According to foreign media reports, a research team at the University of Manchester has developed a cathode doped with graphene to achieve a highly stable lithium-sulfur battery. The researchers said in the paper that the storage capacity of lithium-sulfur batteries made of this cathode material has increased by 100%, and can withstand 500 times of charging when charging at 0.5 C, 1 C, 2 C and 3 C charging power Charge and discharge cycle. The cathode combines laser-synthesized sulfur (S) and nitrogen (N) -doped graphene electrodes (without binder) and nanoparticles loaded with molybdenum sulfide (MoS2). The nitrogen-sulfur-doped porous graphene structure enhances the adsorption capacity of the interface by generating sulfur dioxide. Sulfur dioxide can chemically combine with sulfur by promoting oxygen-containing functional groups to inhibit the diffusion of polysulfides to the electrolyte. Low electrolyte resistance, low interphase contact resistance, and low charge transfer resistance accelerate electron and lithium ion transport in graphene doped with laser-induced nitrogen and sulfur. In theory, the specific capacity of lithium-sulfur batteries is very high, up to 1675 mAh / g, and the energy density is also high, up to 2600 Wh / kg, which is a potential choice for future batteries. Although the actual energy density of a lithium-sulfur battery is only 550 to 660 Wh / kg, which is 20% of the theoretical energy density, this level of energy density has been achieved in a lithium-sulfur battery made with a LiCoO2 cathode. Therefore, to achieve a higher level of capacity and energy density is one of the main challenges facing lithium-sulfur batteries, and low cycle stability also hinders the practical application of lithium-sulfur batteries. Soluble lithium polysulfide is the key factor causing the "shuttle" effect in the electrochemical reaction of sulfur cathodes, which will lead to low cycle stability of lithium-sulfur batteries. Therefore, the scientists used a pulsed UV (ultraviolet laser) direct write technology to form sulfur and nitrogen-doped graphene electrodes loaded with multiple nanoparticles (such as silver, platinum, silicon and molybdenum sulfide), in which Molybdenum is made from an organic ink with a special formula and a variety of particles. This process is a one-step molding process and does not require a binder to form a cathode collector for a lithium-sulfur battery. This process allows lithium-sulfur batteries to withstand long-term charge and discharge cycles, and hardly reduces their storage capacity. (Author: Yuqiu Yun)
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