceramic electrochemical cells(R-PCECs)are ideal,high-effi ciency devices that are environmentally friendly and have a modular design.This paper studies BaFe_(0.6)Zr_(0.1)Y_(0.3)O_(3−δ)(BFZY3)as a ... Reversible protonic ceramic electrochemical cells(R-PCECs)are ideal,high-effi ciency devices that are environmentally friendly and have a modular design.This paper studies BaFe_(0.6)Zr_(0.1)Y_(0.3)O_(3−δ)(BFZY3)as a cobalt-free perovskite oxygen electrode for high-performance R-PCECs where Y ions doping can increase the concentration of oxygen vacancies with a remarkable increase in catalytic performance.The cell with confi guration of Ni-BZCYYb/BZCYYb/BFZY3 demonstrated promising performance in dual modes of fuel cells(FCs)and electrolysis cells(ECs)at 650℃with low polarization resistance of 0.13Ωcm^(2),peak power density of 546.59 mW/cm^(2)in FC mode,and current density of−1.03 A/cm^(2)at 1.3 V in EC mode.The alternative operation between FC and EC modes for up to eight cycles with a total of 80 h suggests that the cell with BFZY3 is exceptionally stable and reversible over the long term.The results indicated that BFZY3 has considerable potential as an air electrode material for R-PCECs,permitting effi cient oxygen reduction and water splitting. 展开更多
关键词 Protonic ceramic cells Oxygen electrode Perovskite oxides cobalt-free Oxygen vacancies
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Stabilized cobalt-free lithium-rich cathode materials with an artificial lithium fluoride coating 被引量:3
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作者 Wei Liu Jinxing Li +2 位作者 Hanying Xu Jie Li Xinping Qiu 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2022年第5期917-924,共8页
Iron-substituted cobalt-free lithium-rich manganese-based materials,with advantages of high specific capacity,high safety,and low cost,have been considered as the potential cathodes for lithium ion batteries.However,c... Iron-substituted cobalt-free lithium-rich manganese-based materials,with advantages of high specific capacity,high safety,and low cost,have been considered as the potential cathodes for lithium ion batteries.However,challenges,such as poor cycle stability and fast voltage fade during cycling under high potential,hinder these materials from commercialization.Here,we developed a method to directly coat LiF on the particle surface of Li_(1.2)Ni_(0.15)Fe_(0.1)Mn_(0.55O2).A uniform and flat film was successfully formed with a thickness about 3 nm,which can effect-ively protect the cathode material from irreversible phase transition during the deintercalation of Li^(+).After surface coating with 0.5wt%LiF,the cycling stability of Li_(1.2)Ni_(0.15)Fe_(0.1)Mn_(0.55O2) cycled at high potential was significantly improved and the voltage fade was largely suppressed. 展开更多
关键词 cobalt-free lithium-rich cathode materials lithium fluoride coating cycle stability DISSOLUTION
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Novel cobalt-free tantalum-doped perovskite Ba Fe_(1-y)Ta_yO_(3-δ)with high oxygen permeation 被引量:2
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作者 Qing Liao Yanjie Wang +1 位作者 Yan Chen Haihui Wang 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2016年第3期339-344,共6页
