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    Solid-state batteries designed with high ion conductive composite polymer electrolyte and silicon anode

    Year: 2021

    Journal: Energy Storage Mater., Volume 43, DEC, page 165–171

    Authors: Pan, Jun; Peng, Huili; Yan, Yehao; Bai, Yuzhou; Yang, Jian; Wang, Nana; Dou, Shixue; Huang, Fuqiang

    Organizations: Key Research Program of Frontier Science of the Chinese Academy of Sciences [QYZDJ-SSW-JSC013]; Super Post-Doctoral Fellow Program of Shanghai [E01SCB17]; NSF of China [51972326]; Youth Innova-tion Promotion Association CAS; Australian Research Council [DE200101384]

    Keywords: LiF interface; In-situ polymerization; Silicon anode; High ion conductivity; Polymer solid-state battery

    Polymer solid-state batteries (SSBs) possess the advantages of good interfacial contact, but their application faces low ionic conductivity. Here, three-dimensional (3D) porous composite polymer electrolytes with propylene carbonate plasticizer (3D-PPLLP-CPEs) fabricated effectively, displaying high ionic conductivity even at room temperature. Electrochemical in-situ polymerization of 3D-PPLLP-CPEs occurs during the first discharge process, avoiding safety issues caused by the liquid plasticizer without sacrificing the ionic conductivity of the electrolyte. Besides, the controllable in-situ generated LiF-enriched interface can avoid the Li dendrite growth. To further promote the practical value of SSBs, micro-sized Si@Li3PO4@C with high initial Coulombic efficiency was adopted to replace lithium foil. The LiNi1/3Co1/3Mn1/3O2 (NCM111)//Micro Si@Li3PO4@C full cell has achieved capacity of 129.1 mAh g(-1) at a current density of 0.2 C, with capacity retention of 98.5% after 100 cycles, which is the best performance based on the Si anode in SSBs. Even at the high current density of 2.0 A g(-1), the capacity remains 92.5 mAh g(-1). This design of CPEs and electrodes has paved a new way to construct practical SSBs.
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