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Spherical hollow porous MnO/C composite material and application thereof

A composite material, hollow technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of poor reaction kinetics, poor rate performance, material agglomeration, etc., to achieve excellent cycle stability, excellent rate performance, enhanced Effect of magnification performance

Active Publication Date: 2014-12-03
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in practical applications, manganese monoxide mainly faces two problems: on the one hand, the low conductivity of manganese monoxide leads to poor reaction kinetics, resulting in poor rate performance; on the other hand, manganese monoxide In the process of repeated intercalation and deintercalation of lithium ions, there will often be drastic volume changes, which will cause severe agglomeration and pulverization of the material, resulting in a rapid decline in its capacity.
Although some progress has been made in the research on the modification of manganese monoxide electrode materials, the preparation of high-quality manganese monoxide materials is complicated and costly, which is not conducive to industrial production.
In addition, there are reports both at home and abroad about the preparation method and technology of manganese monoxide and carbon composite materials with spherical hollow porous structure.

Method used

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  • Spherical hollow porous MnO/C composite material and application thereof
  • Spherical hollow porous MnO/C composite material and application thereof
  • Spherical hollow porous MnO/C composite material and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Firstly, 1.58g of potassium permanganate and 1.42g of sodium sulfate were evenly dispersed in 50mL of deionized water, and then 50mL of pretreated Nannochloropsis concentrate was added. After soaking for 1 hour, Nannochloropsis was separated from the solution, washed several times with deionized water, and placed at a temperature of 80 o It is dried in the oven of C to obtain the precursor product. Take 0.5g of the dried precursor powder and place it in a crucible, add 5mL of N,N-dimethylformamide solution containing 0.05g / mL polystyrene, and then place the crucible at a temperature of 500 o In the high-temperature fixed-bed reaction furnace of C, nitrogen with a flow rate of 200 sccm was introduced as a protective gas, and the final product was obtained after 2 hours of reaction, which was a spherical hollow porous MnO / C composite material. figure 1 It is the XRD diffraction pattern of the material, and it can be seen from the standard card that the obtained product i...

Embodiment 2

[0037] Firstly, 4.74g of potassium permanganate and 4.26g of sodium sulfate were evenly dispersed in 80mL of deionized water, and then 20mL of pretreated chlorella concentrate was added. After soaking for 1 hour, the chlorella was separated from the solution, washed several times with deionized water, and placed at a temperature of 80 o The oven of C dries it to obtain the precursor product. Take 1g of the dried precursor powder and place it in a crucible, add 6mL of 0.06g / mL glucose aqueous solution, and then place the crucible at a temperature of 600 o In the high-temperature fixed-bed reaction furnace of C, argon gas with a flow rate of 500 sccm was introduced as a protective gas, and the final product was obtained after 4 hours of reaction, which was a spherical hollow porous MnO / C composite material. The XRD pattern of the composite product is similar to figure 1 , looks like figure 2 , composed like image 3 .

[0038] The prepared spherical hollow porous MnO / C com...

Embodiment 3

[0040] Firstly, 7.9g of potassium permanganate and 7.1g of sodium sulfate were uniformly dispersed in 60mL of deionized water, and then 40mL of pretreated Schizochytrium concentrated solution was added. After soaking for 0.5 hours, the Schizochytrium was separated from the solution, washed several times with deionized water, and placed at a temperature of 80 o The oven of C dries it to obtain the precursor product. Take 2g of the dried precursor powder and place it in a crucible, add 8mL of 0.1g / mL citric acid aqueous solution, and then place the crucible at a temperature of 650 o In the high-temperature fixed-bed reaction furnace of C, nitrogen with a flow rate of 300 sccm was introduced as a protective gas, and the final product was obtained after 6 hours of reaction, which was a spherical hollow porous MnO / C composite material. The XRD pattern of the composite product is similar to figure 1 , looks like figure 2 , composed like image 3 .

[0041] The prepared spheric...

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Abstract

The invention discloses a spherical hollow porous MnO / C composite material and an application thereof. The spherical hollow porous MnO / C composite material is obtained by the following steps: with natural algae cells as a carbon source and a template and with a mixed solution of potassium permanganate and sodium sulfate as a chemical plating solution, uniformly adsorbing manganese dioxide on the surfaces of the natural algae cells through an impregnation method, so as to obtain a natural algae cell precursor adsorbed with the manganese dioxide; adding a solution containing a reducing carbon source to the natural algae cell precursor adsorbed with the manganese dioxide; and reacting the solution containing the reducing carbon source with the natural algae cell precursor adsorbed with the manganese dioxide for 1-6 hours under the protection of chemical inert gases at 400-700 DEG C, so as to obtain the spherical hollow porous MnO / C composite material. According to the invention, the obtained spherical hollow porous MnO / C composite material has the advantages of excellent rate capability and excellent cycling stability and can be widely applied to the fields of high performance lithium ion batteries and the like as a lithium ion battery cathode material.

Description

(1) Technical field [0001] The invention relates to a method for a spherical hollow porous MnO / C composite material and its application as a lithium ion battery negative electrode material. (2) Background technology [0002] As a manganese oxide material, manganese monoxide is rich in sources, low in price, and environmentally friendly, and can be widely used in the field of lithium batteries. In particular, manganese monoxide has a higher theoretical capacity of 756mAh g -1 , lower open circuit voltage (1.032V, vs. Li / Li + ), is an excellent anode material for lithium-ion batteries. However, in practical applications, manganese monoxide mainly faces two problems: on the one hand, the low conductivity of manganese monoxide leads to poor reaction kinetics, resulting in poor rate performance; on the other hand, manganese monoxide In the process of repeated intercalation and deintercalation of lithium ions, drastic volume changes often occur, resulting in severe agglomeratio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/50H01M4/38
CPCY02E60/10
Inventor 夏阳张文魁陶新永黄辉甘永平
Owner ZHEJIANG UNIV OF TECH
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