Materials' effects on the elevated and room temperature performance of C/LiMn2O4 Li-ion batteries
Materials' effects on the elevated and room temperature performance of C/LiMn2O4 Li-ion batteries
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DOI：
10.1016/s0378-7753(97)02542-1
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发表时间：
1997-11-01
影响因子：
9.2
通讯作者：
Tarascon, JM
中科院分区：
文献类型：
--
作者：
Amatucci, GG;Schmutz, CN;Tarascon, JM
基于LiMn 2 O 4的锂离子可再充电电池在高温下具有相对差的储存和循环性能。为了解决这一问题，在室温和高温下的LiMn 2 O 4基系统的结构和电化学研究进行。一些尖晶石材料的特性，如形态，缺陷，表面积，结构不稳定性，单相与两相锂插入过程，阳离子和氧的化学计量，和锰的溶解度进行了研究。我们发现，样品的表面积，这也影响锰的溶解和电解质的氧化，是控制不可逆自放电的速率的最关键的参数之一，与最低的不可逆自放电被观察到的样品具有最低的表面积。这些结果进行了讨论的活性表面中心和表面处理的可能性，以纠正这个问题。发现对于具有低表面积（0.5-1 m2/g）、Li过量（x > 1.00）的那些LixMn 2 O 4 + δ样品，高温储存和室温循环性能是最好的，这些样品在低至-50 ℃下没有显示出Jahn-Teller畸变的证据，并且对于这些样品，在室温下单相反应中发生Li提取机制。(C)1977年由Elsevier Science S.A.出版
Li-ion rechargeable batteries based on LiMn2O4 suffer from relatively poor storage and cycling performance at elevated temperatures. In order to address this issue, a structural and electrochemical study of LiMn2O4-based systems at room and elevated temperatures were undertaken. Some of the spinel material characteristics such as morphology, defects, surface area, structural instability, single-Versus two-phase lithium-insertion processes, cation and oxygen stoichiometry, and manganese solubility were investigated. We found that the sample surface area, which also influences the manganese dissolution and electrolyte oxidation, is one of the most critical parameters in controlling the rate of irreversible self-discharge, with the lowest irreversible self-discharge being observed for samples with the lowest surface area. These results are discussed in terms of active surface centers and the possibility of surface treatments to rectify this problem. The elevated temperature storage and room temperature cycling performance was found to be the best for those LixMn2O4+delta samples having a low surface area (0.5-1 m(2)/g), Li in excess (x > 1.00), show no evidence of Jahn-Teller distortion down to -50 degrees C, and for which the Li-extraction mechanism occurs;over a single-phase reaction at room temperature. (C) 1977 Published by Elsevier Science S.A.