전기화학회지 (Journal of the Korean Electrochemical Society)

  • 제22권4호
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  • Pages.148-154
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  • 2019
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  • 1229-1935(pISSN)
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  • 2288-9000(eISSN)
한국전기화학회 (The Korean Electrochemical Society)
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리튬이온 이차전지용 고용량 KVO3 음극의 전기화학적 성능개선

Improvement of Electrochemical Performance of KVO3 as High Capacity Negative Electrode Material for Lithium-ion Batteries

  • 김태훈 (한국산업기술대학교생명화학공학과) ;
  • 김경래 (한국산업기술대학교생명화학공학과) ;
  • 박환동 (한국산업기술대학교생명화학공학과) ;
  • 김해빈 (한국산업기술대학교지식기반기술.에너지대학원) ;
  • 류지헌 (한국산업기술대학교지식기반기술.에너지대학원)
  • Kim, Tae Hun (Department of Chemical Engineering and Biotechnology, Korea Polytechnic University) ;
  • Gim, Gyeong Rae (Department of Chemical Engineering and Biotechnology, Korea Polytechnic University) ;
  • Park, Hwandong (Department of Chemical Engineering and Biotechnology, Korea Polytechnic University) ;
  • Kim, Haebeen (Graduate School of Knowledge-Based Technology and Energy, Korea Polytechnic University) ;
  • Ryu, Ji Heon (Graduate School of Knowledge-Based Technology and Energy, Korea Polytechnic University)
  • 투고 : 2019.10.04
  • 심사 : 2019.11.13
  • 발행 : 2019.11.30
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초록

바나듐 산화물계 물질은 고용량의 구현이 가능하여 리튬이온 이차전지용 음극재료로 많은 연구가 진행되어 왔다. 본 연구에서는 새로운 음극물질로써 포타슘 메타바나데이트($KVO_3$)를 합성하였으며, 이를 음극 활물질로서의 전기화학적 특성에 대하여 평가하였다. $NH_4VO_3$와 KOH 수용액을 당량에 맞추어 혼합한 후에 이를 가열하여 암모니아를 제거하고 건조함으로써 $KVO_3$ 분말을 손쉽게 합성할 수 있었다. 이렇게 얻어진 $KVO_3$를 300 내지 $500^{\circ}C$에서 8시간 동안 열처리하였다. 열처리 온도가 증가할 수록 초기용량은 감소하였으나, 수명과 효율은 일부 개선되는 경향을 나타내었으나 큰 차이가 나타나지 않았다. 반면에 $KVO_3$를 사용한 전지의 제조 시에 PVdF (polyvinylidene fluoride) 대신에 PAA (polyacrylic acid) 바인더를 사용한 경우 및 전해액 첨가제인 FEC (fluoroethylene carbonate) 를 적용하는 경우에 전기화학적 성능이 크게 개선되었다. 이 전지의 초기 가역용량과 쿨롱효율이 각각 1169 mAh/g과 76.3%로 개선되어 리튬이온 이차전지용 새로운 음극재료로 가능성을 기대할 수 있을 것이다.

Vanadium oxide based materials have been studied as novel negative electrode materials in lithium-ion batteries (LIBs) because of their high specific capacity. In this study, potassium metavanadate ($KVO_3$) was synthesized and its electrochemical properties are evaluated as a negative electrode materials. The aqueous solution of $NH_4VO_3$ is mixed with a stoichiometric amount of KOH. The solution is boiled to remove $NH_3$ gas and dried to obtain a precipitate. The obtained $KVO_3$ powders are heat-treated at 300 and $500^{\circ}C$ for 8 h in air. As the heat treatment temperature increases, the initial reversible capacity decreases, but the cycle performance and Coulombic efficiency are improved slightly. On the contrary, the electrochemical performances of the $KVO_3$ electrodes are greatly improved when a polyacrylic acid (PAA) as binder was used instead of polyvinylidene fluoride (PVDF) and a fluoroethylene carbonate (FEC) was used as electrolyte additive. The initial reversible capacity of the $KVO_3$ is 1169 mAh/g and the Coulombic efficiency is improved to 76.3% with moderate cycle performance. The $KVO_3$ has the potential as a novel high-capacity negative electrode materials.

키워드

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