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졸-겔법에 의해 제조된 LiMPO<sub>4</sub>(M = Fe, Mn) 양극 활물질의 전기화학적 특성
김재광,백동호,신용조,안주현,서양곤,김지수,윤석준,조명훈,Kim, Jae-Kwang,Baek, Dong-Ho,Shin, Yong-Jo,Ahn, Jou-Hyeon,Seo, Yang-Gon,Kim, Chi-Su,Yoon, Seok-Jun,Cho, Myung-Hun 한국전기화학회 2008 한국전기화학회지 Vol.11 No.2
리튬이차전지의 양극 활물질로 카본 코팅된 $LiFePO_4$와 $LiMn_{0.4}Fe_{0.6}PO_4$를 졸-겔방법으로 합성하였다. 제조된 양극 활물질을 X-선 회절분석과 주사전자현미경을 통하여 불순물이 존재하지 않으며 기공이 잘 발달되어 있다는 것을 확인하였다. 액체전해질을 사용하여 0.1 C-rate의 전류밀도에서 충방전하였을 경우 $LiFePO_4$는 132 mAH/g, $LiMn_{0.4}Fe_{0.6}PO_4$는 145 mAh/g의 방전용량을 각각 나타내었다. 전기방사에 의해 만들어진 겔 고분자 전해질을 사용하였을 경우에 $LiFePO_4$와 $LiMn_{0.4}Fe_{0.6}PO_4$는 각각 114, 130 mAh/g의 우수한 방전용량을 나타내었다. Carbon-coated $LiFePO_4$ and $LiMn_{0.4}Fe_{0.6}PO_4$ cathode materials for lithium batteries were synthesized by a sol-gel method. X-ray diffraction and scanning electron microscopy data showed that the cathode materials are pure crystalline and are surrounded by porous carbon. The initial discharge capacities of $LiFePO_4$ and $LiMn_{0.4}Fe_{0.6}PO_4$ with the liquid electrolyte of 1M $LiPF_6$ in EC/DMC are 132 mAh/g and 145 mAh/g, respectively, at current density of 0.1 C-rate. $LiFePO_4$ and $LiMn_{0.4}Fe_{0.6}PO_4$ with an electrospun polymer-based electrolyte exhibit initial discharge capacities of 114 and 130 mAh/g at 0.1 C-rate at room temperature, respectively.
괭생이모자반으로부터 미백과 주름개선 생리활성물질 생산을 위한 초음파 추출공정 개발
감다혜(Da Hye Gam),홍지우(Ji Woo Hong),전성진(Seong Jin Jeon),백동호(Dong Ho Baek),김진우(Jin Woo Kim) 한국생물공학회 2020 KSBB Journal Vol.35 No.4
Statistically-based optimization using response surface methodology was performed to derive optimal extraction conditions for the extraction of bioactive compounds with antioxidant activity, skin whitening, and anti-wrinkle effects from Sargassum horneri, marine waste, using the ultrasound-assisted extraction (UAE). The main UAE process variables, extraction time (5.3~18.7 min, X₁), extraction temperature (22.4~79.6°C, X₂), and ethanol concentration (0~99.5% v/v, X₃), were selected through preliminary experiments and optimized using central composite design at five levels. Total phenolic content (TPC), total flavonoid content (TPC), DPPH radical scavenging activity (RSA), tyrosinase activity inhibition (TAI), and collagenase activity inhibition (CAI) were analyzed and second-order polynomial models were generated for predicting the responses. The optimum UAE conditions for enhancing antioxidants, skin whitening, and anti-wrinkle effects were extraction time of 11.7 min, extraction temperature of 54.8°C, and ethanol concentration of 73.0%, under which RSA, TAI, and CAI were 29.1%, 78.5%, and 83.6%, respectively. In this study, we proposed an extraction process for the production of cosmetic materials that have a combination of antioxidant, whitening, and wrinkle effects from S.horneri, which are marine waste.