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Three-dimensional graded carbon-clad NaTi<2>(PO<4>)<3>/C micrometer flower electrode material and preparation method and application thereof

A carbon-coated, micro-flower technology, applied in the fields of nanomaterials and electrochemistry, to achieve the effect of expanding production, strong feasibility and high safety factor

Active Publication Date: 2016-07-27
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, a three-dimensional hierarchical carbon-coated NaTi was synthesized by a simple solvothermal method combined with a high-temperature calcination method. 2 (PO 4 ) 3 / C microflowers and their use as electrode materials for Na-ion batteries have not been reported

Method used

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  • Three-dimensional graded carbon-clad NaTi&lt;2&gt;(PO&lt;4&gt;)&lt;3&gt;/C micrometer flower electrode material and preparation method and application thereof
  • Three-dimensional graded carbon-clad NaTi&lt;2&gt;(PO&lt;4&gt;)&lt;3&gt;/C micrometer flower electrode material and preparation method and application thereof
  • Three-dimensional graded carbon-clad NaTi&lt;2&gt;(PO&lt;4&gt;)&lt;3&gt;/C micrometer flower electrode material and preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0041] Three-dimensional hierarchical carbon-coated NaTi 2 (PO 4 ) 3 The preparation method of / C micron flower, it comprises the steps:

[0042] 1) Add 2 mmol of tetra-n-butyl titanate dropwise to 20 mL of ethylene glycol solution, and stir for 30 minutes to obtain a colorless and transparent solution;

[0043] 2) Weigh 1mmol of NaH 2 PO 4 2H 2 O was dissolved in 10mL deionized water, and was added dropwise to the solution obtained in step 1) and stirred evenly;

[0044] 3) Measure 2mmol of 85% phosphoric acid (H 3 PO 4 ) solution, which is dripped dropwise into the mixed solution obtained in step 2), and stirred evenly;

[0045] 4) Weigh 1 mmol of glucose as a carbon source and dissolve it in 10 mL of deionized water, then dropwise add it to the mixed solution obtained in step 3) and continue to stir for 1 hour to obtain a colorless and transparent solution;

[0046] 5) Transfer the mixed solution obtained in step 4) to a 50mL reaction kettle, react under hydrotherm...

Embodiment 2

[0053] 1) Add 1 mmol of tetra-n-butyl titanate dropwise to 30 mL of ethylene glycol solution, and stir for 30 minutes to obtain a colorless and transparent solution;

[0054] 2) Weigh 0.5mmol of NaH 2 PO 4 2H 2 O was dissolved in 5mL deionized water, and was added dropwise to the solution obtained in step 1) and stirred evenly;

[0055] 3) Measure 1mmol of 85% phosphoric acid (H 3 PO 4 ) solution, which is dripped dropwise into the mixed solution obtained in step 2), and stirred evenly;

[0056] 4) Weigh 0.5 mmol of glucose as a carbon source and dissolve it in 5 mL of deionized water, then dropwise add it to the mixed solution obtained in step 3) and continue to stir for 2 hours to obtain a colorless and transparent solution;

[0057] 5) Transfer the mixed solution obtained in step 4) to a 50mL reactor, react under hydrothermal conditions at 140°C for 24 hours, then cool to room temperature naturally, collect the product and place it in an oven at 120°C for direct drying...

Embodiment 3

[0062] 1) Add 4 mmol of tetra-n-butyl titanate dropwise to 40 mL of ethylene glycol solution, and stir for 30 minutes to obtain a colorless and transparent solution;

[0063] 2) Weigh 2mmol of NaH 2 PO 4 2H 2 O was dissolved in 10mL deionized water, and was added dropwise to the solution obtained in step 1) and stirred evenly;

[0064] 3) Measure 4mmol of 85% phosphoric acid (H 3 PO 4 ) solution, which is dripped dropwise into the mixed solution obtained in step 2), and stirred evenly;

[0065] 4) Weigh 3 mmol of glucose as a carbon source and dissolve it in 5 mL of deionized water, then dropwise add it to the mixed solution obtained in step 3) and continue to stir for 4 hours to obtain a colorless and transparent solution;

[0066] 5) Transfer the mixed solution obtained in step 4) to a 50mL reactor, react under hydrothermal conditions at 160°C for 15 hours, then cool to room temperature naturally, collect the product and place it in an oven at 120°C for direct drying to...

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Abstract

The invention relates to a three-dimensional graded carbon-clad NaTi<2>(PO<4>)<3> / C micrometer flower electrode material and a preparation method and application thereof. The diameter of the three-dimensional graded carbon-clad NaTi<2>(PO<4>)<3> / C micrometer flower electrode material is 5-10 micrometers, the thickness of a carbon-clad NaTi<2>(PO<4>)<3> / C nanosheet subunit is only 1-5 nanometers, mesopores with pore diameters of 2-30 nanometers are formed in the carbon-clad NaTi<2>(PO<4>)<3> / C nanosheet subunit, the thickness of a surface carbon layer is 2-5 nanometers, and the nanosheet subunits are in over joint to form a three-dimensional conductive network. The three-dimensional graded carbon-clad NaTi<2>(PO<4>)<3> / C micrometer flower electrode material has the advantages that the three-dimensional graded carbon-clad NaTi<2>(PO<4>)<3> / C micrometer flower is prepared by a simple and practical solovothermal method combined with a high-temperature calcination method, and is endowed with excellent high rate performance and stable long-circulation capability when taken as a positive electrode active material of a sodium ion battery. The process is simple, the three-dimensional graded carbon-clad NaTi<2>(PO<4>)<3> / C micrometer flower electrode material is high in practicable and is high in safety coefficient, the requirement on a device is low due to the adoption of the solovothermal method and the calcination processing, production can be expanded, and market promotion is promoted.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials and electrochemistry, in particular to a three-dimensional graded carbon-coated NaTi 2 (PO 4 ) 3 / C micron flower electrode material and its preparation method and application. Background technique [0002] In the face of increasingly serious environmental challenges and resource shortages, vigorously developing renewable and clean energy is a problem that human beings must face and solve. Electrochemical energy storage technology is in line with the development direction of today's energy sources. Among them, lithium-ion batteries have the advantages of high energy density, long cycle life, high working voltage, no memory effect, wide working temperature range, and high safety. They are widely used in various portable electronic devices. equipment, hybrid vehicles, and even pure electric vehicles. This not only greatly increases the demand for lithium resources, but also puts forward hi...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M4/62H01M10/054
CPCH01M4/362H01M4/5825H01M4/583H01M4/625H01M10/054Y02E60/10
Inventor 麦立强徐畅
Owner WUHAN UNIV OF TECH
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