S-Space College of Engineering/Engineering Practice School (공과대학/대학원) Dept. of Chemical and Biological Engineering (화학생물공학부) Journal Papers (저널논문_화학생물공학부)
Lattice Water for the Enhanced Performance of Amorphous Iron Phosphate in Sodium-Ion Batteries
- Lim, Soo Yeon; Lee, Ji Hoon; Kim, Sangryun; Shin, Jaeho; Choi, Wonchang; Chung, Kyung Yoon; Jung, Dae Soo; Choi, Jang Wook
- Issue Date
- Acs Energy Letters, Vol.2 No.5, pp.998-1004
- We report amorphous iron phosphate with lattice water, namely FePO4. xH(2)O (x similar to 2.39), as a promising sodium-ion battery (SIB) cathode. After carbon coating, micrometer-sized FePO4.xH(2)O exhibits a reversible capacity that is higher than that of its counterpart without lattice water (130.0 vs 50.6 mAhg(-1) at 0.15C rate) along with clearly enhanced rate capability and cyclability. The superior electro-chemical performance of FePO(4.)xH(2)O is attributed to the lattice water that facilitates sodium-ion diffusion via enlarged channel dimensions and the screening of the electrostatic interactions between sodium ions and host anions. The amorphous phase is also advantageous in accommodating the stress created in the host framework during sodium-ion (de)intercalation. The presence of lattice water also protects the oxidation state of Fe from reductive surface carbon coating and slightly lowers the operation voltage via reduced inductive effect. The current study provides a useful insight into how to design SIB electrode materials particularly focusing on facile sodium-ion diffusion.
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