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    Home > The research group of Professor Zhou Xiaosi of Nanjing Normal University has made important progress in the field of potassium ion battery

    The research group of Professor Zhou Xiaosi of Nanjing Normal University has made important progress in the field of potassium ion battery

    • Last Update: 2019-10-25
    • Source: Internet
    • Author: User
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    Recently, the research group of Professor Zhou Xiaosi of Nanjing Normal University has made important progress in the field of potassium ion batteries Relevant achievements were published in angel Chem Int ed (DOI: 10.1002 / anie 201908918) under the title of "enabling superior electrical properties for highly efficient potassium storage by impressing ultrafine sb nanocrystals within nanochannel containing carbon nanofibers" Potassium ion batteries (PIBs) have attracted much attention due to their high energy density, abundant Potassium Resources and low cost One of the key to large-scale application of potassium ion battery is to find electrode materials with high reversible capacity, excellent rate performance and long cycle stability Antimony (sb) is considered as one of the most potential anode materials for PIBs due to its high theoretical specific capacity, special fold structure and good working voltage However, the huge volume change greatly limits the practical application of antimony Although the sb alloying reaction can provide a theoretical capacity of 660 MAH g-1, the alloying is usually accompanied by a volume expansion of more than 400% and the pulverization of sb particles during the cycle The pulverization of antimony particles will lead to the loss of electrical contact of active materials and the continuous formation of solid electrolyte membrane (SEI) In addition, the aggregation of sb nanoparticles in the circulation process will lead to the decrease of dynamic attenuation and circulation stability Reducing the particle size of sb and combining it with carbon network is an effective strategy to buffer the volume change and enhance the ion and electron transport, but these methods are still insufficient to improve the cycle life and rate performance of the battery This is mainly due to the fact that the nanostructured sb inevitably tends to rupture, aggregate and separate from the carbon skeleton, reducing the electron transport path during charging and discharging In addition, it has been proved that the use of layered porous structure can significantly accelerate the electron and ion transport of active materials, thus improving the cycle stability and rate performance of secondary batteries Recently, Professor Zhou Xiaosi's research group of Nanjing Normal University has used a simple and feasible method, that is, electrostatic spinning and subsequent heat treatment, to disperse ultrafine sb nanocrystals in situ in carbon nanofibers containing nano channel arrays (u-sb @ CNFs) In this work, the antimony / carbon complex with the smallest antimony size has been prepared by adjusting the solubility parameters of polymers and the reaction conditions Due to the small size of antimony particles and carbon nanofibers with nano channel array, u-sb @ CNFs can realize rapid potassium ion diffusion and stress release, and solve the problems of unstable antimony / electrolyte interface and huge volume change As a kind of negative electrode of self-supporting potassium ion battery, u-sb @ CNFs has high reversible capacity, long cycle stability and excellent rate performance Ge Xufang, a graduate student of Nanjing Normal University, is the first author of the article, and Professor Zhou Xiaosi is the corresponding author.
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