Graphite is an older negative electrode material. Graphite is a more desirable negative electrode material than carbon materials. Its conductivity, crystallinity, and good layered structure are all better than those of other carbon materials.
Modifications: Optimize anode material performance
Graphite Negative Electrodes generally use natural flake graphite. But there are a few drawbacks.
(1) Flake graphite has a large surface area which has a greater influence on the first charge of the negative electrode and its discharge efficiency.
(2) Because graphite is layered, Li+ can only penetrate the material’s end and slowly 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 layer spacing in graphite 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 like surface oxidation and surface fluorination, particle spheroidization, microstructure adjustment, surface coating with hard carbon and soft carbon, and other methods. After taking into account cost and performance, industrial graphite modification is primarily based on carbon coating. The specific capacity of modified natural graphite for commercial use has been lowered to 340-370mA*h/g. There is a coulombic efficiency at 90%-93% within the first week. Additionally, the DOD cycle time of over 1,000 times can be achieved, which can meet the requirements of small consumer electronics 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, longer life, and high power density. 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), and spheroidized 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 battery’s performance. Graphene is widely used as a positive electrode, negative electrode, current collector, separator, and conductive addition in lithium-ion cells. Future market opportunities are very broad and the current focus of research is graphene. 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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