锂硫(Li-S)电池具有比锂离子电池更高的能量密度,是近10年来的研究热点,但目前锂硫电池的循环性能和倍率性能远远不能满足人们的需求。在本研究中,二(2,2,2-三氟乙基)碳酸酯(DTFEC)作为一种电解液添加剂应用到锂硫电池中,以提高电池的...锂硫(Li-S)电池具有比锂离子电池更高的能量密度,是近10年来的研究热点,但目前锂硫电池的循环性能和倍率性能远远不能满足人们的需求。在本研究中,二(2,2,2-三氟乙基)碳酸酯(DTFEC)作为一种电解液添加剂应用到锂硫电池中,以提高电池的电化学性能,并对DTFEC的添加量进行了筛选和优化。结果表明,DTFEC的添加量对电池性能有很大的影响,当添加体积分数为5%时,复合硫正极材料(S@p PAN)表现出最佳的循环稳定性和倍率性能。室温条件下进行充放电测试,在1C的充放电电流下,锂硫电池在循环200圈后容量保持率比常规电解液约高20%;在7C的大倍率充放电电流下,依然可以得到1246.3 m A·h/g的可逆比容量。以上结果表明,DTFEC可以有效提高锂硫电池的电化学性能,是一种适合用于锂硫电池电解液体系的添加剂。展开更多
Secondary lithium-sulfur batteries have attracted extensive attention due to their high energy density,low cost and environment friendly.However,the"shuttle effect"of polysulfides dissolved in liquid electro...Secondary lithium-sulfur batteries have attracted extensive attention due to their high energy density,low cost and environment friendly.However,the"shuttle effect"of polysulfides dissolved in liquid electrolytes leads to a decrease of the cell Coulomb efficiency(CE).Therefore,researchers have used solid electrolytes instead of traditional liquid electrolytes and separators to suppress the"shuttle effect"of polysulfides and the growth of lithium dendrites.The progress in electrolytes for solid-state lithium-sulfur batteries including solid-state polymer,inorganic,and composite electrolytes to solve the issues is summarized.展开更多
文摘锂硫(Li-S)电池具有比锂离子电池更高的能量密度,是近10年来的研究热点,但目前锂硫电池的循环性能和倍率性能远远不能满足人们的需求。在本研究中,二(2,2,2-三氟乙基)碳酸酯(DTFEC)作为一种电解液添加剂应用到锂硫电池中,以提高电池的电化学性能,并对DTFEC的添加量进行了筛选和优化。结果表明,DTFEC的添加量对电池性能有很大的影响,当添加体积分数为5%时,复合硫正极材料(S@p PAN)表现出最佳的循环稳定性和倍率性能。室温条件下进行充放电测试,在1C的充放电电流下,锂硫电池在循环200圈后容量保持率比常规电解液约高20%;在7C的大倍率充放电电流下,依然可以得到1246.3 m A·h/g的可逆比容量。以上结果表明,DTFEC可以有效提高锂硫电池的电化学性能,是一种适合用于锂硫电池电解液体系的添加剂。
基金financially supported by the National Natural Science Foundation of China (Nos.21333007, U1705255,21373137)New Century Excellent Talents in University(No.NCET-13-0371)
文摘Secondary lithium-sulfur batteries have attracted extensive attention due to their high energy density,low cost and environment friendly.However,the"shuttle effect"of polysulfides dissolved in liquid electrolytes leads to a decrease of the cell Coulomb efficiency(CE).Therefore,researchers have used solid electrolytes instead of traditional liquid electrolytes and separators to suppress the"shuttle effect"of polysulfides and the growth of lithium dendrites.The progress in electrolytes for solid-state lithium-sulfur batteries including solid-state polymer,inorganic,and composite electrolytes to solve the issues is summarized.
