摘要
为了提高锂负极的循环稳定性能,需要对金属锂进行改性保护,改善锂沉积行为,抑制锂枝晶的产生。主要使用冰醋酸挥发气体与锂负极原位反应,在金属锂表面原位形成一层醋酸锂,得到CH3COOLi-Li负极。表面形成的醋酸锂钝化膜可以抑制锂与电解液的反应,抑制循环过程中锂枝晶的生长。组装对称锂电池、锂铜电池和钴酸锂全电池并对其进行电化学表征,均表明CH3COOLi-Li负极相比于纯Li负极,电池的循环稳定性能得到明显改善。CH3COOLi-Li负极的锂铜电池循环100圈后Coulomb效率仍稳定在97%以上,组装的CH3COOLi-Li/LiCoO2全电池循环1000圈容量保持率高达73.5%。
Surface modification and protection of lithium metal are widely regarded as effective methods to improve lithium deposition behaviors as well as suppress lithium dendrites.In this paper,acetic acid gas was used to react with lithium metal to obtain CH3 COOLi-Li anode.A lithium acetate passivation film formed on the lithium surface could prevent lithium metal from further reacting with the electrolyte,thus inhibiting lithium dendrite growth during cycling.The lithium battery,lithium copper battery,and lithium cobaltate full battery were assembled for electrochemical characterization of a proposed modified metal anode.The results show that CH3 COOLi-Li anode has a better cycle stability performance than pure Li anode.The Coulomb efficiency of lithium copper battery with CH3 COOLi-Li anode after 100 cycles remains at 97%,and CH3 COOLi-Li/LiCoO2 full battery has a capacity retention rate of 73.5%after 1000 cycles.
作者
陈昱锜
赵强
冯玉川
何泓材
CHEN Yuqi;ZHAO Qiang;FENG Yuchuan;HE Hongcai(School of Materials and Energy,University of Electronic Science and Technology of China,Chengdu 610054,China;Qingtao(Kunshan)Energy Development Co.Ltd.,Qingtao Institute of New Energy Materials,Kunshan 215300,Jiangsu,China)
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2020年第7期1055-1061,共7页
Journal of The Chinese Ceramic Society
基金
姑苏创新创业人才计划(ZXL2016095,ZXT2018001)
昆山双创人才计划(KSRC201704)。
关键词
锂电池
金属锂负极
钝化膜
冰醋酸挥发气体
醋酸锂
lithium battery
lithium metal anode
passivation film
acetic acid gas
lithium acetate
