Li/Ni mixing negatively influences the discharge capacity of lithium nickel oxide and high-nickel ternary cathode materials.However,accurately measuring the Li/Ni mixing degree is difficult due to the preferred orient...Li/Ni mixing negatively influences the discharge capacity of lithium nickel oxide and high-nickel ternary cathode materials.However,accurately measuring the Li/Ni mixing degree is difficult due to the preferred orientation of labbased XRD measurements using Bragg–Brentano geometry.Here,we find that employing spherical harmonics in Rietveld refinement to eliminate the preferred orientation can significantly decrease the measurement error of the Li/Ni mixing ratio.The Li/Ni mixing ratio obtained from Rietveld refinement with spherical harmonics shows a strong correlation with discharge capacity,which means the electrochemical capacity of lithium nickel oxide and high-nickel ternary cathode can be estimated by the Li/Ni mixing degree.Our findings provide a simple and accurate method to estimate the Li/Ni mixing degree,which is valuable to the structural analysis and screening of the synthesis conditions of lithium nickel oxide and high-nickel ternary cathode materials.展开更多
1.Introduction To date,the application of lithium-ion batteries(LIBs)has been expanded from traditional consumer electronics to electric vehicles(EVs),energy storage,special fields,and other application scenarios.The ...1.Introduction To date,the application of lithium-ion batteries(LIBs)has been expanded from traditional consumer electronics to electric vehicles(EVs),energy storage,special fields,and other application scenarios.The production capacity of LIBs is increasing rapidly,from 26 GW·h in 2011 to 747 GW·h in 2020,76% of which comes from China[1].展开更多
能源危机和环境问题制约着社会发展与人类进步,新型可再生清洁能源的开发利用是解决能源危机和环境问题行之有效的途径,先进储能技术在可再生清洁能源的开发利用过程中具有至关重要的作用。基于储能技术发展的重要性,文章简略介绍了各...能源危机和环境问题制约着社会发展与人类进步,新型可再生清洁能源的开发利用是解决能源危机和环境问题行之有效的途径,先进储能技术在可再生清洁能源的开发利用过程中具有至关重要的作用。基于储能技术发展的重要性,文章简略介绍了各种先进储能技术,并结合Web of Science搜索引擎,从科技论文发表的年份、国家/地区、机构和专利等角度,对各种先进储能技术进行了文献检索统计,分析其发展趋势。在众多的储能技术中,锂离子电池、超级电容器、钠离子电池、飞轮、超导磁储存、固态电池等基础研究方向比较活跃;锂离子电池、飞轮、超级电容器、压缩空气储能、铅酸电池等则在技术开发方向比较突出。展开更多
High-energy-density rechargeable lithium batteries are being pursued by researchers because of their revolutionary potential nature.Current advanced practical lithium-ion batteries have an energy density of around300 ...High-energy-density rechargeable lithium batteries are being pursued by researchers because of their revolutionary potential nature.Current advanced practical lithium-ion batteries have an energy density of around300 W·h·kg^(-1).Continuing to increase the energy density of batteries to a higher level could lead to a major explosion development in some fields,such as electric aviation.Here,we have manufactured practical pouch-type rechargeable lithium batteries with both a gravimetric energy density of 711.3 W·h·kg^(-1)and a volumetric energy density of 1653.65 W·h·L^(-1).This is achieved through the use of high-performance battery materials including high-capacity lithium-rich manganese-based cathode and thin lithium metal anode with high specific energy,combined with extremely advanced process technologies such as high-loading electrode preparation and lean electrolyte injection.In this battery material system,the structural stability of cathode material in a widened charge/discharge voltage range and the deposition/dissolution behavior of interfacial modified thin lithium electrode are studied.展开更多
Structural transformation behaviors of several typical oxide cathode materials during a heating process are reviewed in detail to provide in-depth understanding of the key factors governing the thermal stability of th...Structural transformation behaviors of several typical oxide cathode materials during a heating process are reviewed in detail to provide in-depth understanding of the key factors governing the thermal stability of these materials. We also discuss applying the information about beat induced structural evolution in the study of electrochemically induced structural changes. All these discussions are expected to provide valuable insights for designing oxide cathode materials with significantly improved structural stability for safe, long-life lithium ion batteries, as the safety of lithium-ion batteries is a critical issue; it is widely accepted that the thermal instability of the cathodes is one of the most critical factors in thermal runaway and related safety problems.展开更多
