Shenzhen Institute of Advanced Technology has made progress in research on 16340 battery

　　On October 14, the electrochemistry team of the Photonic Information and Energy Materials Research Center of the Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences made important progress in the direction of high-safety secondary lithium batteries. The relevant results were published in the top international energy journal Energy Storage Materials under the title Reinforcing Concentrated Phosphate Electrolytes with In-Situ Polymerized Skeletons for Robust Quasi-Solid Lithium Metal Batteries (high-concentration phosphate semi-solid electrolytes supported by in-situ polymerized polymer skeletons). 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 popularity of electric vehicles, the safety issues of high-energy-density lithium batteries have become increasingly serious. In particular, the increasing frequency of electric vehicle fires reported both internationally and domestically in recent years has highlighted the challenge of designing batteries that take into account both safety and energy density. In order to solve this problem, the research team developed a high-performance flame-retardant quasi-solid electrolyte suitable for lithium metal anodes. The electrolyte uses in-situ polymerization of the polymer skeleton to support the non-flammable phosphate ester solvent, which combines high safety and high iodine chemical stability. Quasi-solid-state batteries based on this electrolyte can operate stably under bending, impact, shear, air exposure, and direct open flame burning, and have demonstrated excellent performance without attenuation for 600 cycles.

　　In addition, this study systematically discussed the stability of the interface between gel electrolyte and lithium metal using the perturbation stability theory based on the Euler method, and deeply revealed the polymer skeleton content, lithium ion conductivity, and shear modulus in the gel electrolyte. and the ability to resist lithium dendrites, which has important guiding significance for the design of polymer electrolytes.

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