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Application to graphene in cathode material
The applicable cathode materials for lithium-ion battery batteries should have high reversible potential, stable potential, nontoxicity, and low cost of production. 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 increase the conductivity, but that it decreases the ion transmission effectiveness after full-wrapping. This could be due to lithium ions not being able to pass through six-membered rings of graphene. To prepare LiFePO4/graphene hybrids, some researchers have ultrasonically mixed LiFePO4 Nanoparticles and graphite dioxide. The specificity of the lithium insertion is significantly increased after the material has been further coated with carbon. This can still be maintained at approximately 70mAh/g under high rates of 60C.
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