Cross-Linked Nanohybrid Polymer Electrolytes With POSS Cross-Linker for Solid-State Lithium Ion Batteries

被引:29
作者
Zhang, Jinfang [1 ]
Li, Xiaofeng [1 ]
Li, Ying [1 ]
Wang, Huiqi [1 ]
Ma, Cheng [2 ]
Wang, Yanzhong [1 ]
Hu, Shengliang [1 ]
Wei, Weifeng [2 ]
机构
[1] North Univ China, Sch Mat Sci & Engn, Taiyuan, Shanxi, Peoples R China
[2] Cent S Univ, State Key Lab Powder Met, Changsha, Hunan, Peoples R China
基金
中国国家自然科学基金;
关键词
solid-state lithium ion batteries; cross-linked; polymer electrolyte; poly (ethylene oxide); POSS; BLOCK-COPOLYMER ELECTROLYTES; COMPOSITE ELECTROLYTES; NANOCOMPOSITES; CONDUCTIVITY; STORAGE; OXIDE); LAYER;
D O I
10.3389/fchem.2018.00186
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
A new class of freestanding cross-linked hybrid polymer electrolytes (HPEs) with POSS as the cross-linker was prepared by a one-step free radical polymerization reaction. Octavinyl octasilsesquioxane (OV-POSS) with eight functional corner groups was used to provide cross-linking sites for the connection of polymer segments and the required mechanical strength to separate the cathode and anode. The unique cross-linked structure offers additional free volume for the motion of EO chains and provides fast and continuously interconnected ion-conducting channels along the nanoparticles/polymer matrix interface. The HPE exhibits the highest ionic conductivity of 1.39 x 10(-3) S cm(-1), as well as excellent interfacial compatibility with the Li electrode at 80 degrees C. In particular, LiFePO4/Li cells based on the HPE deliver good rate capability and long-term cycling performance with an initial discharge capacity of 152.1 mAh g(-1) and a capacity retention ratio of 88% after 150 cycles with a current density of 0.5 degrees C at 80 degrees C, demonstrating great potential application in high-performance LIBs at elevated temperatures.
引用
收藏
页数:10
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