Tuning the phase evolution pathway of LiNi_(0.5)Mn_(1.5)O_(4) synthesis from binary intermediates to ternary intermediates with thermal regulating agent  

作　　者：Libin Wu Hua Huo Qun Wang Xucai Yin Shu Guo Jiajun Wang Chunyu Du Pengjian Zuo Geping Yin Yunzhi Gao 

机构地区：[1]Key Laboratory of Materials for New Energy Conversion and Storage(Ministry of Industry and Information Technology),School of Chemistry and Chemical Engineering,Harbin Institute of Technology,Harbin 150001,Heilongjiang,China [2]Center of Analysis and Measurement,Harbin Institute of Technology,Harbin 150001,Heilongjiang,China

出　　处：《Journal of Energy Chemistry》2022年第2期62-70,共9页能源化学（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Grant No.21673065 and 21875057);the Key-Area Research and Development Program of Guangdong Province(No.1934212200002);the Innovation and Entrepreneurship Team Project of Zhuhai(No.ZH01110405170016PWC)。

摘　　要：Transition metal cation ordering is essential for controlling the electrochemical performance of cubic spinel LiNi_(0.5)Mn_(1.5)O_(4)(LNMO),which is conventionally adjusted by optimizing the high temperature sintering and annealing procedures.In this present work,multiple characterization techniques,including 6,7Li NMR,XRD and HRTEM,have been combined to trace the phase transformation and morphology evolution during synthesis.It has been illustrated that simultaneous formation of LiMn_(2)O_(4)(LMO)and LiNiO_(2)(LNO)binary oxides and their conversion into highly reactive LixNi^(3+)_(y)Mn_(3.5+)_(z)O ternary intermediate is a thermal dynamically difficult but crucial step in the synthesis of LNMO ternary oxide.A new strategy of modifying the intermediates formation pathway from binary mode to ternary mode using thermal regulating agent has been adopted.LNMO synthesized with thermal regulating agent exhibits supreme rate capability,long-cycling performance(even at elevated temperature)and excellent capacity efficiency.At a high rate of 100 C,the assembled battery delivers a discharge capacity of 99 mAh g^(-1).This study provides a way to control the formation pathway of complex oxides using thermal regulating agent.

关 键 词：Cation ordering LiNi_(0.5)Mn_(1.5)O_(4) Lithium ion batteries Synthesis of ternary oxide Thermal regulation 

分 类 号：TQ131.11[化学工程—无机化工] TM912[电气工程—电力电子与电力传动]