February 22, 2025

New progress has been made in the research of anode materials for sodium ion batteries in Fujian Institute of Industrial Technology

Sodium has similar physical and chemical properties as lithium, and is rich in sodium resources and low in price. Therefore, 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 sodium ion batteries. Due to the high specific capacity and the graphene-like 2-dimensional lamellar structure, molybdenum disulfide (MoS2) has great potential for 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 the volume change of the electrode material and the destruction of the microstructure, which ultimately makes 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 at the Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, collaborated with Ph.D. Secondary vulcanization (solvent thermal vulcanization and high-temperature calcination vulcanization) and acid etching strategy to transform zinc and molybdenum-based zeolite imidazole framework (HZIF-Zn / Mo) into ultra-thin molybdenum disulfide nanosheets rich in molybdenum defects Hollow micro-cube frame (HMF-MoS2). As a negative electrode material for sodium ion batteries, the material shows a high reversible capacity, excellent rate performance and cycle stability. The kinetic analysis results indicate 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, enhance the interaction between molybdenum disulfide and sodium ions, and thus improve the sodium storage properties of HMF-MoS2. Through the control of defects and morphology, this work helps to understand the electrochemical reaction on the surface of molybdenum disulfide at the molecular level, and provides new ideas for studying the application of other transition metal sulfides in the field of energy. The above work was published in ACS Nano, 2019, DOI: 10.1021 / acsnano.9b00383. The first author of the article is Li Yang, a PhD student.

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