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Graphene Nanoplatelet Additives for High C-rate LiFePO4 Battery Cathodes

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Abstract

Graphene nanoplatelets (GNPs) were introduced as conductive additives in the lithium iron phosphate (LiFePO4) composite cathode material through a facile slurry approach to study the effect on battery performance at high current rates (C-rates). The incorporation of GNPs helps to create a flexible three-dimensional conductive network through a plane-to-point connection with the LiFePO4 particles. Comparison electrochemical testing showed that the LiFePO4/GNP cathode exhibited a high specific discharge capacity of ~ 153 mAh g−1 at 0.1C, improved high C-rate performance, and enhanced electrochemical reactivity. The enhanced LiFePO4/GNP battery performance can be attributed to the better electronic transport properties facilitated by the capability of GNP to bridge multiple LFP particles owing to its larger surface area. Our results inform the ongoing effort in finding LiFePO4 cathodes that can perform at high current rates as the demand increases for lithium-ion battery usage.

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Acknowledgements

This work was supported by the National Science Foundation PREM (Grant No. 1205608) via the Howard University Partnership for Reduced Dimensional Materials and a Howard University Department of Physics and Astronomy start-up fund. Special thanks to the Army Research Lab (ARL), Adelphi, MD, for access to the Gamry Instruments potentiostat used in this work.

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  1. Department of Physics and Astronomy, Howard University, Washington, DC, 20059, USA

    Adewale A. Adepoju, Mohamed Doumbia & Quinton L. Williams

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  1. Adewale A. Adepoju
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  2. Mohamed Doumbia
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  3. Quinton L. Williams
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Correspondence to Quinton L. Williams.

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Adepoju, A.A., Doumbia, M. & Williams, Q.L. Graphene Nanoplatelet Additives for High C-rate LiFePO4 Battery Cathodes. JOM 72, 3170–3175 (2020). https://doi.org/10.1007/s11837-020-04224-2

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