Development of 18650 high-capacity lithium battery

The development of 18650 high-capacity lithium batteries uses high nickel materials as the positive electrode to prepare 18650 cylindrical lithium batteries with a nominal discharge capacity of 2800mAh at 0.5c. The results show that the one-time charge-discharge efficiency of the high nickel button battery is 88.7%. Li oxidation covers the entire range of oxidation peaks (3.7~5.0v), at 4.25v, Ni 2+/Ni4+ electro-oxidation, at 5.0v, the oxidation of carbon dioxide+/Co4+ and the reaction of nickel oxide occur at the beginning, and the company occurs Oxidation and ascending potential. The discharge capacity of 0.5c, 1.0c, and 2.0c of high nickel 18650 lithium battery is 99.89%, 99.26%, 97.38%, and the discharge temperature is 0.2c, which meets the requirements of rapid battery charging and discharging. The capacity retention rates corresponding to 20, 100, 200, and 450 cycles of battery charge and discharge are 98.40%, 94.74%, 87.62%, and 82.22%, respectively. At a low power ratio (0.5c), the heat dissipation effect of the traditional 18650 battery is similar to that of the experimental battery. As the discharge ratio increases, the temperature difference between the heat dissipation effects of the two structures also increases. Keywords: 18650 lithium battery; high capacity; electrochemical performance; cycle life; rate discharge; heat dissipation structure. Lithium battery has the advantages of high voltage, small size, light weight, high specific energy density, no memory effect, and long service life. At present, lithium batteries on the market are mainly divided into square, flat, cylindrical, etc. Compared with square and 18650 cylindrical lithium batteries, they have the following advantages: higher energy density, about 30% higher in energy density; (2) battery The arrangement of the battery also has a considerable impact on safety. Once the battery is thermally controlled, it is not easy to affect the surrounding batteries due to its small capacity; (3) Low cost. Therefore, it is widely used in notebook computers, flashlights, digital cameras, portable speakers and other industries. Due to backward equipment and lack of technical background, domestic product quality cannot be guaranteed by 18650 cylindrical lithium battery companies, and the market competitiveness is poor, so products can only flow into the middle and low-end markets, and the huge demand in the middle and low-end markets misleads the whole The direction of the market. How to survive and stand out among many lithium battery companies requires the company to attach importance to the development of high-end products. The important problem faced by the high-capacity (2800mah) 18650 lithium battery is to effectively dissipate heat while increasing battery capacity. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: LED rechargeable lithium battery flashlight repair method