锂离子电池负极材料银纳米线的锂化机制  

Lithiation mechanism of silver nanowires as negative electrode materials forlithium-ion batteries

作　　者：刘海辉[1,2,3] 张欣欣[1,2,3] LIU Haihui;ZHANG Xinxin(School of Material Science and Engineering,Tiangong University,Tianjin 300387,China;State Key Laboratory of Separation Membranes and Membrane Processes,Tiangong University,Tianjin 300387,China;Key Laboratory of Ad-vanced Fiber and Energy Storage Technology,Tiangong University,Tianjin 300387,China)

机构地区：[1]天津工业大学材料科学与工程学院,天津300387 [2]天津工业大学省部共建分离膜与膜过程国家重点实验室,天津300387 [3]天津工业大学先进纤维与储能技术重点实验室,天津300387

出　　处：《天津工业大学学报》2024年第2期55-59,共5页Journal of Tiangong University

基　　金：国家自然科学基金资助项目(52271011)。

摘　　要：为了探究银纳米线在不同工作电压下的锂化机制,借助原位透射电子显微镜的高分辨技术和电子衍射技术,研究了在不同的工作电压条件下,银纳米线在锂化过程中的相变过程和形貌变化。结果表明:金属银用于电池负极材料时,其工作电压对电极材料的活性有较大影响;银在低工作电压下的储锂量大,电极材料不易失效;当工作电压为-1 V时,Ag纳米线在储存锂离子过程中会先变成LiAg相,无明显体积形变;后续随着锂化时间增加,Li_(x)Ag合金中x>1时,纳米线粉碎化,生成Li3Ag、Li9Ag4相;当外加的电压为-2 V时,锂离子会快速在纳米线表面运输并与Ag发生反应,导致纳米线破碎。In order to explore the lithiation mechanism of silver nanowires at different working voltages,with the help of high-resolution technique and electron diffraction technique of in situ transmission electron microscopy,the phase transition process and morphology transition of silver nanowires during lithiation under different working voltages were studied.The results show that when metallic silver is used as the negative electrode material of the battery,its working voltage has a great influence on the activity of the electrode material;silver has a large amount of lithium storage at low operating voltage,and the electrode material is not easy to fail.When the operating voltage is-1 V,the Ag nanowires first form LiAg phase during the process of storing lithium ions,and there is no obvious volume deformation.With the subsequent increase of lithiation time,when the x in Li_(x)Ag alloy exceeds 1,the nanowires are pulverized to form Li3Ag and Li9Ag phases;when the applied voltage is-2 V,lithium ions are rapidly transported on the surface of nanowires and react with Ag,and leading to the fragmentation of nanowires.

关 键 词：锂离子电池 负极材料 AG纳米线 锂化反应机制 原位透射电镜 

分 类 号：TB152[天文地球—天文学] TM911.3[电气工程—电力电子与电力传动]