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① Material selection

Generally speaking, improving the rate performance of power lithium-ion batteries is important from the selection of materials. At room temperature of 20 ℃, the electronic conductivity of LCO material is only 5x10-8S/cm, while the electronic conductivity of NCM111 material can reach 2.2x10-6S/cm. With the further increase of nickel content, the electronic conductivity of ternary materials also significantly increases, and the electronic conductivity of NCM8111 material reaches 4.1x10-3S/cm, The ion conductivity also shows the same trend. At 20 ℃, the ion conductivity of LCO material is only 2.3x10-7S/cm, while the ion conductivity of NCM111 material is 3.2x10-6S/cm, NCM532 is 1.7x10-3S/cm, NCM622 is 3.4x10-3S/cm, and NCM811 material is 6.3x10-3S/cm.

Therefore, whether in terms of electronic conductivity or ion conductivity, ternary materials, especially high nickel ternary materials or NCA materials, are more suitable for high rate lithium-ion batteries. Of course, in addition to these intrinsic characteristics of the material, its rate performance is also influenced by multiple factors such as morphology. For example, the surface area of small particles is larger, and the diffusion distance of Li+inside the particles is shorter, so theoretically, it will have better rate performance.

There are many types of negative electrode materials to choose from, such as small particle mesophase graphite materials, which have good rate performance. Lithium titanate ion battery materials often produce nanoscale particles due to their low conductivity, which further increases the active area and reduces the diffusion distance of Li+. Therefore, lithium titanate ion batteries have excellent rate performance and can achieve fast charging.

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