S-Space College of Engineering/Engineering Practice School (공과대학/대학원) Dept. of Chemical and Biological Engineering (화학생물공학부) Journal Papers (저널논문_화학생물공학부)
Superlattice formation of crystal water in layered double hydroxides for long-term and fast operation of aqueous rechargeable batteries
- Lee, Ji Hoon; Lee, Hyeon Jeong; Choi, Sun Hee; Shin, Jaeho; Chung, Sung-Yoon; Choi, Jang Wook
- Issue Date
- Advanced Energy Materials, Vol.8 No.18, p. 1703572
- aqueous rechargeable batteries; crystal water; layered double hydroxides; solid-solution mixing; superlattices
- Aqueous rechargeable batteries (ARBs) are gaining increasing attention as alternatives to conventional nonaqueous lithium ion batteries. However, finding electrode materials with competitive electrochemical properties in various aspects is challenging. Moreover, the operation mechanism of some of high performance electrode materials is not fully understood. Here, an alpha-phase layered double hydroxide (alpha-LDH) working in alkaline electrolytes as an ARB cathode is reported. On charge, OH- carrier ions intercalate into the interlayer space and react with protons detached from the host structure to yield crystal water. This crystal water is then arranged in a superlattice during charging to accommodate carrier ions and stabilize the structure. The solid solution mixing of cobalt and nickel also stabilizes the structure during the wide range of redox swing of Ni from 2+ to 4+. In pairing with Fe3O4/Fe(OH)(2) mixture, the alpha-LDH exhibits 198.0 mA h g(-1) at 3 A g(-1), 68.3% capacity retention after 10 000 cycles, and 172.5 mA h g(-1) at 1 min charge, demonstrating the promise of hydrated compounds for ARB electrodes. The present study elucidates that the arrangement of crystal water within the host framework plays a critical role in determining the electrochemical performance of the corresponding hydrated active compound in aqueous media.
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