Graphene coating modified separator for Li metal batteries

Fan YU, Zhenzhen DU, Jun WANG, Jiongli LI, Xudong WANG

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Journal of Materials Engineering ›› 2025, Vol. 53 ›› Issue (7) : 182-190. DOI: 10.11868/j.issn.1001-4381.2024.000482
RESEARCH ARTICLE

Graphene coating modified separator for Li metal batteries

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Abstract

Separator modification represents a prevalent approach to inhibiting lithium dendrite growth and enhancing battery safety. In this study， lithium metal serves as the negative electrode， LiFePO4 as the cathode， and a graphene coating modified polypropylene separator is employed. Lithium batteries are assembled and undergo rigorous testing， including cycling tests， rate capability tests， electrochemical impedance spectroscopy （EIS） measurements， and morphological analysis of the lithium negative electrode before and after cycling. The primary focus is to investigate the influence of positioning the graphene coating towards either the cathode or the negative electrode on battery performance. Cycle performance results indicate that when the graphene coating faces the negative electrode， the battery exhibits an initial discharge-specific capacity of 168 mAh/g at 0.2 C. After enduring 500 cycles， the discharge-specific capacity remains stable at 154 mAh/g， yielding a capacity retention rate of 91.67%. EIS analysis further reveals that the battery with the graphene coating oriented towards the negative electrode exhibits decreased interfacial resistance and improved reaction kinetics. Moreover， the surface of the cycled lithium negative electrode remains smooth and uniform， devoid of significant lithium dendrite formation. Consequently， lithium batteries configured with the graphene coating facing the negative electrode demonstrate superior cycle performance and heightened safety.

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modified separator / graphene / lithium battery / dendrite

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Fan YU , Zhenzhen DU , Jun WANG , et al . Graphene coating modified separator for Li metal batteries. Journal of Materials Engineering. 2025, 53(7): 182-190 https://doi.org/10.11868/j.issn.1001-4381.2024.000482

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