Ba0.8Sr0.2FeO3-δhas been surface-modified by the lithium-ion conductor Li1.4Al0.4Ti1.6(PO4)3via a facile mechanical fusion method. The annealing temperature during coating process shows a strong impact on the surface...Ba0.8Sr0.2FeO3-δhas been surface-modified by the lithium-ion conductor Li1.4Al0.4Ti1.6(PO4)3via a facile mechanical fusion method. The annealing temperature during coating process shows a strong impact on the surface morphology and chemical composition of Li(Ni0.6 Co0.2 Mn0.2)O2. The 600-?C annealed material exhibits the best cyclic stability at high charging cut-off voltage of 4.5 V(versus Li+/Li) with the capacity retention of 90.9% after 100 cycles, which is much higher than that of bare material(79%). Moreover, the rate capability and thermal stability are also improved by Li1.4Al0.4Ti1.6(PO4)3coating. The enhanced performance can be attributed to the improved stability of interface between Ba0.8Sr0.2FeO3-δand electrolyte by Li1.4Al0.4Ti1.6(PO4)3modification. The results of this work provide a possible method to design reliable cathode materials to achieve high energy density and long cycle life.展开更多
The effects of tungsten W doping and coating on the electrochemical performance of LiCoO2 cathode are compara- tively studied in this work. The amount of modification component is as low as 0.1 wt% and 0.3 wt% respect...The effects of tungsten W doping and coating on the electrochemical performance of LiCoO2 cathode are compara- tively studied in this work. The amount of modification component is as low as 0.1 wt% and 0.3 wt% respectively. After 100 cycles between 3.0 V-4.6 V, 0.1 wt% W doping provides an optimized capacity retention of 72.3%. However, W coating deteriorates battery performance with capacity retention of 47.8%, even lower than bare LiCoO2 of 55.7%. These different electrochemical performances can be attributed to the surface aggregation of W between doping and coating methods. W substitution is proved to be a promising method to develop high voltage cathodes. Practical performance relies on detailed synthesis method.展开更多
High chemical reactivity, large volume changes, and uncontrollable lithium dendrite growth have always been the key problems of lithium metal anodes.Coating has been demonstrated as an effective strategy to protect th...High chemical reactivity, large volume changes, and uncontrollable lithium dendrite growth have always been the key problems of lithium metal anodes.Coating has been demonstrated as an effective strategy to protect the lithium metal.In this work, the effects of polyacrylonitrile(PAN)-based coatings on electrodeposited lithium have been studied.Our results show that a PAN coating layer provides uniform and dendrite-free lithium deposition as well as better cycling performance with carbonate electrolyte.Notably, heat treatment of the PAN coating layer promotes the formation of larger deposit particle size and higher coulombic efficiency(85%).The compact coating layer of heat-treated PAN with a large Young modulus(82.7 GPa) may provide stable protection for the active lithium.Improved homogeneity of morphology and mechanical properties of heat-treated PAN contribute to the larger deposit particles.This work provides new feasibility to optimize the polymer coating through rational modification of polymers.展开更多
Silicon monoxide(SiO) has been considered as one of the most promising anode materials for next generation highenergy-density Li-ion batteries(LiBs) thanks to its high theoretical capacity. However, the poor intrinsic...Silicon monoxide(SiO) has been considered as one of the most promising anode materials for next generation highenergy-density Li-ion batteries(LiBs) thanks to its high theoretical capacity. However, the poor intrinsic electronic conductivity and large volume change during lithium intercalation/de-intercalation restrict its practical applications. Fabrication of SiO/C composites is an effective way to overcome these problems. Herein, a series of micro-sized SiO@C/graphite(Si0@C/G) composite anode materials, with designed capacity of 600 mAh·g-1, are successfully prepared through a pitch pyrolysis reaction method. The electrochemical performance of SiO@C/G composite anodes with different carbon coating contents of 5 wt%, 10 wt%, 15 wt%, and 35 wt% is investigated. The results show that the SiO@C/G composite with15-wt% carbon coating content exhibits the best cycle performance, with a high capacity retention of 90.7% at 25℃ and90.1% at 45 0 C after 100 cycles in full cells with LiNi0.5Co0.2Mn0.3O2 as cathodes. The scanning electron microscope(SEM) and electrochemistry impedance spectroscopy(EIS) results suggest that a moderate carbon coating layer can promote the formation of stable SEI film, which is favorable for maintaining good interfacial conductivity and thus enhancing the cycling stability of SiO electrode.展开更多