Cobalt-free perovskite-type oxides BaFel_yTayO3-6 (0 _〈 y -〈 0.2) were synthesized via a simple solid state reac- tion. The cubic perovskite structure can be obtained when y is over 0.1. BaFeo.Ta0.lO3-6 (BFT0.1)... Cobalt-free perovskite-type oxides BaFel_yTayO3-6 (0 _〈 y -〈 0.2) were synthesized via a simple solid state reac- tion. The cubic perovskite structure can be obtained when y is over 0.1. BaFeo.Ta0.lO3-6 (BFT0.1) membrane shows the highest oxygen permeation flux, which can reach 1.6 ml. min- 1. cm-2 at 950 ℃ under the gradient of air/He. The O2-TPD results reveal that BaFe0.9Ta0.lO3-a material shows an excellent reversibility and phase structure stability in air. The oxygen permeation flux is limited by the bulk diffusion when the membrane thick- ness is over 0.8 mm, and it is limited by both the bulk diffusion and the surface exchange when the membrane thickness is below 0.5 mm. Stable oxygen permeation fluxes are obtained during 180 h operation. 展开更多
关键词 cobalt-free PEROVSKITE-TYPE BaFe1-yTayO3-6 Oxygen permeation STABLE
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Achieving exceptional activity and durability toward oxygen reduction based on a cobalt-free perovskite for solid oxide fuel cells 被引量:1
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作者 Feifei Dong Zhenghui Gao +5 位作者 Bingkai Zhang Lu Li Ziqi Kong Zilin Ma Meng Ni Zhan Lin 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2021年第11期653-659,I0016,共8页
In response to the shortcomings of cobalt-rich cathodes, iron-based perovskite oxides appear as promising alternatives for solid oxide fuel cells (SOFCs). However, their inferior electrochemical performance at reduced... In response to the shortcomings of cobalt-rich cathodes, iron-based perovskite oxides appear as promising alternatives for solid oxide fuel cells (SOFCs). However, their inferior electrochemical performance at reduced temperatures (<700 ℃) becomes a major bottleneck for future progress. Here, a novel cobalt-free perovskite Ba_(0.75)Sr_(0.25)Fe_(0.875)Ga_(0.125)O_(3−δ) (BSFG) is developed as an efficient oxygen reduction electrode for SOFCs, featuring cubic-symmetry structure, large oxygen vacancy concentration and fast oxygen transport. Benefiting from these merits, cells incorporated with BSFG achieve exceptionally high electrochemical performance, as evidenced by a low polarization area-specific resistance of 0.074 Ω cm^(2) and a high peak power density of 1145 mW cm^(−2) at 600 ℃. Meanwhile, a robust short-term performance stability of BSFG cathode can be ascribed to the stable crystalline structure and favorable thermal expansion behavior. First-principles computations are also conducted to understanding the superior activity and durability toward oxygen reduction reaction. These pave the way for rationally developing highly active and robust cobalt-free perovskite-type cathode materials for reduced-temperature SOFCs. 展开更多
关键词 Solid oxide fuel cell CATHODE PEROVSKITE Oxygen reduction reaction cobalt-free
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Manufacturing of T300 cobalt-free maraging steel and its tensile property
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作者 GUO Junxia ZHANG Jinghai TIAN Yuxin 《Baosteel Technical Research》 CAS 2011年第4期3-7,共5页
