摘要
锂-硫化聚丙烯腈电池是具有高容量的锂金属电池。但是锂金属负极枝晶生长问题一直制约了该电池的发展。用来稳定正极材料硫化聚丙烯腈的碳酸酯类电解液中,锂枝晶生长尤为严重。本文通过在碳酸酯类电解液中添加混合碱金属离子,在Na^(+)和K^(+)的共同作用下,锂枝晶的生长被明显的抑制。应用在锂铜半电池中得到了高而稳定的库伦效率。而且,锂-硫化聚丙烯腈电池的循环稳定性得到了极大的改善。在1C(1C=700 mAg^(-1))大倍率下,100次循环后放电容量保持率依然能达到80%,远高于未加其他碱金属离子的48%。
Lithium-sulfurized polyacrylonitrile batteries are lithium metal batteries with high capacity.However,the dendritic growth of lithium metal negative electrode has always restricted the development of this battery.In the carbonate electrolyte used to stabilize the positive electrode material polyacrylonitrile sulfide,the growth of lithium dendrites is particularly serious.In this paper,by adding polybasic alkali metal ions to the carbonate electrolyte,under the joint action of Na^(+)and K^(+),the growth of lithium dendrites is obviously inhibited.High and stable coulombic efficiency is obtained when applied to lithium copper half-cells.Moreover,the cycle stability of lithium-sulfurized polyacrylonitrile batteries has been greatly improved.At a high rate of 1C(1C=700 mA g^(-1)),the discharge capacity retention rate can still reach 80%after 100 cycles,which is much higher than 48%without other alkali metal ions.
作者
张超
张彪
娄瑾
王玉
帅毅
陈康华
祝昌军
Zhang Chao;Zhang Biao;Lou Jin;Wang Yu;Shuai Yi;Chen Kanghua;Zhu Changjun(Light Alloy Research Institute,Central South University,Changsha,Hunan 410083,China;Powder Metallurgy Research Institute,Central South University,Changsha 410083,China;Department of Mechanical Engineering,Hunan Institute of Engineering,Xiangtan 411104,China)
出处
《山东化工》
CAS
2021年第6期12-15,共4页
Shandong Chemical Industry
基金
国家自然科学基金资助项目(51327902)。
关键词
硫化聚丙烯腈
锂金属电池
碱金属离子
锂枝晶
sulfurized polyacrylonitrile
lithium metal battery
alkali metal ion
lithium dendrites
