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Enhanced electrochemical performance of LiFePO4@rGO cathodes via 3D conductive architecture and pseudocapacitive contributions
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DOI：10.1007/s11581-026-06992-4.png)
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Abstract
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In this study, two LiFePO4-based composite cathode materials, LiFePO4@C and LiFePO4@rGO, were synthesized and comparatively evaluated to enhance the electrochemical performance of lithium-ion batteries. LiFePO4@C consists of LiFePO4 particles coated with a uniform conductive carbon layer, whereas LiFePO4@rGO employs reduced graphene oxide (rGO) to construct a three-dimensional conductive framework around the active particles. Structural and morphological analyses confirmed good particle dispersion and intimate interfacial contact in both composites. Notably, the LiFePO4@rGO architecture provided more efficient electron and lithium-ion transport pathways. Electrochemical testing demonstrated the superior performance of LiFePO4@rGO, which delivered a reversible capacity of 181 mAh & centerdot;g(-)& sup1; at 0.1 C, exceeding the theoretical capacity of pristine LiFePO4. This enhancement is ascribed to additional pseudocapacitive contributions and reversible Li+ storage on rGO surfaces. Moreover, the LiFePO4@rGO electrode exhibited outstanding rate capability up to 10 C and excellent cycling stability, retaining 95.8% of its capacity after 1000 cycles at 5 C. Importantly, LiFePO4@rGO achieved a lithium-ion diffusion coefficient of 8.57 & times; 10(-)(11) cm(2)& centerdot;s(-)(1), significantly higher than values reported for comparable systems, further confirming the role of rGO in accelerating Li+ kinetics. These findings highlight the synergistic effect of rGO integration and position LiFePO4@rGO as a highly promising cathode material for high-rate and long-life lithium-ion batteries.
Keywords:
LiFePO4
Reduced graphene oxide
Coating
Cathode materials
Lithium-ion batterie
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