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Elucidation of the sodium kinetics in layered P-type oxide cathodes 被引量:5
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作者 Lianzheng Yu Haojie Dong +9 位作者 Yu-Xin Chang Zhiwei Cheng Kang xu Yi-Hu Feng Duo Si xu Zhu Mengting Liu Bing Xiao Peng-Fei Wang sailong xu 《Science China Chemistry》 SCIE EI CAS CSCD 2022年第10期2005-2014,共10页
Sodium-ion intercalation oxides generally possess high compositional diversity according to their different stacking sequences.The sodium diffusion pathway in layered P-type materials used in sodium-ion batteries is o... Sodium-ion intercalation oxides generally possess high compositional diversity according to their different stacking sequences.The sodium diffusion pathway in layered P-type materials used in sodium-ion batteries is open,which can increase their rate capability by directly transmitting Na+between adjacent triangular prismatic channels,rather than passing through an intermediate tetrahedral site in O-type structure.However,how the structure chemistry of the P-type oxides determines their electrochemical properties has not been fully understood yet.Herein,by comparing the crystalline structures,electrochemical behaviors,ion/electron transport dynamics of a couple of P-type intercalation cathodes,P2-Na_(2/3)Ni1/3Mn_(2/3)O_(2)and P3-Na_(2/3)Ni_(1/3)Mn_(2/3)O_(2)with the same compositions,we demonstrate experimentally and computationally that the P2 phase delivers better cycling stability and rate capability than the P3 counterpart due to the predominant contribution of the faster intrinsic Na diffusion kinetics in the P2 bulk.We also point out that it is the electronic conductivity that captures the key electrochemistry of layered P3-type materials and makes them possible to enhance the sodium storage performance.The results reveal that the correlation between stacking structure and functional properties in two typical layered P-type cathodes,providing new guidelines for preparing and designing alkali-metal layered oxide materials with improved battery performance. 展开更多
关键词 sodium-ion batteries cathode P2 phase P3 phase KINETICS
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Exchange-Biased NiFe_(2)O_(4)/NiO Nanocomposites Derived from NiFe-Layered Double Hydroxides as a Single Precursor 被引量:4
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作者 Xiaofei Zhao sailong xu +2 位作者 Lianying Wang xue Duan Fazhi Zhang 《Nano Research》 SCIE EI CSCD 2010年第3期200-210,共11页
NiFe_(2)O_(4) nanoparticles(<10 nm)embedded in a NiO matrix have been fabricated by calcining the corresponding Ni^(Ⅱ)Fe^(Ⅲ)-layered double hydroxide(LDH)precursors at high temperature(500℃).Compared with the Ni... NiFe_(2)O_(4) nanoparticles(<10 nm)embedded in a NiO matrix have been fabricated by calcining the corresponding Ni^(Ⅱ)Fe^(Ⅲ)-layered double hydroxide(LDH)precursors at high temperature(500℃).Compared with the NiFe_(2)O_(4)/NiO nanocomposite obtained by calcination of a precursor prepared by a traditional chemical coprecipitation method,those derived from NiFe-LDH precursors show much higher blocking temperatures(TB)(~380 K).The enhanced magnetic stability can be ascribed to the much stronger interfacial interaction between NiFe_(2)O_(4) and NiO phases due to the topotactic nature of the transformation of the LDH precursor to the NiFe_(2)O_(4)/NiO composite material.Through tuning the Ni^(Ⅱ)/Fe^(Ⅲ) molar ratio of the NiFe-LDH precursor,the NiFe_(2)O_(4) concentration can be precisely controlled,and the TB value as well as the magnetic properties of the final material can also be regulated.This work represents a successful example of the fabrication of ferro(ferri)magnetic(FM)/antiferrimagnetic(AFM)systems with high magnetic stability from LDH precursors.This method is general and may be readily extended to other FM/AFM systems due to the wide range of available LDH precursors. 展开更多
关键词 Layered double hydroxide topotactic mechanism interfacial interaction exchange bias magnetic stability
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Effect of alkyl substitutions on self-assembly 被引量:1
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作者 Peng Wu Guojun Deng +4 位作者 sailong xu Qinghua Fan Lijun Wan Chen Wang Chunli Bai 《Chinese Science Bulletin》 SCIE EI CAS 2002年第18期1514-1517,共4页
The self-assemblies of 4-hexadecyloxybenzoic acid and 3,4,5-trihexadecyloxybenzoic acid have been studied by using scanning tunneling microscopy (STM). The well-ordered assemblies with different arrangement have been ... The self-assemblies of 4-hexadecyloxybenzoic acid and 3,4,5-trihexadecyloxybenzoic acid have been studied by using scanning tunneling microscopy (STM). The well-ordered assemblies with different arrangement have been investigated. The structural change is attributed to the different number of substituted alkyl chains on periphery. 展开更多
关键词 scanning TUNNELING MICROSCOPY (STM) SELF-ASSEMBLY ALKYL substitutions.
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Controllable magnetic properties of cobalt ferrite particles derived from layered double hydroxide precursors 被引量:1
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作者 Yonglian Qi Yingsheng Yang +4 位作者 Xiaofei Zhao Xilan Liu Peng Wu Fazhi Zhang sailong xu 《Particuology》 SCIE EI CAS CSCD 2010年第3期207-211,共5页
Cobalt ferrite CoxNi1-xFe2O4 (x = 0, 0.5, 1 ) particles with controllable magnetic properties have been prepared by calcination of co-substituted NiFe^2+Fe^3+ -layered double hydroxide (NiFe^2+Fe^3+-LDH) precu... Cobalt ferrite CoxNi1-xFe2O4 (x = 0, 0.5, 1 ) particles with controllable magnetic properties have been prepared by calcination of co-substituted NiFe^2+Fe^3+ -layered double hydroxide (NiFe^2+Fe^3+-LDH) precursors prepared via a scalable method involving separate nucleation and aging steps (SNAS). Their structural and magnetic characteristics were investigated by powder X-ray diffraction (XRD), scanning electron microscopy (SEM) and vibrating sample magnetometry (VSM). Measurements of magnetic properties show that the saturation magnetization (Ms) and coercivity (He) of the calcined products increased with increasing cobalt content. The LDH precursor-based product obtained by calcination of a mixture of CoFe^2+Fe3^+-LDH and NiFe^2+Fe^3+ -LDH powders with a Co/Ni molar ratio of 1:1, exhibits a moderate value of Ms and an increased value of He compared to the corresponding values for an Ni0.5Co0.5Fe2O4 material prepared by calcination of a Co0.5Ni0.5Fe^2+Fe^3+-LDH precursor, and a physical mixture of CoFe2O4 and NiFe2O4 with a Co/Ni molar ratio of 1 : 1. These results may provide a way to regulate magnetic anisotropy of ferrite spinels by varying the composition of the LDH precursors. 展开更多
关键词 Layered double hydroxide precursor Cobalt ferrite Separate nucleation and aging steps Magnetic properties
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