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The unique physical and chemical characteristics of graphene make graphene a great candidate for research in the area of electrode material development. Different application areas can be broken down into three main categories for graphene use in lithium-ion cells: graphene application in cathode and anode materials as well as other uses.
Application to graphene in cathode material
For lithium-ion battery, the cathode material must possess the following characteristics: large reversible power, high and steady potential, non-toxicity, low cost of production, and high reversibility. LiFePO4 (low lithium ion mobility) and lithium iron phosphate are the most popular cathode materials used for lithium-ion cells. It is possible to improve the conductivity and rate performance of LiFePO4 materials by adding graphene.
A lack of research on graphene material positive electrodes is due to its uniqueness. Research has shown that hydrothermal methods of covering graphene directly on LiFePO4 surfaces to create composite materials have a poor rate of performance improvement. It could be because graphene structure is destroyed or stacked.
The study showed that half-wrapping LiFePO4 in graphene can improve its conductivity. But, it decreases the ion transmission effectiveness after full-wrapping it. This could be because lithiumions cannot pass through six-membered rings of graphene. To prepare LiFePO4/graphene hybrids, some researchers have ultrasonically mixed LiFePO4 Nanoparticles with graphite dioxide. The specificity of lithium insertion can now be significantly increased after the material has been further coated with carbon. This can still be maintained at approximately 70mAh/g at a high rate of 60C.

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