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Nitrogen-doped nickel cobalt oxide nanowire array and preparation method thereof

A nanowire array, nickel-cobalt-oxygen technology, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of poor cycle stability of lithium batteries, inability to insert lithium ions, and reduced capacity , achieve the effect of strong repeatability, easy large-scale production, and improved conductivity

Inactive Publication Date: 2018-02-02
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] There are many ways to prepare NiCo 2 o 4 Nanowire array, but its lithium battery cycle stability is poor, after dozens of cycle tests, the capacity decays seriously
This is because the structure is destroyed due to the stress accumulation caused by lithium ions being intercalated and extracted multiple times, so effective lithium ions cannot be intercalated in the later stage, resulting in a decrease in capacity.
Non-metal doping can relieve stress and improve cycle stability. This strategy has been widely used in other materials, but for NiCo 2 o 4 no report

Method used

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  • Nitrogen-doped nickel cobalt oxide nanowire array and preparation method thereof
  • Nitrogen-doped nickel cobalt oxide nanowire array and preparation method thereof
  • Nitrogen-doped nickel cobalt oxide nanowire array and preparation method thereof

Examples

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Effect test

Embodiment 1

[0023] Step 1: 0.5g cobalt nitrate, 0.5g nickel nitrate, 0.15g ammonium fluoride, and 0.1g urea were mixed and reacted for 10 hours under hydrothermal conditions at 90°C, and nickel-cobalt-oxygen precursor nanowire arrays were grown on 2g nickel foam;

[0024] Step 2: Calcining the nickel-cobalt-oxygen precursor nanowire array at 200°C for 4 hours in an air atmosphere to synthesize NiCo 2 o 4 nanowire arrays;

[0025] Step 3: NiCo 2 o 4 The nanowire array was calcined at 200 °C for 3 h in an ammonia atmosphere, and the NiCo grown on the nickel foam 2 o 4 The nanowire arrays are nitrogen doped.

[0026] Figure 4 It is the charge-discharge curve diagram of the nickel-cobalt-oxygen precursor nanowire array grown on the foamed nickel prepared in Example 1, by Figure 4 It can be seen that at 100mAg -1 Under the current density, the discharge specific capacity reaches 1300mAh g -1 .

Embodiment 2

[0028] Step 1: 0.3g cobalt nitrate, 0.3g nickel nitrate, 0.09g ammonium fluoride, and 0.06g urea were mixed and reacted for 9 hours under hydrothermal conditions of 110°C, and nickel-cobalt-oxygen precursor nanowire arrays were grown on 2g nickel foam;

[0029] Step 2: Calcining the nickel-cobalt-oxygen precursor nanowire array at 300°C for 3 hours in an air atmosphere to synthesize NiCo 2 o 4 nanowire arrays;

[0030] Step 3: NiCo 2 o 4 The nanowire array was calcined at 300°C for 2h in an ammonia atmosphere, and the NiCo grown on nickel foam 2 o 4 The nanowire arrays are nitrogen doped.

Embodiment 3

[0032] Step 1: Mix 0.4g cobalt nitrate, 0.4g nickel nitrate, 0.12g ammonium fluoride, and 0.08g urea for 9.5h under hydrothermal conditions at 120°C, and grow nickel-cobalt oxide precursor nanowire arrays on 2g nickel foam ;

[0033] Step 2: Calcining the nickel-cobalt-oxygen precursor nanowire array at 400°C for 5 hours in an air atmosphere to synthesize NiCo 2 o 4 nanowire arrays;

[0034] Step 3: NiCo 2 o 4 The nanowire array was calcined at 400 °C for 1.5 h in an ammonia atmosphere, and the NiCo grown on the nickel foam 2 o 4 The nanowire arrays are nitrogen doped.

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Abstract

Disclosed are a nitrogen-doped nickel cobalt oxide nanowire array and a preparation method thereof. The preparation method comprises the following steps of performing mixing on cobalt nitrate, nickelnitrate, ammonium fluoride and urea to be subjected to a reaction to enable a nickel cobalt oxide precursor nanowire array to be grown on foamed nickel firstly; next, performing high-temperature calcining on the nickel cobalt oxide precursor nanowire array to synthesize an NiCo<2>O<4> nanowire array; and finally, performing high-temperature calcining on the NiCo<2>O<4> nanowire array and performing nitrogen doping on the NiCo<2>O<4> nanowire array grown on the foamed nickel to prepare the nitrogen-doped NiCo<2>O<4> nanowire array grown on the foamed nickel, so that the conductivity of NiCo<2>O<4> is improved, thereby improving the battery performance; and the preparation method has the characteristics of simple operation, low cost, environment protection and no pollution.

Description

technical field [0001] The invention relates to the technical field of negative electrode materials for lithium ion batteries, in particular to a nitrogen-doped nickel-cobalt-oxygen nanowire array and a preparation method thereof. Background technique [0002] Lithium-ion batteries have been widely used in portable devices due to their high energy density and high output voltage. In order to meet the energy storage requirements of large devices such as electric vehicles, their energy density and specific capacity need to be further improved. Multi-metal oxides have the potential in this regard, because the multi-metal center can provide more redox potential pairs, which is beneficial to improve the battery capacity. In addition, when the multi-element metal oxide is directly grown on the nickel foam, materials such as binder and conductive agent can be saved, and the production cost of the battery can be reduced. [0003] There are many ways to prepare NiCo 2 o 4 Nanowir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/525H01M4/62H01M4/131H01M4/1391H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/131H01M4/1391H01M4/362H01M4/525H01M4/624H01M10/0525Y02E60/10
Inventor 郑鹏曹金花郭守武刘毅张利锋原晓艳王晓飞霍京浩
Owner SHAANXI UNIV OF SCI & TECH
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