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- 저자 : 김해빈 ( Haebeen Kim ) (검색결과 6 건)
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리튬이온 이차전지용 고로딩 LiCoO<sub>2</sub> 양극의 전극설계에 따른 전기화학적 성능연구
김해빈,류지헌,Kim, Haebeen,Ryu, Ji Heon 한국전기화학회 2020 한국전기화학회지 Vol.23 No.2
Highly loaded LiCoO<sub>2</sub> positive electrodes are prepared to construct high-energy density lithium-ion batteries, their electrochemical performances are evaluated. For the standard electrode, a loading of about 2.2 mAh/㎠ is used, and for a high-loading electrode, an electrode is manufactured with a loading level of about 4.4 mAh/㎠. The content of carbon black as electronic conducting additive, and the porosity of the electrode are configured differently to compare the effects of electron conduction and ionic conduction in the highly loaded LiCoO<sub>2</sub> electrode. It is expected that the electrochemical performance is improved as the amount of the carbon black increases, but the specific capacity of the LiCoO<sub>2</sub> electrode containing 7.5 weight% carbon black is rather reduced. When the conductive material is excessively provided, an increase of electrode thickness by the low content of the LiCoO<sub>2</sub> active material in the same loading level of the electrode is predicted as a cause of polarization growth. When the electrode porosity increases, the path of ionic transport can be extended, but the electron conduction within the electrode is disadvantageous because the contact between the active material and the carbon black particles decreases. As the electrode porosity is lowered through the sufficient calendaring of the electrode, the electrochemical performance is improved because of the better contact between particles in the electrode and the reduced electrode thickness. In the electrode design for the high-loading, it is very important to construct the path of electron conduction as well as the ion transfer and to reduce the electrode thickness.
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김은하 ( Eunha Kim ),김해빈 ( Haebeen Kim ),김지윤 ( Jiyoon Kim ) 서강대학교 학생생활상담연구소 2021 인간이해 Vol.42 No.2
Belief in an unjust world(BUW) refers to a belief that the world is unjust and people do not get what they deserve. The purpose of this study was to translate and validate the Unjust Views Scale (UJVS), a scale currently utilized in the U.S. to measure BUW. For this, we conducted exploratory factor analysis and reliability test, which resulted in 4 items and one factor. We also compared the fit of Model 1 (single factor structure-BJW and BUW as one dimension), Model 2 (second factor structure-BJW and BUW loading onto a latent factor of unjust world views), and Model 3(unidimensional factor structure of UJV) using confirmatory factor analysis and found that the revised Model 3 was statistically better than Model 1 and 2. The tests of convergent, concurrent and incremental validities revealed strong evidence for the validity of the Korean Unjust Views Scale.
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리튬이온 이차전지용 고용량 KVO<sub>3</sub> 음극의 전기화학적 성능개선
김태훈,김경래,박환동,김해빈,류지헌,Kim, Tae Hun,Gim, Gyeong Rae,Park, Hwandong,Kim, Haebeen,Ryu, Ji Heon 한국전기화학회 2019 한국전기화학회지 Vol.22 No.4
Vanadium oxide based materials have been studied as novel negative electrode materials in lithium-ion batteries (LIBs) because of their high specific capacity. In this study, potassium metavanadate ($KVO_3$) was synthesized and its electrochemical properties are evaluated as a negative electrode materials. The aqueous solution of $NH_4VO_3$ is mixed with a stoichiometric amount of KOH. The solution is boiled to remove $NH_3$ gas and dried to obtain a precipitate. The obtained $KVO_3$ powders are heat-treated at 300 and $500^{\circ}C$ for 8 h in air. As the heat treatment temperature increases, the initial reversible capacity decreases, but the cycle performance and Coulombic efficiency are improved slightly. On the contrary, the electrochemical performances of the $KVO_3$ electrodes are greatly improved when a polyacrylic acid (PAA) as binder was used instead of polyvinylidene fluoride (PVDF) and a fluoroethylene carbonate (FEC) was used as electrolyte additive. The initial reversible capacity of the $KVO_3$ is 1169 mAh/g and the Coulombic efficiency is improved to 76.3% with moderate cycle performance. The $KVO_3$ has the potential as a novel high-capacity negative electrode materials.
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리튬이온 이차전지용 양극물질로서 Na<sub>x</sub>Fe<sub>2</sub>(CN)<sub>6</sub>의 전기화학적 성능개선 연구
유성태,윤승주,강정민,김해빈,류지헌,Yoo, Seong Tae,Yoon, Seung Ju,Kang, Jeong Min,Kim, Haebeen,Ryu, Ji Heon 한국전기화학회 2020 한국전기화학회지 Vol.23 No.1
The Prussian blue analogues of Fe<sub>2</sub>(CN)<sub>6</sub> and Na<sub>x</sub>Fe<sub>2</sub>(CN)<sub>6</sub> are prepared by precipitation method and evaluated the electrochemical characteristics as positive electrode materials for lithium-ion batteries (LIBs) because of their low cost. Fe<sub>2</sub>(CN)<sub>6</sub> shows a low reversible capacity of 34.6 mAh g<sup>-1</sup>, whereas sodium-containing Na<sub>x</sub>Fe<sub>2</sub>(CN)<sub>6</sub> exhibits a reversible capacity of 107.5 mAh g<sup>-1</sup> when the discharge process proceeds first. When charging is first carried out to remove sodium in the structure, the reversible capacity of 114.1 mAh g<sup>-1</sup> is achieved and the cycle performance is further improved. In addition, Na<sub>x-</sub>Fe<sub>2</sub>(CN)<sub>6</sub> is synthesized at 0℃, room temperature (RT), and 60℃, respectively. Regardless of the synthesis temperature, Na<sub>x</sub>Fe<sub>2</sub>(CN)<sub>6</sub> shows similar initial reversible capacity, but the crystallite size is formed smaller and improved cycle performance when synthetic temperature is lower. The sample synthesized at 0℃ shows a reversible capacity of 86.4 mAh g<sup>-1</sup> at the 120<sup>th</sup> cycle and maintains 76.8% of the initial capacity.
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