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Electrochemical performance of NixCo1-xMoO4 (0 ≤ x ≤ 1) nanowire anodes for lithium-ion batteries.

Park KS, Seo SD, Shim HW, Kim DW - Nanoscale Res Lett (2012)

Bottom Line: NixCo1-xMoO4 (0 ≤ x ≤ 1) nanowire electrodes for lithium-ion rechargeable batteries have been synthesized via a hydrothermal method, followed by thermal post-annealing at 500°C for 2 h.The reversible capacity of NiMoO4 and Ni0.75Co0.25MoO4 nanowire electrodes was larger (≈520 mA h/g after 20 cycles at a rate of 196 mA/g) than that of the other nanowires.This enhanced electrochemical performance of NixCo1-xMoO4 nanowires with high Ni content was ascribed to their larger surface area and efficient electron transport path facilitated by their one-dimensional nanostructure.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Materials Science and Engineering, Ajou University, Suwon, 443-749, Republic of Korea. dwkim@ajou.ac.kr.

ABSTRACT
NixCo1-xMoO4 (0 ≤ x ≤ 1) nanowire electrodes for lithium-ion rechargeable batteries have been synthesized via a hydrothermal method, followed by thermal post-annealing at 500°C for 2 h. The chemical composition of the nanowires was varied, and their morphological features and crystalline structures were characterized using field-emission scanning electron microscopy and X-ray powder diffraction. The reversible capacity of NiMoO4 and Ni0.75Co0.25MoO4 nanowire electrodes was larger (≈520 mA h/g after 20 cycles at a rate of 196 mA/g) than that of the other nanowires. This enhanced electrochemical performance of NixCo1-xMoO4 nanowires with high Ni content was ascribed to their larger surface area and efficient electron transport path facilitated by their one-dimensional nanostructure.

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Thermal behavior of NixCo1-xMoO4·nH2O nanowires. TG curves for as-prepared NixCo1-xMoO4·nH2O nanowire precursors with various values of x, heating at a rate of 10°C/min in air (by KS Park et al.).
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Figure 2: Thermal behavior of NixCo1-xMoO4·nH2O nanowires. TG curves for as-prepared NixCo1-xMoO4·nH2O nanowire precursors with various values of x, heating at a rate of 10°C/min in air (by KS Park et al.).

Mentions: The dehydration process was investigated using the thermogravimetric [TG] technique; the results of which are shown in Figure 2. The typical TG curves obtained from the NixCo1-xMoO4·nH2O nanowires in the temperature range from 30°C to 800°C showed net weight losses of 7% to 9% for each sample. This weight loss was mainly attributed to the evolution of species related to water molecules, such as reversibly bound water molecules (low temperature), water molecules forming an integral part of the crystal structure of NixCo1-xMoO4·nH2O (medium temperature), and water molecules reversibly bound to the hydrate crystal phase (high temperature) [14,15]. On the basis of the TG results, the post-annealing temperature for all the hydrate samples was 500°C, at which almost all water molecules were removed sufficiently to form NixCo1-xMoO4 nanowires.


Electrochemical performance of NixCo1-xMoO4 (0 ≤ x ≤ 1) nanowire anodes for lithium-ion batteries.

Park KS, Seo SD, Shim HW, Kim DW - Nanoscale Res Lett (2012)

Thermal behavior of NixCo1-xMoO4·nH2O nanowires. TG curves for as-prepared NixCo1-xMoO4·nH2O nanowire precursors with various values of x, heating at a rate of 10°C/min in air (by KS Park et al.).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3278371&req=5

Figure 2: Thermal behavior of NixCo1-xMoO4·nH2O nanowires. TG curves for as-prepared NixCo1-xMoO4·nH2O nanowire precursors with various values of x, heating at a rate of 10°C/min in air (by KS Park et al.).
Mentions: The dehydration process was investigated using the thermogravimetric [TG] technique; the results of which are shown in Figure 2. The typical TG curves obtained from the NixCo1-xMoO4·nH2O nanowires in the temperature range from 30°C to 800°C showed net weight losses of 7% to 9% for each sample. This weight loss was mainly attributed to the evolution of species related to water molecules, such as reversibly bound water molecules (low temperature), water molecules forming an integral part of the crystal structure of NixCo1-xMoO4·nH2O (medium temperature), and water molecules reversibly bound to the hydrate crystal phase (high temperature) [14,15]. On the basis of the TG results, the post-annealing temperature for all the hydrate samples was 500°C, at which almost all water molecules were removed sufficiently to form NixCo1-xMoO4 nanowires.

Bottom Line: NixCo1-xMoO4 (0 ≤ x ≤ 1) nanowire electrodes for lithium-ion rechargeable batteries have been synthesized via a hydrothermal method, followed by thermal post-annealing at 500°C for 2 h.The reversible capacity of NiMoO4 and Ni0.75Co0.25MoO4 nanowire electrodes was larger (≈520 mA h/g after 20 cycles at a rate of 196 mA/g) than that of the other nanowires.This enhanced electrochemical performance of NixCo1-xMoO4 nanowires with high Ni content was ascribed to their larger surface area and efficient electron transport path facilitated by their one-dimensional nanostructure.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Materials Science and Engineering, Ajou University, Suwon, 443-749, Republic of Korea. dwkim@ajou.ac.kr.

ABSTRACT
NixCo1-xMoO4 (0 ≤ x ≤ 1) nanowire electrodes for lithium-ion rechargeable batteries have been synthesized via a hydrothermal method, followed by thermal post-annealing at 500°C for 2 h. The chemical composition of the nanowires was varied, and their morphological features and crystalline structures were characterized using field-emission scanning electron microscopy and X-ray powder diffraction. The reversible capacity of NiMoO4 and Ni0.75Co0.25MoO4 nanowire electrodes was larger (≈520 mA h/g after 20 cycles at a rate of 196 mA/g) than that of the other nanowires. This enhanced electrochemical performance of NixCo1-xMoO4 nanowires with high Ni content was ascribed to their larger surface area and efficient electron transport path facilitated by their one-dimensional nanostructure.

No MeSH data available.


Related in: MedlinePlus