【摘要】 电动汽车、便携式电子设备和储能设备等行业的快速发展,对高能量密度锂离子电池的需求日益迫切.硅材料由于具有最高的理论储锂容量,目前成为锂离子电池负极材料的研究热点.通过温和的溶液刻蚀工艺并结合热解还原法制备了镍、碳修饰的亚微米一维结构硅负极材料,并对其进行结构分析和电化学研究.结果表明:制备所得的硅亚微米线表面实现了镍纳米粒子的均匀修饰和碳材料的包覆,在1C的电流密度下表现出900mAh/g的可逆储锂容量.一维结构设计与镍、碳修饰可以提升硅材料的循环与倍率性能,为高性能锂离子电池负极材料的制备提供可能.更多还原

【Abstract】 To meet the increasing demand of electric vehicles,portable electronics and energy storage devices,the development of high performance lithium-ion battery(LIB)is of great importance.Si has been considered as a promising anode electrode material for high power LIB due to the highest theoretical capacity of Si.Herein,the composite material of Si sub-micrometer wires with the nickel and carbon modification were obtained via a convenient solution etching approach and a simple pyrolytic reduction process. Furthermore, the structure and electrochemical performance of the as synthesized composite electrode were studied.In combination with the uniform dispersion of nickel nanoparticles and the coating of carbon,the as synthesized composite electrode demonstrated good cycling stability and rate capability,delivering a high reversible capacity of 900 mAh/g at 1C.The one-dimensional structure and the functional coating enable improved cycling and rate performances of Si electrode materials for highperformance LIB.更多还原