Improved Cycle Properties of FeS2 Cathode Material with Metallic Additives
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.
FeS2 lithium battery cathode material cycle performance
Jae-Won Choi Jae-Kwang Kim Gouri Cheruvally Jou-Hyeon Ahn Ki-Won Kim Hyo-Jun Ahn Dong-Kyu Park
国际会议
第二届功能原料国际研讨会(The 2rd International Symposium on Functional Materials)
杭州
英文
910-913
2007-05-16（万方平台首次上网日期，不代表论文的发表时间）