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

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作  者:Qianqian Song Yunting Zhang Jianli Liang Si Liu Jian Zhu Xingbin Yan 

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

出  处:《Chinese Chemical Letters》2024年第6期216-221,共6页中国化学快报(英文版)

基  金:financially supported by the National Key R&D Program of China(No.2022YFB2402600);National Natural Science Foundation of China(Nos.22279166,52203346);Basic and Applied Basic Research Foundation of Guangdong Province(Nos.2021A1515110168,2022B1515120019);Basic and Applied Basic Research Foundation of Guangzhou(No.202201011322);Fundamental Research Funds for the Central Universities;Sun Yat-Sen University(Nos.22qntd0101 and 22dfx01);Special Fund of Science and Technology Innovation Cultivation for College Students in Guangdong Province(No.pdjh2021b0022)。

摘  要:Polyethylene oxide(PEO)-based solid-state polymer electrolytes(SPEs)are limited by their poor cyclic stability 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 effectively reduce the crystallinity of the PEO matrix and enhance its ionic conductivity.Moreover,owing to the hardness and good stability of BNNFs,BNNFs/PEO/Li TFSI electrolyte exhibits a wider electrochemical window,better mechanical property and higher thermal stability compared with PEO/Li TFSI electrolyte.Consequently,the Li symmetric cell composed of 1%BNNFs/PEO/Li TFSI performs good cyclic stability(>1800 h),and the Li||1%BNNFs/PEO/Li TFSI||LFP full battery shows obviously improved performances in charge-discharge polarization voltage,discharge specific capacity,rate performance and cyclic stability than the Li||PEO/Li TFSI||LFP battery.

关 键 词:Solid-state polymer electrolyte Boron nitride nanofibers Lithium metal battery Ionic conductivity Li dendrite 

分 类 号:TM912[电气工程—电力电子与电力传动] TB332[一般工业技术—材料科学与工程]

 

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