Critical rate capability barrier by the(001)microtexture of a singlecrystal cathode for long lifetime lithium-ion batteries  

作　　者：Xiaopei Zhu Lina Cheng Han Yu Feifei Xu Wei Wei Li-Zhen Fan 

机构地区：[1]Key Laboratory of New Energy Materials and Technologies,Institute of Advanced Materials and Technology,University of Science and Technology Beijing,Beijing,100083,China [2]Tianjin Guoan Mengguli New Materials Science&Technology Limit Corporation,Tianjin,301811,China [3]CITIC Guoan Mengguli Power Sources Technology Limit Corporation,Beijing,102200,China

出　　处：《Journal of Materiomics》2022年第3期649-655,共7页无机材料学学报（英文）

基　　金：Financial supports from National Natural Science Foundation of China(51872027);Beijing Natural Science Foundation(Z200011)are gratefully acknowledged.

摘　　要：In practical pouch cell,LiNi0.5Mn0.3Co0.2O2/artificial graphite lithium ion battery using single-crystal LiNi0.5Mn0.3Co0.2O2(S-NMC532)as cathode can have excellent cycle performance.However,singlecrystal LiNi0.5Mn0.3Co0.2O2 inevitably suffers poor rate capability compared to the polycrystalline materials.Here,we systematically studied the relationship between microstructural characteristics and the practical rate performance,as well as explored the impedance change during the cycling process in the pouch cell.This work shows that the(001)plane microtexture of the electrode surface structure is a critical barrier for rate capability.Electron backscatter diffraction(EBSD),electrochemical impedance spectroscopy(EIS)and distribution of relaxation times(DRT)are conducted on the cathodes.These analyses allow to conclude on the influence of the(001)plane microtexture on the electrode surface,which illustrates a diffusion resistance of lithium ions,and then,leading a high interfacial resistance.Thus,this work confirms the main cause of the inferior rate capability of S-NMC532 and offers guidance for developing a battery with high rate and ultralong cycling life.

关 键 词：Lithium-ion batteries SINGLE-CRYSTAL Failure mechanism Crystal orientation MICROTEXTURE 

分 类 号：TM912[电气工程—电力电子与电力传动]