| Lithium-sulfur battery has a very high theoretical specific capacity and specific energy density, which is considered as the most promising alternative to fossil fuel. However, due to the conventional lithium-sulfur batteries containing liquid electrolyte, the problem of dissolving polysulfides unresolved. This article explores and studies a new all-solid-state batteries, which does not contain any liquid electrolyte, hoping to propose a new scheme to solve this problem.In this paper, all solid polymer electrolyte(PEO) as a new type of lithium-sulfur battery electrolyte, to solve the problem of its low conductivity at room temperature,. We add BaTiO3 nano-particles, room temperature ionic liquid(IL), EC(Ethylene carbonate) and PC(Propylene carbonate), integrating all of the advantages of additives each can be successfully applied in all-solid lithium-sulfur batteries. After a Study on the addition amount of nano-BaTiO3, we make a conclude that the addition amount of IL and IL-EC-PC complex plasticizer addition amount and composition on the electrochemical properties of the polymer electrolyte. Combined with the advantages of inorganic electrolytes LATP, studied the electrochemical properties of SPE / LATP composite electrolytes. Studies have shown that nano-particles in a certain range of BaTiO3 can increase the conductivity of the polymer electrolyte, with the increase of added amount, the conductivity is a parabola, while when the addition amount of 10wt% we get the highest conductivity. IL can greatly improve the conductivity properties, and can improve the electrochemical window. After adding various additives combines the respective strengths, the group divided into room temperature conductivity of the polymer electrolyte PEO18LiTFSI-10% BaTiO3-20% IL-5% EC-5% PC up to 7.74 × 10-4S/cm, electrical Chemistry window reaches 3V(vs. Li / Li +) and has a certain mechanical strength.The polymer electrolyte and the carbon-sulfur composite cathode material are assembled into batteries. Electrochemical tests shows that the initial discharge capacity is 350 mAh / g, maintaining 170 mAh / g after 20 cycles. After combing SPE and LATP, we test the batteries made of SPE/LATP and the cathode which shows the first discharge capacity is 400mAh/g but maintaining a small capacity after 50 cycles. Anyway, the new type Li-S battery do make some progress and a better performance in the future research. |
