Research progress and characteristics analysis of all solid-state thin-film lithium batteries

The key materials of thin-film lithium batteries include positive electrode membrane, electrolyte membrane and negative electrode membrane. In the thin-film all-solid-state lithium battery, the electrolyte plays a crucial role, directly affecting the charge-discharge rate, cycle life, self-discharge, safety, and high and low temperature performance of the thin-film battery. Therefore, solid electrolyte membranes are required to have high ionic conductivity, low electronic conductivity, wide potential window, and good chemical and mechanical stability. The research and commercialization of thin-film all-solid-state lithium batteries in my country started relatively late. In recent years, the research and development and industrialization of thin-film all-solid-state lithium batteries have been accelerating, and their corresponding use markets are gradually expanding. The research on three-dimensional thin-film lithium batteries is still in its infancy, and most of the research is still in the state of conceptual design and electrode preparation. There are very few reports on complete three-dimensional thin-film lithium batteries. Regarding the all-solid-state thin-film lithium battery using metal lithium as the negative electrode, the construction of the three-dimensional nanostructure of the positive electrode material is particularly important, and its performance directly determines the performance of the full battery. However, the difficulties in the construction of three-dimensional cathode materials have always restricted the research and development of three-dimensional solid-state thin-film batteries. Solid-state lithium batteries can produce flexible and thin-film batteries, which can be used more quickly in 3C product design. In addition, the improvement of thermal stability accelerates the use of thin-film lithium batteries in special applications, such as implantable and smart medical equipment, and wireless sensors. There is a huge potential market for other applications. There is still a big gap in the maturity of thin-film all-solid-state lithium battery technology in China compared with the international ones. The detailed performance is as follows: ① China’s research and development of the key material system of thin-film all-solid-state lithium batteries started late, and it is in the thin-film battery There is also a lack of systematic research on large-scale preparation, the design and manufacture of battery packs, battery sealing protection layer, packaging technology, failure mechanism, performance evaluation standards, etc.; ②In terms of hardware such as vacuum coating equipment necessary for thin-film battery preparation, and necessary sputtering In terms of target materials and other raw materials, China lacks relevant research and development experience compared with international companies such as US Materials Corporation and Japan Afac, and there are very few public reports; ③For the use of thin-film batteries, foreign companies such as Cymbet have achieved The use of thin-film all-solid-state lithium batteries in micro-electronic devices, while there are currently no thin-film battery products available for sale in China, and there is no public report on commercial use. Therefore, exploring high-efficiency and low-cost cathode thick film preparation technology is the key to the further development and industrial use of thin-film all-solid-state lithium batteries in the future. With the continuous deepening of research and the continuous emergence of new technologies, it is believed that the single cell capacity and energy density of thin-film all-solid-state lithium batteries will continue to increase, and the manufacturing costs will continue to decrease, and they will occupy an important place in the future secondary battery market. Features of thin-film all-solid-state lithium batteries Thin-film all-solid-state lithium batteries have a perfect electrode/electrolyte solid-solid interface, which can effectively deal with the safety issues of current commercial lithium batteries, and has an ultra-long cycle life and a wide operating temperature. The advantages of range, lower self-discharge rate, etc., are superior to bulk solid-state lithium batteries, and have received extensive attention from the industry. Thin-film all-solid-state lithium batteries can be used in more demanding environments, such as stronger resistance to high and low temperatures, and good performance at low temperatures of -40°C and high temperatures of 150°C, so they can be used in high temperature detectors in the semiconductor industry and petroleum exploration And space detection. The electric potential of the film electrode is uniform, and the risk of local overcharge and overdischarge of the electrode is small. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete.