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최전(Jeon Choi),이경구(Kyung Ku Lee) 한국수소및신에너지학회 1999 한국수소 및 신에너지학회논문집 Vol.10 No.2
Recently the Ni/MH secondary battery has been studied extensively to achieve higher energy density, longer cycle life and faster charging-discharging rate etc. In this work, the electrode properties of (LM)Ni<sub>4.49</sub>Co<sub>0.1</sub>Mn<sub>0.205</sub>Al<sub>0.205</sub> alloy and Ti<sub>0.6</sub>Zr<sub>0.4</sub>V<sub>0.6</sub>Ni<sub>1.4</sub> alloy with addition of Pd were investigated. These alloys did not show any change in XRD pattern by Pd addition. As Pd was added as alloy element, the activation behavior was not affected significantly in both AB₂ type and AB_5 type electrodes and, On charging and discharging in high current density, Discharge capacity with increasing of Pd content was more decreased. But cycle life was showed increasing. Especially the electrode of Ti<sub>0.6</sub>Zr<sub>0.4</sub>V<sub>0.6</sub>Ni<sub>1.4</sub> + 0.5wt% Pd alloy was not almost decreased discharge capacity for 400cycles.
금속 수소화물 전극제조에 있어서 알카리 무전해 구리 도금법의 응용
최전(Jeon Choi),박충년(Choong Nyeon Park) 한국수소및신에너지학회 1992 한국수소 및 신에너지학회논문집 Vol.3 No.2
Electroless copper plating method using an alkaline bath have been employed in copper coating of the (LM)Ni4.5Co0.1Mn0.2A10.2 hydrogen storage alloy powders for electrode preparation. The plating were conducted without any pretreatment of alloy powders. For the preparation of the electrodes, about 0.12g of the copper coated alloy powder (copper to alloy ratio 1/3 by weight) was compacted with pressure of 6 tons/cm2 at room temperature. The disk-type compacts had a diameter of 10mm and thickness of about 0.24mm. The electrode characteristics were examined through SEM observations and electrochemical measurements in a half cell. The electrochemical measurement showed that the maximum discharge capacity of the electrodes prepared by using alkaline bath were 245mAh per gram of coated alloy (327mAh per gram of alloy) and appeared a considerable degradation with increasing number of cycles. The decrease of the discharge capacity after 100 cycles was about 30% It can be suggested that, with a slight of improvement, this electroless copper plating method could be applied to the preparation of the rare earth-nickel based alloy electrode.
Zr계 수소저장합금의 전극특성에 미치는 은 첨가의 영향
노학,정소이,최승준,최전,서찬열,박충년,Noh, Hak,Jeong, So-yi,Choi, Seung-jun,Choi, Jeon,Seo, Chan-yeol,Park, Choong-Nyeon 한국수소및신에너지학회 1997 한국수소 및 신에너지학회논문집 Vol.8 No.3
The effects of Ag addition to Zr-based hydrogen storage alloys ($Zr_{0.7}Ti_{0.3}V_{0.4}Ni_{1.2}Mn_{0.4}$, $Zr_{0.7}Ti_{0.3}V_{0.4}Ni_{1.2}Mn_{0.3}Cr_{0.1}$ and $Zr_{0.6}Ti_{0.4}V_{0.4}Ni_{1.2}Mn_{0.3}Fe_{0.1}$) on the electrode properties were examined. Ag-free and Ag-added Ze-based alloys were prepared by arc melting, crushed mechanically, and subjected to the electrochemical measurement. In $Zr_{0.7}Ti_{0.3}V_{0.4}Ni_{1.2}Mn_{0.4}$ alloy, 0.08 wt% Ag addition to the alloy improved the activation rate. Also Ag addition improved both activation property and discharge capacity in $Zr_{0.7}Ti_{0.3}V_{0.4}Ni_{1.2}Mn_{0.3}Cr_{0.1}$. For these Ag-added alloys, discharge capacities with the change of charge-discharge current density(10mA, 15mA and 30mA) are almost constant. Showing very high rate capability, discharge capacity of $Zr_{0.6}Ti_{0.4}V_{0.4}Ni_{1.2}Mn_{0.3}Fe_{0.1}$ alloy increased by Ag addition to the alloy. When the amount of Ag addition in $Zr_{0.7}Ti_{0.3}V_{0.4}Ni_{1.2}Mn_{0.4}$ alloy increased too much, the electrode properties became worse. Unveiling mechanism of effect of Ag addition is now progressing in our laboratory.
