Graphite, an older negative electrode material, is a good example. Comparable to other carbon materials its conductivity is higher and crystallinity is greater. Its good layered structure, charge-dischargevolt are all very useful for de-embedding the positive electrode material.
Modifications: Optimize performance of anodematerials
Graphite electrodes with negative graphite use generally natural flake graphite. But there are some shortcomings.
(1) Flake graphite has a high specific area which is more effective in reducing the initial charge and the discharge efficiency of the positive electrode.
(2) The graphite layer structure determines that Li+ is only able to be embedded at the material’s end and diffuse slowly 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+ forms lithium dendrites easily on graphite’s surface, and is therefore easy to deposit during fast charging.
Natural graphite may be altered by techniques such as surface oxidation and surface fluorination. After taking into consideration cost, performance and other factors, industrial graphite modification uses a carbon coating process. A commercial application of modified graphite is capable of producing a specific amount of 340-337mA*h/g. The coulombic efficiency for the first week is 93%-93%. There’s also a DOD cycle time of over 1,000 times. This can meet most consumer electronic products. Specific requirements regarding battery performance.
Innovation: Tap the Potential of Graphite Applications
People are continuously aiming for the next technological direction with lithium-ion cells, which is aiming to achieve higher energy density, greater power density, and longer lifespan. This results in a greater graphite-anode requirement.
Graphite concentrate may be further processed in order to produce graphite products like graphene. This will allow graphite to be utilized in lithium battery applications at a higher level. One example is graphene, which has an excellent conductivity, can help reduce volume expansion in electrode materials, greatly increasing the efficiency of power batteries. Graphene is used extensively in the lithium-ion’s negative and positive electrodes. Current collectors, separators and conductive additives are all examples of graphene. The market outlook for the future is very broad. This research area is currently at its center. Spherical graphite features good electrical conductivity. It can be used to replace negative electrode material in the manufacture of lithium-ion cells at home or abroad.
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