Four challenges faced by the development of all-solid-state lithium batteries

The development of all-solid-state lithium batteries faces four challenges. Recently, the governments of China, Japan, and the United States have proposed policies for the development of power lithium-ion batteries. From the perspective of technical policies, the central policy is energy density, and energy density is getting higher and higher. 300 watt-hours per kilogram increased to 500 watt-hours per kilogram. How to achieve these ultra-high energy density policies, combined with the overall safety, life, and cost of power lithium-ion batteries, is a problem facing many developers. From a technical point of view, the current important power lithium-ion battery is still positive data matching the negative information of artificial graphite, and then increasing the energy density, may introduce silicon anodes, the problem of volume expansion is difficult to deal with, followed by silicon The anode has replaced lithium metal. It has been developed in 1972 and lasted for more than 50 years. There are many. The key problem to be solved is that most of the current research is still in organic solvents. The first problem in organic solvents is that it is not like graphite. The lithium in the anode enters and exits like that, right or wrong, and even separate. The second is the spontaneous reaction with the electrolyte, and the volume change is also relatively large. Therefore, the lithium battery VCR film cannot be stable and safe, and the self-discharge cannot meet the needs. Many companies and research teams have placed their expectations on solid-state lithium batteries. The solid-state battery and the formed micro-battery are a three-layer structure. Just now, the electrolyte of the solid electrolyte diaphragm is replaced. This is a typical photo. There is no essential difference. Maybe it is the central cathode metal lithium. In this case, the positive side, the original The liquid can completely wet the anode particles, which is very difficult on the positive side of contact. From the point of view of our expected advantages, if metallic lithium is used, only simple burning and blasting of the liquid electrolyte are required, in addition to the service life. It is our expectation to expand the module configuration and so on. These data need to be further tested in practice. In 2007, when the roadmap announced by Japan NEDO in 2008, in 2030, many battery forms will show solid-state methods in the long-term, including metals. Lithium, lithium-sulfur and lithium-air batteries, route adjustments, but generally speaking, are a solid strategy to improve safety. In the newspaper, the US$20 million project in 2016 supports the development of various solid electrolytes and solid electrolyte manufacturing skills. Now in our country, in the past three years, the group has been engaged in solid-state battery development. Development, display device, capable of developing a small team, from south to north development team. Now, in general, the development of all solid lithium batteries faces four challenges. One is how to meet the positive and negative problems in the electrode layer and the ion transmission of solid electrolytes, especially in the circulation process, and the second is positive. And the negative data flow process cannot maintain good contact with the liquid. The volume of lithium metal electrodes has also changed. The volume of solid lithium has also changed. Next, in 2013, the Chinese Academy of Sciences decided to select a special nano-pilot project. It is proposed to make a long-distance power lithium-ion battery and extend the driving distance of electric vehicles by adding energy density. The proposed policy is 300 watt-hours per kilogram, which is the same as the current national mission. This includes the technology of the third-generation lithium battery, including current solid-state batteries, lithium-sulfur batteries and lithium-air batteries, including 12 research units, 24 PIs, and 400 people, all of which are being processed dynamically. I briefly said that once the pilot project develops, some samples of high-energy density lithium ion, lithium, and lithium sulfur will be developed. The air is to establish a high-level diagnostic analysis channel, and introduce the appearance of inorganic phosphate lithium metal lithium to do homework and improve it. Safe sex, it is done by Chemistry, Dr. Guo. They recently developed polyether acrylate, which is a very important breakthrough. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous article: How to judge whether the battery of an electric car should be replaced?