Application Research Of Sulfur-containing Organic Matter In Energy Storage Battery

Energy and environmental issues have become one of the major issues that mankind must address in the 21 st century.The auto industry,which has a history of 135 years this year,has seen a sudden rise in new energy vehicles in recent years.China is also expected to overtake the curve of the auto industry by leveraging the Dongfeng of new energy vehicles.However,the current battery life of electric vehicles is far worse than that of fuel vehicles,and safety issues such as self-ignition of electric vehicles are often reported.As a result,consumers have been unable to fully recognize electric vehicles.The core component in electric vehicles is the battery,and the most commonly used battery today is the lithium-ion battery,which cannot meet the current high requirements for battery life of electric vehicles,and it is gradually unable to meet the requirements of high-power portable electronic devices.A solid Li-S battery composed of a Li-S battery system with a higher specific capacity and a solid electrolyte can simultaneously solve the various problems mentioned above.Because the solid electrolyte replaces the liquid electrolyte,the Li-S battery The most common "shuttle effect" was well suppressed.Because solid-state Li-S batteries use a solid-state electrolyte,compared with current commercial lithium-ion batteries that use flammable organic solvents as the electrolyte,the safety of solid-state Li-S batteries has been greatly improved.High capacity and safety make all-solid-state Li-S batteries one of the development directions of the secondary battery industry in the future.The research on Li-S batteries mainly focuses on sulfur-carbon composite materials,solid electrolytes,manufacturing efficient electrodes,battery configurations,and the attenuation mechanism of Li-S batteries.This subject will be researched based on the fabrication of highly efficient electrodes and the preparation of polymer sulfur-based electrolytes.The main contents are as follows:(1)Preparation of high-performance sulfur-carbon positive electrode using a vulcanization accelerator.The effect of vulcanization accelerator on vulcanization of polyacrylonitrile(PAN)was studied.By comparing the sample obtained from the vulcanization accelerator and the blank sample PAN-S-VA,elemental analysis shows that the sulfur content of the sample using VA increased by 8%.The cycle performance of batteries using PAN-S-VA as a positive electrode is also significantly improved compared to PAN-S without VA.(2)Utilizing the experience accumulated during the research of sulfur-selenium solid cathodes,we started to study the sulfur chain for Li +,and then began to study the related issues of polysulfur electrolytes.The study found that the polysulfide electrolyte has a high ionic conductivity,which can reach 2.33 × 10-4 S cm-1 at room temperature.Through a series of analysis and characterizations such as DSC,it is found that the conduction mechanism of Li + between polysulfide electrolyte and common polymer electrolytes such as PEO is different.The conduction of Li + in polysulfide electrolyte depends on the chemical environment where Li + is located.Polysulfide electrolyte has good thermoplasticity,and can be made into polysulfide electrolyte films with different thicknesses by hot rolling.Due to the special nature of sulfur,a sandwich structure(PAN / Poly-S / PAN)is introduced to protect the polysulfide electrolyte.The protected polysulfide electrolyte can stably circulate in the S-PAN positive battery,and has good electrical properties.Chemical cycling performance.