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Sodium ion battery negative electrode material containing nitrogen and carbon coated bimetallic sulfide and preparation method thereof

A technology of sodium ion battery and negative electrode material, which is applied to battery electrodes, active material electrodes, negative electrodes, etc., to achieve the effects of simple preparation method, improved electrical conductivity, and improved electrochemical performance

Inactive Publication Date: 2018-07-10
HUBEI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, there is no technology that can effectively combine the above two methods to prepare high-efficiency sodium-ion battery negative electrode materials

Method used

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  • Sodium ion battery negative electrode material containing nitrogen and carbon coated bimetallic sulfide and preparation method thereof
  • Sodium ion battery negative electrode material containing nitrogen and carbon coated bimetallic sulfide and preparation method thereof
  • Sodium ion battery negative electrode material containing nitrogen and carbon coated bimetallic sulfide and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0031] A preparation method of a nitrogen-containing carbon-coated bimetallic sulfide sodium ion battery negative electrode material:

[0032] Take 100mg of MnFePB in 100mL of distilled water and ultrasonically disperse for 20min, then add 0.25mL of pyrrole, and stir magnetically for 20min in ice bath. Slowly drop 100mL of 0.04M ammonium persulfate solution into it, about 2h to finish. Keep stirring under the ice bath, continue the reaction for 6h to complete the polymerization. After suction filtration with a suction filter pump, dry in a vacuum oven at 60°C for 24 hours to obtain polypyrrole-coated MnFePB. The obtained polypyrrole-coated MnFePB and thiourea were placed in an aluminum oxide cauldron at a mass ratio of 1:2, mixed evenly, and heated from room temperature to 500 °C at a rate of 1 °C / min under an argon atmosphere. , insulation 2h, that is.

Embodiment 2

[0034] A preparation method of a nitrogen-containing carbon-coated bimetallic sulfide sodium ion battery negative electrode material:

[0035] Take 100mg of MnFePB and ultrasonically disperse in 100mL of distilled water for 20min, then add 0.5mL of pyrrole, and stir magnetically for 20min in ice bath. Slowly drop 100mL of 0.04M ammonium persulfate solution into it, about 2h to finish. Keep stirring under the ice bath, continue the reaction for 6h to complete the polymerization. After suction filtration with a suction filter pump, dry in a vacuum oven at 60°C for 24 hours to obtain polypyrrole-coated MnFePB. The obtained polypyrrole-coated MnFePB and thiourea were placed in an aluminum oxide cauldron at a mass ratio of 1:2, mixed evenly, and heated from room temperature to 500 °C at a rate of 1 °C / min under an argon atmosphere. , insulation 2h, that is.

Embodiment 3

[0037] A preparation method of a nitrogen-containing carbon-coated bimetallic sulfide sodium ion battery negative electrode material:

[0038]Take 100mg of MnFePB and ultrasonically disperse in 100mL of distilled water for 20min, then add 1mL of pyrrole, and stir magnetically for 20min in ice bath. Slowly drop 100mL of 0.04M ammonium persulfate solution into it, about 2h to finish. Keep stirring under the ice bath, continue the reaction for 6h to complete the polymerization. After suction filtration with a suction filter pump, dry in a vacuum oven at 60°C for 24 hours to obtain polypyrrole-coated MnFePB. The obtained polypyrrole-coated MnFePB and thiourea were placed in an aluminum oxide cauldron at a mass ratio of 1:2, mixed evenly, and heated from room temperature to 500 °C at a rate of 1 °C / min under an argon atmosphere. , insulation 2h, that is.

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Abstract

The invention relates to a sodium ion battery negative electrode material containing nitrogen and carbon coated bimetallic sulfide and a preparation method thereof. The preparation method provided bythe invention comprises the steps: firstly, the surface of a bimetallic Prussian blue complex is coated with a nitrogen-containing polymer by an in-situ polymerization method, and then the product isnitrided, carbonized and vulcanized through one-step high temperature annealing. The method has the beneficial effects that the bimetallic Prussian blue complex is coated with nitrogen and carbon, anda bimetallic ion hybrid structure is retained, so that two metal sulfides are formed in the subsequent vulcanization process, and the electrochemical performance of the negative electrode material can be improved by the synergistic action of the two metal sulfides; nitrogen and carbon elements are effectively introduced into the negative electrode material, on one hand, the coated nitrogen and carbon can improve the electrical conductivity of the negative electrode material; on the other end, volume expansion of the negative electrode material in a sodium disembedding process is buffered. Inconclusion, the invention provides the high-performance sodium ion battery negative electrode material.

Description

technical field [0001] The invention belongs to the field of preparation of electrode materials for sodium ion batteries, and in particular relates to a nitrogen-containing carbon-coated bimetallic sulfide sodium ion battery negative electrode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries have been widely used in energy storage devices such as mobile phones, computers, smart grids, and electric vehicles due to their long cycle life and high energy density. However, the higher cost (Li 2 CO 3 About 5000$ / t) limits the further application of lithium-ion batteries. Sodium, as an alkali metal, exhibits electrochemical properties similar to lithium. Moreover, the sodium source is abundant and the cost is low (Na 2 CO 3 The price is about Li 2 CO 3 One-twelfth of the price), so in recent years, long-cycle and safe and effective sodium-ion batteries have been gradually developed to meet the increasing demand for large-scale en...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/054
CPCH01M4/366H01M4/5815H01M4/625H01M4/628H01M10/054H01M2004/027Y02E60/10
Inventor 潘佩冯传启丁瑜王锋
Owner HUBEI UNIV
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