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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.
황원민,백동호,김동호,홍주영,한승연,박근영,임규,임동미,강재구 대한내분비학회 2015 Endocrinology and metabolism Vol.30 No.4
Background: Inflammatory factors and β-cell dysfunction due to high-fat diets aggravate chronic diseases and their complications. However, omega-3 dietary fats have anti-inflammatory effects, and the involvement of autophagy in the etiology of diabetes has been reported. Therefore, we examined the protective effects of autophagy on diabetes using fat-1 transgenic mice with omega-3 self-synthesis capability. Methods: Streptozotocin (STZ) administration induced β-cell dysfunction in mice; blood glucose levels and water consumption were subsequently measured. Using hematoxylin and eosin (H&E) and Masson’s trichrome staining, we quantitatively assessed STZ-induced changes in the number, mass, and fibrosis of pancreatic islets in fat-1 and control mice. We identified the microtubule-associated protein 1A/1B light chain 3-immunoreactive puncta in β-cells and quantified p62 levels in the pancreas of fat-1 and control mice. Results: STZ-induced diabetic phenotypes, including hyperglycemia and polydipsia, were attenuated in fat-1 mice. Histological determination using H&E and Masson’s trichrome staining revealed the protective effects of the fat-1 expression on cell death and the scarring of pancreatic islets after STZ injection. In the β-cells of control mice, autophagy was abruptly activated after STZ treatment. Basal autophagy levels were elevated in fat-1 mice β-cells, and this persisted after STZ treatment. Together with autophagosome detection, these results revealed that n-3 polyunsaturated fatty acid (PUFA) enrichment might partly prevent the STZ-related pancreatic islet damage by upregulating the basal activity of autophagy and improving autophagic flux disturbance. Conclusion: Fat-1 transgenic mice with a n-3 PUFA self-synthesis capability exert protective effects against STZ-induced β-cell death by activating autophagy in β-cells.
A study on thermal performance of batteries using thermal imaging and infrared radiation
김희정,이준현,백동호,이진경 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.45 No.-
This study attempted to improve the performance of pouch-type lithium iron phosphate battery(LiFePO4) through analysis on its degradation mechanism at a high rate (10 C) for the purpose ofobserving resistance and electrochemical changes in each material when a battery was manufacturedconsidering the low electrical conductivity and of lithium iron phosphate and properties of cathodematerials. For this, the life and safety of lithium batteries are evaluated after forming dendrites throughthe reduction of lithium at the negative electrode (graphite) as resistance in LiFePO4. The components ofLiFePO4, which generate this kind of resistance includes tab, electrolytes, cathode active materials, anodeactive materials, binders and conductive materials. The main cathode (lithium-ion phosphate) and anode(natural graphite) materials were fabricated in 90% and 96% respectively, using conductive materials andbinders. For a case, a 20 Ah Al pouch was fabricated. A full cell was fabricated with the best materials andcomponents through analysis on resistance characteristic. Then, LiFePO4 was thermally safer with a longlifespan than the conventional high-rate output. For analysis on materials, in addition, basic materialanalysis was performed through impedance, X-ray diffraction (XRD), X-Scan andfield emission scanningelectron (FESEM). After tracing heat generated within the battery using infrared radiation (IR), the degreeof degradation was examined. Then, the degradation rates of lithium batteries and reliability ofmeasurements were comparatively assessed. When analyzed with an infrared camera, temperaturerapidly rose up to over 80 C during charge and discharge. A battery was fabricated using an industrialengineering method which can secure internal resistance-lowering slurry and coating dispersionprocesses and reduce resistance in the binder and tab joint. As a result, it was able to substituteconventional LiFePO4 with high internal resistance, disperse heat inside the cell and increase its lifespan.