基于离子凝胶电解质的TiO_(2)(B)@C/CNT//AC准固态锂离子电容器  

Ionogel electrolyte based TiO_(2)(B)@C/CNT//AC quasi-solid-state lithium-ion capacitors

作　　者：李伯森 张家赫 杨立鹏 李佳佳 邢春贤 张海涛[1,2] Bosen LI;Jiahe ZHANG;Lipeng YANG;Jiajia LI;Chunxian XING;Haitao ZHANG(Beijing Key Laboratory of Ionic Liquids Clean Process,CAS Key Laboratory of Green Process and Engineering,Institute of Process Engineering,Chinese Academy of Sciences,Beijing 100190,China;School of Chemical Engineering,University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院过程工程研究所,离子液体清洁过程北京市重点实验室,绿色过程与工程重点实验室,北京100190 [2]中国科学院大学化学工程学院,北京100049

出　　处：《过程工程学报》2021年第4期479-487,共9页The Chinese Journal of Process Engineering

基　　金：国家重点研发计划新能源汽车专项(编号:2016YFB0100303);国家自然科学基金资助项目(编号:21878308);郑州市科技重大专项(编号2019CXZX0074)。

摘　　要：以微波辅助溶剂热法制备多壁碳纳米管负载的碳包覆单斜相二氧化钛纳米复合电极,通过静电纺丝技术制备聚酰亚胺纤维膜,进而制备三元离子凝胶电解质,最后与商业活性炭组装成新型准固态锂离子电容器。结果表明,TiO_(2)(B)@C/CNT纳米复合电极呈现出高可逆容量(291 m Ah/g)和高电化学反应动力学特性。PI/[EMIM][BF_(4)]/Li TFSI离子凝胶电解质呈现出高离子电导率和电化学稳定性,其可将锂离子电容器的工作电压拓展至3.8 V。由于电解质中存在离子液体,器件的电化学性能呈现出明显的温度依赖性。准固态锂离子电容器在60℃时最大能量密度和最大功率密度分别为83.1 Wh/kg和18338.1 W/kg。Lithium-ion capacitors(LICs) are attracting extensive attentions owing to their high energy density, rapid power output, and excellent cyclability. However, one of the key challenges encountered by LICs is balancing the sluggish kinetics of intercalation electrodes against capacitive electrodes. In this work, a Ti O2(B)@C/CNT nanohybrid electrode was synthetized by a microwave-assisted solvothermal method. The nanohybrids exhibited a high reversible capacity of 291 m Ah/g and high kinetic characteristics. Subsequently, a polyimide(PI) membrane was prepared by electrospinning technique for the construction of a ternary ionogel electrolyte. The ionogel electrolyte exhibited high ionic conductivity and electrochemical stability. Notably, a quasi-solid-state lithium-ion capacitor(QSLIC) was assembled with TiO_(2)(B)@C/CNT as anode, commercial activated carbon(AC) as cathode and the ionogel electrolyte. It delivered a maximum energy density of 83.1 Wh/kg and a maximum power density of 18338.1 W/kg at 60℃. Moreover, the electrochemical performances of the QSLIC exhibited an obvious temperature dependence.

关 键 词：离子凝胶电解质 静电纺丝 锂离子电容器 单斜相二氧化钛 纳米复合电极 

分 类 号：TB33[一般工业技术—材料科学与工程] TM53[电气工程—电器]