微型锂电池LiMn_2O_4正极薄膜掺杂改性研究

Research Progress on the Doping Modification of LiMn_2O_4 Thin Films as Cathode Materials of Micro Lithium Battery

LiMn2O4薄膜正极材料因具备工作电压高、安全性能好、对环境友好、成本低等优点成为全固态薄膜锂电池领域近年来研究的热点。然而,较差的循环性能制约着其作为锂电池正极材料的进一步应用。大量研究表明,金属元素掺杂可明显提高LiMn2O4薄膜的循环稳定性,受到国内外学者的重视。简要分析了尖晶石LiMn2O4薄膜容量衰减的主要原因,着重评述了近年来金属元素掺杂对其改性研究进展。

LiMn2O4 film is a promising cathode material used in all-solid-state thin-film lithium battery for its high potential, good safety performance, low cost and nontoxicity. However, poor cycle stability is the most important factor to prevent its further applications. Doping a few metal elements in LiMn2 O4 film will markedly improve its structure stability and cycling performance, which attracts much attention recently. In this paper, the capacity loss mechanism of spinel LiMn2O4 film is analyzed and the modification by doping metal elements in recent years is reviewed.