L1022 battery

　　CATL/Tianci Materials L1022 battery technology analysis

　　Judging from the L1022 battery technology patents of CATL and Tianci Materials, there is still a way to go before we can fully control it.

　　In the past two years, calls for solid-state batteries have become increasingly popular. However, due to issues such as cost, safety and raw materials, the large-scale mass production and mature application of solid-state batteries still have a long way to go.

　　From the perspective of domestic companies, lithium battery companies such as Qingtao Energy, Huineng Technology, Ganfeng Lithium Industry, Wanxiang 123, Weilan New Energy, Jiawei Co., Ltd., and Judian New Energy are all building L1022 battery production lines. Some have even been put into production.

　　Gaogong Lithium Battery reviewed the patents and found that in terms of L1022 battery technology exploration, the more prominent ones include Contemporary Amperex Technology (CATL), Tianci Materials, Tianjin Lishen, Zhuhai Guanyu, Shenzhen BAK, Shenzhen Advanced Research Institute, and Chinese Academy of Sciences Ningbo Materials Research Place. Typical representatives include CATL and Tianci Materials.

　　CATL: Solid-state lithium metal battery

　　The rigid diaphragm and solid-state lithium metal battery patents applied by CATL use metallic lithium as the anode and take advantage of the advantages of lithium specific capacity of 3860mAh/g and electrochemical potential of -3.04V to achieve an energy density of more than 400Wh/kg. On the other hand, it solves the problems of safety and cycle life, effectively improves the cycleability of solid-state lithium metal batteries and reduces the probability of short circuits.

　　The general implementation is shown in Figure 1-Figure 2, and the steps are divided into four steps. In the first step, the active material, sulfide solid electrolyte, conductive agent, and binder styrene-butadiene latex are mixed in the THF solvent according to weight ratio. Then the surface of the aluminum foil is coated, dried at 60°C, cold pressed, and sliced to obtain LiCoO2 cathode active material and a cathode plate with a thickness of 50um.

　　The second step is to mix the sulfide solid electrolyte and the binder into the THF solvent according to the weight ratio. It is then coated on the glass surface and dried to obtain an electrolyte membrane. After slicing, a solid electrolyte membrane with a thickness of 50um is obtained.

　　The third step is to slice the aluminum foil into rigid diaphragms. The lithium metal is then attached to the surface of the copper foil and sliced into anode pieces.

　　In the fourth step, the cathode plates, solid electrolyte diaphragms, rigid diaphragms, and anode electrode plates are aligned and stacked in order, and cold-pressed for 2 minutes under certain conditions to obtain the battery cell unit, which is then stacked and packaged to form a solid-state lithium metal battery.

　　The advantage of this patent from CATL is that it can inhibit the extension or penetration of lithium metal anode into the solid electrolyte membrane, reducing the probability of short circuit during the preparation process of solid-state lithium metal batteries. At the same time, the rigid film forms an alloy with the lithium deposited during the charging process of the L1022 battery, which can reduce the probability of short circuit during charge and discharge cycles and improve the cycle stability of the solid-state lithium metal battery.

　　God-given material: L1022 battery

　　A patent for a L1022 battery preparation method applied by Tianci Materials can effectively improve the intrinsic characteristics and electrochemical performance of the battery, improve the ion conductivity of the solid electrolyte, and the preparation process is simple, repeatable and mass-produced, and has significant application promotion value.

　　The general steps of Tianci Materials' patent implementation are to first mix the positive electrode material lithium nickel cobalt aluminate and the solid electrolyte lithium silicon aluminum nitrate powder, cast it with collodion to form a film, and punch it to prepare the positive electrode sheet. The solid electrolyte lithium silicoaluminonitrate is then cast into a film using collodion, and then die-cut to prepare solid electrolyte sheets.

　　The positive electrode sheet and the solid electrolyte sheet are stacked and sintered by hot pressing, and then covered with a lithium negative electrode. After cold pressing, an all-L1022 battery with a sandwich structure is formed.

　　The positive electrode sheet is combined with the solid electrolyte and hot-pressed because both materials can withstand a certain amount of heat. Hot-pressing can make the contact between them closer and reduce the interface impedance.

　　The negative electrode is cold-pressed and consists of lithium metal or alloy, which has a low melting point and ductility. Cold pressing makes the interface between the negative electrode sheet and the solid electrolyte fully contact without causing them to penetrate into the solid electrolyte and cause a short circuit in the battery.

　　As shown in Figure 5, an example of this patent of Tianci Materials was tested for the first time Coulombic efficiency. The charge and discharge rate was 0.1C, and the electrochemical stability showed good performance.

　　Shenzhen Advanced Research Institute: All-solid-state secondary battery

　　The all-solid-state secondary battery patent of the Shenzhen Advanced Research Institute can solve the problems of existing all-solid-state batteries such as interface gaps, large interface resistance, unstable interfaces, and lithium dendrite growth. The process is simple and convenient for industrial production.

　　The general implementation steps, as shown in Figure 1, reduce the gap and high interface resistance between the electrode material and the solid electrolyte layer by placing a gel polymer coating between the electrode and the solid electrolyte. At the same time, possible side reactions and lithium dendrite growth at the interface are suppressed, and the electrochemical performance is better.

　　It is worth mentioning that the gel polymer coating material used in this patent is easily available, environmentally friendly, has a simple production process and is low cost.

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