Stabilized Octahedral Frameworks in Layered Double Hydroxides by Solid-Solution Mixing of Transition Metals

Ji Hoon Lee, Hyeon Jeong Lee, Soo Yeon Lim, Keun Hwa Chae, Sung Hyeon Park, Kyung Yoon Chung, Erhan Deniz, Jang Wook Choi

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70 Scopus citations

Abstract

Pseudocapacitors have received considerable attention, as they possess advantages of both rechargeable batteries and electric double layer capacitors. Among various active materials for pseudocapacitors, α-layered double hydroxides (α-TM(OH)2, TM = transition metal) are promising due to their high specific capacities. Yet, irreversible α-to-β phase transitions of α-TM(OH)2 hinder their long-term cyclability, particularly when the TM is nickel. Here, it is reported that binary TM ion mixing can overcome the limited cycle lives of α-TM(OH)2 by stabilizing the octahedral frameworks of α-TM(OH)2. In particular, an α-TM(OH)2 with equal amounts of nickel and cobalt exhibits long-term capacity retention (89.0% after 2000 cycles) and specific capacity (206 mA h g−1), which are better than those of individual TM counterparts. A series of analyses reveals that the improved performances originate from the synergistic effects between the TM ions; the preferred trivalent state of cobalt ions stabilizes the octahedral framework by accommodating the detrimental Jahn–Teller distortion of Ni3+. The stabilized framework also widens the redox swing range of the nickel up to 4+, thus, increasing the specific capacity of the corresponding α-TM(OH)2. This study indicates that proper mixing of TMs is a prolific approach in enhancing the vital properties of α-TM(OH)2, a promising family of pseudocapacitor materials.

Original languageEnglish
Article number1605225
JournalAdvanced Functional Materials
Volume27
Issue number7
DOIs
StatePublished - 17 Feb 2017

Keywords

  • Jahn–Teller effects
  • crystal field theory
  • layered double hydroxides
  • octahedral coordination
  • solid-solution mixing

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