The 18Ni 300 grade cobalt-free maraging steel T300 was successfully manufactured on an industrial scale by application of vacuum induction melting (VIM) and vacuum arc remelting (VAR) process at Baosteel. With the... The 18Ni 300 grade cobalt-free maraging steel T300 was successfully manufactured on an industrial scale by application of vacuum induction melting (VIM) and vacuum arc remelting (VAR) process at Baosteel. With the content of O and N less than 15 ppm and 10 ppm respectively ( 1 ppm = 10 -6 ) ,the T300 steel produced by Baosteel obtained a high degree of purity and a good combination of ultra-high strength and fracture toughness. The effects of solution temperature and ageing temperature on tensile property of solution-treated and aged T300 steel were investigated. The results show that the solution temperature slightly influences the strength of the solution-treated steel, indicating that the solution strengthening rather than the grain boundary strengthening is more important to the solution-treated steel. For the solution-treated T300, the elongation and reduction of area don't change much with a rising solution temperature, and remain above 17% and 70% respectively at the solution temperature ranging from 800℃ to 1200℃. For the aged T300 steel,the strength and elongation are reduced with an increasing solution temperature, and the solution temperature has a greater effect on the reduction of area than that on the elongation. The reduction of area of the aged steel reaches a high peak when the solution temperature reaches 920℃. The experimental data indicates that precipitation strengthening makes a contribution of l 100 MPa to the tensile strength of the aged steel. The ageing temperature exerts a greater effect on the strength than on the elongation and reduction of area. The steel achieves a better combination of strength and toughness at the peak ageing temperature of 500℃. 展开更多
关键词 cobalt-free maraging steel cleanness heat treatment tensile property
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A Study of Neutron and Gamma-Ray Interaction Properties with Cobalt-Free Highly Chromium Maraging Steel
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作者 M. M. Kassab S. U. El-Kameesy +1 位作者 M. M. Eissa A. Abdel-Latif M 《Journal of Modern Physics》 2015年第11期1526-1532,共7页
Cobalt-free maraging steels of different compositions have been prepared by electro-slag remelting technique using titanium and chromium instead of cobalt. Neutron removal cross-sections have been calculated, also mas... Cobalt-free maraging steels of different compositions have been prepared by electro-slag remelting technique using titanium and chromium instead of cobalt. Neutron removal cross-sections have been calculated, also mass attenuation coefficients and effective electron densities have been determined for the prepared samples in the photon energy range up to 2.8 MeV. Other steel alloys and lead samples have also been investigated for the sake of comparison. The results prove the superiority of cobalt-free maraging steels compared with the other steel types to be used as a proper shielding material in the nuclear field. Among the investigated steels, the steel “0.045%C- 13.35%Ni-2.05%Cr-4.5%Mo-0.06%Ti” has the best attenuation properties. 展开更多
关键词 Maraging Steel cobalt-free Mass Attenuation COEFFICIENTS Effective Electron Density Fast NEUTRON Removal CROSS-SECTION
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Investigation of a Modified Cobalt-Free Alloy for Nuclear Application
