减缓自由阴离子迁移以缓解浓差极化用于高性能的聚合物锂金属电池  

Retarding anion migration for alleviating concentration polarization towards stable polymer lithium-metal batteries

作　　者：崔满营 秦棪阳 李智超 赵洪洋 刘理民 江智元 曹振江 赵坚蕴 毛博阳 于伟 苏亚琼 RVasant Kumar 丁书江 屈治国 郗凯 Manying Cui;Yanyang Qin;Zhichao Li;Hongyang Zhao;Limin Liu;Zhiyuan Jiang;Zhenjiang Cao;Jianyun Zhao;Boyang Mao;Wei Yu;Yaqiong Su;R.Vasant Kumar;Shujiang Ding;Zhiguo Qu;Kai Xi(School of Chemistry,Engineering Research Center of Energy Storage Materials and Devices,Ministry of Education,National Innovation Platform(Center)for Industry-Education Integration of Energy Storage Technology,State Key Laboratory for Electrical Insulation and Power Equipment,Xi’an Jiaotong University,Xi’an 710049,China;MOE Key Laboratory of Thermo-Fluid Science and Engineering,School of Energy and Power Engineering,Xi’an Jiaotong University,Xi’an 710049,China;School of Chemical Engineering and Technology,Xi’an Jiaotong University,Xi’an 710049,China;Department of Engineering,University of Cambridge,Cambridge CB30FA,UK;Department of Materials Science and Metallurgy,University of Cambridge,Cambridge CB30FS,UK)

机构地区：[1]School of Chemistry,Engineering Research Center of Energy Storage Materials and Devices,Ministry of Education,National Innovation Platform(Center)for Industry-Education Integration of Energy Storage Technology,State Key Laboratory for Electrical Insulation and Power Equipment,Xi’an Jiaotong University,Xi’an 710049,China [2]MOE Key Laboratory of Thermo-Fluid Science and Engineering,School of Energy and Power Engineering,Xi’an Jiaotong University,Xi’an 710049,China [3]School of Chemical Engineering and Technology,Xi’an Jiaotong University,Xi’an 710049,China [4]Department of Engineering,University of Cambridge,Cambridge CB30FA,UK [5]Department of Materials Science and Metallurgy,University of Cambridge,Cambridge CB30FS,UK

出　　处：《Science Bulletin》2024年第11期1706-1715,共10页科学通报（英文版）

基　　金：supported by the National Natural Science Foundation of China (52273081 and 22278329);the Natural Science Basic Research Program of Shaanxi (2022TD-27 and 2020-JC-09);Qin Chuangyuan Talent Project of Shaanxi Province (OCYRCXM2022-308);the State Key Laboratory for Electrical Insulation and Power Equipment (EIPE23125);the “Young Talent Support Plan” of Xi’an Jiaotong University。

摘　　要：Traditional dual-ion lithium salts have been widely used in solid polymer lithium-metal batteries(LMBs).Nevertheless, concentration polarization caused by uncontrolled migration of free anions has severely caused the growth of lithium dendrites. Although single-ion conductor polymers(SICP) have been developed to reduce concentration polarization, the poor ionic conductivity caused by low carrier concentration limits their application. Herein, a dual-salt quasi-solid polymer electrolyte(QSPE), containing the SICP network as a salt and traditional dual-ion lithium salt, is designed for retarding the movement of free anions and simultaneously providing sufficient effective carriers to alleviate concentration polarization. The dual salt network of this designed QSPE is prepared through in-situ crosslinking copolymerization of SICP monomer, regular ionic conductor, crosslinker with the presence of the dual-ion lithium salt,delivering a high lithium-ion transference number(0.75) and satisfactory ionic conductivity(1.16 × 10^(-3) S cm^(-1) at 30 ℃). Comprehensive characterizations combined with theoretical calculation demonstrate that polyanions from SICP exerts a potential repulsive effect on the transport of free anions to reduce concentration polarization inhibiting lithium dendrites. As a consequence, the Li||LiFePO_4 cell achieves a long-cycle stability for 2000 cycles and a 90% capacity retention at 30 ℃. This work provides a new perspective for reducing concentration polarization and simultaneously enabling enough lithiumions migration for high-performance polymer LMBs.

关 键 词：Polymer electrolyte Concentration polarization Energy storage materials Ion transport regulation Lithium-metal battery 

分 类 号：TM912[电气工程—电力电子与电力传动]