602535 battery.Which battery technologies are likely to change the game?

　　Which battery technologies are likely to change the game?

　　Scientists from the Massachusetts Institute of Technology (MIT), working with South Korean tech giant Samsung, have discovered a solid-state battery that is better than today's lithium-ion batteries. In comparison, these batteries are safer and can provide more power, making them ideal energy sources for electric vehicles. However, solid-state battery technology companies also said that compared with traditional power batteries, solid-state batteries do not actually have obvious lifespan advantages. This is also the direction that current technology needs to continue to overcome, because if the lifespan and attenuation capacity cannot be improved, only relying on energy density Advantages: The current cost of solid-state batteries still cannot support their large-scale promotion and mass production.

　　02

　　Aluminum air battery

　　Low temperature lithium iron phosphate battery 3.2V 20A -20℃ charging, -40℃ 3C discharge capacity ≥70%

　　Aluminum-air batteries are said to be comparable to gasoline and cheaper and lighter than lithium batteries. In addition, the aluminum-air battery can only lose 0.02% of its power in a month, because there is a thin film on the anode and cathode of the aluminum-air battery. The battery will be filled with electrolyte during use. In the standby state, the side close to the aluminum can It is cleaned by oil, thereby protecting the aluminum. When the battery is used again, the electrolyte will immediately replace the oil, and the battery can work continuously for a long time.

　　Senior engineer Xue Yejian said that aluminum-air batteries using graphene-based composite oxides as catalysts have a large market space. The core material of aluminum-air batteries is a cathode catalyst doped with graphene. This product uses an aluminum plate as the anode, and inserts an air cathode with a graphene-based composite catalyst in a container filled with electrolyte. The aluminum reacts with the air to generate electricity.

　　03

　　New flexible battery

　　Researcher Tang Yongbing and his research team from the Functional Thin Film Materials Research Center of the Institute of Integration, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, successfully developed a flexible ultra-fast charge and discharge battery with an integrated structural design. This new structural design significantly improves the fast charging of the battery. discharge characteristics while maintaining high energy density and cycle performance.

　　Low temperature and high energy density 18650 3350mAh-40℃ 0.5C discharge capacity ≥60%

　　This new battery structural design simplifies the manufacturing process of traditional lithium-ion batteries and greatly improves the battery's fast charge and discharge capabilities. The new battery has an ultra-high rate performance of 120C (charge and discharge time is about 30 seconds). While achieving an ultra-high power density of 22634W/kg, it can still maintain a high energy density of 232Wh/kg. Ternary materials are commonly known as lithium nickel cobalt manganese oxide (LiNixCoyMn1-x-y02), which has a very similar structure to lithium cobalt oxide. This material can be balanced and regulated in terms of specific energy, cycleability, safety and cost. Different configurations of the three elements nickel, cobalt and manganese will bring different properties to the material: increasing the nickel content will increase the capacity of the material, but will worsen the cycle performance; the presence of cobalt can make the material structure more stable, but too high a content will Reduce capacity; the presence of manganese can reduce costs and improve safety performance, but too high a content will destroy the layered structure of the material. Therefore, finding the proportional relationship between the three materials to optimize comprehensive performance is the focus of ternary material research and development. . Common ratios include NCM111, 523, 622, 811, etc. NCA (LiNio.8C0015Ah0502) replaces the manganese element with aluminum element, which improves the structural stability of the material to a certain extent. However, its aluminum content is small and can be regarded as a binary material.

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