A new anode material for magnesium battery -Lithium - Ion Battery Equipment

Develop new anode materials for magnesium batteries -Lithium - Ion Battery Equipment

Rechargeable magnesium battery with metal magnesium as negative electrode has the potential advantages of rich resources, high theoretical specific energy, lithium free dendrite growth, good safety and low price. However, due to the large polarity of divalent Mg2+and the slow dynamics of Mg2+embedded in the cathode material, the actual performance of magnesium battery is seriously restricted. So far, only a few metal/alloy or ion embedded anode materials in magnesium batteries have shown appropriate discharge capacity and cycle stability.(Lithium - Ion Battery Equipment)

In order to improve the comprehensive performance of magnesium battery electrode materials, it is necessary to optimize the atomic structure and surface interface design. 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 transport of electrons and ions, and effectively improve the electrochemical performance of batteries.

Professor Jinzhong and Professor Ma Jing of Nanjing University have worked closely together to propose a new atomic substitution method, which uses ultra-thin TiS2 nanosheets as precursors to synthesize ultra-thin, porous, black TiO2 x (B-TiO2 x) nanosheets containing oxygen rich vacancies (OVs) for magnesium battery cathode materials. The experimental results and DFT theoretical calculation both confirm that a large amount of OVs in B-TiO2 x electrode materials can significantly improve the conductivity of the materials and provide a large number of magnesium ion storage sites, and show a fast electrochemical reaction kinetics and excellent specific capacity and cycle stability. This work shows that the overall electrochemical performance of magnesium battery electrode materials can be effectively improved by using defect engineering strategy.

This achievement was published on ACSNano2018,1212492-12502 under the title of "AtomicSubstitutionEnabledSynthesisof Vacancy RichTwo DimensionalBlackTiO2-xNanoflakes for High Performance Regional Magnesium Batteries". This research work has been supported by the National Key R&D Program, the National Natural Science Foundation of China, the Jiangsu Outstanding Youth Fund, the Jiangsu Mass Entrepreneurship and Innovation Talent Program and other projects.



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