Application of graphene in lithium-ion batteries

The unique physical and chemical characteristics of graphene make graphene a great candidate for research in the area of electrode material development. According to various application areas, graphene can be divided into the following three categories: graphene application in lithium-ion cells, graphene application in anode material, and other uses in lithium-ion lithium-ionbatteries.

Application to graphene in cathode material

The applicable cathode materials for lithium-ion battery batteries should have high reversible potential, stable potential, nontoxicity, low cost of production, and large reversible power. 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 due to the six-membered structure of graphene, which makes it difficult for lithium ions to pass through. To prepare LiFePO4/graphene hybrids, some researchers have ultrasonically mixed LiFePO4 Nanoparticles and graphite dioxide. The specificity of lithium insertion is significantly increased after the material has been coated with conventional carbon. This can still be maintained at approximately 70mAh/g, even under high rates of 60C.

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