KIST’s Lithium Metal Ion Battery Installed Drone Flown with Twice the Efficiency (September 25)
- KIST develops lithium metal ion battery twice more efficient than lithium ion battery
- Published in ‘Nature Energy’ in recognition of innovative research
- Expected to be applied in unmanned vehicles, such as drones, autonomous cars and unmanned submarines
□ The Ministry of Science and ICT (MSIT) stated that Dr. Won Il Cho and his team from the Korea Institute of Science and Technology (KIST) Energy Storage Research Division developed a lithium metal ion battery with more than double the energy density of lithium ion batteries currently used in smart phones or laptops, and maintains at least 80% of initial performance after charging and discharging 1,200 times or more.
ㅇ The team covered the surface of lithium metal with artificial protective film to enhance battery performance and safety. The study was published on the September 25th online issue of the international journal ‘Nature Energy, IF(46.859).’
※ Thesis : Langmuir-Blodgett artificial solid-electrolyte interphases for practical lithium metal batteries
□ The lithium metal ion battery replaces the graphite cathode of the lithium ion battery with lithium metal, and in theory has 10 times larger energy capacity than the lithium ion battery to be considered the next-generation battery system. However, due to the high reactivity of lithium metal, dendrite* is formed on the metal surface, which can trigger battery explosion or reduce battery life.
* A twig-shaped crystal that grows abnormally on metal surface. Expands electrode volume and triggers abnormal response between electrode and electrolyte.
□ The team evenly sprayed graphene nanomaterials on lithium metal surface to prevent dendrite, and used the artificial protective layer ‘Langmuir-Blodgett artificial solid-electrolyte interphase’ and applied quantum mechanics* calculation to develop the ultimate electrolyte mix.
* Technology for interpreting electron movements based on quantum mechanics to calculate electron structure and molecular reactivity by computer without actual battery production or long-term assessment
ㅇ The team confirmed that by using artificial protective film and electrolyte mix, 80% of initial performance was maintained even after charging and discharging more than 1,200 times. Also, the battery can be charged and discharged more than 200 times even if the amount of lithium metal was reduced to that of commercialized lithium ion battery.
□ The research enables the production of high-capacity, long-life battery without the energy storage limitations found in lithium ion battery and is expected to be a valuable opportunity for the lithium metal ion battery, lithium sulfur battery and lithium air battery industries.
ㅇ Research leader Won Il Cho pointed out that the research helped “develop a source technology for significantly enhancing battery performance and safety” and indicated the possibility of the technology “spreading to other industries, such as drones, autonomous cars, unmanned submarines and other unmanned vehicles.”
□ The study was conducted with the support of MSIT’s 「Project for developing core technologies that will lead the future of unmanned vehicles」 and KIST’s 「Future source technology research」.