摘要
锂硫电池由于具有较高的理论比能量和环保性能,已成为最有前途的高比能电池系统之一。然而,锂金属阳极在锂硫电池中的实际应用仍有阻碍。本文设计了一种简单的方法在锂阳极上制备锂硅/氯杂化保护层,该保护层不仅能对锂枝晶生长起到抑制作用,还为电荷的快速转移提供了动能。由于硫化聚丙烯腈的高导电性和改性锂阳极的高交换电流密度,使得锂-硫化聚丙烯腈电池能够保持稳定的充放电循环,并表现出优异的倍率性能。即使阴极有8 mAh/cm^2的高面积容量,电池也可以在0.2C时以500 mAh/g的比容量保持50次以上的循环。
Lithium-sulfur battery has become one of the most promising high-specific energy battery systems due to their high theoretical specific energy and environmental protection.However,the lithium metal anode’s practical application in Li-S battery is limited by dendrite growth issue.In this paper,a simple method is designed to manufacture a lithium silicon/chloride hybrid protect layer on the lithium anode,which not only inhibit the dendrite growth,but also provide a fast charge-transfer kinetic.Due to the high electrical conductivity of sulfurized polyacrylonitrile and the high exchange current densities of modified lithium anode,lithium-sulfurized polyacrylonitrile battery can keep a stable charge/discharge cycling,and exhibit an excellent rate performance.Even with the high areal capacity of 8 mAh/cm^2,the cell also can provide 500 mAh/g over 50 cycles at 0.2 C.Such facile method of lithium surface protection has positive significance to the industrial application of lithium sulfur battery.
作者
张泽平
黄兰萍
陈康华
帅毅
Zhang Zeping;Huang Lanping;Chen Kanghua;Shuai Yi(Powder Metallurgy Research Institute,Central South University,Changsha 410083,China;Light Alloy Metal Research Institute,Central South University,Changsha 410083,China)
出处
《山东化工》
CAS
2019年第9期25-27,31,共4页
Shandong Chemical Industry
基金
国家重点研发计划(2016YFB0300801)
国家自然科学基金重大科研仪器设备研制专项(51327902)
关键词
表面改性
锂金属阳极
硫化聚丙烯腈
surface modification
Lithium metal anode
sulfurized polyacrylonitrile
