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 cheaper 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 span. Recently, scientists from China and the United States jointly developed a new type of yttrium sulfate-based negative electrode material, which has increased the volume of yttrium sulfide-based sodium-ion batteries from no more than 500 cycles to 900 cycles. The lifetime is almost comparable to that of lithium batteries, and the specific capacity It is 1.5 times the capacity of the negative electrode material (graphite) of the lithium ion battery. Relevant results were published in the nano magazine ACS Nano.
The first author of the paper, Associate Professor Xiong Xunhui of the School of Environment and Energy, South China University of Technology, said in an interview with a reporter from Science and Technology Daily that the working principle of sodium-ion batteries is similar to that of lithium-ion batteries. However, the former is less expensive because of its rich sodium resources, and because of its high voltage platform, the safety is higher. However, due to the unsatisfactory performance of the existing sodium ion electrode materials, from the 1980s until now, finding suitable electrode materials has been the key to the development of sodium ion batteries.
Xiong Xunhui and Professor Liu Meilin of the School of Materials Science and Engineering of the Georgia Institute of Technology have developed a simple method of mixing commercially available antimony sulfide and graphene oxide in a sodium sulfide solution, and then preparing modified graphene and nanometer by controlling crystallization and sintering. Strontium sulfide composites. When the material and sodium tablets were assembled into a half cell, the capacity retention rate was still as high as 83% after 900 cycles of rapid charge and discharge (about 40 minutes after charging and discharging).
The researchers calculated through theoretical calculations that the modified graphene has a better fixing effect on the bismuth sulfide and its discharge products, and can more effectively stabilize the structure of the material and prevent the active material from falling off from the graphene. Compared with the existing reports, the composite material has the best cycling performance of the sodium-ion battery thorium-based anode material, which makes the application of the sodium ion battery a big step forward. (Reporter Jiang Jing)
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