|학술대회||2018년 가을 (11/07 ~ 11/09, 여수 디오션리조트)|
|발표분야||C. 에너지 재료 분과|
|제목||The chemical stability of NASICON in seawater for a stable solid electrolyte|
|초록|| Sodium ion batteries (SIBs) have been intensively studied as an alternative to lithium ion batteries due to the low cost of sodium and similar redox potential (E0 = -2.71V vs. SHE). There is a suitable SIB system for grid-scale ESS that uses seawater as a cathode. This system can generate energy using sodium ion in seawater. Sodium ions in seawater can selectively move through a solid electrolyte to anode to store energy. The NASICON (Na3Zr2Si2PO12) as a solid electrolyte for this system separates the seawater from the anode to prevent short circuit and the safety problem. However, NASICON is known to have unstable properties in water because of minor phase dissolution and hydronium ion exchange reaction. These reactions can destroy the NASICON structure and disable the functions.
For this reason, we have demostrated the stability of NASICON in seawater with comparison to different degradation mechanism between in DI-water and seawater through immersion experiments. The NASICON in seawater exhibits higher chemical and physical stability than in DI-water. In addition, its electrochemical property maintains well even after long-term immersion in seawater while the NASICON in DI-water loses the property. This experiment reveals the stability of seawater battery operation under the sea using NASICON as a solid electrolyte.
|저자||Tae-Ung Wi1, Chanhee Lee2, Fahmi Rahman3, Wooseok Go1, Youngsik Kim2, Hyun-Wook Lee3|
|소속||1School of Energy and Chemical Engineering, 2Ulsan National Institute of Science and Technology (UNIST), 3Korea|
|키워드||<P>Energy; Sodium ion battery; SIB; Seawater battery; NASICON; Solid electrolyte; Stability</P>|