首页|基于全同源策略构建低界面阻抗的柔性固态锂离子电池

基于全同源策略构建低界面阻抗的柔性固态锂离子电池

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固态锂离子电池被认为是可穿戴电子设备的理想储能器件.然而,高的电极/电解质界面阻抗仍是该领域一个严峻的挑战,尤其在弯曲变形条件下.本文提出全同源策略,利用热塑性聚氨酯作为固态电解质和电极的离子导电框架,构建具有低界面阻抗的柔性固态锂离子电池.实验结果表明,聚氨酯中-C=O、-NH和-C-O-C-等功能基团有助于锂离子传输.利用该特性,制备出具有高柔韧性和离子电导率的聚氨酯基固态电解质,以及具有优异柔韧性的复合电极,其即使在不同形变下仍能保持良好的电化学性能.在此基础上,成功组装了全同源的柔性固态锂离子电池,其表现出更低的界面阻抗和更优异的电化学性能.这种全同源策略为柔性固态电池的设计提供了一种新思路.
An all-from-one strategy to flexible solid-state lithium-ion batteries with decreased interfacial resistance
Solid-state lithium-ion batteries(SSLIBs)are recognized ideal energy storage devices in wearable electronics due to their instinctive safety and high energy density.How-ever,the reduction of electrode/electrolyte interfacial re-sistance still remains challenges.Here,we report an all-from-one strategy to decrease interfacial resistance of SSLIBs by introducing thermoplastic polyurethane(TPU)as a highly ionic conductive scaffold for both flexible electrodes and solid-state electrolytes.It was demonstrated that the functional groups(-C=O,-NH,and-C-O-C-groups)of the TPU fa-cilitate Li-ion transport.With this feature,TPU-based solid-state electrolytes and composite electrodes with impressive flexibility were facilely fabricated via a scalable tape-casting strategy.The typical TPU-based solid-state electrolyte exhibits excellent flexibility and high ionic conductivity of 1.20×10-4 S cm-1 at room temperature.The resultant compo-site cathode/anode provides impressive mechanical flexibility to maintain acceptable electrochemical performance even under various deformations.These comprehensive attributes enable the successful assembly of all-from-one flexible SSLIBs,in which the interfacial adhesion between the electrode and solid-state electrolyte was significantly reinforced since the compatibility in the similar material structure.Consequently,the as-obtained all-from-one SSLIB shows reduced interfacial resistances and can operate at 0.3 C with a Coulombic effi-ciency exceeding 99％,surpassing the performance of con-ventional SSLIBs.This all-from-one strategy offers a promising route for the configuration design of flexible SSLIBs.

lithium-ion batteriesall-from-one structure designpolymer solid-state electrolyteflexible free-standing electrodelow interfacial resistance

邹俊龙、张珺、王琳琳、孙琪玥、王泳茵、郑明涛、胡航、肖勇、刘应亮、梁业如

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Key Laboratory for Biobased Materials and Energy of Ministry of Education,College of Materials and Energy,South China Agricultural University,Guangzhou 510642,China

Maoming Branch,Guangdong Laboratory of Lingnan Modern Agriculture,Maoming 525000,China

lithium-ion batteries all-from-one structure design polymer solid-state electrolyte flexible free-standing electrode low interfacial resistance

projects of the National Natural Science Foundation of ChinaIndependent Research Project of Maoming Laboratory

523730742022ZD002

2024

10.1007/s40843-024-2913-8

中国科学:材料科学(英文)

中国科学:材料科学(英文)

CSTPCD
ISSN：
年,卷(期)：2024.67(5)
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