The dissolution of transition metal(TM)cations from oxide cathodes and the subsequent migration and deposition on the anode lead to the deconstruction of cathode materials and uncontrollable growth of solid electrode ...The dissolution of transition metal(TM)cations from oxide cathodes and the subsequent migration and deposition on the anode lead to the deconstruction of cathode materials and uncontrollable growth of solid electrode interphase(SEI).The above issues have been considered as main causes for the performance degradation of lithium-ion batteries(LIBs).In this work,we reported that the solid oxide electrolyte Li1.5Al0.5Ti1.5(PO4)3(LATP)coating on polyethylene(PE)polymer separator can largely block the TM dissolution and deposition in LIBs.Scanning electron microscopy(SEM),second ion mass spectroscopy(SIMS),and Raman spectroscopy characterizations reveal that the granular surface of the LATP coating layer is converted to a dense morphology due to the reduction of LATP at discharge process.The as-formed dense surface layer can effectively hinder the TM deposition on the anode electrode and inhibit the TM dissolution from the cathode electrode.As a result,both the LiCoO2/SiO-graphite and LiMn2O4/SiO-graphite cells using LATP coated PE separator show substantially enhanced cycle performances compared with those cells with Al2O3 coated PE separator.展开更多
During the past decades,Li-ion batteries have been one of the most important energy storage devices.Large-scale energy storage requires Li-ion batteries which possess high energy density,low cost,and high safety.Other...During the past decades,Li-ion batteries have been one of the most important energy storage devices.Large-scale energy storage requires Li-ion batteries which possess high energy density,low cost,and high safety.Other than advanced battery materials,in-depth understanding of the intrinsic mechanism correlated with cell reaction is also essential for the development of high-performance Li-ion battery.Advanced characterization techniques,especially neutron-based techniques,have greatly promoted Li-ion battery researches.In this review,the characteristics or capabilities of various neutron-based characterization techniques,including elastic neutron scattering,quasi-elastic neutron scattering,neutron imaging,and inelastic neutron scattering,for the related Li-ion-battery researches are summarized.The design of in-situ/operando environment is also discussed.The comprehensive survey on neutron-based characterizations for mechanism understanding will provide guidance for the further study of high-performance Li-ion batteries.展开更多
The rapid development of lithium-ion batteries(LIBs)is faced with challenge of its safety bottleneck,calling for design and chemistry innovations.Among the proposed strategies,the development of solid-state batteries(...The rapid development of lithium-ion batteries(LIBs)is faced with challenge of its safety bottleneck,calling for design and chemistry innovations.Among the proposed strategies,the development of solid-state batteries(SSBs)seems the most promising solution,but to date no practical SSB has been in large-scale application.Practical safety performance of SSBs is also challenged.In this article,a brief review on LIB safety issue is made and the safety short boards of LIBs are emphasized.A systematic safety design in quasi-SSB chemistry is proposed to conquer the intrinsic safety weak points of LIBs and the effects are accessed based on existing studies.It is believed that a systematic and targeted solution in SSB chemistry design can effectively improve the battery safety,promoting larger-scale application of LIBs.展开更多
基金Project supported by the Natural Science Foundation of Beijing(Grant No.Z200013)the Beijing Municipal Science&Technology(Grant No.Z191100004719001)the National Natural Science Foundation of China(Grant Nos.52325207 and 22005333)。
文摘Li/Ni mixing negatively influences the discharge capacity of lithium nickel oxide and high-nickel ternary cathode materials.However,accurately measuring the Li/Ni mixing degree is difficult due to the preferred orientation of labbased XRD measurements using Bragg–Brentano geometry.Here,we find that employing spherical harmonics in Rietveld refinement to eliminate the preferred orientation can significantly decrease the measurement error of the Li/Ni mixing ratio.The Li/Ni mixing ratio obtained from Rietveld refinement with spherical harmonics shows a strong correlation with discharge capacity,which means the electrochemical capacity of lithium nickel oxide and high-nickel ternary cathode can be estimated by the Li/Ni mixing degree.Our findings provide a simple and accurate method to estimate the Li/Ni mixing degree,which is valuable to the structural analysis and screening of the synthesis conditions of lithium nickel oxide and high-nickel ternary cathode materials.
