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A flexible, robust, and high ion-conducting solid electrolyte membranes enabled by interpenetrated network structure for all-solid-state lithium metal battery

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Journal of Energy Chemistry 2022年第5期31卷 603-611页

作者： Zhenchuan Tian dukjoon kim School of Chemical Engineering Sungkyunkwan UniversitySuwon 16419Republic of Korea

Poly(vinyl alcohol)/poly(ethylene glycol)(PVA/PEG) semi-interpenetrating networks(s-IPN) were synthesized for the application of solid electrolyte membranes of lithium metal batteries. Thermal, mechanical and dimensional stability, lithium-ion conductivity, interfacial compatibility, and cell performance were evaluated to assure their application. As this s-IPN structure suppressed the crystallinity by formation of network structure, both the lithium-ion conductivity and mechanical strength were simultaneously enhanced. The PVA/PEG-3s-IPN showed the highest lithium-ion conductivity of 3.26 × 10^(-4)S cm^(-1)in a wide electrochemical window(5.8 V vs. Li/Li^(+)), maintaining the robust solid-state with the tensile strength beyond 16.2 MPa at room temperature. The synthesized solid electrolyte membranes exhibited quite high specific capacity over 122 m Ah g^(-1)at 0.1 C from Li|PVA/PEG-3s-IPN|LiFePO_(4) cell and the long-term stable lithium stripping/plating performance for 1000 cycles from Li symmetric cell.

关键词： Solid polymer electrolyte Lithium battery Semi-IPN Lithium-ion conductivity

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Flexible PVA/BMIMOTf/LLZTO composite electrolyte with liquid-comparable ionic conductivity for solid-state lithium metal battery

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Journal of Energy Chemistry 2022年第11期31卷 128-139,I0005页

作者： Hyesun Jeon Hai Anh Hoang dukjoon kim School of Chemical Engineering Sungkyunkwan UniversitySuwonGyeonggi 16419Republic of Korea

Poly(vinyl alcohol)(PVA)/1-butyl-3-methylimidazolium trifluoromethanesulfonate(BMIMOTf)/Li_(6.4)La_(3)Zr_(1.4)Ta_(0.6)O_(12)(LLZTO)solid-state composite electrolyte(SSCE)membranes were synthesized for solid-state lithium metal battery *** garnet-type LLZTO nanoparticles were surface-coated with the polydopamine layer of 8-10 nm thickness to enhance the dispersion status of LLZTO particles in the PVA *** hydrophilic BMIMOTf ionic liquid(IL)was added along with LLZTO nanoparticles to enhance the ionic conductivity and electrochemical stability of the SSCE *** synthesized composite electrolyte membrane containing 7 wt%of LLZTO and 60 wt%of BMIMOTf showed the outstanding Li+conductivity of 2×10^(-3)S cm^(-1)and the lithium transference number of 0.76 at room temperature in the firm and flexible solid state with the tensile strength of 8 *** a high single ion conduction characteristic led to the quite low interfacial resistance of 39Ωbetween the composite electrolyte and the lithium *** to these superior properties of composite membranes,the LiFePO_(4)|SSCE|Li cell exhibited an excellent discharge capacity of 165 mAh g^(-1)at 0.2 C,maintaining the coulombic efficiency of 98%after 100 cycles at room temperature.

关键词： Polymer-matrix composites(PMCs) Interface/interphase Surface treatments Solid-state lithium-ion batteries

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