Research on the development of key materials for lifepo4 18650 battery

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　　lifepo4 18650 battery and material performance requirements

　　Solid-state lithium battery is a type of lithium battery that uses solid electrode materials and solid electrolyte materials.

　　Unlike liquid lithium batteries and hybrid solid-liquid lithium batteries, the battery cells of solid lithium batteries do not contain any liquid electrolytes, liquid solvents and liquid additives.

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　　lifepo4 18650 battery show great advantages in safety, cycleability, high temperature resistance, energy density, etc., and have different performance requirements for materials.

　　Lithium ion migration number

　　If the migration number is too low, anions will accumulate on the electrode surface, resulting in increased battery polarization and increased battery internal resistance.

　　Solid-solid interface compatibility

　　Relevant materials must have good physical compatibility and chemical compatibility to ensure sufficient contact between the solid electrolyte and the solid electrode. During the service process, the interface contact is stable and difficult to separate. At the same time, no electrochemical side reactions occur between the electrolyte and the electrode.

　　02

　　Key materials for lifepo4 18650 battery

　　According to the composition of battery materials, lifepo4 18650 battery can be divided into solid electrolytes, positive active materials, negative active materials, conductive agents and current collectors.

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　　Solid electrolyte is the core component of solid lithium battery. Currently, there are three main categories: polymer solid electrolyte, oxide solid electrolyte, and sulfide solid electrolyte.

　　polymer solid electrolyte

　　The polymer solid electrolyte is composed of a polymer matrix and a lithium salt complex.

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　　Oxide solid electrolyte

　　Oxide solid-state electrolytes have the advantages of high ionic conductivity, excellent high temperature resistance, wide electrochemical window, and lithium ion migration number close to 1, and are currently a research and development hotspot.

　　Oxide solid electrolytes can be divided into thin film type and non-thin film type according to application scenarios.

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　　Sulfide solid electrolyte

　　Sulfide solid electrolyte is the electrolyte with the highest ionic conductivity among current solid electrolyte systems, but it is the most difficult to develop.

　　Sulfide solid electrolytes can be divided into binary sulfides and ternary sulfides according to their constituent components.

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　　Negative active material

　　lifepo4 18650 battery can use almost all negative electrode materials of liquid lithium batteries, including carbon family materials, oxide materials, etc.

　　Silicon-based and tin-based theoretical specific capacities are as high as 4200 mA·h/g and 994 mA·h/g, and are expected to become a new generation of negative electrode materials.

　　Relying on the inherent advantages of solid electrolytes, metallic lithium and lithium alloys are also one of the main anode materials for lifepo4 18650 battery, with a theoretical specific capacity of 3860 mA·h/g.

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　　03

　　Development status of lifepo4 18650 battery in my country

　　CCID Think Tank sorted out the development status of lifepo4 18650 battery in my country from three aspects: battery system, market prospects, and school-enterprise cooperation.

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　　04

　　The main problems faced by my country's solid-state lithium battery materials industry

　　CCID Think Tank analyzed the main issues facing the development of my country's solid-state lithium battery materials industry from three aspects: R&D strength, key technologies, and industry standards.

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　　05

　　Countermeasures and suggestions to promote the development of solid-state lithium battery materials in my country

　　CCID Think Tank proposed countermeasures and suggestions to promote the development of solid-state lithium battery materials in my country from three aspects: industrial innovation system, industrialization path, and international influence.

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