화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of the Korean Industrial and Engineering Chemistry, Vol.13, No.8, 782-786, December, 2002
Export Citation
Hydroquinone유도체의 전기화학적 특성과 리튬이차전지 양극활물질로의 응용
Electrochemical Proeprties of Hydroquinone Derivatives and Their Application to Positive Active Materials in Li-Secondary Battery
서정인, 최하영, 안정호, 김진환, 배진영†
  • 성균관대학교 응용화학부, 고분자기술연구소, 경기 440-746
Jeong In Seo, Ha Young Choi, Jeongho Ahn, Jin Hwan Kim, and Jin Young Bae†
  • College of Applied Chmistry, Polymer Technology Institute, Sungkyungkwan University, Kyunggi-do 440-746, Korea
E-mail:
초록
전기화학적 안정성과 높은 이론용량을 나타내는 유기화합물인 hydroquinone과 전자쌍 주게 작용기(electron-donating group)를 가지는 methyl hydroquinone 및 tert-butyl hydroquinone을 LiOH와 반응시켜 hydroquinone 및 그 유도체의 활성화수소를 Li으로 치환한 후 도전성 물질인 acetylene black, 바인더인 poly(vinylidene fluoride)(PVdF)와 혼합하여 리튬이차전지용 양극을 제조하였다. Hydroquinone에 전자쌍 주게 관능기를 도입함에 따른 전기화학적 특성의 변화를 조사하기 위해서 용액상에서 순환 전위-전류법(cyclic voltammetry)을 이용하여 산화·환원 특성을 측정하였고, 양극/PP(polypropylene)·PE(polyethylene)·PP(polypropylene) 세퍼레이터/리튬금속 전지를 제조한 후, 전기화학적 특성은 순환 전위-전류법을 이용하여, 충·방전 특성은 충·방전 cycler를 이용하여 측정하였다. 실험 결과 방전전위는 hydroquinone/Li이 2.7 V였고, 전자쌍을 주게 작용기를 가지는 methyl hydroquinone/Li 및 tert-butyl hydroquinone/Li의 경우 hydroquinone/Li에 비해 낮은 2.3 V의 전위를 나타냈다. 이는 전자쌍 주게 작용기를 가지고 있는 경우 전자를 보다 쉽게 방출할 수 있어 hydroquinone에 비해 낮은 산화·환원 전위를 나타냄을 알 수 있었다. 충·방전 특성은 hydroquinone/Li의 경우 101 Ah/kg의 용량을 나타냈다.
The positive active material for lithium secondary batteries was prepared by using organic compounds: hydroquinone and its derivatvies(methyl hydroquinone and tert-butyl hydroquinone) with high electrochemical stability and high theoretical capacity. These compounds were reacted with LiOH to give hydroquinone/Li salts, which were then blended with acetylene black and poly(vinylidene fluoride) to prepare for the cathode materials. Electrochemical properties of hydroquinone derivatives in solution state were measured by cyclic voltammetry; electrochemical and charge/discharge performance of hydroquinone-Li or hydroquinone derivatives-Li cathode/PP(polypropylene)·PE(polyethylene)·PP(polypropylene) separator/Li metal cell were measured by cyclic voltammetry and charge/discharge cycler. Discharge voltage of hydroquinone was 2.7 V and hydroquinone derivaties with electron-donating group showed 2.3 V. Oxidation/reduction voltage of hydroquinone derivatives with electron donating group was lower than hydroquinone because of the inductive effect by the electron donating groups. Hydroquinone-Li/separator/Li cell exhibited the capacity of 101 Ah/kg at room temperature.
Keywords:Li secondary battery;hydroquinone;hydroquinone derivatives;positive active material
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