锂离子电池液态GaSn自修复负极材料的制备及其电化学性能  

Preparation and electrochemical properties of liquid GaSn self-repairing anode materials for lithium-ion batteries

作　　者：陈玉[1,2] 夏鑫 CHEN Yu;XIA Xin(College of Textile and Clothing, Xinjiang University, Urumqi, Xinjiang 830046, China;School of Chemical Engineering and Technology, Xinjiang University, Urumqi, Xinjiang 830046, China;Key Laboratory of Textile Science & Technology, Ministry of Education, Donghua University, Shanghai 201620, China)

机构地区：[1]新疆大学纺织与服装学院,新疆乌鲁木齐830046 [2]新疆大学化工学院,新疆乌鲁木齐830046 [3]东华大学纺织面料技术教育部重点实验室,上海201620

出　　处：《纺织学报》2021年第6期57-62,共6页Journal of Textile Research

基　　金：国家自然科学基金项目(51763022);新疆自治区研究生教育教学改革项目(XJ2019GY10);自治区高校科研青年计划项目(XJEDU2018Y006)。

摘　　要：为解决目前锂离子电池负极材料固有的体积膨胀问题,使用室温下呈液态的镓锡(GaSn)合金作为锂离子电池负极材料,通过静电纺丝法将液态GaSn合金束缚在纳米纤维内部以及纳米纤维的网络状结构中间,并组装成锂离子电池,对其结构和性能进行表征与分析。结果表明:液态GaSn合金可均匀地分散在碳纳米纤维中,同时GaSn合金由于超声空化作用形成液态小液滴,在循环过程中由于流动性和高表面张力逐渐聚集成大液滴而被固定在纳米纤维网络结构中间,有利于电极材料自愈性更好发挥,可有效修复电池在循环过程中所产生的裂纹;100圈充放电循环测试后,电池的容量保持率达94.8%。In order to solve the inherent volume expansion problem of current lithium-ion battery anode materials,gallium tin(GaSn)alloy that was liquid at room temperature was used as the lithium-ion battery anode material.The liquid GaSn alloy was bound inside the nanofibers and the network structure of nanofibers by electrospinning,and then assembled into lithium-ion batteries.The structure and performance of the batteries were characterized and analyzed.The results show that the liquid GaSn alloy can be evenly dispersed in the carbon nanofibers,and at the same time,the GaSn alloy forms small liquid droplets due to ultrasonic cavitation,which are gradually fixed into large droplets due to fluidity and high surface tension during the cycle.It is conducive to better display of the self-healing properties of the electrode material,and it can effectively repair the cracks generated during the battery cycle.After 100 cycles of charging and discharging test,the capacity retention rate of the battery reaches 94.8%.

关 键 词：液态合金 自修复 锂离子电池 负极材料 电化学性能 静电纺丝 

分 类 号：TB34[一般工业技术—材料科学与工程]