Precision engineering of high-performance Ni-rich layered cathodes with radially aligned microstructure through architectural regulation of precursors  

作　　者：Xin Zhou FeiFei Hong Shuo Wang Tian Zhao Jiali Peng Bin Zhang Weifeng Fan Wangyan Xing Meihua Zuo Ping Zhang Yuhuan Zhou Genpin Lv Yanjun Zhong Weibo Hua Wei Xiang 

机构地区：[1]School of Chemical Engineering,Sichuan University,Chengdu 610065,China [2]College of Materials and Chemistry&Chemical Engineering Chengdu University of Technology,Chengdu 610059,China [3]Yibin Tianyuan Group Co Ltd.,Yibin 644000,China [4]School of Chemical Engineering and Technology,Xi'an Jiaotong University,Xi'an 710049,China [5]Institute for Applied Materials(IAM),Karlsruhe Institute of Technology(KIT),Hermann-von-Helmholtz-Platz 1,D-76344 Eggenstein-Leopoldshafen,Germany [6]Ruyuan HEC New Energy Materials Co.,Ltd.,Ruyuan 512700,China [7]Tianfu Yongxing Laboratory,Chengdu 610213,China

出　　处：《eScience》2024年第6期96-107,共12页电化学与能源科学(英文)

基　　金：supported by project from the National Natural Science Foundation of China(21805018,22108218);by the Sichuan Science and Technology Program(2022ZHCG0018,2023NSFSC0117,2023ZHCG0060);the Yibin Science and Technology Program(2022JB005);project funded by the China Postdoctoral Science Foundation(2022M722704).

摘　　要：Microstructure engineering serves as a potent approach to counteract the mechanical deterioration of Ni-rich layered cathodes,stemming from anisotropic strain during Lit(de)intercalation.However,a pressing challenge persists in devising a direct method for fabricating radially aligned cathodes utilizing oriented hydroxide precursors.In this study,we synthesized LiNi_(0.92)Co_(0.04)Mn_(0.04)O_(2) oxides boasting superior radially aligned,sizerefined primary particles through a combination of strategic precipitation regulation and lithiation tuning.Elongated primary particles,achieved by stepwise control of ammonia concentration and pH during particle growth,facilitate the formation of radially aligned hydroxide precursor particles.Leveraging the size-refined and radially aligned primary particles,our prepared LiNi_(0.92)Co_(0.04)Mn_(0.04)O_(2) cathode exhibits a high discharge capacity of 229 mAh g^(-1) at 0.05 C,alongside excellent cycle stability,retaining 93.3% capacity after 200 cycles at 0.5 C(30℃)in a half cell,and 86.4% capacity after 1000 cycles at 1 C(30℃)in a full cell.Revisiting the regulation from precursor to oxide underscores the significance of controlling primary particles to maximize size perpendicular to[001]and attain suitable size along[001]during precursor precipitation and high-temperature calcination,offering valuable insights for synthesizing high-performance Ni-rich cathodes.

关 键 词：Ni-rich cathodes MICROCRACKS Radially aligned microstructure Hydroxide precursor CO-PRECIPITATION 

分 类 号：O61[理学—无机化学]