钛酸锂/碳双层包覆氧化亚硅基负极材料及其电化学性能研究  

Electrochemical Performance of Silicon Monoxide-Based Anode Material Coated with Layers of Li_4Ti_5O_(12)/C

作　　者：银华杰 王力 孙波 陈立夫 谭婷 杨乐之 YIN Huajie;WANG Li;SUN Bo;CHEN Lifu;TAN Ting;YANG Lezhi(Changsha Research Institute of Mining and Metallurgy Co.,Ltd.,Changsha 410012,Hunan,China)

机构地区：[1]长沙矿冶研究院有限责任公司,湖南长沙410012

出　　处：《矿冶工程》2024年第6期163-169,共7页Mining and Metallurgical Engineering

基　　金：长沙矿冶研究院有限责任公司科技创新项目(CL-22-01)。

摘　　要：通过化学气相沉积和溶胶-凝胶法制备了钛酸锂/碳双层包覆的氧化亚硅基锂离子电池负极材料。电化学测试结果表明,钛酸锂包覆量3%时,负极材料性能较好,在0.2C、0.5C、1C、2C、4C倍率下的比容量分别为1 485.4、1 443.8、1 386.4、1 341、1 276.2 mAh/g,在电流密度750 mA/g下循环150次后比容量为1 138.1 mAh/g。柔韧的碳层可以缓冲内部硅芯的体积膨胀并提高材料电导率,刚性的钛酸锂可以保证材料结构完整性,双壳层协同作用有效提升了电极材料的循环稳定性、倍率性能和可逆容量。A kind of silicon monoxide-based anode material coated with layers of lithium titanate and carbon was synthesized by chemical vapor deposition and sol-gel method.The electrochemical measurement shows that with lithium titanate coating at an amount of 3%,the anode material presents good performance,showing that the specific capacity is 1 485.4,1 443.8,1 386.4,1 341 and 1 276.2 mAh/g correspondingly at 0.2C,0.5C,1C,2C and 4C rate respectively,and the specific capacity is 1 138.1 mAh/g after 150 charge-discharge cycles at current density of 750 mA/g.The flexible carbon layer can buffer volume expansion of the internal silicon core and improve the conductivity of the material.The rigid lithium titanate can ensure structural integrity of the material.The synergy of two layers of coatings can effectively improve cycle stability,rate performance and reversible capacity of electrode material.

关 键 词：锂离子电池 氧化亚硅 负极材料 双壳层结构 钛酸锂 碳包覆 硅基材料 

分 类 号：TM912[电气工程—电力电子与电力传动] TB302[一般工业技术—材料科学与工程]