With the development of society and technology, mankind's demand for electrochemical energy storage technology is increasing, and researchers are looking for next-generation secondary batteries with higher specific energy.

　　With the development of society and science and technology, the demand for electrochemical energy storage technology is increasing, and researchers are looking for next-generation secondary batteries with higher specific energy. Lithium-sulfur batteries use sulfur as the positive electrode active material, and realize energy storage and release based on the reversible electrochemical reaction between sulfur and lithium. Its theoretical specific energy can reach 2600Wh/kg, which is 3-5 times that of current lithium-ion batteries. It is used in power batteries, portable electronic products and other fields.

　　One of the important scientific and technical problems in the field of lithium-sulfur batteries is elemental sulfur and its discharge product Li2S2. Li2S is a typical electronic and ion insulator. Therefore, the charge transfer inside the positive electrode is blocked, resulting in a low sulfur utilization rate and unable to take advantage of its high theoretical specific capacity; at the same time, the low charge transfer efficiency also affects the improvement of the battery's rate performance and other dynamic performance.

　　Recently, the research team of Chen Liwei, a researcher at the Suzhou Institute of Nanotechnology and Nano-Bionics, Chinese Academy of Sciences, has made new progress in understanding the characteristics of the charge transfer process of lithium-sulfur cathodes and promoting efficient charge transfer inside the anode.

　　Studies have shown that as the particle size decreases, the charge transport distance decreases, and the utilization rate and kinetic characteristics of sulfur materials are significantly improved. Researchers have explored ways to use size control to make the behavior of sulfur cathodes approach or to achieve the theoretical specific capacity of sulfur materials. Studies have shown that when the sulfur particle size is reduced to about 5nm and charged and discharged at a lower current density, the sulfur cathode can overcome the load transfer bottleneck and achieve a theoretical discharge specific capacity value as high as 1672 mAh/g. This work has guiding significance for realizing the efficient charge transfer of lithium-sulfur battery anode through reasonable electrode design. Recently published in NanoLett.2015,15,798.