A new fluorine-containing star-branched polymer as electrolyte for all-solid-state lithium-ion batteries

作者：Xu, Hao; Wang, Ailian; Liu, Xu; Feng, Di; Wang, Shi; Chen, Jie; An, Yan^*; Zhang, Liaoyun^*

来源：Polymer, 2018, 146: 249-255.

DOI：10.1016/j.polymer.2018.05.045

• Star-branched
• Fluorine-containing polymer
• All-solid-state polymer electrolyte

The trade-off between ionic conductivity and mechanical strength is still a great challenge for all-solidstate polymer electrolyte. Herein, a novel structure-controlled fluorine-containing star-branched polymer (HBPS-(PTFEMA-b-PPEGMA)(27)) with a hyperbranched polystyrene core and polytrifluoroethyl methacrylate-block-poly (ethylene glycol) methyl ether methacrylate arms is synthesized by atom transfer radical polymerization. Combining the good mechanical strength of fluorine-containing segments and flexible property of PEG segments, the prepared HBPS-(PTFEMA-b-PPEGMA)(27)/LiTFSI solid polymer electrolyte can form flexible transparent self-standing membrane and exhibits the high ionic conductivity of 2.4 x 10(-5) S cm(-1) at 25 degrees C, as well as good thermal stability with the thermal decomposition temperature of 374.7 degrees C. It also possesses a wide electrochemical window of 4.9 V and good interfacial compatibility. Moreover, the Li/LiFePO4 cell based on this solid state star-branched polymer electrolyte membrane delivers a high discharge capacity of 147.2 mAh g(-1) under a current density of 0.1C at 60 degrees C.

• 出版日期2018-6-20
• 单位北京农学院; 中国科学院大学