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층상계 산화물 양극의 4.6V 고전압 특성 향상에서의 Sulfone 첨가제의 역할
강준섭,남경모,황의형,권영길,송승완,Kang, Joonsup,Nam, Kyung-Mo,Hwang, Eui-Hyeong,Kwon, Young-Gil,Song, Seung-Wan 한국전기화학회 2016 한국전기화학회지 Vol.19 No.1
Capacity of layered lithium nickel-cobalt-manganese oxide ($LiNi_{1-x-y}Co_xMn_yO_2$) cathode material can increase by raising the charge cut-off voltage above 4.3 V vs. $Li/Li^+$, but it is limited due to anodic instability of conventional electrolyte. We have been screening and evaluating various sulfone-based compounds of dimethyl sulfone (DMS), diethyl sulfone (DES), ethyl methyl sulfone (EMS) as electrolyte additives for high-voltage applications. Here we report improved cycling performance of $LiNi_{0.5}Co_{0.2}Mn_{0.3}O_2$ cathode by the use of dimethyl sulfone (DMS) additive under an aggressive charge condition of 4.6 V, compared to that in conventional electrolyte, and cathode-electrolyte interfacial reaction behavior. The cathode with DMS delivered discharge capacities of $198-173mAhg^{-1}$ over 50 cycles and capacity retention of 84%. Surface analysis results indicate that DMS induces to form a surface protective film at the cathode and inhibit metal-dissolution, which is correlated to improved high-voltage cycling performance. 층상구조 삼성분계 $LiNi_{1-x-y}Co_xMn_yO_2$ 양극활물질을 4.3 V 이상 고전압으로 충전시키면 용량 증가를 기대할 수 있으나 기존 전해액의 산화안정성이 낮아 고전압 성능 구현에 제한이 있다. 본 연구에서는 설폰계 전해액 첨가제인 dimethyl sulfone (DMS), diethyl sulfone (DES), ethyl methyl sulfone (EMS)을 사용하여 $LiNi_{0.5}Co_{0.2}Mn_{0.3}O_2$ 양극의 고전압 특성을 향상시키고자 한다. 본 논문은 다양한 선형 sulfone계 첨가제가 포함된 전해액에서 3.0-4.6 V 전압범위에서 양극의 충방전 특성과 양극-전해액간 계면거동과 표면층 분석에 대한 내용으로 이루어져 있다. 특히 Dimethyl sulfone (DMS) 첨가제 사용시, 50 사이클 중 $198-173mAhg^{-1}$의 방전 용량과 87%의 용량유지율을 보여 기존 전해액 대비 상당히 향상된 충방전 안정성을 보였다. 표면조성 분광분석 결과, DMS 첨가제 사용시 양극에 안정한 표면보호층이 형성되고 금속 용출이 억제되어 고전압 충방전 특성이 향상되었음 알 수 있었다.
강준섭(Jun Seop Kang),오상훈(Sang Hoon Oh),김상효(Sang Hyo Kim),백낙환(Nak Whan Paik) 대한소화기학회 1996 대한소화기학회지 Vol.28 No.4
Gastric tuberculosis is a rare disease because of the low gastric pH, paucity of lymphoid tissue in the stomach wall, and rapid emptying of gastric contents. It is difficult to diagnose without histologic examination. Authors experienced four cases of gastric tuberculosis confirmed on histologic finding of the resected specimen. Acid-fast bacilli could not be identified in any of those. Two cases were primary gastric tuberculosis with no tuberculous evidence in elsewhere, the other two cases were secondary gastric tuberculosis. The operative indications were bleeding in 2 cases, pyloric obstruction in 1 case and suspision of gastric carcinoma in 1 case. Postoperatively, with antituberculous therapy of triple regimen for 1 year, the clinica] outcome was good in a]l patients. (Korean J Gastroenterol 1996;28:561 - 565)
오상훈,김상효,최영길,강준섭 대한소화기학회 1998 대한소화기학회지 Vol.30 No.4
Background/Aims: Laparoscopic cholecystectomy has caused a monumental change in general surgery by affecting a trend toward minimally invasive surgical procedures and has become the standard treatment for benign gallbladder disease. The aim of this study is to review the results of one thousand consecutive patients who underwent laparoscopic cholecystectomy. Methods: A retrospective analysis of 1,000 laparoscopic cholecystectomies was performed at Inje University Pusan Paik Hospital from April 1992 to June 1997. Results: There were 403 males and 597 females, with ages ranging from 14 to 85 years. One hundred thirty nine patients had a clinical history of previous abdominal operations and 18 patients were associated with liver cirrhosis. Preoperatively, 168 patients underwent endoscopic retrograde cholangiopancreatography and 60 patients were found to have unsuspected common bile duct stones. The success rate of endoscopic sphincterotoy in patients with cotnmon bi]e duct stones was 91.6%. Postoperative diagnosis was chonic cho]ecystitis with stone in 824 patients, acute cholecystitis with stone in 110 patients, acalculous cho]ecystitis in 15 patients, benign tumor in 37 patients, and ga]lbladder carcinoma in 13 patients. We converted to open laparotomy in fifty three patients(5.3%) for a variety of reasons. In patients with nonvisualized gallbladder on oral cholecystogram, the rate of conversion was significantly high. Operative complications occurred in 16 patients(1.6%). There was no operative mortality. Average duration of postoperative hospitalization was 2.5 days. Conclusions: Laparoscopic cholecystectomy is a safe and effective treatment modality for benign gallbladder disease.