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作者 Mamdouh Mahmoud Eissa Maged Mahmoud Kassab +1 位作者 Samir Uoshaa El-Kameesy Ahamed Abdel-Latif Mohamed 《Journal of Materials Science and Chemical Engineering》 2015年第9期52-56,共5页
Cobalt-free alloy of constituent’s “0.045%C-12.73%Ni-6.53%Cr-3.2%Mo-0.02%Ti-0.01%V” has been prepared by electro slag remelting technique. Mass attenuation coefficient, half value layer and effective atomic number ... Cobalt-free alloy of constituent’s “0.045%C-12.73%Ni-6.53%Cr-3.2%Mo-0.02%Ti-0.01%V” has been prepared by electro slag remelting technique. Mass attenuation coefficient, half value layer and effective atomic number have been determined for the prepared sample at photon energies 235 - 2700 keV. The results are compared with the corresponding theoretical calculations based on XCOM program and a fair agreement is obtained. 展开更多
关键词 COBALT Free GAMMA SHIELDING Effective ATOMIC Number Mass ATTENUATION COEFFICIENT
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Enhanced rate capability and mitigated capacity decay of ultrahigh-nickel cobalt-free LiNi_(0.9)Mn_(0.1)O_(2) cathode at high-voltage by selective tungsten substitution 被引量:2
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作者 Xingyuan Wang Bao Zhang +4 位作者 Zhiming Xiao Lei Ming Minghuang Li Lei Cheng Xing Ou 《Chinese Chemical Letters》 SCIE CAS CSCD 2023年第7期354-359,共6页
Owing to the further requirement for electric vehicle market, it is appropriate to lower the cost and improve the energy density of lithium-ion batteries by adopting the Co-free and Ni-rich layered cathodes.However, t... Owing to the further requirement for electric vehicle market, it is appropriate to lower the cost and improve the energy density of lithium-ion batteries by adopting the Co-free and Ni-rich layered cathodes.However, their practical application is severely limited by structural instability and slow kinetics. Herein,ultrahigh-nickel cobalt-free LiNi_(0.9)Mn_(0.1)O_(2) cathode is elaborate designed via in-situ trace substitution of tungsten by a wet co-precipitation method following by high-temperature sintering. It is revealed that the in-situ doping strategy of high valence W^(6+) can effectively improve the structure stability by reducing irreversible phase transition and suppressing the formation of microcracks. Moreover, the transformed fine particles determined by W-doping can facilitate the kinetic characteristics by shortening Li^(+) diffusion paths. As expected, 0.3 mol% W-doped LiNi_(0.9)Mn_(0.1)O_(2) cathode exhibits a high specific capacity of 143.5 mAh/g after 200 cycles at high rate of 5 C in the wide potential range of 2.8-4.5 V, representing a potential next-generation cathode with low-cost, high energy-density and fast-charging capabilities. 展开更多
关键词 Lithium-ion batteries Ultrahigh-nickel cobalt-free cathode In-situ tungsten doping High cut-off voltage Rapid charge performance
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Influence of Solution Treatment on Impact Toughness and Microstructure of Cobalt-free Maraging Steel
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作者 Yu Jianmin1, Li Baocheng1, Zhang Baohong2, Yang Weiyu2 1North University of China, Taiyuan 030051, China 2Engineering Research Center of Magnesium-base Material Processing Technology, Ministry of Education, Taiyuan 030051, China 《稀有金属材料与工程》 SCIE EI CAS CSCD 北大核心 2011年第S3期114-117,共4页
