Enhancing Lithium Manganese Oxide Electrochemical Behavior by Doping and Surface Modifications

Alexandru-Horațiu Mărincaş, P. Ilea
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引用次数: 12

Abstract

Lithium manganese oxide is regarded as a capable cathode material for lithium-ion batteries, but it suffers from relative low conductivity, manganese dissolution in electrolyte and structural distortion from cubic to tetragonal during elevated temperature tests. This review covers a comprehensive study about the main directions taken into consideration to supress the drawbacks of lithium manganese oxide: structure doping and surface modification by coating. Regarding the doping of LiMn2O4, several perspectives are studied, which include doping with single or multiple cations, only anions and combined doping with cations and anions. Surface modification approach consists in coating with different materials like carbonaceous compounds, oxides, phosphates and solid electrolyte solutions. The modified lithium manganese oxide performs better than pristine samples, showing improved cyclability, better behaviour at high discharge c-rates and elevated temperate and improves lithium ions diffusion coefficient.
通过掺杂和表面改性增强锰酸锂的电化学行为
锂锰氧化物被认为是锂离子电池的一种性能优良的正极材料,但在高温试验中存在电导率相对较低、锰在电解液中溶解、结构从立方变形为四边形等问题。本文综述了抑制锰酸锂缺陷的主要研究方向:结构掺杂和表面涂层改性。对于LiMn2O4的掺杂,研究了单阳离子掺杂、多阳离子掺杂、单阴离子掺杂、阳离子与阴离子复合掺杂等几种观点。表面改性方法包括用碳质化合物、氧化物、磷酸盐和固体电解质溶液等不同的材料进行涂层。与原始样品相比,改性后的锰酸锂表现出更好的循环性能,在高放电倍率和高温下表现出更好的性能,并提高了锂离子的扩散系数。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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