On October 14, the electrochemical team of the Photonic Information and Energy Materials Research Center, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences made progress in the direction of high-security secondary lithium batteries. Related achievements were published in the International Energy Journal Energy Storage Materials with the title of Reinforcing Concentrated Phosphate Electrolytes with In-Situ Polymerized Skeletons for Robust Quasi-Solid Lithium Metal Batteries. on. The first author of the article is master student Chen Jiahua, and the corresponding authors are assistant researcher Lu Ziheng and researcher Yang Chunlei.
With the popularization of electric vehicles, the safety problem of high energy density lithium batteries is becoming more and more serious. Especially in recent years, international and domestic fire incidents of electric vehicles have become increasingly frequent, which highlights the challenge of designing batteries that balance safety and energy density. To solve this problem, the research team developed a high-performance flame retardant quasi-solid electrolyte suitable for lithium metal anodes. The electrolyte polymerizes the polymer skeleton in situ to support the non-flammable phosphate ester solvent, and has both high safety and high iodine chemical stability. The quasi-solid battery based on this electrolyte can run stably under bending, impact, shearing, air exposure, and direct flame burning, and exhibits excellent performance of 600 cycles without attenuation.
In addition, the study uses the perturbation stability theory system based on Euler method to discuss the stability of the interface between the gel electrolyte and lithium metal, and further reveals the content of the polymer skeleton, lithium ion conductivity, and shear modulus And the relationship between the ability to resist lithium dendrites has important guiding significance for the design of polymer electrolytes.
Schematic diagram of the new quasi-solid electrolyte
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