NINGBO, Aug. 19 (Xinhua Finance) -- The 5th National Solid State Battery Symposium 2019 was held in Ningbo, Zhejiang Province from Aug. 17 to 18. Experts at the symposium believe that going solid state is a natural choice for high specific energy and high safety power batteries, and vigorously developing solid state batteries will help China's lithium battery industry to run from parallel to leading, and realize the surpassing of Japan, South Korea and other traditional powerhouses of lithium batteries.
With the rapid development of new energy vehicles, the demand of new energy vehicles for power batteries is mainly focused on two aspects: long range and high safety. Academician of the Chinese Academy of Sciences, Tsinghua University School of Materials Professor Nan Zewen introduced at the meeting, the current energy density of liquid ternary lithium battery products can reach 240 watt hours per kilogram to 260 watt hours per kilogram, is close to about 300 watt hours per kilogram process limit, it is difficult to continue to improve. In terms of safety, Nan Zewen said that due to the use of low flash point electrolyte, safety hazards are inherent to liquid batteries.
In fact, there have been a number of electric vehicle fire accidents at home and abroad since this year, causing a certain negative impact on the development of the industry. According to Wuhan University professor Ai Xinping's statistics on more than 40 electric vehicle fire accidents in 2018, spontaneous combustion during charging accounted for 29%, spontaneous combustion during resting and driving accounted for 39%, while spontaneous combustion caused by wading, collision and extrusion accounted for less than 20%. "The main reason for power battery fire and combustion lies in the power battery itself, rather than external factors", said Ai Xinping, due to the application process of short circuit and overcharge can not be completely avoided, the battery in the use of the process must be a safety hazard.
And along with the increase in battery energy density, safety issues are becoming more and more prominent.
How to solve the contradictory problem of high energy density and high safety, experts at the meeting generally agreed that solid-state battery technology may be able to provide the "best of both worlds" answer.
Ltd. said, solid-state batteries by reducing the chemical system of the battery's flammability, the use of solid-state diaphragm thermal stability advantages to reduce the internal short circuit and external damage to the degree of thermal runaway battery, in theory, there are safety advantages; In addition, solid-state batteries in the positive and negative electrode material selection on a wider range, can further improve the energy density of the battery.
At present, solid-state battery technology research and development has attracted widespread attention around the world. Toyota, BMW, Volkswagen, Samsung and other giant companies have invested a lot of money in solid-state battery research, Toyota is planning to launch its pure electric demonstration car with solid-state batteries at the 2020 Tokyo Olympics. Domestically, Zhejiang Fenglithium, Qingtao, and Weilan New Energy represent the start-ups exploring the industrialization of solid-state batteries, and the related trial products have high energy density and excellent safety performance. In addition, many domestic research institutions are also actively carrying out related basic and application research.
Nevertheless, there are still many problems in the development of solid-state batteries, including solid electrolyte materials, interface problems, etc., which need to be solved, and there is still a long way to go for mass production of solid-state batteries, especially all-solid-state batteries. Chen Lizhuan, an academician of the Chinese Academy of Engineering, believes that China's lithium-ion power battery market share beyond Japan and South Korea, becoming the world's first is only to achieve China's lithium battery industry from running to running, the future to further achieve from running to leading also need to vigorously develop solid-state batteries, for early breakthroughs. In the view of Nan Zewen, Qingtao, Zhejiang Fenglithium, Weilan New Energy and other enterprises have identified a clear industrial direction and evolutionary path, the prospects of China's solid-state battery industry can be expected.
After years of development, China has formed the most complete lithium battery industry chain in the world. Talking about the impact of solid-state battery development on the existing lithium battery industry chain, Li Hong, a researcher at the Institute of Physics of the Chinese Academy of Sciences, said that the development of solid-state batteries will not overturn the existing industrial pattern, but it is possible to generate new leading enterprises in the segmentation field.
The 2019 Fifth National Solid State Battery Symposium was co-organized by the Solid State Ionics Branch of the Chinese Silicate Society and Ningbo Municipal People's Government, and hosted by Ningbo National High-tech Zone (New Materials Science and Technology City) Management Committee and Zhejiang Fenglithium New Energy Technology Co. The conference will discuss issues of concern to the whole industry, including key materials, key technologies, key equipment and standards.
