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    Home > Professor Li Weishan's team of South China Normal University has made important progress in the research field of high safety and high energy lithium ion batteries

    Professor Li Weishan's team of South China Normal University has made important progress in the research field of high safety and high energy lithium ion batteries

    • Last Update: 2019-12-04
    • Source: Internet
    • Author: User
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    Lithium ion batteries have been widely used in many fields, such as mobile phones, laptops and new energy vehicles, because of their high energy density and long cycle life However, lithium-ion batteries will burn or even explode under abusive or extreme conditions (such as high temperature, overcharge) This safety problem has become a major obstacle to the development of lithium-ion batteries in the direction of large-scale and high-energy It is imperative to solve the safety problem of lithium-ion battery "National and local joint Engineering Research Center for electrolyte and membrane materials and preparation technology of high energy and high safety power lithium-ion battery" has long paid attention to the safety research of lithium-ion battery, forming a series of research results in improving the safety performance of lithium-ion battery Recently, Professor Li Weishan, head of the center, published a research paper "improving electrical stability and low temperature performance with water / acetonitrile hybrid Electronics" in advanced energy materials, proposing to use non combustible water acetonitrile mixed solvent instead of traditional flammable carbonate organic solvent, To solve the safety problem of lithium-ion batteries (DOI: 10.1002/aenm.201902654) The biggest problems of using water as electrolyte of lithium-ion battery are: 1) the electrochemical stability window of electrolyte is low, and the energy density of battery is very low; 2) the water-based electrolyte freezes at low temperature, which limits the range of operating temperature of battery In this work, a new system of high energy density lithium-ion battery with high safety and wide working temperature range is proposed, which is based on the improvement of lithium salt concentration and the introduction of acetonitrile co solvent to ensure the advantages of non combustible battery, and significantly broaden the electrochemical stability window and low temperature performance of electrolyte South China Normal University is the first unit of this paper Chen Jiawei, a master's degree student in the school of chemistry, is the first author of this paper Xing Lidan, a deputy researcher, and Xu Kang, a researcher in the US Army laboratory, are co correspondents The research was supported by general program of National Natural Science Foundation of China and Guangdong provincial fund for Distinguished Young Scholars.
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