基金supported by funding from the Strategic Research and Consulting Project of the Chinese Academy of Engineering(2022-XZ-15)。
文摘1.Introduction To date,the application of lithium-ion batteries(LIBs)has been expanded from traditional consumer electronics to electric vehicles(EVs),energy storage,special fields,and other application scenarios.The production capacity of LIBs is increasing rapidly,from 26 GW·h in 2011 to 747 GW·h in 2020,76% of which comes from China[1].
文摘能源危机和环境问题制约着社会发展与人类进步,新型可再生清洁能源的开发利用是解决能源危机和环境问题行之有效的途径,先进储能技术在可再生清洁能源的开发利用过程中具有至关重要的作用。基于储能技术发展的重要性,文章简略介绍了各种先进储能技术,并结合Web of Science搜索引擎,从科技论文发表的年份、国家/地区、机构和专利等角度,对各种先进储能技术进行了文献检索统计,分析其发展趋势。在众多的储能技术中,锂离子电池、超级电容器、钠离子电池、飞轮、超导磁储存、固态电池等基础研究方向比较活跃;锂离子电池、飞轮、超级电容器、压缩空气储能、铅酸电池等则在技术开发方向比较突出。
基金supported by the National Key Research and Development Program of China (Grant No.2021YFB2500300)the National Natural Science Foundation of China (Grant No.22239003)+1 种基金the CAS Project for Young Scientists in Basic Research(Grant No.YSBR-058)the Strategic Research and Consulting Project of the Chinese Academy of Engineering(Grant No.2022-XZ-15)。
文摘High-energy-density rechargeable lithium batteries are being pursued by researchers because of their revolutionary potential nature.Current advanced practical lithium-ion batteries have an energy density of around300 W·h·kg^(-1).Continuing to increase the energy density of batteries to a higher level could lead to a major explosion development in some fields,such as electric aviation.Here,we have manufactured practical pouch-type rechargeable lithium batteries with both a gravimetric energy density of 711.3 W·h·kg^(-1)and a volumetric energy density of 1653.65 W·h·L^(-1).This is achieved through the use of high-performance battery materials including high-capacity lithium-rich manganese-based cathode and thin lithium metal anode with high specific energy,combined with extremely advanced process technologies such as high-loading electrode preparation and lean electrolyte injection.In this battery material system,the structural stability of cathode material in a widened charge/discharge voltage range and the deposition/dissolution behavior of interfacial modified thin lithium electrode are studied.
基金supported by the U.S.Department of Energy,the Assistant Secretary for Energy Efficiency and Renewable Energy,Office of Vehicle Technologies(Grant No.DE-SC0012704)
文摘Structural transformation behaviors of several typical oxide cathode materials during a heating process are reviewed in detail to provide in-depth understanding of the key factors governing the thermal stability of these materials. We also discuss applying the information about beat induced structural evolution in the study of electrochemically induced structural changes. All these discussions are expected to provide valuable insights for designing oxide cathode materials with significantly improved structural stability for safe, long-life lithium ion batteries, as the safety of lithium-ion batteries is a critical issue; it is widely accepted that the thermal instability of the cathodes is one of the most critical factors in thermal runaway and related safety problems.
