Improved Cycle Properties of FeS₂ Cathode Material with Metallic Additives

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• 出版年：2007
• 作者：Jae-Won Choi；Jae-Kwang Kim；Gouri Cheruvally；Jou-Hyeon Ahn；Ki-Won Kim；Hyo-Jun Ahn；Dong-Kyu Park
• 单位1：Department of Chemical Biological Engineering and Engineering Research Institute，Gyeongsang National University，900Gajwa-dong
• 语种：中文
• 作者关键词：FeS₂；lithium battery；cathode material；cycle performance
• 起始页：910
• 总页数：4
• 刊名：材料科学与工程学报
• 是否内版：否
• 刊频：双月刊
• 创刊时间：1983
• 主管单位：国家教育部
• 主办单位：浙江大学
• 主编：赵新兵
• 地址：杭州浙江大学材料系
• 邮编：310027
• 电子信箱：jmse@ema.zju.edu.cn
• 卷：25
• 期：6
• 期刊索取号：P822.06 448
• 数据库收录：美国CA源期刊；全国中文核心期刊；中国科技论文统计源期刊；中国科学引文数据库来源期刊；美国CSA收录期刊
• 核心期刊：全国中文核心期刊

摘要

Iron disulfide（FeS₂）cathode active material was prepared from iron and sulfur at room temperature by high energy mechanical alloying. Modified FeS₂ composites containing Co or Ni transition metal powders as additives were also prepared by the same method. Lithium cells with these FeS2 cathodes were studied for charge-discharge properties at room temperature using 0.5M LiTFSI in tetra（ethylene glycol） dimethyl ether（TEGDME）solvent.Cyclic voltammetry showed two anodic oxidation peaks at 1.8 and 2.5V and two cathodic reduction peaks at 2.0 and 1.3 V for FeS₂ with metal additives. The addition of 5wt% Co and 3wt% Ni resulted in an enhancerment of the first discharge capacity giving 571 and 844mAh/g respectively at 0.1C-rate. The cycle performance was also enhanced remarkably by the addition of these electrically conductive transition metals in the active material.FeS with 5wt% Co exhibited a stable cycle performance delivering a reversible capacity of 338mAh/g （37.8% of theoretical capacity） after 20 cycles