采用固相法合成了纯六方相的TiS2粉体.X射线衍射(XRD)、扫描电子显微镜(SEM)结果表明该材料具有特征层状结构,其颗粒大小在10-20μm之间.作为锂离子电池负极材料,TiS2在3.00-0.00 V(vs Li/Li+)之间有3个明显的放电平台,首次可逆容量达668 mAh·g-1,在第一个放电电压范围(3.00-1.40V)内具有优异的循环可逆性.深度放电时由于Li2S的生成和材料颗粒严重破碎,在低于0.50 V时材料的循环性能不佳.通过减小材料颗粒度和提高导电剂含量,TiS2的电化学性能得到显著改善.%Hexagonal TiS2 was synthesized as a high-capacity anode material for lithium ion batteries.X-ray diffraction (XRD) and scanning electron microscopy (SEM) indicated that this material had a layered structure with particle sizes between 10 and 20 μm.It shows three discharge plateaus between 3.00 and 0.00 V with a reversible capacity of up to 668 mAh·g-1.It has excellent cycling performance between 3.00 and 1.40 V.Particle pulverization and formation of Li2S lead to performance degradation because of the irreversible dissolution of Li2S into the electrolyte below 0.50 V.The addition of extra acetylene black and a decrease in particle size markedly improve the electrochemical performance of the TiS2 anode.
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