Polypyrrole lithium sulfur battery material

Abstract

The invention discloses a polypyrrole lithium sulfur battery material which comprises a positive electrode and a negative electrode. The material is characterized in that the positive electrode includes a current collector, an active material a and an active material b, wherein the weight ratio of a to b is 1:20 to 30. According to the invention, the composite active material a composed of polypyrrole and acetylene carbon black and the composite active material b composed of elemental sulfur and porous carbon are blended and dried to enhance the tight bonding between the composite active material a and the carbon sulfur composite material; the dissolution of sulfur and a discharge product in an electrolyte is inhibited; the 'shuttle effect' is prevented; the utilization rate of sulfur is improved; and the cycle stability and capacity retention rate of the finished material are improved.

Description

technical field [0001] The invention belongs to the technical field, and in particular relates to a polypyrrole lithium-sulfur battery material. Background technique [0002] In recent years, with the decline of oil production and the intensification of global environmental pollution, countries around the world have generally recognized that clean and pollution-free electric vehicles to replace fuel vehicles is an inevitable choice for a country's sustainable development. The power battery technology with high specific capacity has become the key to the development of pure electric vehicles. At the same time, the rapid development of communication technology, space technology, and national defense industry has also greatly promoted the demand for small-volume, high-capacity rechargeable batteries. At present, lithium-ion batteries using lithium cobalt oxide, lithium manganese oxide, and lithium iron phosphate as positive electrode materials are limited by theoretical specif...

AI Technical Summary

Problems solved by technology

At present, lithium-ion batteries using lithium cobalt oxide, lithium manganese oxide, and lithium iron phosphate as positive electrode materials are limited by theoretical specific capacity, so it is unrealistic to further increase their capacity and energy density;

[0003] Therefore, it is particularly critical and urgent to develop high-capacity, low-cost cathode materials for lithium-ion batteries. At present, there are still some problems in lithium-sulfur batteries, such as the poor conductivity of elemental sulfur and its reduced product lithium sulfide, which leads to low utilization of active materials. Low battery capacity retention, etc.