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Trivalent-nickel-doped nickel-based hydrotalcite nanometer sheet, preparation method thereof, and application of nano-sheet to supercapacitor

A technology of hydrotalcite and trivalent nickel, applied in hybrid capacitor electrodes, nanotechnology for materials and surface science, nanotechnology, etc., can solve the problems of limited application, low specific surface area of ​​catalyst, harsh synthesis conditions, etc., and achieve good results The effects of electrochemical capacity and stability, ease of large-scale production, and mild preparation conditions

Active Publication Date: 2016-03-16
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, capacitor materials mainly focus on transition metals (Ru, Ni, Co, Mn, etc.) Low specific surface area, which in turn affects the utilization efficiency of active materials; in addition, the low conductivity of electrode materials further limits the electron transport rate, resulting in low energy output density
The practical application of these methods is greatly limited due to cumbersome steps, harsh synthesis conditions, and expensive equipment.

Method used

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  • Trivalent-nickel-doped nickel-based hydrotalcite nanometer sheet, preparation method thereof, and application of nano-sheet to supercapacitor
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  • Trivalent-nickel-doped nickel-based hydrotalcite nanometer sheet, preparation method thereof, and application of nano-sheet to supercapacitor

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Experimental program
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Effect test

Embodiment 1

[0032] 1. Preparation of trivalent nickel-doped NiMn-LDH hydrotalcite nanosheets by microemulsion:

[0033] Configure microemulsion: Based on a 100ml three-necked flask, add 50ml of isopropanol, 1.1ml of deionized water, and 1.88g of surfactant sodium lauryl sulfate into the three-necked flask, stir; slowly add 2ml of 1-butanol, Stir until clear. 0.004mol of Ni(NO 3 ) 2 ·6H 2 O was added to the microemulsion prepared above, and after the salt was dissolved, 0.001molMn(NO 3 ) 3 4H 2 O, after dissolving, add 1.2 g of precipitant urea, crystallize and reflux at 100°C for 27 hours.

[0034] 2. After the reaction is completed, the product is suction-filtered, centrifuged and washed 3 times with a mixed solution of deionized water and ethanol with a volume ratio of 1:1, and then washed once with absolute ethanol, and the filter cake is dried in an oven at 60°C for 12 hours. Trivalent nickel-doped NiMn hydrotalcite nanosheets were obtained. The chemical formula of the NiMn hydr...

Embodiment 2

[0038] Trivalent Ni-doped NiTi-LDH hydrotalcite nanosheets prepared by microemulsion:

[0039] 1) Configure microemulsion: Based on a 100ml three-necked flask, add 80ml of isopropanol, 2.0ml of deionized water, and 2.00g of surfactant sodium lauryl sulfate into the three-necked flask, stir; slowly add 1-butanol 1.5ml, stir until clear. 0.008mol of Ni(NO 3 ) 2 ·6H 2 O was added to the microemulsion prepared above, and after the salt was dissolved, TiCl was added in a closed environment. 4 The solution is 0.002mol, and after the smoke disappears, add 1.500g of urea, crystallize and reflux at 130°C for 27h.

[0040] 2) After the reaction is completed, the product is suction-filtered, centrifuged and washed three times with a mixed solution of deionized water and ethanol with a volume ratio of 1:1, and then washed once with absolute ethanol, and the filter cake is dried in an oven at 90°C for 16 hours, namely NiTi hydrotalcite nanosheets doped with trivalent nickel were obtai...

Embodiment 3

[0045] Trivalent Ni-doped NiCo-LDH hydrotalcite nanosheets prepared by microemulsion:

[0046] 1) Configure microemulsion: Based on a 100ml three-necked flask, add 20ml of isopropanol, 0.2ml of deionized water, and 0.48g of surfactant sodium lauryl sulfate into the three-necked flask, stir; slowly add 1-butanol 0.5ml, stir until clear. 0.002mol of Ni(NO 3 ) 2 ·6H 2 O was added to the microemulsion prepared above, and after the salt was dissolved, 0.001mol Co(NO 3 ) 3 ·6H 2 O, after dissolving, add 1.0 g of precipitant urea, crystallize and reflux at 80°C for 48 hours.

[0047] 2) After the reaction is completed, the product is suction-filtered, centrifuged and washed three times with a mixed solution of deionized water and ethanol with a volume ratio of 1:1, and then washed once with absolute ethanol, and the filter cake is dried in an oven at 90°C for 10 hours, namely NiCo hydrotalcite nanosheets doped with trivalent nickel were obtained.

[0048] The chemical formula...

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Abstract

The invention discloses a high-activity trivalent-nickel-metal-doped nanometer nickel-based hydrotalcite material in a nickel-based electrode material, and a preparation method of the nanometer nickel-based hydrotalcite material. A micro-emulsion confined synthetic method is adopted, is mild in preparation condition and easy for industrial massive production when compared with a traditional preparation method, and provides a feasible method and thought for synthesis of a trivalent-nickel material. The synthesized trivalent-nickel-doped hydrotalcite material is remarkably excellent in capacitance with respect to a supercapacitor. The capacitance can reach 2810 F / g (in a condition of a discharge current being 1.5 A / g), and is 28 times as much as the capacitance (being 100F / g) of a trivalent-nickel-free hydrotalcite material. The trivalent-nickel-doped hydrotalcite material still maintains an excellent charging and discharging effect and is superior in stability under a large electric current. A series of supercapacitor electrode materials doped with trivalent nickel is greatly superior to a traditional Ni-based electrode material, is simple in synthetic method, operation, and processes, and is easy for massive production.

Description

technical field [0001] The invention relates to the field of electrode materials for supercapacitors. More specifically, it relates to a nickel-based hydrotalcite nanosheet doped with trivalent nickel and a preparation method thereof. Background technique [0002] With the rapid development of modern portable electrical appliances, people's demand for energy and energy storage capacity are getting higher and higher. Supercapacitors and lithium-ion batteries have been widely used in energy storage systems to meet the current rapid energy demand. Among them, supercapacitors have been widely used in this field because of their high energy storage density, fast charge and discharge rate, and good charge and discharge stability. At present, capacitor materials mainly focus on transition metals (Ru, Ni, Co, Mn, etc.) The low specific surface area affects the utilization efficiency of active materials; in addition, the low conductivity of electrode materials further limits the el...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G51/00B82Y30/00B82Y40/00H01G11/30
CPCY02E60/13
Inventor 张铁锐赵宇飞吴骊珠佟振合
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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