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손종태 대한화학회 2008 Bulletin of the Korean Chemical Society Vol.29 No.9
In this study, nano-crystallized LiCoO2 was coated on the surface of Li1.05Ni0.35Co0.25Mn0.4O2 powders via sol-gel method. The influence of coated Li1.05Ni0.35Co0.25Mn0.4O2 about electrochemical behavior was discussed. The surface morphology characterization was achieved by transmission electron microscopy (TEM). Nano-crystallized LiCoO2 was clearly observed on the surfaces of Li1.05Ni0.35Co0.25 Mn0.4O2. It showed that LiCoO2 coated Li1.05Ni0.35Co0.25Mn0.4O2 cathode exhibited distinct surface morphology. Cyclic voltammertry (2.8-4.6 V) shows that the characteristic voltage transition on cycling exhibited by the bare compound are suppressed by 5 wt% LiCoO2 coating. This behavior implies that LiCoO2 prevent structural change of Li1.05Ni0.35Co0.25Mn0.4O2 or reaction with electrolyte on cycling. In addition, LiCoO2 coated Li1.05Ni0.35Co0.25Mn0.4O2 compound shows highly improved area-specific impedance (ASI), one of the important battery performances. From the correlation between these characteristics of bare and coated Li1.05Ni0.35Co0.25Mn0.4O2, the role of LiCoO2 coating played on the electrochemical performance of Li1.05Ni0.35Co0.25Mn0.4O2 was probed.
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Surface Treatment of LiFePo4 Cathode Material for Lithium Secondary Battery
손종태 한국전기화학회 2010 한국전기화학회지 Vol.13 No.4
In this study, nano-crystallized Al2O3 was coated on the surface of LiFePO4 powders via a novel dry coating method. The influence of coated LiFePO4 upon electrochemical behavior was discussed. Surface morphology characterization was achieved by transmission electron microscopy (TEM), clearly showing nano-crystallized Al2O3 on LiFePO4 surfaces. Furthermore,it revealed that the Al2O3-coated LiFePO4 cathode exhibited a distinct surface morphology. It was also found that the Al2O3 coating reduces capacity fading especially at high charge/discharge rates. Results from the cyclic voltammogram measurements (2.5-4.2 V) showed a significant decrease in both interfacial resistance and cathode polarization. This behavior implies that Al2O3 can prevent structural change of LiFePO4 or reaction with the electrolyte on cycling. In addition, the Al2O3coated LiFePO4 compound showed highly improved area-specific impedance (ASI), an important measure of battery performance. From the correlation between these characteristics of bare and coated LiFePO4, the role of Al2O3 coating played on the electrochemical performance of LiFePO4was probed.
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손종태(Son.Jong-Tae) 동양한문학회(구 부산한문학회) 2004 동양한문학연구 Vol.19 No.-
The novel Nae-Sung-Ji(奈城誌)was written by Kim Soo-min(金壽民)(known as Myung-Eun(明隱)) who had lived during the Youngjo to Jungjo period. This novel can be found in a collection of his writings called Myong-Eun-Jip. The bases of the Nae-Sung-Ji novel is about the following; In a dream, the hero Moo-Myong-ja met the faithful leader of Chosun and faithful leader. of Myong. Together, they had a party and talked about Gye-Yu-Iung-Lan, Moo-O-Sa-Hwa and the restoration of Danjong. They also created poetry together. Finally, the dream was over and he woke up. This study deals with the creation background, the narration development and how the work was structured. This study also tries to find the meaning of the narration discourse. The summary of this study is as follows; In the chapter 2, I reviewed the life and works of Kim Soo-min. He respected the Joo country and also had a No-Lon view of the world. He was indifferent to politics and was only interested in writing. The creation background of Nae-Sung-Ji expresses the faithfulness of the people who were enshrined in Suk-Mo-Jun at the Dong-Hak Temple. In the chapter 3, I reviewed the narration development first and then, how the work was structured. The narration development is divided into(Mong-Jun),(Mong-Joong), and(Gak-Mong). Let’s specifi치y look into the(Mong-Joong)area which is a kernel of a question.