摘要
尖晶石锰酸锂(LiMn_(2)O_(4))具有理论比容量高、热稳定性高、价格低廉、循环性能良好等特点,深受研究者的亲睐,目前已有固相法、燃烧合成法和共沉淀等多种制备方法。为了进一步改善该材料的循环性能,研究者提出了元素掺杂的策略,元素掺杂改性是基于改变材料的晶体结构或材料中部分元素的平均价态来提高材料的电化学性能和结构的稳定性。Si^(4+)掺杂可以取代材料中的部分Mn^(4+),从而使材料产生Jahn-Teller效应的离子数降低和尖晶石锰酸锂的八面体体积扩大,提高电化学性能。为此,综述了近几年来单一硅元素掺杂及硅与其他元素复合掺杂改性尖晶石型锰酸锂正极材料的研究进展。
Spinel lithium manganate(LiMn_(2)O_(4))was favored by researchers due to its high theoretical specific capacity,good thermal stability,low cost and excellent cycle performance.Various methods such as solid-state,combustion synthesis and co-precipitation method have been proposed to prepare it.Element-doping is considered to be an excellent strategy to further improve the cycle performance of the spinel LiMn_(2)O_(4) because it is based on changing the crystal structure or the some elements average valence state of the material to improve the electrochemical performance and structural stability.Si^(4+)doping can effectively improve the electrochemical performance of LiMn_(2)O_(4) by substituting part of the Mn^(4+)to reduce the ions number of the Jahn-Teller effect,and expanded the volume of the spinel octahedron.Therefore,the research progress of single or composite Si-doped and modified the spinel LiMn_(2)O_(4) cathode materials in recent years was reviewed.
作者
陈锐芳
温碧霞
苏长伟
郭俊明
Chen Ruifang;Wen Bixia;Su Changwei;Guo Junming(College of Chemistry and Environment,Yunnan Minzu University,Kunming 650500;College of Materials and Chemical Engineering,Hunan Institute of Engineering,Xiangtan 411104)
出处
《化工新型材料》
CAS
CSCD
北大核心
2021年第3期53-58,共6页
New Chemical Materials
基金
国家自然科学基金(51561032、U1602273)。
关键词
锂离子电池
尖晶石型锰酸锂
硅掺杂
研究进展
Lithium-ion battery
spinel lithium manganate
Si-doping
research progress
