2 Seawater to Resource Technology SRT explanation Seawater to Resource Technology (SRT) Seawater is the most abundant chemical on the earth, and it is composed of about 96.5% water and 3.5% salt, so it has infinite resources. ‘Seawater To Resource technology’ is that extracts these resources in a form suitable for use when seawater battery operation. It is an integrated system that uses seawater as an energy conversion medium like the natural circulation. Obtainable resources through SRT system include energy storage, fresh water, hydrogen, caustic soda, chlorine, and lithium extraction. SRT core technology Cl2, H2, NaOH Production Cl2 is generated during charging of seawater batteries and H2 and NaOH are generated during discharging, and these are industrially useful resources. It can be produced in a lower energy and eco-friendly manner than the existing resource production technology. In addition, since seawater can be used, resources can be obtained from concentrated wastewater(RO brine) generated in the desalination process. Cl2: Chemical industry, water treatment (Disinfection), etc. H2: Eco-friendly energy source, semiconductor, fine chemical, etc. NaOH: Chemical industry, Na ion battery material, baking soda, etc. Where to go: Chlor-Alkali industry, seawater electrolysis, concentrated wastewater treatment industry (enterprise) Desalination We are developing a desalination battery system that lowers salinity by moving Na+ ions in seawater to the anode of the seawater battery and Cl- ions to the electrode through a cation exchange membrane. Compared to conventional desalination batteries (<78wWh/kg, <1.25V, <190mg/g), it has advantages in energy density(4041Wh/kg), discharge voltage(3.46V), and the amount of seawater (1000mg/g) that can be treated per unit volume. Li Harvestring As the demand and market for lithium-ion batteries have increased significantly, the usage of lithium and cobalt as battery raw materials and their price are increasing significantly. Due to the limited reserves of raw materials, the requirement for lithium recycling is emerging in society. Lithium extraction technology is a system that extracts usable resources (Li2CO3, LiOH) from waste lithium resources through an electrochemical process. For this purpose, system design, extraction electrode development, and ceramic solid electrolyte research are in progress.