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Advanced materials: Double anions jointly "pave the way" to realize fast charging sodium ion battery

wallpapers Cruise 2020-09-27
Due to its low cost abundant resources

is an ideal choice for energy storage in the future. However the slow reaction kinetics limited theoretical specific energy limit the practical application of sodium ion battery. It is an effective way to design multi electron reaction to improve the theoretical energy density of sodium ion battery. However for multi electron reactions the simultaneous storage of multiple sodium ions will lead to the decrease of reaction kinetics. Therefore it is an important direction of innovative research to realize the synchronous improvement of sodium storage speed stability through the bidirectional design of material macro scale microstructure.

Professor Chen Renjie of Beijing University of technology has synthesized Mosse with 2H 1t complex phase structure by using ammonium tetrathiomolybdate as sulfur source molybdenum source selenium powder as selenium source. Among them the 1t phase has the metal characteristics of high electronic conductivity is conducive to the infiltration of electrolyte while the 2H phase is stable in nature has stable sodium storage structure. By combining with graphene sheet to form a three-dimensional conductive structure the rapid transmission of Na electrons in the electrode can be realized. At the same time there is a uniform gap between the Mosse nanorods which reserves space for alleviating volume expansion. Due to the introduction of se2 - ions with larger ion radius not only the interlayer spacing of the material is enlarged but also a few layer structure is formed which reduces the mutual squeezing force between layers.

proved the effective improvement of the dynamic properties of sodium storage through the systematic characterization of the electrochemical properties of the materials. In the temperature range of 0 ~ 60 ° C the current density of 0.2 ~ 6.4a g-1 it shows good cycle stability. It has good compatibility with organic ester electrolyte inorganic solid electrolyte (na3ps4) can achieve high rate long cycle performance at the same time. It is found that the significant pseudo capacitance effect rapid Na migration are beneficial to the efficient storage of multiple electrons ions.

combined with in-situ characterization theoretical simulation proved that the Mosse electrode has a complex sodium storage process its high specific capacity is due to the contribution of elemental sulfur selenium produced in the reaction process. From the X-ray absorption spectra at different potentials it can be observed that the Mo-S Mo se bonds gradually weaken indicating that stable elemental sulfur elemental selenium are gradually formed during the charge discharge process a highly reversible cycle is realized. In the double anion Mosse structure the adsorption energy migration barrier of Na are optimized which can also explain the deep reason for the improvement of kinetic performance. This research work will provide new ideas for anion regulation phase structure design provide new ideas for effectively improving the theoretical energy density of sodium ion battery based on multi electron reaction.


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