首页|Thin polymer electrolyte with MXene functional layer for uniform Li+deposition in all-solid-state lithium battery

Thin polymer electrolyte with MXene functional layer for uniform Li+deposition in all-solid-state lithium battery

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Solid polymer electrolyte(SPE)shows great potential for all-solid-state batteries because of the inherent safety and flexibility;however,the unfavourable Li+deposition and large thickness hamper its development and application.Herein,a laminar MXene functional layer-thin SPE layer-cathode integration(MXene-PEO-LFP)is designed and fabricated.The MXene functional layer formed by stacking rigid MXene nanosheets imparts higher compressive strength relative to PEO electrolyte layer.And the abundant negatively-charged groups on MXene functional layer effectively repel anions and attract cations to adjust the charge distribution behavior at electrolyte-anode interface.Furthermore,the functional layer with rich lithiophilic groups and outstanding electronic conductivity results in low Li nucleation overpotential and nucleation energy barrier.In consequence,the cell assembled with MXene-PEO-LFP,where the PEO electrolyte layer is only 12 μm,much thinner than most solid electrolytes,exhibits uniform,dendrite-free Li+deposition and excellent cycling stability.High capacity(142.8 mAh g-1),stable operation of 140 cycles(capacity decay per cycle,0.065％),and low polarization potential(0.5 C)are obtained in this Li|MXene-PEO-LFP cell,which is superior to most PEO-based electrolytes under identical condition.This integrated design may provide a strategy for the large-scale application of thin polymer electrolytes in all-solid-state battery.

MXene nanosheetLaminar functional layerThin polymer electrolyteDendrite-free Li+depositionAll-solid-state lithium battery

Weijie Kou、Yafang Zhang、Wenjia Wu、Zibiao Guo、Quanxian Hua、Jingtao Wang

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School of Chemical Engineering,Zhengzhou University,Zhengzhou,450001,China

国家自然科学基金国家重点研发计划中国博士后科学基金河南省自然科学基金Young Talent Support Project of Henan ProvinceCenter for advanced analysis and computational science,Zhengzhou University

U20041992018 YFD02006062021T1406152123004102852021HYTP028

2024

10.1016/j.gee.2022.05.002

绿色能源与环境(英文)

绿色能源与环境(英文)

CSTPCD
ISSN：
年,卷(期)：2024.9(1)
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