Compared with silver-zinc batteries, lithium-ion batteries show significant advantages in terms of energy density and safety. The energy density of commercial monomers is currently up to 180Wh/kg. However, in the case of lithium ion batteries using organic electrolytes, when an abnormality such as overcharging or internal short circuit occurs, the volatile and flammable organic electrolyte may cause thermal runaway. This problem is more prominent below 3000 meters sea depth, and explosion occurs. The probability of a security incident increases. The use of solid electrolyte instead of liquid electrolyte can make the energy density of the battery reach 400Wh/kg, which is more than twice that of commercial lithium-ion batteries and more than 6 times that of silver-zinc batteries. At the same time, it can effectively overcome the safety risks such as thermal runaway and meet deep diving. The long-life and high-security requirements provide sufficient energy for deep-sea space stations and deep-sea robots.
Supported by the Deepwater Power Project of the Nano-Special and Science and Technology Promotion and Development Bureau of the Chinese Academy of Sciences, the R&D team headed by Cui Guanglei, winner of the National Outstanding Youth Fund of the Qingdao Institute of Bioenergy and Processes of the Chinese Academy of Sciences, insists on innovation at the source, targeting traditional polyethylene oxide (PEO). The bottleneck problem of low room temperature ionic conductivity and narrow potential window. From the structure-activity relationship between electrolyte molecular structure and ionic conductivity, the multi-scale scientific problem of ion transport mechanism and pressure coupling is deeply studied, and the comprehensive performance is excellent. The "rigid and flexible" composite polymer solid electrolyte; at the same time systematic analysis of solid-state lithium battery thermo-electric-stress multi-physics coupling factors, the development of solid-state battery cross-scale correlation theory; on the basis of source innovation, innovative development of metal Lithium interface modification technology and interface in-situ remediation technology; under the strong support of the Institute of Deep Sea Science and Engineering of the Chinese Academy of Sciences, “Land†and “Sea†have combined to overcome key engineering and technical issues such as deep-sea lithium battery modules and system integration. Developed a deep sea, high energy density, high security solid state lithium battery power system System.
The system has the characteristics of high safety, long battery life and full sea depth, and is an ideal power for long-life deep submersibles. The first generation of high-capacity solid polymer lithium secondary battery (Qingeng-I) developed by the team uses ternary materials and metallic lithium as the positive and negative electrodes. The third-party authoritative test has an energy density of more than 250Wh/kg and 500 cycles. Maintaining more than 80%, it maintains very good safety performance under severe test conditions such as multiple needle punches and extrusions. Up to now, the technology of solid-state lithium secondary battery (Qingeng-II) developed by Cui Guanglei team of Qingdao Energy Institute has achieved breakthroughs, the energy density has reached 300Wh/kg, which is twice that of commercial lithium-ion battery, and 5 of silver-zinc battery. Times.
From January 15th to March 23rd, the solid-state battery system developed by Qingdao Energy Research Institute (Qingeng-I) went to the Mariana Trench (TSOK voyage TS03) with the Deep Sea Science Research Team of the Chinese Academy of Sciences. No. Lander control system and CCD sensor provide energy, and accumulated 9 times of dive, the depth is more than 7000 meters, of which 6 times exceed 10000 meters, the maximum working water depth is 10901 meters, the accumulated underwater working time is 134 hours, and the maximum continuous operation time is up to 20 hours, successfully completed the 10,000-meter deep-sea demonstration application, which marked that China became the second country in the world to successfully apply the full-sea deep lithium secondary battery power system after Japan, marking the breakthrough of the Chinese Academy of Sciences' "land-sea fusion" The deep power technology bottleneck, master the core technology of the deep sea power system.
The above results have been supported by projects such as “National Jieqingâ€, “National Academy of Sciences Nano Special Projectâ€, “135â€, “Chinese Academy of Sciences Deep Sea Power Special†and “Qingdao Energy Storage Fundâ€.
Qingdao Energy Institute's all-sea deep solid lithium battery completes the demonstration application of the Wanmi sea trial
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