The Spinel Phases LiM y Mn2 − y O 4 (M = Co, Cr, Ni) as the Cathode for Rechargeable Lithium Batteries

作者：Guohua Li, Hiromasa Ikuta, Takashi Uchida, Masataka Wakihara · 发表于：Journal of The Electrochemical Society · 年份：1996 · DOI：10.1149/1.1836405 · 被引用次数：464 · 研究领域：Advancements in Battery Materials、Advanced Battery Materials and Technologies、Extraction and Separation Processes

To improve the cycle performance of spinel LiMn 2 O 4 as the cathode of 4 V class lithium secondary batteries, the quaternary spinel phases LiM y Mn 2 − y O 4 (M = Co, Cr, Ni; y = 1/12, 1/9, 1/6, 1/3) were prepared at 750°C in air. X‐ray diffraction and electrochemical studies were carried out using the Li | Li x M y Mn 2 − y O 4 cells. These cathodes were more tolerant to repeated lithium extraction and insertion than a standard LiMn 2 O 4 spinel electrode in spite of a small reduction in the initial capacity. Considering both cycle life and capacity density, LiCo 1 / 6 Mn 11 / 6 O 4 showed good cycle performance with an energy density of 370 Wh kg − 1 at the 300th cycle. The improvement in cycling performance is attributed to the stabilization in the spinel structure by the doped metal cations.