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전사법으로 제조한 SOFC용 YSZ 전해질 전사지의 치밀화 및 전기화학적 특성
조해란 ( Hae Ran Cho ),최병현 ( Byung Hyun Choi ),안용태 ( Yong Tae An ),백성현 ( Sung Hyeon Baeck ),노광철 ( Kwang Chul Roh ),박선민 ( Sun Min Park ) 대한금속재료학회(구 대한금속학회) 2012 대한금속·재료학회지 Vol.50 No.9
Decalcomania is a new method for SOFCs (solid oxide fuel cells) unit cell fabrication. A tight and dense 5 ㎛Yttria-stabilized zirconia (8YSZ) electrolyte layer on anode substrate was fabricated by the decalcomania method. After 8YSZ as the electrolyte starting material was calcined at 1200℃, the particle size was controlled by the attrition mill. The median particle size (D50) of each 8YSZ was 39.6 ㎛, 9.30 ㎛, 6.35 ㎛, and 3.16 ㎛, respectively. The anode substrate was coated with decalcomania papers which were made by using 8YSZ with different median particle sizes. In order to investigate the effect of median particle sizes and sintering conditions on the electrolyte density, each sample was sintered for 2, 5 and 10 h, respectively. 8YSZ with a median particle size of 3.16 ㎛which was sintered at 1400℃ for 10 had the highest density. With this 8YSZ, a SOFCs unit cell was manufactured with a 5 ㎛layer by the decalcomania method. Then the unit cell was run at 800℃. The Open Circuit Voltage (OCV) and Maximum power density (MPD) was 1.12 V and 650 mW/cm2, respectively.
Chemical Manganese Dioxide (CMD) 합성에서의 Seed의 열처리 효과 및 그 CMD로부터 제조되는 LiMn2O4의 전지특성
김성욱 ( Sung Wook Kim ),조해란 ( Hae Ran Cho ),노광철 ( Gwang Chul Roh ),박선민 ( Sun Min Park ) 한국화학공학회 2013 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.51 No.4
본 연구에서는 LiMn2O4 제조에서 Mn 원료로 사용되는 CMD를 seed 첨가법을 사용하여 제조하고자 하였으며, Seed의 열처리 온도가 CMD 합성에 미치는 영향을 고찰하고, 그로부터 제조되는 LiMn2O4의 전기화학적 특성을 평가하고자 하였다. 제조한 시료의 물성평가는 X-선 회절 분석법(XRD), 주사전자현미경(SEM)을 통하여 실시하였다. 그 결과, MnCO3를 300℃ 이상의 온도에서 열처리하여 seed로 사용할 경우 γ-MnO2 상의 CMD가 얻어졌으며, 그 CMD를 LMO 제조에 사용할 경우 전기화학적 특성이 비교적 우수한 LMO가 얻어졌다. A series of Mn compound were prepared by seed-assisted method. The seed used in this reaction was manufactured by calcination of MnCO3 at various temperatures and effects of the calcination temperature on seed-assisted reaction were investigated. With increase of the calcination temperature, CMD (γ-MnO2) was recovered after seedassisted reactions. LMO used as cathode active material in the Li-ion batteries were synthesized from Mn source obtained in the seed-assisted reaction and the electrochemical properties (rate capability, cycle life performance and specific capacity) of the LMO were investigated. The LMO synthesized from the CMD which is obtained by the reaction with seed prepared by calcination of MnCO3 more than 350℃ shown good electrochemical properties.