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RISS 인기검색어
- 검색키워드
- 저자 : Gumjae Park (검색결과 4 건)
- 무료
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- 유료
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Park, Gumjae,Sim, Sungju,Lee, Jueun,Lee, Sang-Min Elsevier 2015 Journal of Alloys and Compounds Vol.639 No.-
<P><B>Abstract</B></P> <P>Mo<SUB>0.8</SUB>Si<SUB>0.2</SUB>P<SUB>2</SUB> was synthesized via a simple mechanical milling method to improve the electrochemical properties of MoP<SUB>2</SUB>. It was found that Si ion was successfully doped and well dispersed on pristine MoP<SUB>2</SUB> layered structure without any structure changes. The electrochemical properties of Mo<SUB>0.8</SUB>Si<SUB>0.2</SUB>P<SUB>2</SUB> anode were increasingly improved. It showed a higher initial charge capacity of 783mAhg<SUP>−1</SUP> and better cycle retention rate of 93.2% compared with the MoP<SUB>2</SUB> alloy anode, respectively. When lithium uptake in Mo<SUB>0.8</SUB>Si<SUB>0.2</SUB>P<SUB>2</SUB> anode during the first discharge process, silicon was partially decomposed and well dispersed in sustained Mo<SUB>0.8</SUB>Si<SUB>0.2</SUB>P<SUB>2</SUB> structure. Partially decomposed Si in Mo<SUB>0.8</SUB>Si<SUB>0.2</SUB>P<SUB>2</SUB> act as electrochemically alloying material for increasing the reversible capacity, whereas sustained Mo<SUB>0.8</SUB>Si<SUB>0.2</SUB>P<SUB>2</SUB> serve as host material with lithium intercalation reaction and prevent to aggregation of decomposed silicon.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Silicon doped MoP<SUB>2</SUB> was synthesized by mechanical milling method. </LI> <LI> The doped Si can be dispersed in pristine MoP<SUB>2</SUB> structure. </LI> <LI> The electrochemical performances of Mo<SUB>0.8</SUB>Si<SUB>0.2</SUB>P<SUB>2</SUB> are better than those of MoP<SUB>2</SUB> anode. </LI> <LI> Si in Mo<SUB>0.8</SUB>Si<SUB>0.2</SUB>P<SUB>2</SUB> act as electrochemical alloying material for increasing reversible capacity. </LI> </UL> </P>
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Performance of Lithium-Ion Battery with Tin-Phosphate Glass Anode and Its Characteristics
Yamauchi, Hideo,Park, Gumjae,Nagakane, Tomohiro,Honma, Tsuyoshi,Komatsu, Takayuki,Sakai, Tetsuo,Sakamoto, Akihiko The Electrochemical Society 2013 Journal of the Electrochemical Society Vol.160 No.10
<P>The performance of a lithium-ion battery (LiB) fabricated with a tin-phosphate glass anode was studied as well as the characteristics of the anode. It was confirmed that the total positive charge of Sn<SUP>2+</SUP> ions in the glass anode is compensated by a reaction with lithium during the first charge by forming tin crystals. It was observed after the first charge that the glass is converted into a nanocomposite in which the metallic crystals are embedded in an amorphous lithium phosphate matrix. A half-cell fabricated with the glass anode showed a reproducible capacity of 550 mAh/g at room temperature, which was much higher than that of the cell with a graphite anode. The cell also showed a steady capacity of 160 mAh/g even at −20°C with no deposition of lithium dendrites. A full-cell fabricated with the glass anode and LiMn<SUB>2</SUB>O<SUB>4</SUB> cathode showed a good life cycle performance at 60°C along with no degradation in its life cycle performance. The tin-phosphate glass is a promising candidate as a new anode material that realizes LiBs with a high energy density that can be used over a wide temperature range.</P>
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Chae-won Kim,Junghee Choi,Jin-Hyeok Choi,Ji-Youn Seo,Gumjae Park The Korean Electrochemical Society 2023 Journal of electrochemical science and technology Vol.14 No.2
Aqueous zinc-ion batteries are considered as promising alternatives to lithium-ion batteries for energy storage owing to their safety and cost efficiency. However, their lifespan is limited by the irreversibility of Zn anodes because of Zn dendrite growth and side reactions such as the hydrogen evolution reaction and corrosion during cycling. Herein, we present a strategy to restrict direct contact between the Zn anode and aqueous electrolyte by fabricating a protective layer on the surface of Zn foil via phosphidation method. The Zn<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub> protective layer effectively suppresses Zn dendrite growth and side reactions in aqueous electrolytes. The electrochemical properties of the Zn<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>@Zn anode, such as the overpotential, linear polarization resistance, and hydrogen generation reaction, indicate that the protective layer can suppress interfacial corrosion and improve the electrochemical stability compared to that of bare Zn by preventing direct contact between the electrolyte and the active sites of Zn. Remarkably, MnO<sub>2</sub> Zn<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>@Zn exhibited enhanced reversibility owing to the formation a stable porous layer, which effectively inhibited vertical dendrite growth by inducing the uniform plating of Zn<sup>2+</sup> ions underneath the formed layer.
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Lee, Yongwon,Lee, Tae Kyung,Kim, Saehun,Lee, Jeongmin,Ahn, Youngjun,Kim, Koeun,Ma, Hyeonsu,Park, Gumjae,Lee, Sang-Min,Kwak, Sang Kyu,Choi, Nam-Soon Elsevier 2020 Nano energy Vol.67 No.-
<P><B>Abstract</B></P> <P>Li metal anodes and Ni-rich layered oxide cathodes with high reversible capacities are promising candidates for the fabrication of high energy density batteries. However, low Coulombic efficiency, safety hazards from likely vertical Li growth, and morphological instability of Ni-rich cathodes hinder the practical applications of these electrodes. Here, we report that fluorinated compounds can be employed as interface modifiers to extend the applicable voltage range of ether-based electrolytes, which have been used specifically so far for lithium metal batteries with charging cut-off voltages lower than 4 V (vs. Li/Li<SUP>+</SUP>). A complementary electrolyte design using both 1,1,2,2-tetrafluoroethyl-2,2,3,3-tetrafluoropropyl ether and fluoroethylene carbonate in concentrated ether-based electrolytes significantly improves the capacity retention (99.1%) in a Li|LiNi<SUB>0.8</SUB>Co<SUB>0.1</SUB>Mn<SUB>0.1</SUB>O<SUB>2</SUB> full cell, with a high Coulombic efficiency of 99.98% after 100 cycles at 25 °C. Thus, the modified electrolyte system is promising for addressing the reductive and oxidative decompositions of labile ether-based electrolytes in high energy density Li metal batteries with Ni-rich cathodes.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Ether-based electrolyte formulation for 4V-class Li metal batteries is presented. </LI> <LI> FEC and TTE are employed as the electrode–electrolyte interface modifiers. </LI> <LI> Fluorine-enriched interfaces enable high-performance Li metal batteries. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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