Although there is no absolute gap in the development of solid-state batteries, there are still many difficulties.

There are different technical routes in the field of solid-state batteries. Solid electrolytes can be roughly divided into three categories: inorganic electrolytes, solid polymer electrolytes (SPE, SolidPolymer Electrolyte), and composite electrolytes. At present, the materials that many industry players invest in research include solid polymers, sulfides (Sulfide), oxides (Oxide), thin films (ThinFilm) and so on. For example, Sakti3 and InfinitePowerSolutions, the solid-state battery factories acquired by Dyson and Apple, are mainly thin films, but the process is complicated and mass production is difficult. Previously, there were reports of Dyson and Apple intending to give up, so the current development situation is not clear. While Toyota, Panasonic, Samsung, BMW and CATL have invested in sulfide electrolytes, Huineng and Sony have focused on oxides. Apple has been actively deploying patents for solid-state batteries and charging technology since 2012, and acquired InfinitePowerSolutions in 2013. In the past two or three years, the news of the deployment of solid-state batteries by automobile factories has greatly surfaced, such as Toyota's announcement that it will sell electric vehicles equipped with solid-state batteries in 2022. In addition, Volkswagen invested in QuantumScape, a solid-state battery start-up company co-founded by the TR35 young entrepreneur Jagdeep Singh of the Massachusetts Institute of Technology Review. Battery production line. In the past, Japan, a major battery country, has gradually abandoned lithium batteries and has shifted its research focus to solid-state batteries. Japan Science and Technology Agency (JST) and Japan New Energy Industry Technology Development Organization (NEDO) have actively promoted these developments. These developments have started the outside world. Pay attention to this technology. At present, many battery and automobile manufacturers, including South Korea's Samsung, Japan's Toyota, and my country's CATL, have increased their investment in solid-state battery research and development, and some batteries have entered the stage of loading and testing. Although the prospects are promising, the road to the development of solid-state batteries is by no means smooth due to various technical and technological problems. First, there is a lack of efficient electrolyte material systems. At present, solid-state battery materials are developing rapidly, but comprehensive applications are relatively lacking. As the core material of solid-state batteries, there have been breakthroughs in the single index of solid lithium-ion conductors, but the overall performance cannot yet meet the needs of large-scale energy storage. The solid electrolytes used in solid-state batteries nowadays generally have performance shortcomings, and there is still a big gap between the requirements of high-performance lithium-ion battery systems. 1. The interface treatment between solid electrolyte and electrode is also a major problem currently faced by solid state batteries. In the solid electrolyte, the lithium ion transmission impedance is very large, and the contact area of u200bu200bthe rigid interface with the electrode is small, and the change of the electrolyte volume during the charge and discharge process easily destroys the stability of the interface. 2. In solid-state lithium batteries, in addition to the interface between the electrolyte and the electrode, there are also complex multi-level interfaces inside the electrode. Factors such as electrochemistry and deformation will cause contact failure and affect battery performance. Third, unsatisfactory stability during long-term use is also a bottleneck in the development of long-life energy storage solid-state batteries. The structure and interface of solid-state batteries will degrade over time during the service process, but the mechanism for the impact of degradation on the overall performance of the battery is still unclear, and it is difficult to achieve long-term use. Therefore, the construction of high-performance solid-state batteries needs to start from two aspects, one is to build a high-performance solid electrolyte, and the other is to improve the compatibility and stability of the interface. If solid-state batteries are commercialized, electric vehicles will accelerate the pace of replacing diesel locomotives. Whoever masters this technology first will also have a greater say in the future competitive landscape. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: All-solid-state batteries are bound to become a trend. What are the highlights of it?