18650 battery 3500mah

　　Research direction of 18650 battery 3500mah anode materials, lithium ion battery graphite anode material technology

　　Research direction of 18650 battery 3500mah anode materials, lithium ion battery graphite anode material technology. Among the four major materials for lithium batteries, the technology of negative electrode materials is relatively mature. Through investigation and analysis of the current commercial lithium-ion battery carbon anode material industry and the research status of other non-carbon anode materials, we believe that for a long time to come, carbon anode materials represented by graphite will still firmly occupy the lithium-ion Battery anode materials market.

　　Research direction of 18650 battery 3500mah anode materials

　　Anode materials have many performance indicators such as gram capacity, rate performance, cycle life, first efficiency, compacted density, expansion, specific surface area, etc., and it is difficult to take into account them all. For example, large particles have good compacted density and high gram capacity, but poor rate performance. Good; the opposite is true for small particles. Anode manufacturers need to improve the overall and comprehensive performance of materials by optimizing the production process.

　　As one of the key materials for lithium batteries, negative electrode material accounts for 10% of the battery core cost. The continued rapid growth of the new energy vehicle and power 18650 battery 3500mah markets has driven the output of 18650 battery 3500mah anode materials to continue to rise.

　　According to relevant data, the global demand for anode materials reached 170,000 tons in 2018, of which the demand for power batteries exceeded the demand for consumer batteries, reaching 75,000 tons, accounting for 44%. It is expected that the global market demand for anode materials will exceed 300,000 tons by 2020, of which the demand for anode materials for power batteries will exceed 183,000 tons, accounting for 61%.

　　The research and development of emerging anode materials has become an important direction to improve the energy density of lithium batteries. Recently, technology has been developed to use silicone as a 18650 battery 3500mah material. The power storage capacity is 10 times that of carbon materials. Many companies in my country are conducting research on using lithium titanate as anode material for lithium batteries, which has also improved the cycle life of lithium batteries accordingly. and high and low temperature performance.

　　The breakthrough point of battery capacity often lies in the material. As the performance requirements of lithium-ion power batteries continue to increase, negative electrode materials with high capacity, high safety, good stability, and low price have become a hot topic in research and discussion. From the perspective of negative electrode materials, the current carbon negative electrode material has reached 360mAh/g, and there is little room for improvement. In this context, large-capacity emerging anode materials have emerged.

　　Lithium-ion battery graphite anode material technology

　　Natural graphite, one of the graphite materials, has the advantages of high specific capacity and low price, and is widely used in the field of commercial anode materials. However, it has poor compatibility with the electrolyte, large first irreversible capacity, poor charge and discharge rate performance, and poor cycle performance. Shortcomings such as poor performance directly affect its application in long cycle life, high-rate performance lithium-ion batteries.

　　The specific surface of the graphite anode has a crucial impact on its Coulombic efficiency and long-term cycle stability. Materials with a smaller specific surface can reduce the decomposition of the electrolyte, thus improving the first Coulombic efficiency and long-term cycle stability of the battery. Therefore For lithium-ion batteries with higher requirements on life characteristics, graphite materials with smaller specific surface areas should be selected.

　　Process steps

　　1. Heat and knead the mixture of graphite and adhesive

　　2. Hot isostatic pressing

　　3. Carbonization treatment

　　4. Graphitization treatment

　　5. Crushing and grading

　　The temperature of the hot isostatic pressing is 500~1000°C and the pressure is 50~100MPa.

　　As the application scenarios and markets of lithium-ion batteries continue to expand, anode materials will develop towards high capacity density, low cost, and long cycle in the future. Now the global lithium-ion battery manufacturing industry is shifting and tilting towards China. The proportion of my country's corresponding 18650 battery 3500mah anode material production capacity will be further increased, and the varieties will be more abundant and diversified.

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