Although lithium-ion batteries have been used in all aspects of people's lives, scientists have always believed that sodium-ion batteries are safer and less expensive than lithium-ion batteries in terms of large-scale energy storage, but they cannot be used in the short term due to their short life. Recently, Chinese and American scientists have jointly developed a new structure of ruthenium sulfide-based anode materials, which has increased the sulfonium sulfide-based sodium ion battery from no more than 500 cycles to 900 cycles. The life expectancy is almost comparable to that of lithium batteries . It is 1.5 times the capacity of the anode material (graphite) of lithium ion batteries. Related results were published in the top nanotechnology magazine "ACS Nano".
The first author of the paper, Xiong Xunhui, associate professor of the School of Environment and Energy, South China University of Technology, said in an interview with the Science and Technology Daily that sodium-ion batteries work similarly to lithium-ion batteries, and they use ions to achieve charge and discharge between the positive and negative electrodes. However, the former is rich in sodium resources and lower in cost, and because of its high voltage platform, it is safer. However, due to the unsatisfactory performance of existing sodium ion electrode materials, finding suitable electrode materials has been the key to the development of sodium ion batteries since the 1980s.
Xiong Xunhui and Professor Liu Meilin of the School of Materials Science and Engineering at the Georgia Institute of Technology in the United States have developed a simple method of mixing commercial barium sulfide with graphene oxide in a sodium sulfide solution, and then preparing modified graphene and nano by controlling crystallization and sintering. A composite of barium sulfide. When the material and the sodium sheet were assembled into a half-cell, the capacity retention rate was still as high as 83% after 900 cycles of rapid charge and discharge (completed after charging and discharging for about 40 minutes).
The theoretical calculations show that the modified graphene has a better fixing effect on strontium sulfide and its discharge products, which can more effectively stabilize the structure of the material and prevent the active material from falling off the graphene. Compared with the existing reports, the composite material has the best cycle performance of the sodium ion battery ruthenium based anode material, which makes the sodium ion battery application a big step.
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