摘要
凝胶聚合物电解质作为一种高锂离子传导效率的聚合物电解质而备受关注。然而,制备凝胶聚合物电解质的过程仍存在催化剂难以脱除、流程繁琐等问题。在本工作中,采用离子液体1-丁基-3-甲基咪唑四氟硼酸盐(BMIMBF4)中潜在的Lewis酸诱导乙烯基醚类单体发生阳离子聚合的策略,探究出一种在电池内部原位构建高性能凝胶聚合物电解质的方法。BMIMBF4的引入提升了凝胶聚合物电解质的电导率和电化学稳定性,基于该凝胶聚合物电解质的锂对称电池能在0.1mA·cm^(-2)电流密度下循环500h。由该凝胶聚合物电解质原位组装的全电池以1C的倍率进行恒流充放电,循环100圈后容量保持率为90%;即使在10C的高倍率下时,电池的放电比容量仍能保持在67.5mAh·g^(-1)。该自催化策略为凝胶聚合物电解质的快速构建提供了新的思路。
Gel polymer electrolytes have attracted much attention as a kind of polymer electrolyte with high lithium ion conduction efficiency.However,the process of preparing gel polymer electrolytes still has some problems,such as difficult removal of catalyst and complicated process.In this work,the strategy of cationic polymerization of vinyl ether monomers induced by the potential Lewis acid in the ionic liquid 1-butyl-3-methylimidazolium tetrafluoroborate(BMIMBF4)was used to explore a method of in situconstruction of high performance gel polymer electrolytes inside the battery.The introduction of BMIMBF4has improved the conductivity and electrochemical stability of gel polymer electrolytes.The lithium symmetrical battery based on the gel polymer electrolyte can cycle for 500hat the current density of 0.1mA·cm^(-2).The full battery in situ assembled by the gel polymer electrolyte is charged and discharged at a rate of 1C,and the capacity retention is 90%after 100cycles;Even at a high rate of 10C,the discharge specific capacity of the battery can still be maintained at 67.5 mAh·g^(-1).The self-catalyzed strategy provides a new idea for the facile fabrication of gel polymer electrolytes.
作者
李芬
郭楷瑞
薛志刚
LI Fen;GUO Kai-rui;XUE Zhi-gang(School of Chemistry and Chemical Engineering,Huazhong University of Science and Technology,Wuhan 430074,China)
出处
《高分子通报》
CAS
CSCD
北大核心
2023年第11期1570-1579,共10页
Polymer Bulletin
基金
国家自然科学基金(51973073)。
关键词
锂离子电池
凝胶聚合物电解质
原位聚合
自催化策略
Lithium-ion batteries
Gel polymer electrolyte
In situ polymerization
Self-catalyzed strategy