Ni-MH 2차 전지용 Zr 계 수소저장합금전극의 특성에 미치는 치환원소 (Co, Cr, Fe) 의 영향
최승준(Seung Jun Choi),정소이(So Yi Jung),서찬열(Chan Yeol Seo),최전(Jeon Choi),박충년(Choong Nyeon Park) 한국수소및신에너지학회 1999 한국수소 및 신에너지학회논문집 Vol.10 No.3
Effects of alloy modification with the Zr<sub>0.6</sub>Ti<sub>0.4</sub>V<sub>0.4</sub>Ni<sub>1.2</sub>Mn<sub>0.4</sub> alloy for an electrode use have been investigated. For the alloy composition, a part of Mn was substituted by Co, Cr and Fe. The experimental results showed that Co accelerated activation of alloy, and Fe and Cr improved the discharge capacity. These results agree with P-C-T curves of each alloy. But substituting Fe for Mn showed the decrease of the discharge capacity when discharged at high rate (60㎃, about 1C rate). Considering both the discharge capacity and the high rate discharge property, Zr<sub>0.6</sub>Ti<sub>0.4</sub>V<sub>0.4</sub>Ni<sub>1.2</sub>Mn<sub>0.3</sub>Cr<sub>0.1</sub> alloy was found to be the best alloy among the alloys subjected to the test.
Ti-Cr-V 합금의 수소화-탈수소화에 따른 상천이 및 열처리에 의한 수소저장특성의 향상
유정현,조성욱,심건주,최국선,박충년,최전,You, Jeong-Hyun,Cho, Sung-Wook,Shim, Gun-Choo,Choi, Good-Sun,Park, Choong-Nyeon,Choi, Jeon 한국수소및신에너지학회 2006 한국수소 및 신에너지학회논문집 Vol.17 No.2
The alloys which compositions were represented by the formula, $Ti_{(0.22+X)}Cr_{(0.28+1.5X)}V_{(0.5-2.5X)}$ ($0{\leq}X{\leq}0.12$), had the total hydrogen storage capacity higher than 3 wt% and the effective hydrogen storage capacity higher than 1.4 wt%. Particularly, among all the tested alloys, the $Ti_{0.32}Cr_{0.43}V_{0.25}$ alloy exhibited the best effective hydrogen storage capacity of 1.65 wt%. Furthermore, the reversible bcc${\leftrightarrow}$fcc structural transition was observed with hydrogenation and dehydrogenation, which predicted the possibility of pressure cycling. EDS analysis revealed micro-segregation, which suggested the necessity of microstructure homogenization by heat treatment. The $Ti_{0.32}Cr_{0.43}V_{0.25}$ alloy was selected for heat treatment and for other related studies. The results showed that the total and the effective hydrogen storage capacity increased to 3.7 wt% and 2.3 wt%, respectively. The flatness of the plateau region was also greatly improved and heat of hydride formation was determined to be approximately -36 kJ/mol $H_2$.
Zr계 수소저장합금의 전극특성에 미치는 은 첨가의 영향
노학(Hak Noh),정소이(So Yi Jeong),최승준(Seung Jun Choi),최전(Jeon Choi),서찬열(Chan Yeol Seo),박충년(Choong Nyeon Park) 한국수소및신에너지학회 1997 한국수소 및 신에너지학회논문집 Vol.8 No.3
The effects of Ag addition to Zr-based hydrogen storage alloys (Zr<sub>0.7</sub>Ti<sub>0.3</sub>V<sub>0.4</sub>Ni<sub>1.2</sub>Mn<sub>0.4</sub>, Zr<sub>0.7</sub>Ti<sub>0.3</sub>V<sub>0.4</sub>Ni<sub>1.2</sub>Mn<sub>0.3</sub>Cr<sub>0.1</sub> and Zr<sub>0.6</sub>Ti<sub>0.4</sub>V<sub>0.4</sub>Ni<sub>1.2</sub>Mn<sub>0.3</sub>Fe<sub>0.1</sub>) on the electrode properties were examined. Ag-free and Ag-added Ze-based alloys were prepared by arc melting, crushed mechanically, and subjected to the electrochemical measurement. In Zr<sub>0.7</sub>Ti<sub>0.3</sub>V<sub>0.4</sub>Ni<sub>1.2</sub>Mn<sub>0.4</sub> alloy, 0.08 wt% Ag addition to the alloy improved the activation rate. Also Ag addition improved both activation property and discharge capacity in Zr<sub>0.7</sub>Ti<sub>0.3</sub>V<sub>0.4</sub>Ni<sub>1.2</sub>Mn<sub>0.3</sub>Cr<sub>0.1</sub>. For these Ag-added alloys, discharge capacities with the change of charge-discharge current density(10㎃, 15㎃ and 30㎃) are almost constant. Showing very high rate capability, discharge capacity of Zr<sub>0.6</sub>Ti<sub>0.4</sub>V<sub>0.4</sub>Ni<sub>1.2</sub>Mn<sub>0.3</sub>Fe<sub>0.1</sub> alloy increased by Ag addition to the alloy. When the amount of Ag addition in Zr<sub>0.7</sub>Ti<sub>0.3</sub>V<sub>0.4</sub>Ni<sub>1.2</sub>Mn<sub>0.4</sub> allay increased too much, the electrode properties became worse. Unveiling mechanism of effect of Ag addition is now progressing in our laboratory.
