Nanocomposite All‐Solid‐State Polymer Electrolyte for High‐Performance Lithium Batteries

다국어 초록 (Multilingual Abstract)

An inorganic‐polymeric hybrid all‐solid‐state electrolyte (SSE) composed of chemically modified nano‐silica, linear poly(trifluoroethyl methacrylate)‐co‐poly(poly(ethylene glycol) methyl ether methacrylate copolymer (PTFEMA‐co‐PPEGMA or LCP) and lithium salt is prepared and used in lithium‐ion batteries (LIBs) for the first time. Nano‐silica is transformed to SiO2‐SH via esterification reaction. Then, SiO2‐PEGMA is synthesized through click chemistry of SiO2‐SH and PEGMA. The compatibility of the nano‐SiO2 and the LCP can be effectively improved due to the excellent dispersibility of the chemically modified nano‐SiO2 in the polymer matrix. As a result, the hybrid SSE has good thermal stability, excellent film‐forming ability. Furthermore, the hybrid SSE shows superior comprehensive electrochemical properties, which makes the corresponding LiFePO4/Li cells have good cycling performance (the discharge capacity reaches 144 mAh g−1 at 0.3 C) and rate capability (90 mAh g−1 is reached at 1 C). Thus, the hybrid electrolyte can be a powerful SSE for high‐safety and high‐performance LIBs.
The composite all‐solid‐state electrolyte shows obviously increased electrochemical performances due to the greatly improved compatibility of the chemically modified nano‐silica and the polymer matrix.