lithuim ion battery 18650

　　German KIT lithuim ion battery 18650 technology achieves breakthrough, storage capacity can be increased by 30%

　　Recently, researchers from the Karlsruhe Institute of Technology (KIT) and collaborating institutions studied structural changes during the synthesis of cathode materials for future high-energy lithium-ion batteries and obtained new discoveries about degradation mechanisms. Their findings could help develop higher-capacity batteries that could increase the range of electric vehicles.

　　Lithium-ion batteries with increased charging capacity will help solve the long-standing problem of short driving range caused by insufficient power that has so far hindered the breakthrough of electric vehicles. Professor Helmut Ehrenberg, head of the Institute of Applied Materials-Energy Storage Systems (IAM-ESS), said: "We are developing this high-energy system based on a fundamental understanding of battery electrochemical processes and through the innovative use of new materials. We believe that lithium-ion The storage capacity of the battery can be increased by 30%." The research was conducted at the Center for Electrochemical Energy Storage in Ulm & Karlsruhe, Germany's largest electrochemical energy storage research platform.

　　What differentiates high-energy lithium-ion technology from conventional technologies is the specific cathode material. Unlike the layered oxides of varying proportions of nickel, manganese and cobalt used so far, the use of manganese-rich materials containing excess lithium can greatly improve the energy storage capacity per unit volume/mass of the cathode material. However, the use of these materials has been problematic.

　　During the insertion and extraction of lithium ions, the basic function of the battery, the high-energy cathode material degrades. After a certain period of time, the layered oxide transforms into a crystalline structure with highly unfavorable electrochemical properties. As a result, the average charge and discharge voltage decreases from the beginning, which hinders the development of high-energy lithium-ion batteries.

　　The researchers have now described the basic principles of the degradation in Nature Communications: "Based on detailed studies of high-energy cathode materials, we found that degradation does not occur directly, but rather through the formation of hitherto almost undiscovered lithium-containing rock salt structures. "Occurring indirectly. In addition, oxygen plays an important role in the reaction." In addition to these results, the study also shows that new findings about the performance of battery technology do not necessarily have to be derived directly from the degradation process, the scientists involved in the synthesis of cathode materials. They were discovered in research.

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