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Self‐Standing Highly Conductive Solid Electrolytes Based on Block Copolymers for Rechargeable All‐Solid‐State Lithium‐Metal Batteries
Author(s) -
Aldalur Itziar,
MartinezIbañez Maria,
Piszcz Michal,
Zhang Heng,
Armand Michel
Publication year - 2018
Publication title -
batteries and supercaps
Language(s) - English
Resource type - Journals
ISSN - 2566-6223
DOI - 10.1002/batt.201800048
Subject(s) - materials science , electrolyte , ionic conductivity , chemical engineering , copolymer , lithium (medication) , faraday efficiency , polymer , fast ion conductor , electrode , electrochemistry , ionic bonding , polystyrene , nanotechnology , composite material , ion , chemistry , organic chemistry , medicine , engineering , endocrinology
Solid polymer electrolytes (SPEs) have been emerging as attractive candidates for meeting the demand in safe and high energy density batteries, attributed to their low flammability and ease in process. The architectural design of polymer matrices can improve the physicochemical and electrochemical properties of SPEs, thus leading to an enhanced performance of rechargeable all‐solid‐state lithium metal (Li 0 ) batteries (ASSLMBs). However, for the majority of the reported SPEs, high ionic conductivities are achieved at the expense of their mechanical stiffness that is crucial for the processing of ASSLMBs. Herein, we report a new type of self‐standing and highly conductive SPE based on tailor‐made block copolymers, containing highly flexible Jeffamine‐based blocks and mechanically stable polystyrene moieties. The synthesis is facile and “one‐pot”. The electrolytes exhibit good mechanical properties and high ionic conductivities (5.6×10 −4 S cm −1 at 70 °C and 7.9×10 −5 S cm −1 at 40 °C). The superior compatibility with Li 0 electrode allows the electrolyte to be cycled in a Li 0 ||LiFePO 4 cell with good coulombic efficiency and low capacity fading. The tailor‐made block copolymers offer a potential entry to safe and high‐performance ASSLMBs.