The new internal structure of lithium batteries is theorized, and Russian scientists have put forward new insights.

The charging and discharging process of lithium-ion batteries is a very complicated reaction process. It has many different reaction states. Although lithium-ion batteries are becoming more and more popular and replaced and used by more industries, some of their working principles are still unknown. Continuous observation is one of the best ways to improve the performance of lithium-ion batteries, but considering the complexity of its structure and the limitations of the microscope, this is not an easy task. Scientists at the Skoltech Energy Technology Center in Moscow have developed a new method to closely observe the formation of solid electrolyte intermediates (SEI) in certain lithium batteries. Researchers describe SEI as the reduction product of a thin layer of electrolyte formed on the surface of the anode during several initial cycles of lithium-ion batteries. The researchers said that the formation of this film is essential to slow down the loss and aging of lithium batteries. However, in-situ measurements of the SEI formation have proven to be very difficult, and the only way to obtain results is to replace commercial battery materials with more uniform alternative materials in the laboratory. As for now. This method is very limited. And there is a high degree of difficulty in operation.'Because the battery's electrical grade material is usually in powder state, it is difficult to observe the dynamics of its surface through an atomic force microscope (AFM). This difficulty will be increased even more in a liquid environment.' Sergey Lukkin, a scientist at Scott Technology, said. Because the standard battery electrodes are too rough, it is impossible to perform such measurements, and isolated particles are often separated from the substrate during the scanning process. In order to try to solve this problem, we can only embed the particles in epoxy resin and the cross section so that they can be fixed on the detection substrate. 'In addition to highly oriented pyrolytic graphite (which is one of the more uniform carbon materials previously used in the study of SEI), the Skoltech team also applied its cross-sectional process to medium carbon microbead graphite and non-graphitizable non-graphitizable graphite. The crystal carbon electrode allows researchers to observe the thickness of the resulting SEI film and evaluate its electrical and mechanical properties. It was found that different electrode materials have a great influence on the formation conditions of SEI, and the adhesion of SEI is related to the surface roughness of the electrode. Since SEI can penetrate high-porosity surfaces and obtain good adhesion, rough surfaces can promote the reduction of degradation rate. In the cross-sectional analysis of the lithium manganese cobalt cathode, no SEI layer was found. According to the findings of the scientists, future research should recognize the fundamental difference between the anode and cathode stability mechanisms. Disclaimer: The articles published on this site are all from the Internet and do not represent the views of this site. If there is any infringement, please contact to delete WeChat: Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact delete A: The method of non-contact rapid detection of internal defects of lithium batteries was discovered. Can greatly improve the reliability of lithium batteries