S-Space College of Engineering/Engineering Practice School (공과대학/대학원) Dept. of Chemical and Biological Engineering (화학생물공학부) Journal Papers (저널논문_화학생물공학부)
Critical Role of Crystal Water for a Layered Cathode Material in Sodium Ion Batteries
- Nam, Kwan Woo; Kim, Sangryun; Yang, Eunjeong; Jung, Yousung; Levi, Elena; Aurbach, Doron; Choi, Jang Wook
- Issue Date
- Chemistry of Materials, Vol.27 No.10, pp.3721-3725
- Layered transition metal oxides are considered promising cathodes for sodium ion batteries (SIBs) due to their superior specific capacities. However, they usually suffer from insufficient cycling and rate performance mainly from the structural instability during repeated cycles. We overcome these longstanding challenges by engaging crystal water in the interlayer space of sodium manganese oxide under the Birnessite framework. The crystal water enhances Na ion diffusion both in the crystal host and at the interface, suppresses fatal Mn2+ dissolution, and improves long-term structural stability, leading to excellent performance in rate capability and cycle life. The current study suggests that many hydrated materials can be good candidates for electrode materials of emerging rechargeable batteries that need to deal with the large size or multivalent charge of their carrier ions.
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