Boosting cycling stability by regulating surface oxygen vacancies of LNMO by rapid calcination  

作　　者：Haoran Jiang Cuihua Zeng Wei Zhu Jiawei Luo Zhedong Liu Jingchao Zhang Rui Liu Yunhua Xu Yanan Chen Wenbin Hu 

机构地区：[1]School of Materials Science and Engineering,Tianjin University,Tianjin 300072,China [2]School of Materials Science and Engineering,Shandong University of Science and Technology,Qingdao 266590,China

出　　处：《Nano Research》2024年第4期2671-2677,共7页纳米研究（英文版）

基　　金：support from the National Natural Science Foundation of China(No.52171219).

摘　　要：Spinel LiNi_(0.5-x)Mn_(1.5+x)O_(4)(LNMO)has attracted intensive interest for lithium-ion battery due to its high voltage and high energy density.However,severe capacity fade attributed to unstable surface structure has hampered its commercialization.Oxygen vacancies(OVs)tend to occur in the surface of the material and lead to surface structure reconstruction,which deteriorates the battery performance during electrochemical cycling.Here,we utilize high-temperature-shock(HTS)method to synthesize LNMO materials with fewer surface OVs.Rapid calcination drives lower surface OVs concentration,reducing the content of Mn^(3+)and surface reconstruction layers,which is beneficial to obtain a stable crystal structure.The LNMO material synthesized by HTS method delivers an initial capacity of 127 mAh·g^(-1) at 0.1 C and capacity retention of 81.6%after 300 cycles at 1 C,and exhibits excellent performance at low temperature.

关 键 词：ultrafast synthesis oxygen vacancy LiNi_(0.5-x)Mn_(1.5+x)O_(4)(LNMO)cathode high-temperature-shock lithium-ion batteries 

分 类 号：TB383[一般工业技术—材料科学与工程]