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Anode material preparation
The preparation of anode material is an important step in the manufacture of lithium battery, which directly affects the efficiency of charge and discharge, cycle life and safety of the battery. The commonly used anode materials are mainly graphite and silicon-based materials.
Anode material preparation
The preparation process of anode material involves many links such as raw material selection, material treatment, slurry preparation, coating and heat treatment. Graphite anode materials are widely used for their stability and good electrochemical properties, while silicon-based materials are regarded as key materials for improving battery performance due to their high energy density. Whether it is graphite or silicon-based materials, good electrical conductivity, stability and suitable structural design are the keys to ensure battery performance.
Main process
Raw material selection
The choice of anode materials mainly includes graphite and silicon-based materials, graphite is widely used because of its stability and recycling properties, and silicon-based materials have higher theoretical capacity, which is an ideal material for improving energy density. Choosing the appropriate anode material is the basis of determining the performance of the battery. The choice of anode material directly affects the energy density, stability and cycle life of the battery.
Preparation of graphite anode materials
The preparation process of the graphite anode material includes the treatment of the graphite powder, the mixing of the conductive agent and the adhesive, and the steps of coating on the copper foil, and finally forming the electrode material with high conductivity and good stability. The coated material is dried to ensure its stability.
Graphite anode material has good cycle performance and stability, suitable for most application scenarios.
Preparation of silicon-based anode materials
Silicon-based materials have a high theoretical capacity, but they experience volume expansion during charge and discharge, so silicon-carbon composites are usually used to improve their stability. The cycle life of silicon materials can be improved by ball milling and chemical vapor deposition.
Silicon-based anode materials have higher capacity, and silicon-carbon composites can solve the problem of volume expansion and improve the stability and performance of materials.
Heat treatment of negative electrode materials
After the preparation of the anode material, it is necessary to further improve its structure through heat treatment to enhance its electrical conductivity and stability. Controlling heat treatment temperature and time is the key to ensure the properties of anode materials.
Heat treatment can improve the electrochemical properties of anode materials, but it requires precise control of temperature and time to ensure the stability and efficiency of the material.
Electrochemical performance test and screening
Negative electrode materials need to undergo a number of electrochemical tests such as capacity test, cycle life test, rate performance test to ensure its stability and efficiency in practical applications. Screening out qualified materials is the last step to ensure battery performance.
Electrochemical performance testing is an important link to ensure that the anode material meets the high performance standards, which can effectively screen out high-quality materials and ensure the use of batteries.
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