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The negative electrode of lithium-ion batteries is made by mixing the negative electrode active material carbon or non carbon materials, adhesives, and additives to form a paste like adhesive that is evenly applied on both sides of the copper foil, and then dried and rolled. The key to the successful production of lithium-ion batteries lies in the preparation of negative electrode materials that can reversibly remove/insert lithium ions. At present, the negative electrode materials used in lithium-ion batteries are generally carbon materials, such as graphite, soft carbon (such as coke), hard carbon, etc. The negative electrode materials being explored include nitrides, PAS, tin based oxides, tin alloys, nano negative electrode materials, as well as some other intermetallic compounds.

Choosing a good negative electrode material should follow the following principles: high specific energy; The electrode potential is relatively low compared to lithium electrodes; The reversibility of charge discharge reaction is good; Good compatibility with electrolytes and adhesives; Small specific surface area (<10m2/g), high true density (>2.0g/cm3); Good dimensional and mechanical stability during lithium insertion process; Rich resources and low prices; Stable and non-toxic in the air.

Regarding the positive electrode materials for lithium batteries: Currently, the marketed positive electrode materials for lithium batteries include lithium cobalt oxide, lithium manganese oxide, lithium iron phosphate, and ternary materials. Positive electrode materials account for over 40% of the total cost of lithium-ion batteries, and their performance directly affects various performance indicators of lithium-ion batteries. Therefore, lithium-ion positive electrode materials occupy a core position in lithium-ion batteries. Although lithium battery cathode materials have a broad market, the prospects are very optimistic. However, there are still certain technological bottlenecks in the positive electrode materials of lithium batteries, especially their advantages of high capacitance and strong safety performance have not been fully utilized.

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