The 6th National Symposium on Solid State Batteries and the 3rd National Symposium on Metal Air Batteries was successfully held in Qingdao from December 18 to 20, 2020. The conference was hosted by Solid State Ionology Branch of Chinese Society of Ceramics and Electrochemistry Professional Committee of Chinese Chemical Society, and hosted by Qingdao University and Shandong Optical Engineering Society. Qingdao institute of bioenergy and process of the Chinese Academy of Sciences, Chinese Academy of Sciences institute of physics, Chinese Academy of Sciences, Shanghai silicate research institute, ningbo material research institute, institute of chemistry, Chinese Academy of Sciences, Chinese Academy of Sciences, changchun institute of applied chemistry, Chinese Academy of Sciences, tongji university, tianmu lake advanced energy storage technology research institute, zhejiang feng lithium new energy technology co., LTD., Beijing wei blue in collaboration with the new energy technology co., LTD. More than 600 representatives from domestic universities, research institutes, enterprises and investment institutions attended the conference.
Conference, who blue new energy forward-looking technology director Dr Xu aerospace published titled "development on high energy density high security solid-state batteries" the theme of the report, from the choice of electrode materials, auxiliary materials, batteries, structural design, solid electrolyte is introduced into, batteries and other aspects of comprehensive performance design introduces the high energy density, high security development strategy of solid-state batteries, and introduces the who blue in solid-state batteries can ratio, high security of the latest progress.
As one of the most important electrochemical energy storage devices, lithium-ion batteries have been widely used in various fields. However, the traditional liquid lithium-ion batteries have serious safety risks and are difficult to meet the needs of high energy density and high safety batteries in various fields. By replacing traditional liquid electrolyte with solid electrolyte with higher stability, it is expected to fundamentally solve the safety problem, and at the same time, it is compatible with positive and negative anode materials with higher specific energy. Therefore, it is of great significance to develop solid-state batteries with both high energy density and high safety.
In ascending battery energy density, the most fundamental way is to improve specific capacity of anode materials and electric potential difference, such as development under low potential to achieve high specific volume of the anode materials (such as high nickel three yuan, three yuan undervalued), enhance the anode material to take off the intercalated-li potential (such as high voltage cobalt acid lithium), and gradually develop a ratio can anode materials such as silicon anode, and lithium metal anode even without the lithium cathode), etc. In addition, diaphragm, pole ear, fluid collector, packaging materials and other auxiliary materials in the core still account for a higher proportion, is expected to further reduce through the continuous development of technology iteration, in the development of anode and anode materials into the bottleneck period, the energy density of the cell in the auxiliary material optimization is still about 10% room for improvement. In terms of the cell structure design, the larger the cell size, the higher the polar one-sided capacity, the smaller the porosity, the smaller the N/P ratio, the higher the first cycle efficiency, the higher the energy density of the cell.
In terms of improving battery safety, the core idea is to gradually introduce safer solid electrolyte and reduce liquid content on the basis of traditional lithium-ion batteries. The idea of in-situ solid-state can effectively improve the solid-solid interface contact, volume change and other problems caused by the introduction of solid electrolyte, and reduce the internal contact resistance. Of course, the solid state battery needs to comprehensively consider the performance of many aspects, in the cell development process, but also to the material parameters, structural parameters, process parameters to obtain and modify, combined with simulation technology, accurate design of the cell energy density, capacity, volume, internal resistance, magnification and other performance indicators.
At present, Veilan New Energy has developed a series of high energy density and high safety hybrid solid-liquid battery products in the fields of UAV, electric vehicle and national security, etc., and its comprehensive electrical performance and safety rank at the forefront of the industry. Although the development and industrialization of solid state batteries with high energy density and high safety are still facing many challenges, Weilan New Energy is willing to work with peers to make solid progress, overcome difficulties and jointly boost the vigorous development of China's lithium battery industry!