Semi-solid electrolyte can improve the safety of lithium-sulfur batteries

Gable Institute of Technology uses semi-solid electrolyte to improve the safety of lithium-sulfur batteries. Recently, researchers at the Nano Laboratory (NBL) of the Singapore Institute of Science and Technology plan to develop a semi-solid electrolyte for lithium-sulfur batteries. Improve battery safety under the premise of affecting battery performance. Lithium-sulfur batteries will be closer to becoming a high-efficiency power source for various electronic and energy storage applications. For a long time, safety issues have hindered the industrial application of lithium batteries. Lithium batteries leak highly flammable organic electrolyte liquids, relying on thermal and mechanically unstable electrode separators. Although solid electrolytes have now shown the potential to improve the safety of lithium batteries, their electrodes/electrolytes are often improperly handled and their ion conductivity is limited, resulting in poor performance of solid lithium batteries. JackieY, head of the NBL research team. Professor Ying said: The mixture of liquid and solid quasi-solid electrolytes has now become a useful compromise method to achieve safer batteries while maintaining excellent functions. However, the high resistance of solid elements has so far limited the function of such batteries. In order to solve this problem, we reprogrammed the microstructure of the solid component. Our solution eliminates the leakage of electrolyte, and the temperature and mechanical stability are very good. The NBL research team planned a hybrid quasi-solid electrolyte consisting of a liquid-infused porous membrane made of Li7La3Zr2O12 (LLZO) flakes. The team also developed a new method of manufacturing LLZO wafers, which are used to build the electrolyte framework. They call this method the cupcake method of making 3D movie structures. LLZO was selected for its high ionic conductivity and excellent chemical and electrochemical stability. The non-rigid structure of the electrolyte keeps it in good contact with the electrode and prevents it from cracking during operation and battery packaging. This makes the battery safer and more practical. NBL's semi-solid electrolyte is stable in a wide voltage range and can be used for different lithium battery electrode materials, including high-voltage cathodes. The lithium-sulfur battery prepared with the new NBL electrolyte has the advantages of large capacity and fast charge and discharge speed. In the experiment, under the load density of 1.5mg/cm2, the new electrolyte obtained obvious rate capacity (1℃~515 and 2C℃~340mAh/g, respectively). This is one of the highest functions that a lithium-sulfur hybrid quasi-solid battery can achieve. Professor Ying said: The 3D structure we discovered is essential for the best performance of the battery. In addition, our system exhibits good stability at polar temperatures. These results illustrate the great potential of our chip structure as a framework for other semi-solid lithium batteries. Currently, the NBL team is developing new lithium-ion, lithium-sulfur and lithium solid-state batteries for commercialization. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete it.