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Prof. Changshin Jo from the GIFT and researcher Jeong Hye-bin from the Department of Chemical Engineering announced on the 20th that they have confirmed the superiority of seawater batteries with chelating agents added, and have successfully applied them to seawater batteries.

Lithium-ion batteries are widely used in portable electronic devices and car batteries, but have the disadvantages of a risk of explosion and of dependence on the availability of lithium, which is limited. To overcome these limitations, active research is being conducted on next-generation batteries, of which seawater batteries constitute one type. Seawater batteries use sodium ions in seawater to produce energy, so resources are easy to obtain. They are also environmentally benign because seawater can be used directly without additional processing.

Seawater is salty due to its high content of sodium ions. In seawater batteries, these ions can store and release electrical potential energy by moving between the anode and cathode. However, the cathodes have been composed of nickel hexacyanoferrate (NiHCF), which it tends to have many defects due to the difficulty of controlling the manufacturing process.

In this study, the research team synthesized NiHCF with chelating agents added (referred to as sample A) and compared it with NiHCF without them (sample B) to quantify the effects of chelating agents.

Sample A had lower moisture content than sample B. Generally, high moisture content leads to a decrease in electrochemical performance. Measurements of current and voltage confirmed that sample A had higher energy efficiency and a larger capacity than sample B.

Batteries that sample A or sample B were charged and discharged for 2,000 cycles. , which is the first in academia, The battery that used sample A showed approximately 92.8% higher capacity retention rate than the battery that used sample B. Moreover, the defect-generation rate, which was a drawback of NiHCF, was also reduced to 6% in sample A from XXX % in sample B.

The research team expects that because of the superiority of NiHCF with chelating agents added, and of seawater batteries that use this NiHCF, active research on next-generation batteries will be conducted in the future.

This research result, funded by the Korea Research Foundation and supported by the Korea Institute of Energy Technology Evaluation and Planning, was published in an international journal, the Chemical Engineering Journal.