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At present, the main market-oriented anode materials are graphite, but there are some defects such as low gram capacity, general rate performance and cycle performance, which limit the improvement of energy density and other performance of lithium-ion batteries. Although researchers have developed negative materials such as silicon-carbon negative electrode and tin-based negative electrode, they have high expansion rate. During the charging and discharging process, they are easy to cause active substances and electrode pieces to fall off, resulting in the degradation of their cycle performance.
In this context, Shaoshan Runze New Energy Technology Co., Ltd. has carried out research and development for the industrialization of high-performance graphite (carbon) composite anode materials. The main technical features are as follows:
1. The research and development of the physical purification method of carbon composite negative electrode materials adopts the physical purification, i.e. high temperature purification process, which uses the high temperature resistance of graphite to place it in an electric furnace, insulates the air and heats it to 2200-2300 ℃, volatilizes the impurities and improves the concentrate grade. High temperature purification can obtain high-purity graphite with the product level of 99.9999%, and the final material purity is high, pollution-free and energy-saving up to 50% On the other hand, the service life is greatly improved, which solves the problems of environmental pollution, low material purity, poor energy-saving effect and short service life caused by exhaust gas emission caused by purification of existing carbon composite anode materials with additives.
2. Research and development of storage device for carbon nano purification, a storage device for carbon nano purification is developed, which includes tank body and bracket assembly. The purified carbon nano is put into the tank through the feed port, and then the carbon nano in the tank can be cooled by rotating the rotary table, and then the baffle at the discharge port is opened, and the carbon nano flows out through the discharge port. When the carbon nano in the tank flows out of the part , it will not flow out automatically. At this time, rotate the rotating shaft through the turntable, and the rotating shaft drives the scraper assembly through the connecting rod. When the scraper assembly rotates, it can drive the carbon nano at the bottom of the tank body to move to the discharge port, so that the carbon nano flows out. The scraper assembly includes two arc-shaped plates and a scraper head arranged on the arc-shaped plate. The angle between the arc-shaped plates is 30-120 °. When the rotating shaft rotates, the carbon nano moves to the connection of the arc-shaped plate, so as to facilitate the removal of the carbon nano. It solves the problems of the existing carbon nano storage equipment, such as large volume, difficult to take out materials and so on.
3. Specific objectives and parameters of the project
4. After the completion of the project, the ash content of the product is ≤ 0.0006%, pollution-free and energy-saving up to more than 50%.
5. cycle life ≥ 600 times.