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release time:2024-03-16 Hits: Popular:AG11 battery
battery cell 18650 research achieves breakthrough progress
Recently, the research group of Professor Xu Maowen from the Department of Materials and Energy of Southwest University has made important progress in the design and development of high-performance lithium-sulfur batteries. The relevant research results were published in the top international energy journal "Advanced Energy Materials" (Advanced Energy Materials) under the title "Double-ShelledNiO-NiCo2O4Heterostructure@CarbonHollowNanocagesasAnEfficientSulfurHostforAdvancedLithium-SulfurBatteries", with an impact factor of 16.72. The school is the first unit to complete this achievement. Master students Hu Linyu and Dai Chunlong are the co-first authors of the paper, and Professor Xu Maowen is the corresponding author.
With the increasingly severe environmental problems and the rapid development of electronic and electric equipment, it is imperative to design and develop efficient energy storage equipment. Lithium-sulfur batteries are considered to be one of the most promising energy storage systems of the next generation due to their high energy density, high theoretical capacity, abundant sulfur cathode resources, low price, and environmental friendliness. However, due to the poor conductivity of the sulfur cathode material and its discharge product lithium sulfide, the volume effect and the "shuttle effect" during the charge and discharge process, the utilization rate of sulfur in the battery is low, the capacity decays quickly, and the rate performance is poor, which seriously hinders the development of the battery. The commercialization process of lithium-sulfur batteries.
In response to these problems, Professor Xu Maowen's research group designed and synthesized a double-layer core-shell NiO-NiCo2O4 heterojunction @C hollow nanocage as a sulfur carrier, and it was used in lithium-sulfur batteries for the first time. This hollow structure can not only provide sufficient space for the storage of sulfur, but also effectively cope with the volume effect during the sulfur charge and discharge process; in addition, the NiO-NiCo2O4 heterojunction nanocage can take advantage of the unique advantages of its own composition to effectively inhibit polysulfide The dissolution and diffusion of substances and the promotion of the kinetic process in their conversion reactions alleviate the shuttle effect of the battery, fully embodying the advantages of heterojunctions. Based on this unique design, this material serves as the cathode of lithium-sulfur batteries and exhibits high specific capacity and good cycle stability.
This research work was funded by the National Natural Science Foundation of China and the Central Universities Basic Business Funds Project, and was completed in collaboration with Dr. Chen Yuming of the Massachusetts Institute of Technology.
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