What are the problems and disadvantages of lithium-sulfur batteries

1. Short cycle life: Lithium polysulfide flying shuttle, lithium polysulfide disproportionation, electrolyte analysis, metal lithium dendrite powdering, etc. 2. Poor conductivity: Sulfur, as a non-conductive substance, has very poor conductivity, which is not conducive to High-rate performance of the battery 3. Low performance: unable to meet the requirements of large-scale industrial development 4. Low stability: During the charging and discharging process of sulfur, the volume is enlarged and reduced very greatly, and the huge volume change will destroy the electrode structure 5 The density of sulfur and lithium sulfide are 2.07 and 1.66gcm-3, respectively. There is up to 79% volume expansion/shrinkage during charging and discharging. The expansion will cause the capacity to decline. For the problem of poor cycle performance, a research team introduced cations in the electrolyte to complex polysulfide ions, which effectively improved the stability of lithium polysulfide in the electrolyte. The lithium-sulfur battery using the lithium-sulfur battery electrolyte has an energy of up to 300Wh/kg, and has a stable cycle for more than 100 times, and the capacity retention rate is about 70%. The most important thing is to adopt measures such as solid electrolyte, gel electrolyte or adding LiNO3 ionic liquid to the electrolyte to increase the utilization rate of active material sulfur, so as to achieve the purpose of improving the cycle performance of lithium-sulfur batteries. Regarding the modification of sulfur-based composite cathode materials, it is important to combine a matrix material with good electrical conductivity and a specific structure with elemental sulfur to prepare high-performance sulfur-based composite cathode materials. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete.