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The main negative electrode materials for lithium-ion batteries include carbon, graphite, silicon, tin, cobalt, etc. The common classification methods for carbon negative electrode materials for lithium-ion batteries include natural graphite negative electrode materials, artificial graphite negative electrode materials, amorphous carbon negative electrode materials, and silicon carbon composite negative electrode materials.

The characteristics of carbon negative electrode materials for lithium-ion batteries are as follows:

1. High specific capacity: Carbon negative electrode materials have a high specific surface area and can provide more reaction surfaces, thus having a high lithium insertion/desorption capacity. The specific capacity of natural graphite is about 372mAh/g, artificial graphite can reach 350-360mAh/g, and amorphous carbon can reach 250-300mAh/g.

2. Long cycle life: Due to the reversible chemical reaction between carbon negative electrode materials and lithium, its cycle life is relatively long. At the same time, carbon negative electrode materials also have good stability and overcharging resistance, which can maintain the safety performance of the battery.

3. Low price: Carbon negative electrode materials have a relatively low cost and are easy to obtain raw materials, making them widely used commercial materials.

4. High safety: Compared with other negative electrode materials, carbon negative electrode materials have better thermal stability and safety, and are less prone to dangerous situations such as overheating and explosion.

In lithium-ion batteries, soft carbon is commonly used as the negative electrode material for high-power batteries, while hard carbon is suitable for the negative electrode material of high-energy batteries. Carbon negative electrode materials are one of the most commonly used negative electrode materials in lithium-ion batteries due to their high specific capacity, long cycle life, low price, and high safety.

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