What are the new progress in the research of negative electrode materials for AAA rechargeable battery at Fujian Institute of Structure of Matter?

Sodium has similar physical and chemical properties to lithium, and sodium resources are abundant and cheap, so sodium-ion battery technology has received widespread attention. The development of high-performance and stable sodium storage materials is the key to the practical application of AAA rechargeable battery. Due to its high specific capacity and graphene-like 2D sheet structure, molybdenum disulfide (MoS2) has great application potential in sodium ion storage. However, in the actual battery charging and discharging process, the molybdenum disulfide sheets will aggregate with each other, which will lead to changes in the volume of the electrode material and the destruction of the microstructure, and ultimately make the battery show poor rate performance and cycle stability.

The inorganic synthetic chemistry team led by Zhang Jian, a researcher at the State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, in collaboration with Dr. Zhang Huabin, funded by the National Key R&D Program, the National Natural Science Foundation, and the Strategic Priority Research Program of the Chinese Academy of Sciences, used a secondary sulfurization (solvothermal sulfurization and high-temperature calcination sulfurization) and acid etching strategy to transform the zinc-molybdenum-based zeolite-type imidazole framework (HZIF-Zn/Mo) into a hollow microcube framework (HMF-MoS2) assembled by ultrathin molybdenum disulfide nanosheets rich in molybdenum defects.

As a negative electrode material for AAA rechargeable battery, this material exhibits high reversible capacity, excellent rate performance and cycle stability. Kinetic analysis results show that the ultrafast sodium ion storage of HMF-MoS2 originates from its own capacitive charge storage. Experimental results and theoretical calculations show that a large number of molybdenum defects can effectively improve the conductivity of molybdenum disulfide and enhance the interaction between molybdenum disulfide and sodium ions, thereby improving the sodium storage properties of HMF-MoS2. Through defect and morphology control, this work helps to understand the electrochemical reactions on the surface of molybdenum disulfide from a molecular level, and provides new ideas for studying the application of other transition metal sulfides in the energy field.

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