The influence of different solution temperature on microstructure and impact toughness of cobalt-free maraging steel 00Ni14Cr3Mo3Ti was investigated by SEM and X-Ray diffractometer.The experimental results showed that... The influence of different solution temperature on microstructure and impact toughness of cobalt-free maraging steel 00Ni14Cr3Mo3Ti was investigated by SEM and X-Ray diffractometer.The experimental results showed that with the solution temperature variation, the martensite morphology has not changed, is still lath martensite.Undissolved Laves phase hindered the dislocation movement after 750 ℃ solution heat treatment, which result in a very low impact absorbed energy, the impact fracture has no obvious plastic deformation, with bad toughness.With the solution temperature increased, the undissolved phase gradually dissolved, the impact absorbed energy increased gradually.All the Laves phase dissolved when reach to 900 ℃, the impact absorbed energy reaches the maximum, is 61 J.Fracture morphology change from brittle fracture into toughness transgranular fracture with deep dimple. When solution temperature is above 900 ℃, with the solution temperature further increase, austenite grain size increases significantly.Average grain diameter of austenite is about 70 μm after 1050 ℃ solution treatment, the density of precipitates on the grain boundary of maraging steel is increase substantially, deformation compatibility deteriorate, which result in the impact absorbed energy decreased significantly.Fracture type becomes transgranular and quasi-cleavage mixed fracture with the characteristics of the river patterns from ductile transgranular fracture. 展开更多
关键词 cobalt-free maraging STEEL SOLUTION treatment impact TOUGHNESS SEPARATION
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高镍无钴正极材料研究进展
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作者 吴华城 张明铝 +1 位作者 吴佳霓 李军 《化工新型材料》 CAS CSCD 北大核心 2024年第8期73-76,共4页
高镍无钴正极材料具有低毒性、低成本、高比能的特点,是目前锂离子电池正极材料的研究热点之一。介绍了高镍无钴正极材料制备方法及其改性研究进展,指出通过优化制备工艺可以提高正极材料的结构稳定性;利用体相掺杂和表面包覆改性可以... 高镍无钴正极材料具有低毒性、低成本、高比能的特点,是目前锂离子电池正极材料的研究热点之一。介绍了高镍无钴正极材料制备方法及其改性研究进展,指出通过优化制备工艺可以提高正极材料的结构稳定性;利用体相掺杂和表面包覆改性可以改善材料的电化学性能。未来应注重高镍无钴正极材料失效机理和复合改性机理的研究,解决其结构不稳定和倍率性能差等问题。 展开更多
关键词 锂离子电池 高镍 无钴 正极材料
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无钴富镍正极材料的火焰辅助喷雾热解合成与性能研究
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作者 陈国徽 王君雷 +3 位作者 李世龙 李金宇 徐运飞 王昆 《新能源进展》 CSCD 北大核心 2024年第3期260-268,共9页
锂离子电池富镍三元正极材料因其成本低、容量高的优势受到广泛关注,受限于钴的高毒性、低储量,富镍正极材料无钴化成为锂离子电池未来的发展趋势。传统液相法制备无钴富镍材料存在步骤繁琐、耗时长、副产物多等问题。火焰辅助喷雾热解(... 锂离子电池富镍三元正极材料因其成本低、容量高的优势受到广泛关注,受限于钴的高毒性、低储量,富镍正极材料无钴化成为锂离子电池未来的发展趋势。传统液相法制备无钴富镍材料存在步骤繁琐、耗时长、副产物多等问题。火焰辅助喷雾热解(FASP)方法可一步合成正极材料,具有设备简单、耗时短、环境友好等优点。采用FASP方法制备LiNi_(0.8)Mn_(0.2)O_(2)(NM82)无钴富镍正极材料,探究合成条件对NM82结构、形貌和电化学性能的影响。结果表明,FASP可一步合成NM82正极材料,且其在载气流速1.5L/min、锂过量10%、退火温度800℃条件下的锂镍混排水平最低,放电比容量最高,在0.1C倍率下达到180.2mA∙h/g。 展开更多
关键词 火焰辅助喷雾热解 无钴富镍正极材料 锂离子电池 电化学性能
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新型高镍无钴正极材料LiNi_(0.94)Mn_(0.04)Al_(0.02)O_(2)的合成研究
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作者 杨泽龙 孟奇 《稀有金属与硬质合金》 CAS CSCD 北大核心 2024年第1期106-111,共6页
