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What are the requirements of lithium ion batteries for negative electrode materials

by:Vglory      2021-05-14
As the core component of lithium-ion batteries, the anode material usually meets the following conditions in application: ①The potential of lithium ion insertion is low and stable to ensure a higher output voltage; ②It allows more lithium to be reversibly deintercalated and has a higher specific capacity. ③The structure is relatively stable during charging and discharging, and has a long cycle life; ④High electronic conductivity, ion conductivity and low charge transfer resistance to ensure small voltage polarization and good rate performance; ⑤It can form a stable solid electrolyte membrane with the electrolyte to ensure high Coulomb efficiency; ⑥The preparation process is simple, easy to industrialize, and cheap; ⑦Environmentally friendly, it will not cause serious damage to the environment in the process of material processing and actual use Pollution; ⑧ rich resources, etc. For more than 30 years, although new anode materials for lithium-ion batteries have been continuously reported, few have truly obtained commercial applications. The important reason is that there are few materials that can take the above conditions into account. For example, although metal oxides, sulfides, nitrides and other materials whose mechanism is conversion reaction have high specific capacity, they have high platform potential, serious polarization, large volume change, and difficult to form stable during the process of lithium ion insertion. The high SEI and high cost make it impossible to obtain practical applications. Graphite is widely used because it satisfies the above conditions. In addition, although Li4Ti5O12 has low capacity and high lithium ion potential, it has a stable structure during charging and discharging and allows high-rate charging and discharging, so it also has certain applications in power lithium batteries and large-scale energy storage. The processing of negative electrode materials is only one part of the entire battery manufacturing process, and the formulation of standards helps battery companies make judgments on the quality of the materials. In addition, materials will inevitably be affected by factors such as people, machines, materials, environment and testing conditions during processing and transportation. Only when their physical and chemical properties are standardized can their reliability be truly ensured. Generally speaking, the key technical indicators of anode materials include: crystal structure, particle size distribution, tap density, specific surface area, pH, water content, main element content, impurity element content, first discharge specific capacity, and first charge and discharge efficiency. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete.
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