Research Of Cathode Materials Of Lithium Sulfur Battery

Because the fossil energy such as coal oil gradually reduce, other available energy power for the people in the future will be dominated, another need to synchronize the development of the technology is to store the energy in a way that is portable. now be converted into other energy supply of energy is the key of the current development of science and technology, so the new energy has gradually showed a unique "advantage", such as lithium batteries, it has high energy storage, low pollution, low price of gradually got the trust of the masses,The lithium battery can be divided into multiple directions, Li Mn2O4 lithium batteries, lithium sulfur batteries, etc. The first now,the most widely used is lithium batteries, lithium sulfur batteries are the highest lithium batteries, Li Mn2O4 battery of specific capacity is 157 m Ah/g, and lithium sulfur batteries specific capacity is 1675 m Ah/g, much higher than Li Mn2O4 lithium battery, lithium sulfur batteries is the most development direction in the future.Lithium sulfur batteries is so high specific capacity, however, there is no real commercial production, because it has some difficult to be overcame, the first,because of elemental sulfur is the S8 at room temperature, and have no electrical conductivity, it must join the conductive material to show the capacity of the S, and the proportion of conductive material cannot be too high,it will reduce the capacity and impact performance, the second, charge and discharge can produce more sulfide, such polysulphide dissolve in the electrolyte, then can significantly inhibit the battery charge and discharge performance, It is obvious that the lithium battery charge and discharge cycle is not stable. Lithium sulfur batteries have two Two main obstacles.To solve sulfur conductive is to add various forms of carbon for carbon and sulfur compound conductive materials, thus forming the positive composite materials. This is the most perfect way, now do general quality proportion of S:C = 3:1, carbon sulfur compound by solid phase method, the effect of carbon adsorption on the surface of carbon is to make the sulfur and carbon as the role of connecting wires, such as mesoporous carbon, sulfur can enter the hole of carbon, such already can improve the electrical conductivity of sulfur, and can reduce the elemental sulfur contact with the electrolyte.To solve the decrease of polysulfide, the first,the mixture of metal oxides is filled into carbon sulfur composite, a nanometer transition metal oxide is using its unique adsorption, adsorption on the surface or carbon sulfur, effective inhibition of sulfur and the electrolyte contact area, thus reducing the formation of more opportunities of sulfide, so as to achieve the ideal effect, metal oxides such as Ti O2, Ni O, Co3O4, etc.The second,the method is coated and filled from the electrolyte sulfur, it is the most effective, but the difficulty is also the biggest, it is directly coated on the surface of sulfur compound material with a layer of conductive material, and does not react with the electrolyte, it can be very effective to display the specific capacity of sulfur, now generally use the latest graphene coating method is the oxide graphene quality ratio is 1%, the second is populated, the prepared hollow ball production is completed, and then it will comply with the material to fill the hollow ball inside, it is achievement. Now filling the hollow ball In2O3, because of its specific capacity with sulfur, and does not react with the electrolyte. Through the experiment obtained reliable data to prove the series of inference.