96kwh energy storage lithium solar battery.Recent progress in research to improve lithium battery safety

　　Recently, the team of Wen Zhaoyin, a researcher at the Shanghai Institute of Ceramics of the Chinese Academy of Sciences, achieved in-situ preparation of a gel polymer electrolyte using an ion-conducting initiator. The gel polymer electrolyte has excellent fire resistance, and solid-state lithium is assembled based on this electrolyte. The battery can still power the light-emitting diode array under both shear and fire conditions (flame temperature 528°C), greatly improving the safety of lithium batteries. Relevant work has applied for a Chinese invention patent. The main research results were published in the international journal "Advanced Energy Materials" (Advanced Energy Materials) under the title InSituGeneratedFireproofGelPolymerElectrolytewithLi6.4Ga0.2La3Zr2O12AsInitiatorandIon-ConductiveFiller. The first author of the paper is Xu Dong, a doctoral student at the Shanghai Institute of Ceramics. , the instructor is Wen Zhaoyin. Gel polymer electrolyte (GPE) combines the advantages of high safety of solid polymer electrolyte (SPE) and high ionic conductivity of liquid electrolyte to a certain extent, and is considered to be the most suitable electrolyte system for practical applications. Currently, gel polymer electrolyte systems based on polyvinylidene fluoride (PVDF) and its derivatives are currently being studied more. However, gel electrolytes still contain a certain amount of flammable liquid electrolytes, which poses safety risks. In order to further improve its safety performance and electrochemical performance, scientific researchers have done a lot of research work, mainly including organic-organic blend modification, organic-inorganic composite modification, physical/chemical cross-linking modification, etc. However, most literatures do not provide detailed reports on the safety performance of gel polymer electrolytes. On the other hand, in the preparation process of gel polymer electrolytes such as the currently commonly used phase conversion method, a large amount of volatile organic solvents are used, which not only pollutes the environment, increases costs, and the preparation process is cumbersome. The above problems can be avoided or alleviated by in-situ cross-linking polymerization preparation method. Wen Zhaoyin's team used garnet-type solid electrolyte (Li6.4Ga0.2La3Zr2O12) as the initiator and ion conductive filler, and used triethyl phosphate/fluoroethylene carbonate in polyvinylidene fluoride-hexafluoropropylene copolymer (PVDF-HFP). The defluorination and cross-linking process of PVDF-HFP was initiated in the ester (TEP/FEC) mixed solution, thereby realizing the in-situ preparation of gel polymer electrolyte, and the mechanism of the gel transition process was deeply studied. The optimized gel polymer electrolyte has an ionic conductivity of 1.83×10-3Scm-1 at 20°C and an electrochemical stability window of 4.75V at room temperature. The gel polymer electrolyte has excellent fire resistance, and the solid-state lithium battery assembled from it has high safety. The ternary lithium battery based on this gel polymer electrolyte shows good cycle stability. This work provides new research ideas for using fireproof gel electrolytes to obtain excellent ionic conductivity and ensure high safety of gel polymer electrolytes and corresponding lithium batteries. Relevant work was funded by the National Key Research and Development Program and the National Natural Science Foundation of China.

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