The flaws of the solid-state lithium secondary battery and solution

Source: 2020 - 03 - 30 clicks to them: time, all the defects of solid lithium secondary battery and part of the process though solid-state lithium secondary battery has obvious advantages in many aspects, but there are still some problems to be solved. In order to solve these problems, engineers have made various attempts, and gives some possible solution, shown in the following table: 4. The central information ( 1) Solid electrolyte solid electrolyte is the core component of solid lithium secondary battery. Solid electrolyte research mainly concentrated in the three groups of materials: polymers, oxides and sulfides. Solid polymer electrolyte ( SPE) The polymer matrix ( Such as polyester, polyether, polyamine, etc. ) And lithium ( For example, LiClO4 LiAsF6, LiPF6, etc. ) Since 1973, p. v。 Wright in alkali metal salt complex ionic conductivity, high polymer material because of its light quality, good elasticity, the characteristics of the solid-state electrochemical machining performance, attracted a lot of attention. The Spe was also the first solid electrolyte used in practice. Oxide solid electrolyte according to the structure of materials can be classified into crystalline and amorphous, crystalline electrolytes including perovskite type, the perovskite type, garnet, sodium, tin groove, the pass of the lithium ion, etc. Amorphous oxide research mainly focused on the lipid for film battery electrolyte and fractional crystallization of amorphous data. Sulphide solid electrolyte from the oxide solid electrolyte, including oxide oxygen replaced by sulfur element in the body. Because the electronegativity of sulfur is smaller than oxygen, it combined with lithium ions not so close together, make the lithium ion can move more freely. In general, sulfur radius is larger than the radius of the oxygen. When sulfur instead of oxygen, expanding lattice structure, the formation of larger lithium ion channels, the conductivity increases, up to 10 - at room temperature 4 - 10 - 2s /cm。 ( 2) Positive data solid-state lithium secondary battery anode is usually a composite electrode. Besides of electrode active material, including solid electrolyte and conductive agent, the conductive agent conduct ions and electrons in the electrode. The main research the LiCoO2, LiMn2O4 and LiFePO4. The late development of high content of nickel oxide layer, rich spinel lithium manganese and high nickel manganese anode. Also should pay attention to research and develop new data do not contain the positive electrode of the lithium. ( 3) 。 Negative data solid-state lithium secondary battery cathode data are divided into three categories: lithium anode data, a carbon negative electrode and metal oxide anode data. Each have advantages and disadvantages of these three data, including lithium metal anode data because of its large capacity, low potential advantages, has become a solid-state lithium-ion battery as one of the most important cathode data.