Graphite is an older negative electrode material. It is a more desirable negative electrode material than carbon materials in conductivity and crystallinity.
Modifications: Enhance the performance and efficiency of anode material
Graphite Negative Electrodes generally use natural flake graphite. But there are a few drawbacks.
(1) Flake graphite has a large surface area which can have a greater effect on the first charge of the negative electrode and its discharge efficiency.
(2) The graphite layer structure determines that Li+ cannot penetrate the material’s end and diffuse into the particles. Flake graphite has an anisotropy that makes the Li+ diffusion path long and uneven. This causes a low specific ability.
(3) The graphite’s layer spacing is too small. This increases Li+’s diffusion resistance, but also makes it less efficient at delivering high rates of charge. Li+ can be easily deposited on graphite’s surface and formed lithium dendrites, which poses serious safety hazards.
Natural graphite can be modified to address these issues using technologies such as surface oxidation and surface fluorination. After taking into account cost and performance, industrial graphite modification is primarily based on carbon coating. Modified natural graphite is a commercially available material with a specific capacity between 340 and370 mA*h/g. This has a coulombic efficiency in excess of 93% in the first week. The DOD cycle time of over 1,000 times can also be used to supply small electronic products. Specific requirements for battery performance.
Innovation: Tap the Potential of Graphite Applications
People are continuously aiming to improve the performance of lithium-ion battery technology, with a focus on higher energy density and long life. This results in a higher graphite-anode requirement.
Graphite concentrate is able to be further processed to make graphite products. These include graphene (spheroidized graphite), flexible graphite (fluorinated graphite), nuclear graphite or silicon-impregnated graphite), flexible graphite (spheroidized graphite), flexible graphite (flexible graphite), fluorinated graphite and nuclear graphite. This will allow graphite to be used in lithium batteries at a higher level. Graphene is a good conductor and can help reduce volume expansion in electrode materials. This will greatly increase the power batteries’ performance. Graphene is commonly used in lithium-ion’s negative and positive electrodes. Current collectors, separators and conductive additives are all examples of graphene. The future market opportunities are very broad, so it is the center of current research. Spherical graphite features good electrical conductivity and high crystallinity. It can be used to replace negative electrode materials in the production of lithium-ion cells at home and abroad.
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