18500 battery

The development of new magnesium 18500 battery negative electrode materials can effectively improve the overall electrochemical performance

Rechargeable magnesium batteries using magnesium metal as negative electrodes have potential advantages such as abundant resources, high theoretical specific energy, no lithium dendrite growth, good safety, and low price. However, due to the large polarity of divalent Mg2+ and the slow kinetics of Mg2+ embedding into the positive electrode material, the actual performance of magnesium batteries is seriously restricted. So far, only a few metal/alloy or ion-embedded negative electrode materials in magnesium batteries have shown suitable discharge capacity and cycle stability.

In order to improve the comprehensive performance of magnesium 18500 battery electrode materials, it is necessary to optimize their atomic structure and surface interface. Lattice defects in electrode materials, such as oxygen vacancies, have a great influence on the physical and chemical properties of transition metal oxides. Oxygen vacancies in electrode materials can promote the transmission of electrons and ions, effectively improving the electrochemical performance of batteries.

Professor Jin Zhong and Professor Ma Jing's team from Nanjing University worked closely together and proposed a new atomic substitution method to use ultrathin TiS2 nanosheets as precursors to synthesize ultrathin, porous, black TiO2-x (B-TiO2-x) nanosheets containing abundant oxygen vacancies (OVs) for use as negative electrode materials for magnesium batteries. Both experimental results and DFT theoretical calculations confirmed that the large amount of OVs present in the B-TiO2-x electrode material can significantly improve the conductivity of the material and provide a large number of magnesium ion storage sites, and exhibit faster electrochemical reaction kinetics and excellent specific capacity and cycle stability. This work proves that the overall electrochemical performance of magnesium 18500 battery electrode materials can be effectively improved by using defect engineering strategies.

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