Boron nitride nanofibers enhanced composite PEO-based solid-state polymer electrolytes for lithium metal batteries

Qianqian Song ¹Yunting Zhang ²Jianli Liang ³Si Liu ⁴Jian Zhu ²Xingbin Yan²

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作者信息

1. School of Materials Science and Engineering,Sun Yat-Sen University,Guangzhou 510275,China;College of Physics and Materials Science,Tianjin Normal University,Tianjin 300387,China
2. School of Materials Science and Engineering,Sun Yat-Sen University,Guangzhou 510275,China
3. Department of Chemistry & Center of Super-Diamond and Advanced Films(COSDAF),City University of Hong Kong,Hong Kong 999077,China
4. School of Materials Science and Engineering,Sun Yat-Sen University,Guangzhou 510275,China;Guangdong-Hong Kong-Macao Joint Laboratory for Intelligent Micro-Nano Optoelectronic Technology,School of Physics and Optoelectronic Engineering,Foshan University,Foshan 528225,China
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Abstract

Polyethylene oxide(PEO)-based solid-state polymer electrolytes(SPEs)are limited by their poor cyclic sta-bility and inferior ionic conductivity for applicating in high-safety,long-cycling and high-energy-density lithium metal batteries.Herein,porous boron nitride nanofibers(BNNFs)are filled into PEO-based SPE,which significantly suppresses Li dendrites growth and enhances the electrochemical performance of Li metal battery.BNNFs with high porosity have more active sites to connect with PEO,which can effec-tively reduce the crystallinity of the PEO matrix and enhance its ionic conductivity.Moreover,owing to the hardness and good stability of BNNFs,BNNFs/PEO/LiTFSI electrolyte exhibits a wider electrochemical window,better mechanical property and higher thermal stability compared with PEO/LiTFSI electrolyte.Consequently,the Li symmetric cell composed of 1％BNNFs/PEO/LiTFSI performs good cyclic stability(＞1800 h),and the Li||1％BNNFs/PEO/LiTFSI||LFP full battery shows obviously improved performances in charge-discharge polarization voltage,discharge specific capacity,rate performance and cyclic stability than the Li||PEO/LiTFSI||LFP battery.

Key words

Solid-state polymer electrolyte/Boron nitride nanofibers/Lithium metal battery/Ionic conductivity/Li dendrite

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基金项目

National Key R&D Program of China(2022YFB2402600)

National Natural science Foundation of China(22279166)

National Natural science Foundation of China(52203346)

Basic and Applied Basic Research Foundation of Guangdong Province(2021A1515110168)

Basic and Applied Basic Research Foundation of Guangdong Province(2022B1515120019)

Basic and Applied Basic Research Foundation of Guangzhou(202201011322)

Fundamental Research Funds for the Central Universities,Sun Yat-Sen University(22qntd0101)

Fundamental Research Funds for the Central Universities,Sun Yat-Sen University(22dfx01)

Special Fund of Science and Technology Innovation Cultivation for College Students in Guangdong Province(pdjh2021b0022)

出版年

2024

中国化学快报(英文版)

中国化学会

中国化学快报(英文版)

CSTPCD

影响因子：0.771

ISSN：1001-8417

参考文献量2

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