首页|Bifunctional TiO2-x nanofibers enhanced gel polymer electrolyte for high performance lithium metal batteries

Bifunctional TiO2-x nanofibers enhanced gel polymer electrolyte for high performance lithium metal batteries

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Exploration of advanced gel polymer electrolytes(GPEs)represents a viable strategy for mitigating den-dritic lithium(Li)growth,which is crucial in ensuring the safe operation of high energy density Li metal batteries(LMBs).Despite this,the application of GPEs is still hindered by inadequate ionic conductivity,low Li+transference number,and subpar physicochemical properties.Herein,TiO2-x nanofibers(NF)with oxygen vacancy defects were synthesized by a one-step process as inorganic fillers to enhance the thermal/mechanical/ionic-transportation performances of composite GPEs.Various characterizations and theoretical calculations reveal that the oxygen vacancies on the surface of TiO2-x NF accelerate the dis-sociation of LiPF6,promote the rapid transfer of free Li+,and influence the formation of LiF-enriched solid electrolyte interphase.Consequently,the composite GPEs demonstrate enhanced ionic conductivity(1.90 mS cm-1 at room temperature),higher lithium-ion transference number(0.70),wider electrochemical sta-bility window(5.50 V),superior mechanical strength,excellent thermal stability(210 ℃),and improved compatibility with lithium,resulting in superior cycling stability and rate performance in both Li‖Li,Li‖LiFePO4,and Li[[LiNi0.8Co0.1Mn0.1O2 cells.Overall,the synergistic influence of nanofiber morphology and enriched oxygen vacancy structure of fillers on electrochemical properties of composite GPEs is compre-hensively investigated,thus,it is anticipated to shed new light on designing high-performance GPEs LMBs.

Nanofibers fillersOxygen vacanciesGel polymer electrolytesLithium metal batteries

Yixin Wu、Zhen Chen、Yang Wang、Yu Li、Chunxing Zhang、Yihui Zhu、Ziyu Yue、Xin Liu、Minghua Chen

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Key Laboratory of Engineering Dielectric and Applications(Ministry of Education),School of Electrical and Electronic Engineering,Harbin University of Science and Technology,Harbin 150080,Heilongjiang,China

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNatural Science Foundation of Heilongjiang Province of China

5212270252277215JQ2021E005

2024

10.1016/j.jechem.2023.09.049

能源化学
中国科学院大连化学物理研究所 中国科学院成都有机化学研究所

能源化学

CSTPCDEI
影响因子：0.654
ISSN：2095-4956
年,卷(期)：2024.89(2)
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