The all-solid (sulfide) battery is a cutting-edge technology that promotes social and human progress, and has been included in the research ranks of Japan's scientific community that can go hand in hand with 5G and artificial intelligence. With its advantages of high safety, high energy density, high temperature resistance, long life, etc., it has creatively solved a series of problems such as short life, flammability, and explosion that exist in traditional organic electrolyte batteries, and has become a benefit to mankind. Disruptive breakthrough technology. In the market demand for new energy vehicles that urgently need to improve cruising range, many car companies have invested in the battlefield of all-solid-state battery research and development. Toyota of Japan is a leading company in the development of all-solid-state (sulfide) batteries, and has completed battery samples at the pilot stage. Samsung, BMW, Volkswagen and other companies have also expressed positive attitudes in the layout of solid-state batteries. At present, all-solid-state batteries are in the technical stage of research and development to pilot test worldwide.
The germanium (Ge) sulfide solid electrolyte (invented by Professor Kanno of Tokyo Institute of Technology in Japan in 2011) due to its unique three-dimensional network crystal structure, lithium ions can be conducted one-dimensionally along the C axis, thereby obtaining up to 10-2 S The ionic conductivity of cm-1 can already match or even exceed the ionic conductivity of liquid electrolytes. The Advanced Energy Storage Materials and Technology Research Group led by Wu Jianfei, a researcher at the Qingdao Institute of Bioenergy and Processes, Chinese Academy of Sciences, has long been devoted to the research of sulfide solid electrolytes and all-solid-state batteries. Recently, we have successfully developed multi-system sulfide solid electrolytes and high-performance solid-state batteries. The ionic conductivity of solid electrolytes has reached 10-2 ~ 10-4 S cm-1; germanium-based and halogen-based solid electrolytes have achieved pilot batches Production; solid-state batteries at normal temperature 1000 cycles 0.5C capacity to maintain 70.05%, 5C charging capacity retention rate reached 79.28%, with excellent cycle and rate performance. The research team conducted a detailed study on the interface between the electrode and the solid electrolyte, providing a theoretical basis and technical guidance for the scale-up production of solid-state batteries. In the next step, the research team plans to gradually realize large-scale preparation of soft-pack batteries.
In 2019, the research team signed a cooperation intention with Weichai Power Co., Ltd. to jointly promote the industrial development of sulfide solid batteries in new energy vehicles, and was approved for major international cooperation projects in Shandong Province in 2019. Technical cooperation with Japan will be further Promote the development and commercial application of key basic technologies for all-solid-state batteries.
The above research was supported by two fusion projects.
Figure 1 Multifunctional solid electrolytes meet the challenges posed by the complexity of high-energy metal-based batteries
Figure 2 Related results of the research team in sulfide solid electrolyte and all-solid battery
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