颗粒尺寸对CoSb_3电极电化学性能的影响  

EFFECT OF PARTICLE SIZE ONELECTROCHEMICAL PROPERTIESOF CoSb_3 ELECTRODES

作　　者：张丽娟[1] 赵新兵[1] 蒋小兵[1] 曹高劭[1] 

机构地区：[1]浙江大学

出　　处：《材料研究学报》2002年第4期429-433,共5页Chinese Journal of Materials Research

基　　金：国家自然科学基金No.59771032;教育部博士点基金No.97033518;20010335045资助

摘　　要：制备了颗粒尺寸不同的锂离子电池CoSb3电极材料,研究了颗粒尺寸对电极电化学性能的影响.结果表明,CoSb3的首次可逆容量从粗颗粒（约6μm）的385mAhg-1提高到球磨粉（约100nm）的586mAhg-1.微米尺寸CoSb3的首次不可逆容量主要是嵌锂时颗粒破碎失效引起的,而球磨纳米粉末的不可逆容量来源于锂的氧化反应和形成表面含锂化合物.球磨CoSb3的循环寿命低于期望值,但50次循环后的体积可逆容量仍比石墨负极材料高很多.CoSb3 compounds with different particle size have been prepared and studied as the potential anode materials for lithium-ion batteries. It is shown that the reversible capacities of CoSb3 electrode in the first cycle increase with the decrease of particle size of the materials from 385 mAhg-1 for the coarse posers (about 6 μm) to 586 mAhg-1 for the ball milled fine powders (smaller than 100 nm). The irreversible capacities in the first cycle have been considered being caused mainly by the breakage of CoSb3 particles for the micrometer sized powders and by the oxidization of lithium for the nanometer sized powders. It is found that the capacity retention during cycling of the ball milled CoSb3 powders is poorer than what expected due to the granular structures, although its volume reversible capacity remains higher than 1.6 Ah(cm)-3 after 50 cycles, which is almost twice that of graphite.

关 键 词：电化学性能 锂离子电池 阳极材料 CoSb3 颗粒尺寸 钴锑金属间化合物 

分 类 号：TM912[电气工程—电力电子与电力传动] TM646.5