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

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外文摘要：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 devel-oped to reduce concentration polarization,the poor ionic conductivity caused by low carrier concentra-tion 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 polariza-tion.The dual salt network of this designed QSPE is prepared through in-situ crosslinking copolymeriza-tion 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‖LiFePO4 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 lithium-ions migration for high-performance polymer LMBs.

外文关键词：

Polymer electrolyteConcentration polarizationEnergy storage materialsIon transport regulationLithium-metal battery

作者：

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

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作者单位：

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

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基金：

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNatural Science Basic Research Program of ShaanxiNatural Science Basic Research Program of ShaanxiQin Chuangyuan Talent Project of Shaanxi ProvinceState Key Laboratory for Electrical Insulation and Power Equipmentthe"Young Talent Support Plan"of Xi'an Jiaotong University

项目编号：

52273081222783292022TD-272020-JC-09OCYRCXM-2022-308EIPE23125

出版年：

2024

DOI：

10.1016/j.scib.2024.03.048

科学通报(英文版)

中国科学院

科学通报(英文版)

CSTPCD

ISSN：1001-6538

年,卷(期)：2024.69(11)