압연이 Ni-MH 2차전지용 금속수소화물 전극의 충 · 방전 특성에 미치는 영향
박원(Won Park),장상민(Sang Min Chang),최승준(Seung Jun Choi),노학(Hak Noh),최전(Jeon Choi),박충년(Choong Nyeon Park) 한국수소및신에너지학회 1996 한국수소 및 신에너지학회논문집 Vol.7 No.2
The effect of rolling on the charge-discharge property was studied for metal hydride negative electrode. (LM)Ni<sub>3.6</sub>Al<sub>0.4</sub>Co<sub>0.7</sub>Mn<sub>0.3</sub>(pleateau pressure : below 1 atm at room temperature, volume expansion : 9%, entalpy : 8.7㎉/㏖H₂) alloy was prepared by arc melting, and then it was coated with various copper weight percent. The copper coated alloys were then rolled with the different reduction ratio. From the results, it was found that the maximum discharge capacity increased with increasing reduction ratio, and 15wt% copper coated sample shows the highest discharge capacity, 324㎃h/g, after rolling with 30% reduction ratio. In view of cycle life for the negative electrode, the 15wt% copper coated electrode which was rolled with 13% reduction ratio showed the longest cycle life compared with other electrodes.
Ball milling한 AB₂계 금속수소화물 전극의 전기화학적 특성
심종수(Jong Su Shim),오세웅(Se Ung Oh),노학(Hak Noh),최전(Jeon Choi),서찬열(Chan Yeol Seo),박충년(Choong Nyeon Park),최승준(Seung Jun Choi) 한국수소및신에너지학회 1997 한국수소 및 신에너지학회논문집 Vol.8 No.4
The electrochemical properties of the AB₂-type (Zr-Ti-V-Ni-Cr-Co-Mn) metal hydride electrodes prepared by ball milling with AB<sub>5</sub>-type {(LM)Ni<sub>3.6</sub>Al<sub>0.4</sub>Co<sub>0.7</sub>Mn<sub>0.3</sub>}(LM : Lanthanum-rich mischmetal) alloy powder as a surface activator were investigated. By ball milling with AB<sub>5</sub> type alloy powder, the activation of AB₂ type metal hydride electrode was accelerated resulting in an increase of discharge capacity from 35% to 85% of the maximum capacity at the first cycle. As the amount of surface activator increased the activation rate increased, whereas the discharge capacity increased with 10wt% and decreased with 20wt% addition of the surface activator. When the amount of the surface activator was kept constant as 10wt%, the discharge capacity and the activation rate increased with ball milling time up to 20 hours. However beyond 20 hours of ball milling time, they decreased drastically due to the nano-crystallization or amorphorzation of the alloy powder.
이현규,최전,박충년 대한금속재료학회(대한금속학회) 1995 대한금속·재료학회지 Vol.33 No.2
The properties of the metal hydride electrode prepared with PTFE as a binder have been investigated. The LMNi_(4.5)Co_(0.1)Mn_(0.2)Al_(0.2) hydrogen storage alloy powders were coated by 25wt.% electroless copper plating in an acid bath, mixed with 3 to 10wt% PTFE, and then compacted at 6 ton/㎠ at room temperature. The electrode characteristics were examined through electrochemical measurements in a half cell. The electrochemical measurement showed that the addition of PTFE decreased slightly activation time at a low current. At a high current, however, the activation rate decreased with increasing the amount of PTFE. The electrode property at low temperatures was improved by adding PTFE, whereas it became worse at hgh temperatures. When the charged electrode was stored in the electrolyte for more than 1 day, the discharge capacity decreased dramatically due to a self deactivation of the alloy surfaces, but not due to a self discharge. The charge retention was scarcely changed by the addition of PTFE. The cycle life was not influenced by either one of the addition of PTFE and graphite, and sintering. On the other hand, the sintering under argon gas of low purity has oxidied the alloy powder resulting in reduction of discharge capacity. The degadration of the electrode was strongly dependent on the exposure time to electrolyte and the number of cycles.