Synthesis, Characterization and Electrochemical Performance of Vanadium Oxide/Reduced Graphene Oxide Composite for Lithium- ion Battery Cathodes

( Puritut Nakhanivej ),박호석 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0

Vanadium Oxide (V2O5)/reduced graphene oxide (rGO) composite was synthesized by spray freeze-drying method combined with heat treat-ment process. The aim of this work is to increase the electrochemical performance in term of capacity, rate capability and cyclic stability. We have investigated the physical properties and morphologies by using characterizations. The results indicated that V2O5 nanoparticles were maintained their crystal structure and well-trapped by rGO. For the lithium ion battery (LIB) application, V2O5/rGO composite exhibited superior electrochemical performance compared to pristine V2O5 and rGO due to high electrical conductivity, large surface area of hierar-chical structure, fast ion diffusion and structural stability provided by conductive rGO. The initial discharge capacity up to 375 mAh g^-1 could be obtained as well as good rate capability. Our work may open up new route and material design for the improvement of LIB cathodes.

High-energy solid-state asymmetric supercapacitor based on nickel vanadium oxide/NG and iron vanadium oxide/NG electrodes

Guo, Meng,Balamurugan, Jayaraman,Kim, Nam Hoon,Lee, Joong Hee Elsevier 2018 Applied Catalysis B Vol.239 No.-

<P><B>Abstract</B></P> <P>Solid-state supercapacitors (SCs) are well-known as one of the most competitive power sources for modern electronics. However, most of the reported solid-state SCs suffer from low specific capacitance and energy density. Herein, a novel strategy for the synthesis of nickel vanadium oxide (Ni<SUB>3</SUB>V<SUB>2</SUB>O<SUB>8</SUB>) and iron vanadium oxide (Fe<SUB>2</SUB>VO<SUB>4</SUB>) nanoparticles (NPs) anchored nitrogen doped graphene (NG) for high energy solid-state asymmetric SC (ACS) through a simple and cost-effective hydrothermal technique was demonstrated. SEM and TEM analysis reveals that active Ni<SUB>3</SUB>V<SUB>2</SUB>O<SUB>8</SUB> and Fe<SUB>2</SUB>VO<SUB>4</SUB> NPs with uniform size are anchored on NG sheets. Electrochemical performance of Ni<SUB>3</SUB>V<SUB>2</SUB>O<SUB>8</SUB>/NG and Fe<SUB>2</SUB>VO<SUB>4</SUB>/NG electrodes showed that both have ultra-high specific capacitances (∼1898 F g<SUP>−1</SUP> and 590 F g<SUP>−1</SUP> at current density of 1 A g<SUP>−1</SUP>, respectively), tremendous rate capabilities, and superior cycling stabilities. Most significantly, solid-state ASC consisting of Ni<SUB>3</SUB>V<SUB>2</SUB>O<SUB>8</SUB>/NG as a cathode and Fe<SUB>2</SUB>VO<SUB>4</SUB>/NG as an anode which achieves a high energy density of ∼77.2 W h kg<SUP>−1</SUP> at a power density of 863 W kg<SUP>−1</SUP> and an ultra-long cycle life (capacitance retention of ∼83.3% after 20,000 cycles). This study emphasizes the development of a wide variety of energy storage systems for modern electronics.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Ni<SUB>3</SUB>V<SUB>2</SUB>O<SUB>8</SUB> and Fe<SUB>2</SUB>VO<SUB>4</SUB> NPs anchored NG synthesized by simple and cost-effective hydrothermal technique. </LI> <LI> Ni<SUB>3</SUB>V<SUB>2</SUB>O<SUB>8</SUB>/NG and Fe<SUB>2</SUB>VO<SUB>4</SUB>/NG hybrids are employed as supercapacitor electrodes. </LI> <LI> Both electrodes show ultra-high specific capacitance with excellent rate capability and superior cycling stability. </LI> <LI> The ASC achieves a high energy density of ∼77.2 W h kg<SUP>−1</SUP> at 863 W kg<SUP>−1</SUP> and an ultra-long cycle life. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Efficient electrochemical performance of MnO2 nanowires interknitted vanadium oxide intercalated nanoporous carbon network as cathode for aqueous zinc ion battery

Rimsha Mehek,Naseem Iqbal,Tayyaba Noor,Yuanshen Wang,Alexey Y. Ganin 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.123 No.-

Rechargeable aqueous Zn-ion batteries (AZIBs) have emerged as promising large-scale energy storagedevices because of their low cost and good safety characteristics. Vanadium oxide-based materials havebeen actively studied as future cathode materials for AZIBs, benefiting from their suitable voltage andhigh specific capacity. However, poor rate performance and capacity deterioration due to the instabilityof their oxides is still a hurdle in their commercialization. Herein, we attempted to test a methodologyinvolving the carbonization of V-MIL-101 to prepare a composite material consisting of vanadium oxidenanoparticles embedded within the nanoporous carbon network, which remarkably enhances the electrochemicalperformance of the material as a cathode in an aqueous Zn-ion battery system. The manganeseoxide loading further stabilized the composite material, which improved the cathode material’srate capability in aq. zinc ion battery cathode. The cathode material MnO2@NVC composite exhibitedthe capacity of 299 mAhg1 at 0.1C rate for 100 cycles benefitting from the synergistic effect of the highconductivity of Vanadium oxide nanoparticles and suitable voltage of MnO2. The materials showed superiorcapacity retention and better cycling performance than unmodified vanadium oxide nanoparticles oncarbon substrate as cathode material. The comparative morphological and electrochemical studies confirmthe improved performance, which suggests that the vanadium oxide nanoparticles anchored on ahigh surface area carbon network intertwined with manganese oxide nanowires provide enhancedconductivity.

