Improving the stability of LiNi_(0.80)Co_(0.15)Al_(0.05)O_2 by AlPO_4 nanocoating for lithium-ion batteries  

作　　者：Ran Qi Ji-Lei Shi Xu-Dong Zhang Xian-Xiang Zeng Ya-Xia Yin Jian Xu Li Chen Wei-Gui Fu Yu-Guo Guo Li-Jun Wan 

机构地区：[1]State Key Laboratory of Separation Membranes and Membrane Processes,School of Materials Science and Engineering,Tt'anjin Polytechnic University,Tianjin 300071,China [2]CAS Research/Education Center for Excellence in Molecular Sciences,Institute of Chemistry,Chinese Academy of Sciences,Beo'ing 100190,China [3]School of Chemistry and Chemical Engineering,University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Science China Chemistry》2017年第9期1230-1235,共6页中国科学（化学英文版）

基　　金：supported by the National Natural Science Foundation of China(21303222,21127901,51303132);the National Key Research and Development Program of China(2016YFA0202500);the'Strategic Priority Research Program'of the Chinese Academy of Sciences(XDA09010100)

摘　　要：Nickel-rich layered materials,such as LiNi_(0.8)0Co_(0.15)Al_(0.05)O_2(NCA),have been considered as one alternative cathode materials for lithium-ion batteries(LIBs) due to their high capacity and low cost.However,their poor cycle life and low thermal stability,caused by the electrode/electrolyte side reaction,prohibit their prosperity in practical application.Herein,AlPO4 has been homogeneously coated on the surface of NCA via wet chemical method towards the target of protecting NCA from the attack of electrolyte.Compared with the bare NCA,NCA@AlPO_4 electrode delivers high capacity without sacrificing the discharge capacity and excellent cycling stability.After 150 cycles at 0.5 C between 3.0-4.3 V,the capacity retention of the coated material is 86.9%,much higher than that of bare NCA(66.8%).Furthermore,the thermal stability of cathode is much improved due to the protection of the uniform coating layer on the surface of NCA.These results suggest that AlPO4 coated NCA materials could act as one promising candidate for next-generation LIBs with high energy density in the near future.Nickel-rich layered materials, such as LiNi0.80Co0.15Al0.05O2 (NCA), have been considered as one alternative cathode materials for lithium-ion batteries (LIBs) due to their high capacity and low cost. However, their poor cycle life and low thermal stability, caused by the electrode/electrolyte side reaction, prohibit their prosperity in practical application. Herein, AlPO4 has been homogeneously coated on the surface of NCA via wet chemical method towards the target of protecting NCA from the attack of electrolyte. Compared with the bare NCA, NCA@AlPO4 electrode delivers high capacity without sacrificing the discharge capacity and excellent cycling stability. After 150 cycles at 0.5 C between 3.0-4.3 V, the capacity retention of the coated material is 86.9%, much higher than that of bare NCA (66.8%). Furthermore, the thermal stability of cathode is much improved due to the protection of the uniform coating layer on the surface of NCA. These results suggest that AlPO4 coated NCA materials could act as one promising candidate for next-generation LIBs with high energy density in the near future.

关 键 词：Li-ion batteries cathode materials surface modification AlPO4 coating 

分 类 号：TM912[电气工程—电力电子与电力传动]