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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-discharge potential and excellent layered structure make it a great negative electrode material.
Modifications: Enhance performance of anodematerials
Graphite electrodes with negative graphite use natural flake graphite. But there are some limitations.
(1) Flake graphite has a high specific surface area which can have a significant impact on first charge efficiency and discharge efficiency of negative electrodes.
(2) Because of its layer structure graphite, 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 layer spacing is very small which reduces the Li+’s diffusion resistance and makes it less efficient at delivering high rates of charge. Li+ forms lithium dendrites easily on the graphite’s surface, which can pose serious safety concerns.
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 and long life. 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 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. conductive adds. Future market prospects for graphene are very broad. This is why current research is focusing on it. 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.
Lempotee Advanced Material Tech Co., Ltd. is a leading supplier of graphite powder with more than 12 years’ experience in chemical product research and development. You can pay by credit card, T/T and Paypal. Trunnano ships goods by FedEx or DHL to overseas customers by air and sea.
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