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Advanced functional materials: cation rich defects Fe3-xC@C Intelligent control of polysulfide adsorption / catalysis by hollow microspheres for high performance lithium sulfur battery

wallpapers News 2020-08-22

lithium sulfur battery is expected to be the next generation of energy storage system for large-scale use because of its high energy density low cost high environmental compatibility. However the commercialization of lithium sulfur batteries has been limited by some technical problems such as the low conductivity of sulfur the dissolution shuttle effect of lithium polysulfide (lips) intermediates in the electrolyte the volume expansion of sulfur during charging discharging the slow conversion kinetics of lips. These problems lead to the poor cycle stability rate performance of lithium sulfur batteries which can not meet the requirements of high energy The dem of energy storage devices especially power batteries is increasing.

recently Associate Professor Wang Xin of South China Normal University academician Chen Zhongwei of University of Waterloo in Canada have designed a unique cation vacancy rich polymer by defect engineering Fe3-xC@C Hollow microspheres are used as host materials to improve the adsorption catalytic conversion of polysulfides to achieve excellent electrochemical performance. As the fourth element in the earth's crust iron has the advantages of high yield low price. It is very ideal to use iron-based materials to construct battery electrodes. However it is difficult for iron-based materials with perfect crystal structure to show excellent polysulfide adsorption catalytic conversion ability at the same time the performance is always unsatisfactory. However through the design of defect engineering the introduction of imperfect structure can make it have more perfect performance. The experimental computational results show that this kind of Fe3 XC with imperfect structure has stronger lips adsorption capacity catalytic performance than Fe3C which can effectively inhibit the shuttle effect achieve rapid redox kinetics. At the same time the hollow porous structure of Fe3 XC hollow microspheres can not only make the active sites fully exposed but also cooperate with the surface carbon coating layer to build a fast electron ion transport channel further accelerating the electrochemical conversion process of polysulfides. Based on the advantages of these structural designs Fe3-xC@C It has excellent rate cycle performance. The designed lithium sulfur battery can be charged in 15 minutes the capacity retention rate is still above 60% after 1000 cycles. It is expected to become the energy source of the next generation of fast charging electric vehicles. In this work the sulfur carrier material rich in Fe vacancies was introduced for the first time which opened up a new vacancy engineering design idea provided a new insight for the realization of high performance lithium sulfur battery. It is believed that this will open a new way for the design of "spkds" in the field of high sulfur energy storage.

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