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
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 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 because lithiumions are not able to pass through six-membered rings of graphene. To prepare LiFePO4/graphene hybrids, some researchers have ultrasonically mixed LiFePO4 Nanoparticles and graphite dioxide. After coating the material with carbon standard, the specific ability of lithium insertion can greatly be improved and maintained at around 70mAh/g, even under high rates of 60C.
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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 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 because lithiumions are not able to pass through six-membered rings of graphene. To prepare LiFePO4/graphene hybrids, some researchers have ultrasonically mixed LiFePO4 Nanoparticles and graphite dioxide. After coating the material with carbon standard, the specific ability of lithium insertion can greatly be improved and maintained at around 70mAh/g, even under high rates of 60C.
Tech Co., Ltd. is a professional graphene provider with more than 12 years of chemical products research, development and design experience. We accept payments via Credit Card and Paypal. We will ship goods overseas via FedEx, DHL and by air or sea to our customers.