Decoding Li^(+)/H^(+)ion exchange route toward low-temperature synthesis of layered oxide cathode materials for lithium-ion batteries  

作　　者：Pei-Yao Li Ying-De Huang Yu-Hong Luo Han-Xin Wei Rui Luo Lin-Bo Tang He-Zhang Chen Xia-Hui Zhang Jun-Chao Zheng 

机构地区：[1]School of Metallurgy and Environment,Central South University,Changsha,410083,China [2]School of Chemistry and Chemical Engineering,Hunan University of Science and Technology,Xiangtan,411201,China

出　　处：《Rare Metals》2024年第12期6329-6339,共11页稀有金属(英文版)

基　　金：financially supported by the National Natural Science Foundation of China(No.51974368);supported by the Beamlines MCD-A and MCD-B(Soochow Beamline for Energy Materials)at NSRL。

摘　　要：The synthesis of layered oxide cathode materials by the traditional high-temperature ceramic method usually requires calcination and annealing at temperatures in the range of 700-1000℃,with high energy consumption and serious cation mixing problems.Herein,we present a novel hydrothermalLi^(+)/H^(+)exchange method for the preparation of layered oxide cathodes at temperatures as low as 200℃.In contrast to the widely reported Li^(+)/Na^(+)exchange method using sodium-containing:precursors,layered oxide cathodes can be directly synthesized by hydrothermal reaction between commercial hydroxide precursors and LiOH·H2O.The reaction pathway consists of two steps.(1)The hydroxyl oxide intermediate is obtained by oxidizing the hydroxide precursor.(2)The layered oxide product is obtained by theLi^(+)/H^(+)exchange reaction of the hydroxyl oxide with Li+in solution.Through studying the time-resolved structural evolution,we reveal that the mechanism of material formation duringLi^(+)/H^(+)ion exchange is in situ crystallization,and the ion exchange process is accompanied by lattice distortion caused by internal diffusion of ions.These findings not only provide valuable insights into theLi^(+)/H^(+)exchange process,but also provide a new paradigm for the lowtemperature synthesis of advanced cathode materials.

关 键 词：Lithium-ion battery Cathode materials Ion exchange 

分 类 号：O62[理学—有机化学]