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리튬이차전지용 Li-Mn-O 계 양극활물질의 충방전 특성에 관한 연구
강탁,이선엽 대한금속재료학회(대한금속학회) 1995 대한금속·재료학회지 Vol.33 No.1
The characteristics of Li-Mn-O ternary compound was studied as a cathode active material for lithium secondary batteries. Li-Mn-O cathode active materials were prepared by the reaction of γ-MnO₂(EMD) and LiOH·H₂O at 375℃ with various molar ratios. As the contents of lithium increased, the cyclic reversihility was improved. Compound with Li/Mn=3/7 molar ratio showed the best results, considering reversibility and discharge capacity at the same time. The effects of the types of MnO₂ on the cyclic behaviour were also studied. It was shown that the channel structure of MnO₂ played important roles on the cyclic behaviour of Li-Mn-O cathode. Themodynamically, the larger the channel size, the greater the discharge capacity. The α-phase, however, which has the largest [2×2] channels showed lower lithium ion diffusivity than the γ phase having [1×2]+[1×1] channels. It was thought that this behaviour was attributed to the impurities inserted in the process of synthesis of α-MnO₂, So, as the discharge rate increased, γ-phase showed better result than α phase.
강탁,박평주,허인석 대한금속재료학회(대한금속학회) 1977 대한금속·재료학회지 Vol.16 No.3
Sn(l)|Sn^(2+)(KCl-LiCl)|Sn-Sb(l) 형의 galvanic cell의 起電力을 671∼906K 온도 범위에서 測定하여 錫-안티몬 熔融合金中의 錫의 activity를 구하였다. 이 測定結果와 旣存의 生成熱 data를 組合하여 이 合金生成時의 entropy 變化를 계산할 수 있었다. activity나 entropy 曲線의 形態에서 固相에서 β相의 熔融金屬의 熱力學的 性質에 어떤 영향을 미친다고 추측할 수 있었다. The activities of tin in liquid tin-antimony alloys were determined in the temperature range of 671 to 906K by means of the galvanic cell: Sn(l)|Sn^(2+)(KCl-LiCl)|Sn-Sb alloy(l). The entropies of formation of this alloy system were calculated from these results and the values of heat of formation measured by calorimetric methods. From the curvatures of the plot of activities and entropies versus the concentration of the alloys, it is suggested that the solid β phase has an influence on the thermodynamic properties of Sn-Sb molten alloys.
연구논문초록(’81-’90) : 교류 임피던스와 정전류 스텝법에 의한 황산염 용액에서의 코발트 석출기구
강탁,백민선 한국부식학회 1991 Corrosion Science and Technology Vol.20 No.1
The reaction mechanism of cobalt electrodeposition is studied using A.C. impedance technique and current step method. The results of A.C. impedance agree to the proposed mechanism in the solution of low pH for all overpotentials and in that of high pH for low overpotential. Differential capacity of the electrode shoves that it contiains not only the capacity of electrical double layer but also that of adsorption. Potential responses of current steps coinside to chronopotentiometric curves calculated in numerical analysis. Thus all the results of this work confirm the proposed reaction mechanism.
자기기록헤드 제조를 위한 퍼말로이 박막의 도금에 관한 3차원 전류밀도 분포 수치모사
강탁,전상현,최녕식 대한금속재료학회(대한금속학회) 1997 대한금속·재료학회지 Vol.35 No.7
The current distribution around rectangular cathode used in permalloy plating for the production of magnetic recording head was predicted by use of boundary element method. Three dimensional grid generator was made for the calculation of complex domain. It can be also used for curved surface. Experimental data were compared with those calculated values and fairy good agreement was observed. The effect of cell geometry and auxiliary electrode on current distribution was simulated. For the plating on the circular wafer, modification of the shape of auxiliary electrode was proposed for maximization of cathode area when active area density of cathode is smaller than that of auxiliary electrode.