Enhanced ionic conductivity and interface compatibility of PVDF-LLZTO composite solid electrolytes by interfacial maleic acid modification
Journal of colloid and interface science(2022)
摘要
Improving conductivity and optimizing interface contact are two primary targets to promote the development of solid-state electrolytes. Herein, maleic acid (MA) is introduced into normal PVDF-LLZTO (Li6.75La3Zr1.75Ta0.25O12) based composite polymer-ceramic electrolytes (CPEs). Benefiting the self-polymerization of MA, a core-shell structure is spontaneously formed with LLZTO as core and MA nano-film as shell, the MA shell builds a bridge to link LLZTO and PVDF. In addition, carboxyl groups in MA provide extra channels for Li+ transmission. As a proof, the optimized 25MA-75PVDF-LLZTO CPEs demonstrates an enhanced conductivity as high as 1.15 x 10(-3) S cm(-1) at 30 degrees C, an extended electrochemical window up to < 5.0 V, a raised Li+ transfer number of 0.596, and an improved compatibility with Li metal anode. The as-prepared Li parallel to 25MA-75PVDF-LLZTO CPEs parallel to LiFePO4 full cell delivers an initial specific discharge capacity of 170.5 mAh g(-1) at 0.2C, a high rate capability up to 1.0C with 138 mAh g(-1) and an excellent long-term cycling stability of over 180cycles without capacity attenuation. The work provides a new strategy to optimize solid state lithium batteries by introducing unsaturated small organic molecules. (C) 2022 Elsevier Inc. All rights reserved.
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关键词
Solid-state lithium batteries,Composite polymer-ceramic electrolytes,Conductivity,PVDF,LLZTO,Maleic acid
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