Synthesis And Electrochemical Properties Of Aluminum-Sulfur Battery Based On Organic Sulfur Copolymer As Cathode

The industrial revolution has brought about rapid industrial development.Along with the development,environmental problems,ecological destruction and resource shortage have become three prominent problems which we facing nowdays.Lithium ion battery has been nature and stable.With the widespread application of lithium ion battery,its disadvantages also present out gradually.The cost of lithium and its limited earth crust reserves are the major disadvantages of its development.Aluminum is the third most abundant element in the earth’s crust,which is secure and eco-friendly.Its theoretical specific capacity is as high as 2980 mAh g-1.Nevertheless,aluminum has become the first choice for new energic storage battery cathode materials.Organic sulfur copolymers have a specific capacity comparable to the elemental sulfur.Organic sulfur copolymer,as the cathode material of lithium-sulfur battery,can show high charge/discharge capacity and special cycle life.Organic sulfur copolymers have not been reported as cathode materials for aluminum-sulfur batteries.In this paper,organic sulfur copolymer was synthesized by elemental sulfur through reverse vulcanization as the positive active substance of aluminum sulfur secondary battery,and the electrochemical performance of aluminum-sulfur battery has been done detailed research,mainly including the following four parts:(1)The specific copolymer of the Poly(S-r-DIB)was synthesized by inverse vulcanization by elemental sulfur and DIB(1,3-diisopropylbenzene),and the Poly(S-r-DIB)of different proportions was synthesized by controlling the mass ratio of DIB,and it has been successfully used as the cathode material for aluminum-sulfur batteries for the first time.Organic sulfur copolymers maintain cyclic stability through linear structure to ensure the storage capacity of metal ions.(2)Exploring different factors which affectied the electrochemical performance of aluminum-sulfur battery through experiments.The effects of different binder contents on the electrochemical performance of aluminum-sulfur through charging and discharging platform and specific capacity were investigated.When the sulfur mass ratio is determined to be 30%,at charging current intensity of 1 A g-1,after 100 cycles,the specific discharge capacity is as high as 1200 mAh g-1,which is much higher than the specific capacity of traditional aluminum-sulfur battery.(3)By changing the electrolyte,the effect of electrolyte on the performance of aluminum-sulfur battery was studied.The electrochemical performance of aluminum-sulfur battery in the ionic liquid of AlCl3 and urea,acetamide and sulfocarbamide was tested.The composition,phase and crystal structure of the cathode materials were analyzed by SEM,XRD,TEM,TGA,DSC and FTIR,and the reaction mechanism was explored.(4)The aluminum-sulfur battery is designed as the energy storage unit of the distributed generation system,and reasonable and efficient control strategies are designed according to the different working states of the energy storage unit,so that the energy storage system can accord to the requirements of the distributed generation system with energy storage.Based on the above research results of this paper,the work is applicable to further explore more alkenes and elemental sulfur for inverse vulcanization products as the cathode material for aluminum-sulfur batteries.