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There are many raw materials in the production of lithium-ion battery pack. The key materials of lithium-ion battery pack include: positive material, negative material, diaphragm and electrolyte. Lithium-ion battery is a new generation of green high-energy battery with excellent performance, and has become one of the focuses of high-tech development. At present, the supply of raw materials for lithium-ion battery pack is sufficient, and the output of some products is sufficient, and the competition is fierce. The lithium-ion battery industry is still hot.

The production of raw materials for lithium-ion battery packs is generally in surplus at the middle and low end and the supply of high-end products is in short supply. Among them, positive materials, negative materials and electrolyte have gradually become self-sufficient. Due to the relatively low technical barriers of negative materials and electrolyte, the cost advantages of Chinese companies are clearly strong competitiveness in the world.

1. Positive electrode material

Among the cathode materials, the most commonly used materials are lithium cobaltate, lithium manganate, lithium iron phosphate and ternary materials (nickel cobalt manganese polymer). Positive electrode materials account for a large proportion (the mass ratio of positive and negative electrode materials is 3:1~4:1), because the performance of positive electrode materials directly affects the performance of lithium-ion batteries, and its cost directly determines the cost of batteries.

The cathode material of lithium ion battery pack has a broad market and a very optimistic prospect. However, there are still some technical bottlenecks in the cathode materials of lithium-ion batteries, especially its advantages of high capacitance and strong safety performance have not been fully developed. Chinese companies should strengthen the research and development of key technologies of positive electrode materials, gain international leading position, strengthen core competitiveness and gain advantages in international competition.

2. Negative electrode material

Among the anode materials, natural graphite and artificial graphite are the main anode materials at present. The anode materials being explored include nitride, PAS, tin-based oxide, tin alloy, nano anode materials, and some other intermetallic compounds. As one of the four major components of lithium-ion battery pack, the negative electrode material plays an important role in improving the capacity and cycle performance of the battery, and is at the core of the mid-stream of the lithium-ion battery industry.

3. Diaphragm

The commercialized diaphragm material is the polyolefin diaphragm mainly composed of polyethylene and polypropylene. In the structure of lithium-ion battery, the diaphragm is one of the key inner components. The performance of the separator determines the interface structure and internal resistance of the battery. Straightness affects the capacity, cycle and safety performance of the battery. The separator with excellent performance is of vital use for improving the comprehensive performance of the lithium-ion battery pack.

4. Electrolyte

The electrolyte of lithium ion battery is the carrier of ion transport in the battery. It is generally made of high-purity organic solvent, lithium electrolyte, necessary additives and other raw materials under certain conditions and in a certain proportion. Electrolyte is used to conduct ions between the positive and negative electrodes of lithium-ion battery pack, which is the guarantee for lithium-ion battery to obtain high voltage, high specific energy and other advantages.

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