Important Progress in Lithium-Sulphur Battery Research

Recently, Professor Xumaowen of the Department of Materials and Energy of Southwest University made important progress in the design and development of high-performance lithium sulfur batteries. The relevant research results were published in the International Energy Journal "Advanced Energy" on the topic of "Doubly-Shelled NiO-NiCo2O4 Heterostructur CarbonhollowanocagasAnefficiicient". The advanced energy factor is published in the International Energy Journal "Advanced Energy". The school is the first completed unit of this achievement. Master students Hulinyu and Daichunlong are the co-authors of the paper, and Xumaowen is the communication author.

With the increasingly serious environmental problems and the rapid development of electronic 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 for the next generation due to their high energy density, high theoretical capacity, abundant sulfur positive resources, low price, and environmental friendliness. However, due to the poor conductivity of sulfur positive electrode materials and their discharge products, the volume effect during the charging and discharging process, and the "shuttle effect", the utilization rate of sulfur in the battery is low, the capacity decays quickly, and the performance of the multiple rate is poor. It seriously hinders the commercialization of lithium sulfur batteries.

In response to these problems, Professor Xumaowen's team designed and synthesized a double-layerspecial shell NiO-NiCo2O4 Heterojunction C hollow Nano cage as a carrier of sulfur, and used it for the first time in lithium sulfur batteries. This hollow structure not only provides sufficient space for sulfur storage, but also can effectively deal with the volumetric effect during sulfur discharge. In addition, NiO-NiCo2O4 Heterojunction nanocages can take advantage of their own unique advantages, effectively inhibit the dissolution and diffusion of polysulphide and promote the dynamic process in its conversion reaction, relieve the shuttle effect of batteries, and fully demonstrate the advantages of Heterojunction. Based on this unique design, the material is used as a positive electrode of lithium sulfur battery, showing high specific capacity and good cyclic stability.

The study was funded by the National Natural Science Foundation and the Central University Basic Operating Costs Project and completed in cooperation with Dr. Chenyuming of the Massachusetts Institute of Technology.

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