(Mong-Joong)was expanded into(Entrance(1)-Sitting- Rehearsal(1)-Entrance(2)-Debate(1)-Debate(2)-Rehearsal(2)} Sometimes the (Entrance)field can go in and out of other fields, but it still draws a clear distinction between the(Entrance),(Sitting)and (Rehearsal)fields. The reason for a clear. division between(Entrance 1 and 2),(Rehearsal 1 and 2)and(Debate 1 and 2), tells us that the acute debate of the day did the role of mitigation. Therefore, the expansion and repetition of the narration development is justified. I looked into how the work was structured by dividing it into 3 parts; the people, the event and the background. The people are divided into: ① Danjong and Geon-Mun-Hwang-Je as the hosts of the party.②Seong Sam-mun and Bang Hyo-yu as the People who judge. ③ Sa-Yuk-Sin, as faithful countrymen and loyalists that stand by their king. ④The faithful loyalists of the two countries.⑤ People of the lower classes who do not think much of the life. The event is divided into; ① Controversy over the appointment of a gatekeeper.②Controversy over admission. ③ Controversy over sitting, ④ Controversy over Mu-O-Sa-Hwa, ⑤ Controversy over the order of priority that the work should be given.⑥Controversy over the rewards granted after the examination of their services.⑦ Controversy over the inversion of Maeng-Ja and Chun-Chu. ⑧Controversy over Myung-Chul-Bon-Sin(明哲本身). ⑨ Controversy over the way of Heaven. The background is examined in Time Background called ‘Hwang-Myeong-Yeong-Ryeok’and in Spatial Background called ‘Nae-Sung’. In the 4th chapter, I looked at the narration discourse in the Nae-Sung-Ji novel. The narration discourse is divided into 3 problems; ① The throne usurpation problem. ②The suspicion way of Heaven problem. ③ The genuine loyalty problem. The writer was writing about a problem which was so acutely opposed during the 18th, 19th century. He did 상 lis through a style called Mong-U-Rok. In the 5th chapter, I arrange the things to look into, 18th century that Kim Su-min existed was the time which the task is achieved to clarify loyal retainer who is connected, he wrote the Nae-Sung-Ji in such course. The intention to write Nae-Sung-Ji is to clear loyal retainer and traitor who existed historically by the style of penman- ship, general idea of Chun-Chu and own justice idea. Nae-Sung-Ji acted a role of midway in the time which is the style of Mong-U-Rok became a long work narration.
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임정빈,손종태,Im, Jung-Bin,Son, Jong-Tae 한국전기화학회 2011 한국전기화학회지 Vol.14 No.2
[ $Li[Ni_{0.8}Co_{0.15}Al_{0.05}]O_2$ ]cathode material for lithium secondary battery is obtained using co-precipitation method. To determine the optimal metal solution concentration value, the CSTR coprecipitation was carried out at various concentration values(1-2 mol/L). The surface morphology of coated samples was characterization by SEM(scanning electron microscope) and XRD (X-Ray Diffraction)analyses. Impedance analysis and cyclic voltammogram presented that internal resistance of the cell was dependent upon the concentration of metal solution. such data is very helpful in determining the optimal content of metal solution concentration to enhancing electrochemical property by adjusting powder size distribution and crystal structure. 본 연구에서는 리튬 이차 전지의 양극 재료인 $Li[Ni_{0.8}Co_{0.15}Al_{0.05}]O_2$을 공침법(co-precipitation)을 활용하여 성공적으로 합성하였다. 이때 $Li[Ni_{0.8}Co_{0.15}Al_{0.05}]O_2$의 금속염 농도를 실험 변수로 하여 합성 조건을 변화 시키면서 금속염 농도 변화로 인한 전지 특성의 영향을 분석하였다. SEM(scanning electron microscope)과 XRD (X-Ray Diffraction) 분석결과 금속염의 농도(2몰/L)가 높을 경우 분말의 균일성과 구조의 결정성이 떨어져 전지 특성이 저하되는 현상이 발생하였다. 균일성과 결정성을 향상시키기 위하여 금속염의 농도(1몰/L)를 줄여 합성 한 결과 입도의 미분이 적고 균일성이 및 구조적 결정성이 증가됨을 확인하였다. 또한 충/방전 용량, C-rate, 사이클 등 전기화학적 특성에서도 상대적으로 우수한 특성을 보였다. 이러한 측정 결과를 바탕으로 $Li[Ni_{0.8}Co_{0.15}Al_{0.05}]O_2$ 물질의 금속염 농도에 따른 영향을 종합적으로 고찰하였다.
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