基金Project supported by the National Key Research and Development Program of China(Grant No.2017YFB0102004)the National Natural Science Foundation of China(Grant No.51822211)the State Grid Technology Project,China(Grant No.DG71-17-010)
文摘Ba0.8Sr0.2FeO3-δhas been surface-modified by the lithium-ion conductor Li1.4Al0.4Ti1.6(PO4)3via a facile mechanical fusion method. The annealing temperature during coating process shows a strong impact on the surface morphology and chemical composition of Li(Ni0.6 Co0.2 Mn0.2)O2. The 600-?C annealed material exhibits the best cyclic stability at high charging cut-off voltage of 4.5 V(versus Li+/Li) with the capacity retention of 90.9% after 100 cycles, which is much higher than that of bare material(79%). Moreover, the rate capability and thermal stability are also improved by Li1.4Al0.4Ti1.6(PO4)3coating. The enhanced performance can be attributed to the improved stability of interface between Ba0.8Sr0.2FeO3-δand electrolyte by Li1.4Al0.4Ti1.6(PO4)3modification. The results of this work provide a possible method to design reliable cathode materials to achieve high energy density and long cycle life.
基金Project supported by the National Key Rerearch and Development Program of China(Grant No.2017YFB0102004)the National Natural Science Foundation of China(Grant No.51502334)+1 种基金the Fund from Beijing Municipal Science&Technology Commission,China(Grant No.D171100005517001)the Thousand Talent Program for Outstanding Young Scientists,China
文摘The effects of tungsten W doping and coating on the electrochemical performance of LiCoO2 cathode are compara- tively studied in this work. The amount of modification component is as low as 0.1 wt% and 0.3 wt% respectively. After 100 cycles between 3.0 V-4.6 V, 0.1 wt% W doping provides an optimized capacity retention of 72.3%. However, W coating deteriorates battery performance with capacity retention of 47.8%, even lower than bare LiCoO2 of 55.7%. These different electrochemical performances can be attributed to the surface aggregation of W between doping and coating methods. W substitution is proved to be a promising method to develop high voltage cathodes. Practical performance relies on detailed synthesis method.
基金Project supported by the National Natural Science Foundation of China(Grant Nos.51822211 and 51802342)the State Grid Technology Project,China(Grant No.DG71-17-010)
文摘High chemical reactivity, large volume changes, and uncontrollable lithium dendrite growth have always been the key problems of lithium metal anodes.Coating has been demonstrated as an effective strategy to protect the lithium metal.In this work, the effects of polyacrylonitrile(PAN)-based coatings on electrodeposited lithium have been studied.Our results show that a PAN coating layer provides uniform and dendrite-free lithium deposition as well as better cycling performance with carbonate electrolyte.Notably, heat treatment of the PAN coating layer promotes the formation of larger deposit particle size and higher coulombic efficiency(85%).The compact coating layer of heat-treated PAN with a large Young modulus(82.7 GPa) may provide stable protection for the active lithium.Improved homogeneity of morphology and mechanical properties of heat-treated PAN contribute to the larger deposit particles.This work provides new feasibility to optimize the polymer coating through rational modification of polymers.
