The four most important materials in a lithium-ion battery are: cathode material, anode material, separator, and electrolyte.
In recent years, a series of policies related to lithium-ion batteries have been introduced, prompting a surge in the establishment of companies across the industry. Cathode materials account for more than 40% of the total cost of lithium-ion batteries, and their performance directly affects various performance indicators of the battery. Therefore, among the four main materials, lithium-ion battery cathode materials hold a core position.
Among cathode materials, the most commonly used materials are lithium cobalt oxide, lithium manganese oxide, lithium iron phosphate, and ternary materials (polymers of nickel, cobalt, and manganese). Cathode materials account for a large proportion because their performance directly affects the performance of lithium-ion batteries, and their cost directly determines the cost of the battery.
Currently, the main anode materials are natural graphite and artificial graphite. Anode materials under investigation include nitrides, PAS, tin-based oxides, tin alloys, nanomaterials, and other intermetallic compounds. As one of the four major components of lithium-ion batteries, anode materials play a crucial role in improving battery capacity and cycle performance, and are a core link in the midstream of the lithium-ion battery industry.
Among separator materials, polyolefin separators, primarily made of polyethylene and polypropylene, are the most common. In the structure of lithium-ion batteries, the separator is one of the key internal components. The performance of the separator determines the battery's interface structure, internal resistance, and other characteristics, directly affecting the battery's capacity, cycle life, and safety performance. High-performance separators are crucial for improving the overall performance of the battery.
In electrolyte materials, the main components are ethylene carbonate, propylene carbonate, diethyl carbonate, dimethyl carbonate, methyl ethyl carbonate, lithium hexafluorophosphate, phosphorus pentafluoride, and hydrofluoric acid, etc. Electrolytes are the medium used in chemical batteries, electrolytic capacitors, etc. (they have a certain degree of corrosiveness), providing ions for their normal operation and ensuring that the chemical reactions occurring during operation are reversible.
In addition, the production process of lithium batteries requires a large number of auxiliary materials, such as copper foil, aluminum foil, casing (aluminum casing, steel casing, etc.), cover plates, protective plates, and packaging. Some batteries also require aluminum-plastic film, etc.
