空心硬碳球低温下的储锂机制及性能  

Lithium storage mechanism and performance of hollow hard carbon spheres at low temperature

作　　者：郭建强 龚展鹏 任家旺 张平 牛卓越 方志斌 GUO Jianqiang;GONG Zhanpeng;REN Jiawang;ZHANG Ping;NIU Zhuoyue;FANG Zhibin(Department of Materials Engineering,Taiyuan Institute of Technology,Taiyuan,Shanxi 030000,China)

机构地区：[1]太原工业学院材料工程系,山西太原030000

出　　处：《电池》2024年第5期617-621,共5页Battery Bimonthly

基　　金：太原工业学院博士(后)科研资助项目(2023KJ046),太原工业学院来晋工作优秀博士(后)科研资助项目(2023LJ015)。

摘　　要：硬碳是一种高性能锂离子电池负极材料。以间苯二酚和甲醛溶液为原料合成前驱体,制备3种不同烧结温度(700℃、800℃和900℃)下的空心硬碳球(HCS-700、HCS-800和HCS-900),并对3种材料进行结构分析及低温储锂性能测试。3种硬碳材料中,HCS-800具有较大的比表面积及合适的孔径。在-20℃下,以0.2 A/g电流在0~3 V循环,HCS-800负极的首次放电比容量为104 mAh/g,第100次循环时为93 mAh/g,均高于HCS-700和HCS-900负极。循环伏安测试结果表明:在-20℃下,HCS-800负极的赝电容机制储锂占比为78.13%,在3种硬碳负极中最高。Hard carbon is a high-performance anode material for Li-ion battery.Precursors are synthesized using resorcinol and formaldehyde solutions as raw materials.Three kinds of hollow hard carbon spheres material(HCS-700,HCS-800 and HCS-900)are prepared at different sintering temperatures(700℃,800℃and 900℃).Structure analysis and low temperature lithium storage performance tests are conducted for these materials.Among the three kinds of hard carbon material,HCS-800 has larger specific surface area and appropriate pore size.The initial specific discharge capacity of HCS-800 anode is 104 mAh/g at-20℃and a current of 0.2 A/g in 0-3 V,and it is 93 mAh/g at the 100th cycle,which are higher than those of HCS-700 and HCS-900 anodes.The cyclic voltammetry test results show that the pseudocapacitive lithium storage contribution of HCS-800 anodes at-20℃is 78.13%,which is the highest among the three kinds of hard carbon anode.

关 键 词：硬碳 赝电容机制 低温 锂离子电池 电化学性能 

分 类 号：TM912.9[电气工程—电力电子与电力传动] TD98[矿业工程—选矿]