基金Project supported by the State Grid Technology Project,China(study on the mechanism and characterization of lithium dendrite growth in lithium ion batteries,Project No.DG71-17-010)the National Key Research and Development Program of China(Grant No.2017YFB0102004)the National Natural Science Foundation of China(Grant No.51822211)
文摘Silicon monoxide(SiO) has been considered as one of the most promising anode materials for next generation highenergy-density Li-ion batteries(LiBs) thanks to its high theoretical capacity. However, the poor intrinsic electronic conductivity and large volume change during lithium intercalation/de-intercalation restrict its practical applications. Fabrication of SiO/C composites is an effective way to overcome these problems. Herein, a series of micro-sized SiO@C/graphite(Si0@C/G) composite anode materials, with designed capacity of 600 mAh·g-1, are successfully prepared through a pitch pyrolysis reaction method. The electrochemical performance of SiO@C/G composite anodes with different carbon coating contents of 5 wt%, 10 wt%, 15 wt%, and 35 wt% is investigated. The results show that the SiO@C/G composite with15-wt% carbon coating content exhibits the best cycle performance, with a high capacity retention of 90.7% at 25℃ and90.1% at 45 0 C after 100 cycles in full cells with LiNi0.5Co0.2Mn0.3O2 as cathodes. The scanning electron microscope(SEM) and electrochemistry impedance spectroscopy(EIS) results suggest that a moderate carbon coating layer can promote the formation of stable SEI film, which is favorable for maintaining good interfacial conductivity and thus enhancing the cycling stability of SiO electrode.
基金the National Key R&D Program of China(Grant No.2016YFB0100100)the National Natural Science Foundation of China(Grant Nos.51822211,U1932220,U1964205,and U19A2018).
文摘The dissolution of transition metal(TM)cations from oxide cathodes and the subsequent migration and deposition on the anode lead to the deconstruction of cathode materials and uncontrollable growth of solid electrode interphase(SEI).The above issues have been considered as main causes for the performance degradation of lithium-ion batteries(LIBs).In this work,we reported that the solid oxide electrolyte Li1.5Al0.5Ti1.5(PO4)3(LATP)coating on polyethylene(PE)polymer separator can largely block the TM dissolution and deposition in LIBs.Scanning electron microscopy(SEM),second ion mass spectroscopy(SIMS),and Raman spectroscopy characterizations reveal that the granular surface of the LATP coating layer is converted to a dense morphology due to the reduction of LATP at discharge process.The as-formed dense surface layer can effectively hinder the TM deposition on the anode electrode and inhibit the TM dissolution from the cathode electrode.As a result,both the LiCoO2/SiO-graphite and LiMn2O4/SiO-graphite cells using LATP coated PE separator show substantially enhanced cycle performances compared with those cells with Al2O3 coated PE separator.
基金Project supported by the National Key R&D Program of China(Grant No.2016YFA0401503)the National Materials Genome Project of China(Grant No.2016YFB0100106)the National Natural Science Foundation of China(Grant No.11675255)
文摘During the past decades,Li-ion batteries have been one of the most important energy storage devices.Large-scale energy storage requires Li-ion batteries which possess high energy density,low cost,and high safety.Other than advanced battery materials,in-depth understanding of the intrinsic mechanism correlated with cell reaction is also essential for the development of high-performance Li-ion battery.Advanced characterization techniques,especially neutron-based techniques,have greatly promoted Li-ion battery researches.In this review,the characteristics or capabilities of various neutron-based characterization techniques,including elastic neutron scattering,quasi-elastic neutron scattering,neutron imaging,and inelastic neutron scattering,for the related Li-ion-battery researches are summarized.The design of in-situ/operando environment is also discussed.The comprehensive survey on neutron-based characterizations for mechanism understanding will provide guidance for the further study of high-performance Li-ion batteries.
基金Project supported by the National Key Research and Development Program of China(Grant No.2021YFB2500300)。
文摘The rapid development of lithium-ion batteries(LIBs)is faced with challenge of its safety bottleneck,calling for design and chemistry innovations.Among the proposed strategies,the development of solid-state batteries(SSBs)seems the most promising solution,but to date no practical SSB has been in large-scale application.Practical safety performance of SSBs is also challenged.In this article,a brief review on LIB safety issue is made and the safety short boards of LIBs are emphasized.A systematic safety design in quasi-SSB chemistry is proposed to conquer the intrinsic safety weak points of LIBs and the effects are accessed based on existing studies.It is believed that a systematic and targeted solution in SSB chemistry design can effectively improve the battery safety,promoting larger-scale application of LIBs.