Developing safe and high-performance solid polymer electrolytes(SPEs) remains a critical challenge for all-solid-state batteries.Among various polymer materials,poly(ethylene oxide)(PEO) is most widely studied,while p...Developing safe and high-performance solid polymer electrolytes(SPEs) remains a critical challenge for all-solid-state batteries.Among various polymer materials,poly(ethylene oxide)(PEO) is most widely studied,while poly(vinylidene fluoride)(PVDF)has also attracted great interest recently.However,the intrinsic disadvantages of single polymers make them hardly meet the demands for practical applications.Physical blending of different types of SPEs is a simple and straightforward strategy to optimize their performance.Unfortunately,the direct blending of PEO and PVDF(or PVDF derivatives) usually leads to macrophase separation and fails to couple together.Herein,we designed and synthesized PEO-based block copolymers as compatibilizers to prevent macroscopic phase separation in PVDF/PEO blends.By tuning the interfacial compatibility,continuous nanostructures with high optical transparency are constructed through the microphase segregation.The obtained SPEs combine the merits of high mechanical modulus(380 MPa),high ionic conductivity(2.0 × 10^(-4)S cm^(-1),30 ℃),large transference number(0.60),and electrochemical stability(4.5 V).This simple and efficient chemical modification approach sheds light on alternative solutions for designing high-performance SPEs.展开更多
基金supported by the State Key Laboratory of Pulp and Paper Engineering (2024ZD06)the Natural Science Foundation of Guangdong Province (2024B1515040023)+2 种基金the National Natural Science Foundation of China (52173005)the GJYC Program of Guangzhou(2024D03J0002)the 111 Project (B18023)。
文摘Developing safe and high-performance solid polymer electrolytes(SPEs) remains a critical challenge for all-solid-state batteries.Among various polymer materials,poly(ethylene oxide)(PEO) is most widely studied,while poly(vinylidene fluoride)(PVDF)has also attracted great interest recently.However,the intrinsic disadvantages of single polymers make them hardly meet the demands for practical applications.Physical blending of different types of SPEs is a simple and straightforward strategy to optimize their performance.Unfortunately,the direct blending of PEO and PVDF(or PVDF derivatives) usually leads to macrophase separation and fails to couple together.Herein,we designed and synthesized PEO-based block copolymers as compatibilizers to prevent macroscopic phase separation in PVDF/PEO blends.By tuning the interfacial compatibility,continuous nanostructures with high optical transparency are constructed through the microphase segregation.The obtained SPEs combine the merits of high mechanical modulus(380 MPa),high ionic conductivity(2.0 × 10^(-4)S cm^(-1),30 ℃),large transference number(0.60),and electrochemical stability(4.5 V).This simple and efficient chemical modification approach sheds light on alternative solutions for designing high-performance SPEs.
