Improved Cycle Properties of FeS2 Cathode Material with Metallic Additives
来源期刊：材料科学与工程学报2007年第6期
论文作者：Ki-Won Kim Gouri Cheruvally Jae-Kwang Kim Hyo-Jun Ahn Jou-Hyeon Ahn Jae-Won Choi Dong-Kyu Park
关键词：FeS2; lithium battery; cathode material; cycle performance;
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 enhancement 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. FeS2 with 5wt% Co exhibited a stable cycle performance delivering a reversible capacity of 338mAh/g (37.8% of theoretical capacity) after 20 cycles.
Ki-Won Kim1，Gouri Cheruvally2，Jae-Kwang Kim2，Hyo-Jun Ahn1，Jou-Hyeon Ahn2，Jae-Won Choi2，Dong-Kyu Park3
(1.School of Nano and Advanced Materials Engineering and Engineering Research Institute, Gyeongsang National University, 900 Gajwa-dong, Jinju, 660-701, Korea;
2.Department of Chemical & Biological Engineering and Engineering Research Institute, Gyeongsang National University, 900 Gajwa-dong, Jinju, 660-701, Korea;
3.Kaya Advanced Material Art Inc., Baekrok-Ri 1010-1, Yangsan 626-862, Korea)
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 enhancement 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. FeS2 with 5wt% Co exhibited a stable cycle performance delivering a reversible capacity of 338mAh/g (37.8% of theoretical capacity) after 20 cycles.
关键词:FeS2; lithium battery; cathode material; cycle performance;
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