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Germany's KIT develops high-energy cathode materials to increase LR03 batterycapacity 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 LR03 batteryelectrochemical processes and through the innovative use of new materials. We believe that lithium-ion The storage capacity of the LR03 batterycan 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 increase 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, which are the basic functions of the battery, the high-energy cathode material degrades. After a certain 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 the degradation does not occur directly, but indirectly through the formation of hitherto almost undiscovered lithium-containing rock salt structures. occurring. Additionally, oxygen plays an important role in the reaction. In addition to these results, the study also shows that new discoveries about the performance of LR03 batterytechnology do not necessarily have to be derived directly from the degradation process, and the scientists involved discovered them in the study of synthetic cathode materials.
The discovery by Karlsruhe Institute of Technology marks an important milestone in the development of high-energy lithium-ion batteries for electric vehicles.
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