首页|A three-dimensional co-continuous network structure polymer electrolyte with efficient ion transport channels enabling ultralong-life all solid-state lithium metal batteries

A three-dimensional co-continuous network structure polymer electrolyte with efficient ion transport channels enabling ultralong-life all solid-state lithium metal batteries

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Solid polymer electrolytes(SPEs)have emerged as one of the most promising candidates for the construc-tion of solid-state lithium batteries due to their excellent flexibility,scalability,and interface compatibil-ity with electrodes.Herein,a novel all-solid polymer electrolyte(PPLCE)was fabricated by the copolymer network of liquid crystalline monomers and poly(ethylene glycol)dimethacrylate(PEGDMA)acts as a structural frame,combined with poly(ethylene glycol)diglycidyl ether short chain interspersed serving as mobile ion transport entities.The preparaed PPLCEs exhibit excellent mechanical property and out-standing electrochemical performances,which is attributed to their unique three-dimensional co-continuous structure,characterized by a cross-linked semi-interpenetrating network and an ionic liquid phase,resulting in a distinctive nanostructure with short-range order and long-range disorder.Remarkably,the addition of PEGDMA is proved to be critical to the comprehensive performance of the PPLCEs,which effectively modulates the microscopic morphology of polymer networks and improves the mechanical properties as well as cycling stability of the solid electrolyte.When used in a lithium-ion symmetrical battery configuration,the 6 wt％-PPLCE exhibites super stability,sustaining operation for over 2000 h at 30 ℃,with minimal and consistent overpotential of 50 mV.The resulting Li|PPLCE|LFP solid-state battery demonstrates high discharge specific capacities of 160.9 and 120.1 mA h g-1 at current densities of 0.2 and 1 C,respectively.Even after more than 300 cycles at a current density of 0.2 C,it retaines an impressive 73.5％capacity.Moreover,it displayes stable cycling for over 180 cycles at a high current density of 0.5 C.The super cycle stability may promote the application for ultralong-life all solid-state lithium metal batteries.

Solid-state electrolyteLithium-metal batteriesLiquid crystalline polymerCopolymer3D co-continuous structureLong cycle stability

Meng Wang、Hu Zhang、Yewen Li、Ruiping Liu、Huai Yang

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School of Chemical & Environmental Engineering China University of Mining and Technology(Beijing),Beijing 100083,China

Beijing Advanced Innovation Center for Materials Genome Engineering & School of Materials Science and Engineering,Peking University,Beijing 100871,China

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaFundamental Research Funds for the Central UniversitiesBeijing Nova Program

5200329351927806522722582023ZKPYJD0720220484214

2024

10.1016/j.jechem.2024.02.069

能源化学
中国科学院大连化学物理研究所 中国科学院成都有机化学研究所

能源化学

CSTPCDEI
影响因子：0.654
ISSN：2095-4956
年,卷(期)：2024.94(7)