Micro-Raman investigation of vanadium-oxide coated tubular carbon nanofibers for gas-sensing applications

Santangelo, S.,Messina, G.,Faggio, G.,Willinger, M.G.,Pinna, N.,Donato, A.,Arena, A.,Donato, N.,Neri, G. Elsevier 2010 Diamond and related materials Vol.19 No.5

Commercial tubular carbon nanofibers were uniformly coated with a 5nm thick vanadium oxide layer via a modified approach to atomic layer deposition. The composition and microstructure of the resulting hybrid material was analyzed by micro-Raman spectroscopy. The effect of the post-synthesis thermal treatment in air at temperatures in the range of 25-375<SUP>o</SUP>C was investigated in order to more deeply understand the behavior of the hybrid material in gas sensing devices. The obtained results demonstrate that the thermal treatment primarily affects the oxide coating-layer that is responsible for the sensing properties. The best sensor performance was obtained at the temperature at which the oxide layered-structure exhibits the highest structural order.

A facile pyrolysis method to prepare vanadium oxides for high performance aqueous Zn-ion battery

Zhu Haitao,Liao Shengyun,Su Boya,Ding Xiaohui,Liu Qiang 한국물리학회 2022 Current Applied Physics Vol.34 No.-

Vanadium oxides, as one of the most promising cathode materials for zinc ion batteries, have attracted extensive attention in recent years. Different from the generally used hydrothermal and solvothermal methods to adjust the composition, structure, morphology and electrical properties of vanadium oxides, we firstly adopt a simple pyrolysis method to synthesize a series of vanadium oxides and use them as cathode materials for aqueous Zn-ion battery, whose electrochemical performances is superior to most state-of-the-art vanadium oxides. The asobtained V4O7 under the calcination temperature of 700 ◦C exhibits excellent zinc ion storage performance with maximum specific capacity of 367.2 mAh g 1 at the current density of 1 A g 1, about 84.9% capacity retention after 100 cycles, excellent rate performance, high capacity. In addition, a series of structural and electrochemical characterization are used to reveal the possible mechanism of charge and discharge.

Pore-Size-Tuned Graphene Oxide Frameworks as Ion-Selective and Protective Layers on Hydrocarbon Membranes for Vanadium Redox-Flow Batteries

Kim, Soohyun,Choi, Junghoon,Choi, Chanyong,Heo, Jiyun,Kim, Dae Woo,Lee, Jang Yong,Hong, Young Taik,Jung, Hee-Tae,Kim, Hee-Tak American Chemical Society 2018 NANO LETTERS Vol.18 No.6

<P>The laminated structure of graphene oxide (GO) membranes provides exceptional ion-separation properties due to the regular interlayer spacing (<I>d</I>) between laminate layers. However, a larger effective pore size of the laminate immersed in water (∼11.1 Å) than the hydrated diameter of vanadium ions (>6.0 Å) prevents its use in vanadium redox-flow batteries (VRFB). In this work, we report an ion-selective graphene oxide framework (GOF) with a <I>d</I> tuned by cross-linking the GO nanosheets. Its effective pore size (∼5.9 Å) excludes vanadium ions by size but allows proton conduction. The GOF membrane is employed as a protective layer to address the poor chemical stability of sulfonated poly(arylene ether sulfone) (SPAES) membranes against VO<SUB>2</SUB><SUP>+</SUP> in VRFB. By effectively blocking vanadium ions, the GOF/SPAES membrane exhibits vanadium-ion permeability 4.2 times lower and a durability 5 times longer than that of the pristine SPAES membrane. Moreover, the VRFB with the GOF/SPAES membrane achieves an energy efficiency of 89% at 80 mA cm<SUP>-2</SUP> and a capacity retention of 88% even after 400 cycles, far exceeding results for Nafion 115 and demonstrating its practical applicability for VRFB.</P> [FIG OMISSION]</BR>

Fabrication, Optoelectronic and Photocatalytic Properties of Some Composite Oxide Nanostructures

Zou, C.W.,Gao, W. The Korean Institute of Electrical and Electronic 2010 Transactions on Electrical and Electronic Material Vol.11 No.1

This is an overview paper reporting our most recent work on processing and microstructure of nano-structured oxides and their photoluminescence and photo-catalysis properties. Zinc oxide and related transition metal oxides such as vanadium pentoxide and titanium dioxide were produced by a combination of magnetron sputtering, hydrothermal growth and atmosphere controlled heat treatment. Special morphology and microstructure were created including nanorods arrays, core-brushes, nano-lollipops and multilayers with very large surface area. These structures showed special properties such as much enhanced photoluminescence and chemical reactivity. The photo-catalytic properties have also been promoted significantly. It is believed that two factors contributed to the high reactivity: the large surface area and the interaction between different oxides. The transition metal oxides with different band gaps have much enhanced photoluminescence under laser stimulation. Use of these complex oxide structures as electrodes can also improve the energy conversion efficiency of solar cells. The mixed oxide complex may provide a promising way to high-efficiency photo emitting materials and photo-catalysts.

