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A sodium disulfide / carbon nanocomposite based on sodium disulfide / carbon nanocomposite has been developed by Shenzhen advanced hospital

Recently, Tang Yongbing, a researcher with the functional membrane material research center of the Shenzhen advanced technology research institute of Chinese Academy of Sciences, and his research team successfully developed a sodium based double ion battery based on molybdenum disulfide / carbon nanocomposite negative electrode material. The related research results are published on the Small on the Penne-Like MoS2/Carbon Nanocomposite as Anode for Sodium-Ion-Based Dual-Ion Battery.

Lithium-ion batteries have been widely used in the fields of portable electronic equipment, electric vehicles, energy storage equipment and so on. However, due to the large-scale application of lithium-ion battery and the shortage and uneven distribution of lithium resources, the cost of lithium-ion battery is increasing. It is difficult to meet the requirements of future energy storage such as low cost, long cycle life, safety and reliability. Sodium and lithium have similar physical and chemical properties, and have abundant reserves and low cost. So the research of sodium ion based two cell system has attracted wide attention in recent years. However, the large radius of sodium ion leads to the slow diffusion of Na+ in the electrode material, which affects the performance and cycle performance of the battery.

In order to improve the rate performance and cycle performance of sodium ion battery, Tang Yongbing research team member Zhu Haili and Zhang FAN have successfully developed a sodium based double ion battery based on molybdenum disulfide / carbon nanocomposite anode material. The battery used expanded graphite as a cathode material and a MoS2/C nanocomposite with a graded structure as a negative material. As a result of this is a hierarchical structure with MoS2/C crystal layer spacing wider, is conducive to the improvement of Na+ diffusion rate in which ions, and the carbon layer improves the conductivity of the material, so that the sodium type MoS2/C nano composite double ion battery based on rate capability and good cycle performance. The results show that the capacity of the battery is 85% after 200 cycles of the current density of 2C in the voltage range of 1.0-4.0V. This new type of sodium ion battery has potential application prospects in low cost, environmental protection and large-scale energy storage, such as clean energy and smart grid.

The research has been supported by the National Natural Science Foundation, the Guangdong science and technology project and the Shenzhen science and technology project.

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