Institute of Physics and Chemistry: Significant progress has been made in the field of high-performance lithium-sulfur battery research

　　As a positive electrode material for lithium-ion batteries, the high theoretical capacity of sulfur (1675mAhg? 1) has attracted great attention. However, sulfur has shortcomings such as non-conductivity, lithium polysulfide as an intermediate product, soluble in electrolytes, and serious volume expansion. These problems make the large-scale application of lithium-sulfur batteries face many challenges, including safety, rate performance, and cycle stability.

　　In order to overcome these problems, the Functional Polymer Materials Research Center of the Institute of Physics and Chemistry has developed a new method of in-situ preparation and loading of sulfur in a three-dimensional porous carbon (3DPGC) structure. The loading of sulfur reaches 90% under the premise of maintaining nano-dispersion. %, creating a record for the highest loading of sulfur. The initial specific capacity of the electrode is as high as 1382mAhg-1; the in-situ loading of sulfur also forms carbon-sulfur bonds, which significantly improves the charge-discharge cycle stability of the electrode material. After 1000 cycles, The average capacity attenuation per cycle is only 0.039%, reaching the current highest cycle stability. Therefore, this material not only improves the sulfur load and utilization efficiency, but also improves the charge-discharge cycle stability of the electrode material 3DS@PGC, which opens up new ideas for the design of a new generation of lithium-ion battery electrode materials.