Simultaneous Improvement of Ionic Conductivity and Mechanical Strength in Block Copolymer Electrolytes with Double Conductive Nanophases

被引：34

作者：

Cao, Xiao-Han ^{[1
]}

Li, Jun-Huan ^{[1
]}

Yang, Mu-Jia ^{[1
]}

Yang, Jia-Liang ^{[1
]}

Wang, Rui-Yang ^{[1
]}

Zhang, Xing-Hong ^{[1
]}

Xu, Jun-Ting ^{[1
]}

机构：

[1] Zhejiang Univ, Dept Polymer Sci & Engn, MOE Key Lab Macromol Synth & Functionalizat, Hangzhou 310027, Peoples R China

来源：

MACROMOLECULAR RAPID COMMUNICATIONS | 2020年 / 41卷 / 07期

基金：

中国国家自然科学基金;

关键词：

block copolymers; ionic conductivity; mechanical properties; polymer electrolytes; POLYMER ELECTROLYTES; MICROPHASE SEPARATION; MOLECULAR-WEIGHT; ORDER-DISORDER; PHASE-BEHAVIOR; TRANSPORT;

D O I：

10.1002/marc.201900622

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

The most daunting challenge of solid polymer electrolytes (SPEs) is the development of materials with simultaneously high ionic conductivity and mechanical strength. Herein, SPEs of lithium bis-(trifluoromethanesulfonyl)imide (LiTFSI)-doped poly(propylene monothiocarbonate)-b-poly(ethylene oxide) (PPMTC-b-PEO) block copolymers (BCPs) with both blocks associating with Li+ ions are prepared. It is found that the PPMTC-b-PEO/LiTFSI electrolytes with double conductive phases exhibit much higher ionic conductivity (2 x 10(-4) S cm(-1) at r.t.) than the BCP electrolytes with a single conductive phase. Concurrently, the storage moduli of PPMTCn-b-PEO44/LiTFSI electrolytes are approximate to 1-4 orders of magnitude higher than that of the neat PEO/LiTFSI electrolytes. Therefore, simultaneous improvement of ionic conductivity and mechanical properties is achieved by construction of a microphase-separated and disordered structure with double conductive phases.

引用

页数：6

共 36 条

[21] Discontinuous Changes in Ionic Conductivity of a Block Copolymer Electrolyte through an Order-Disorder Transition [J].