Lithium-ion batteries have been used in all aspects of people's lives, but scientists have always believed that sodium-ion batteries are safer and less expensive than lithium-ion batteries in large-scale energy storage. However, they are short-lived and can not be used for a short period of time. Recently, the United States and China scientists jointly developed a new structure of antimony sulfide-based anode material, the antimony-based sodium ion battery from the previous no more than 500 cycles to 900 cycles, life almost comparable to lithium batteries, and the specific capacity Lithium-ion battery anode material (graphite) capacity of 1.5 times. Relevant results published in the field of nano-top magazine "ACS nano" on.
The first author of the paper, Xiong Xun-hui, an associate professor of environment and energy at South China University of Technology, told reporters from Science and Technology Daily that sodium ion batteries work in a similar way to lithium-ion batteries. Both ion-exchange and positive-ion ionization processes charge and discharge electricity. However, the former is less costly because of its abundant sodium resources and its safety is higher because of its high voltage platform. However, due to the unsatisfactory properties of the existing sodium ion electrode materials, looking for suitable electrode materials has been the key to the development of sodium ion batteries since the 1980s.
Xiong Xunhui and the United States, Georgia Institute of Technology School of Materials Science and Engineering Professor Liu Meilin and other developed a simple method that commercial antimony sulfide and graphene oxide in the sodium sulfide solution after mixing, and then by controlling the crystallization and sintering Preparation of modified graphene and nano Antimony sulfide composites. The material and sodium sheet assembled into a half-cell, the capacity retention rate is still as high as 83% after 900 cycles of fast charge and discharge (charge and discharge for about 40 minutes).
Through theoretical calculations, the researchers proved that the modified graphene has better fixing effect on antimony sulfide and its discharge products, can effectively stabilize the structure of the material and prevent the active material from falling off from the graphene. Compared with the previous reports, the composite material has the best cycle performance of the antimony-based anode material of the sodium ion battery, which makes the sodium ion battery a big step forward.
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