TU-TESL

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(source: a * star official website) according to foreign media reports, researchers from the nanobiology Laboratory (NBL) of Singapore a * star Research Institute have developed a semi-solid electrolyte, which can improve the safety of lithium sulfur without affecting battery performance. This breakthrough has paved the way for lithium sulfur batteries to be used as efficient power solutions for a variety of electronic and energy storage applications. The main obstacle to the industrial application of lithium battery lies in its safety. Because the liquid organic electrolyte in the battery is highly flammable and easy to leak; in addition, the battery needs to rely on the electrode separator with unstable thermal and mechanical properties. Although the solid electrolyte has the potential to improve the safety performance of lithium battery, the poor contact between the electrolyte and the electrode and the low ionic conductivity make the conductivity and performance of the battery poor. Professor Jackie y. Ying, head of NBL research group, said: "the mixed quasi-solid electrolyte composed of liquid and solid is a practical compromise, which can not only keep the battery safe, but also achieve good performance. However, the high resistance of the solid element has a great influence on the performance of the battery. To overcome this problem, we reconstruct the microstructure of solid components. Our new solution can not only solve the problem of electrolyte leakage, but also have stable thermal and mechanical properties. " NBL research team designed a mixed quasi-solid electrolyte, and made li7la3zr2o12 (llzo) thin sheet into porous membrane which can absorb liquid electrolyte. The team also developed a new method to prepare llzo thin films for building electrolyte framework, and named this one-step method of making 3D framework "Cupcake method". Researchers favor llzo because of its high ionic conductivity and excellent chemical and electrochemical stability. Thanks to the non rigid structure, the electrolyte can keep good contact with the electrode, and is not easy to crack during operation and battery assembly, which is conducive to improving the safety and performance of the battery. In addition, NBL semi-solid electrolyte can be stable in a large voltage range, and is compatible with different lithium battery electrode materials, including high-voltage anode. The lithium sulfur battery, which is made of NBL new electrolyte, has high capacity, fast charge and discharge ability, and can inhibit the shuttle of polysulfide, and the battery performance is stable. During the experiment, the new electrolyte can achieve high rate performance (1 and 2c are ~ 515 MAH / g and ~ 340 MAH / g respectively) at a load density of 1.5 mg / cm2. This is one of the best performance for the lithium sulfur hybrid quasi-solid battery. Professor Ying said: "we found that this kind of 3D chip architecture is very important for improving battery performance. In addition, our system exhibits excellent stability at extreme temperatures. The results show that our chip based structure has great potential and can be used as the framework of other semi-solid lithium batteries. " The NBL team is developing new lithium-ion, lithium sulfur and lithium solid-state batteries that can be commercialized.