Fabrication, Optoelectronic and Photocatalytic Properties of Some Composite Oxide Nanostructures

C. W. Zou,W. Gao 한국전기전자재료학회 2010 Transactions on Electrical and Electronic Material Vol.11 No.1

This is an overview paper reporting our most recent work on processing and microstructure of nano-structured oxides and their photoluminescence and photo-catalysis properties. zinc oxide and related transition metal oxides such as vanadium pentoxide and titanium dioxide were produced by a combination of magnetron sputtering, hydrothermal growth and atmosphere controlled heat treatment. Special morphology and microstructure were created including nanorods arrays, core-brushes, nano-lollipops and multilayers with very large surface area. These structures showed special properties such as much enhanced photoluminescence and chemical reactivity. The photo-catalytic properties have also been promoted significantly. It is believed that two factors contributed to the high reactivity: the large surface area and the interaction between different oxides. The transition metal oxides with different band gaps have much enhanced photoluminescence under laser stimulation. Use of these complex oxide structures as electrodes can also improve the energy conversion efficiency of solar cells. The mixed oxide complex may provide a promising way to high-efficiency photo emitting materials and photo-catalysts.

전해질 첨가제가 리튬 바나듐 옥사이드 전극의 성능에 미치는 영향

이제남,Lee, Je-Nam 한국전기화학회 2018 한국전기화학회지 Vol.21 No.3

최근 휴대용 기기의 급속한 발전이 이뤄지고, 다양한 전자제품에서 높은 성능의 이차 전지가 요구됨에 따라 고에너지밀도 특성을 가능케 하는 전극 재료의 연구가 주목받고 있다. 음극의 경우, 기존에 사용하고 있는 흑연재료를 대체하기 위하여 실리콘, 주석 등의 소재와 전이금속 산화물을 새로운 음극재료로 사용하려고 한다. 리튬 바나듐 옥사이드는 리튬 전이금속 산화물 기반의 음극 소재로서 흑연 대비 1.5배의 부피당 용량을 나타낼 수 있다는 장점을 가지고 있으나, 낮은 전기전도도와 입자 파쇄현상으로 인하여 전해질의 분해가 가속화되어 성능이 열화되는 문제점을 가지고 있다. 본 연구에서는 이러한 문제를 개선시키기 위하여 전해질 첨가제를 도입하여 전극/전해질 계면의 개질에 따른 리튬 바나듐 옥사이드의 전기화학적 거동 특성을 보고자 하였다. The demand for LIBs with higher energy densities has increased continuously because the emergence of wider and more challenging applications including HEV and EV has became imperative. However, in the case of anode material, graphite is insufficient to meet this need. To meet such demand, several type of negative electrode materials like silicon, tin, SiO, and transition metal oxide have been investigated for the advanced lithium secondary batteries. Recently, lithium vanadium oxide, which has a layered structure, is assumed as one of the promising anode material as alternative of graphite. This material shows a high volumetric capacity, which is 1.5 times higher than that of graphite. However, relative low electrical conductivity and particle fracture, which results in the electrolyte decomposition and loss of electric contact between electrode, induce rapid capacity decay. In this report, we investigated the effect of electrolyte additive on the electrochemical characteristics of lithium vanadium oxide.

수송용 연료전지 스택의 탄소 계열 분리판 표면에 형성된 바나듐 산화물 다층 박막의 온도-저항 특성에 관한 연구

정혜미(Hye-Mi Jung),노정훈(Jung-Hun Noh),엄석기(Sukkee Um) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11

The present experimental study was carried out to examine the applicability of crystalline vanadium oxide thin films as a potential electrical heat source. The thin solid films were formed uniformly along the edges of carbon-based separators to enhance cold-start performance of fuel cells for transportation applications. The multi-layered crystalline vanadium oxide films were synthesized by using 0.5M vanadium alkoxide precursor and then deposited onto porous graphite plates with a gas-impermeable resin through dip-coating technique and a subsequent post-heat treatment under vacuum conditions. The temperature-resistance properties, the quantitative analysis of the elemental composition, and the microstructure of the vanadium oxide films were investigated using 4-point probe, EDX, and FE-SEM, respectively. In this study, the temperature dependent electrical properties of the sol-gel derived vanadium-based films onto graphite plates were characterized by a Boltzmann sigmoidal regression in the temperature range of -20 ?? 80℃. Also, the theoretical discussion of the surface morphology with pore-induced shrinkage cracking in the films was presented.