采用固相烧结工艺合成了层状高镍无钴正极材料LiNi_(0.94)Mn_(0.04)Al_(0.02)O_(2)(NMA),并研究了不同烧结温度对NMA正极材料的晶体结构、微观形貌和电化学性能的影响。结果表明,当烧结温度过低时,NMA正极材料的结晶度偏低,并在表面形... 采用固相烧结工艺合成了层状高镍无钴正极材料LiNi_(0.94)Mn_(0.04)Al_(0.02)O_(2)(NMA),并研究了不同烧结温度对NMA正极材料的晶体结构、微观形貌和电化学性能的影响。结果表明,当烧结温度过低时,NMA正极材料的结晶度偏低,并在表面形成残锂。烧结温度过高则会导致层状结构变差和电极表面有害副反应增多。在最佳烧结温度750℃下合成的NMA-750材料具有良好的颗粒形貌、最少的锂镍混排和最完整的层状结构,同时具有最佳的电化学性能:首圈放电比容量(3.0~4.5 V,1 C)为199.5 mA·h/g,循环100圈后容量保持率可达79.04%;在5 C下仍具有147.6 mA·h/g的放电比容量,倍率性能优良。 展开更多
关键词 高镍无钴正极材料 LiNi_(0.94)Mn_(0.04)Al_(0.02)O_(2) 烧结温度 晶体结构 微观形貌 电化学性能 层状结构
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锂离子电池无钴正极材料的研究
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作者 曾艳红 陈浩 宋丹丹 《电池工业》 CAS 2024年第2期99-108,共10页
锂离子电池因其具有高能量密度,几十年来一直垄断着便携式电子产品和电动汽车的储能市场。然而,领先的电池制造商正试图通过减少对正极材料中钴的依赖来降低制造成本。本文通过回顾新型无钴正极的背景、发展现状和面临的挑战,探讨了发... 锂离子电池因其具有高能量密度,几十年来一直垄断着便携式电子产品和电动汽车的储能市场。然而,领先的电池制造商正试图通过减少对正极材料中钴的依赖来降低制造成本。本文通过回顾新型无钴正极的背景、发展现状和面临的挑战,探讨了发展锂离子电池无钴正极材料需要考虑的几个方面。最后,从实际出发,展望了锂离子电池无钴正极的研究方向。 展开更多
关键词 无钴 锂离子电池 正极材料
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铈掺杂无钴高镍正极材料LiNi_(0.6)Mn_(0.4)O_(2)的制备及性能 被引量:1
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作者 袁盛旭 李豪 +3 位作者 邓伟锋 李劲超 张亚萍 段浩 《西南科技大学学报》 CAS 2023年第2期1-8,共8页
为获得无钴高镍正极材料LiNi_(0.6)Mn_(0.4)O_(2)(NM64)的最佳合成方法,采用水热法和共沉淀法对其进行制备,确定共沉淀法为NM64材料的较佳制备方法。为进一步提高共沉淀法制备的NM64材料(下称“NM64-C”)的倍率性能和循环性能,采用Ce离... 为获得无钴高镍正极材料LiNi_(0.6)Mn_(0.4)O_(2)(NM64)的最佳合成方法,采用水热法和共沉淀法对其进行制备,确定共沉淀法为NM64材料的较佳制备方法。为进一步提高共沉淀法制备的NM64材料(下称“NM64-C”)的倍率性能和循环性能,采用Ce离子掺杂对NM64-C进行了优化。结果表明:摩尔比为0.02的Ce离子(0.02Ce)掺杂的NM64-C材料在0.3 C下100次循环后的容量保留率为79.5%,明显优于基材NM64-C(63.9%)。0.02Ce掺杂的NM64-C材料展现出了良好的电化学性能。 展开更多
关键词 无钴高镍正极材料 铈离子掺杂 锂离子电池
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锂离子电池无钴富镍层状正极材料的研究现状及前景
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作者 战令浩 梁红梅 +3 位作者 谢乐琼 王莉 虞兰剑 何向明 《电池工业》 CAS 2023年第6期305-315,共11页
目前钴元素在锂离子电池正极材料中被广泛应用,其对材料循环性能和结构稳定性的提升表现优异。然而因为钴价格高昂、供应链存在风险以及开采受限等因素,降低正极材料中钴的含量甚至实现无钴化是当前的主要研究方向。无钴富镍层状材料成... 目前钴元素在锂离子电池正极材料中被广泛应用,其对材料循环性能和结构稳定性的提升表现优异。然而因为钴价格高昂、供应链存在风险以及开采受限等因素,降低正极材料中钴的含量甚至实现无钴化是当前的主要研究方向。无钴富镍层状材料成本低、能量密度高,具有一定优势。本文综述了无钴富镍层状正极材料的合成方法和改善性能的手段,有助于研究人员了解该材料的研究进展。 展开更多
关键词 锂离子电池 层状氧化物 无钴富镍正极
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钼掺杂提升无钴高镍LiNi_(0.9)Mn_(0.1)O_(2)正极材料倍率性能和循环稳定性研究
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作者 马静涛 李聪 +2 位作者 李阿飞 胡成志 陈章贤 《化工新型材料》 CAS CSCD 北大核心 2023年第7期121-126,共6页
由于钴价格的不稳定,无钴高镍LiNi_(0.9)Mn_(0.1)O_(2)被认为是未来有潜力的正极材料,但是倍率性能弱和循环寿命短的问题阻碍了其商业化。通过Mo元素对无钴高镍LiNi_(0.9)Mn_(0.1)O_(2)正极材料进行掺杂改性,延缓材料在充电阶段的有害相... 由于钴价格的不稳定,无钴高镍LiNi_(0.9)Mn_(0.1)O_(2)被认为是未来有潜力的正极材料,但是倍率性能弱和循环寿命短的问题阻碍了其商业化。通过Mo元素对无钴高镍LiNi_(0.9)Mn_(0.1)O_(2)正极材料进行掺杂改性,延缓材料在充电阶段的有害相变,进而提升材料的倍率性能和循环稳定性。在1C倍率下,循环500圈后有着73.3%的容量保持率;即使在10C的高倍率下,依然有着152.05mAh/g的高放电容量。本研究为用于电动汽车的锂离子正极材料提供了新的选择。 展开更多
关键词 无钴 钼掺杂 锂离子电池 高镍 正极材料
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Fe/W共掺杂对LiNiO_(2)正极材料结构和电化学性能的影响
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作者 刘小九 李东林 +3 位作者 任旭强 高建行 张龙 陆继承 《功能材料》 CAS CSCD 北大核心 2023年第5期5192-5197,5209,共7页
通过溶胶-凝胶法合成了铁、钨共同掺杂的镍酸锂正极材料(LiNi_(0.97)Fe_(0.02)W_(0.01)O_(2)),研究了双阳离子掺杂对镍酸锂正极材料电化学性能的影响。结果表明,铁、钨共同掺杂可以显著降低镍酸锂的阳离子混排,抑制H2到H3的相变,提高循... 通过溶胶-凝胶法合成了铁、钨共同掺杂的镍酸锂正极材料(LiNi_(0.97)Fe_(0.02)W_(0.01)O_(2)),研究了双阳离子掺杂对镍酸锂正极材料电化学性能的影响。结果表明,铁、钨共同掺杂可以显著降低镍酸锂的阳离子混排,抑制H2到H3的相变,提高循环稳定性并且降低电压平台的衰减。在200 mA/g的电流密度下,LiNi_(0.97)Fe_(0.02)W_(0.01)O_(2)材料循环100次后容量保持率为88.1%,而LiNiO_(2)材料容量保持率仅为62.9%。此外,LiNi_(0.97)Fe_(0.02)W_(0.01)O_(2)材料也具有更加优异的倍率性能(4000 mA/g的电流密度下放电比容量126.3 mAh/g)。因此,Fe/W共掺杂有利于提高无钴高镍层状氧化物正极材料的电化学性能。 展开更多
关键词 锂离子电池 无钴层状氧化物正极材料 双阳离子掺杂 电化学性能
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