Method for preparing graphene-ferric oxide-graphene composite structure battery negative electrode material

A graphene composite and battery negative electrode technology, applied in the field of electrochemistry, can solve problems such as unsuitable for large-scale production, harsh conditions, and expensive equipment, and achieve the effect of improving electrochemical performance, improving conductivity, and simple methods

Active Publication Date: 2017-06-13
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the equipment used in this method is expensive, the conditions are harsh, and it is not suitable for large-scale production.

Method used

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  • Method for preparing graphene-ferric oxide-graphene composite structure battery negative electrode material
  • Method for preparing graphene-ferric oxide-graphene composite structure battery negative electrode material
  • Method for preparing graphene-ferric oxide-graphene composite structure battery negative electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 1) Dissolving commercially available graphene oxide in water to form a solution of 1 mg / mL, and ultrasonically ultrasonicating for 1 hour with a power of 300 W by an ultrasonic generator to form a uniformly dispersed suspension of graphene oxide, which is referred to as suspension A;

[0038] 2) Add analytically pure soluble iron salt ammonium ferric oxalate and polyvinylpyrrolidone PVP into deionized water, stir for 10 minutes, fully dissolve the iron salt, and then add it to suspension A to form a mixture of iron salt and graphene oxide Mixed solution B, wherein the concentration of iron salt is 0.05mol / L, the concentration of PVP is 1mg / mL, and the concentration of graphene oxide is 0.5mg / mL;

[0039] 3) Place the mixed solution B prepared above in a water bath, stir and heat to evaporate, the heating temperature is 80°C, the reaction time is 5h, and evaporate until the precursor becomes a paste, denoted as C;

[0040] 4) Put the product C in a muffle furnace, heat a...

Embodiment 2

[0047] 1) Dissolving commercially available graphene oxide in water to form a solution of 5 mg / mL, and ultrasonicating for 3 hours with a power of 300 W by an ultrasonic generator to form a uniformly dispersed suspension of graphene oxide, which is referred to as suspension A;

[0048] 2) Add analytically pure soluble iron salt ammonium ferric citrate and polyvinylpyrrolidone PVP into deionized water, stir for 20 minutes, fully dissolve the iron salt, and then add it to suspension A to form iron salt and graphene oxide The mixed solution B, wherein the concentration of iron salt is 0.5mol / L, the concentration of sucrose is 10mg / mL, and the concentration of graphene oxide is 2.5mg / mL;

[0049] 3) Place the mixed solution B prepared above in a water bath, stir and heat to evaporate, the heating temperature is 98°C, the reaction time is 5h, and evaporate until the precursor is paste-like, denoted as C;

[0050] 4) Put the product C in a muffle furnace, heat at 300°C, and pyrolyze...

Embodiment 3

[0054] 1) Dissolve commercially available graphene oxide in water to form a solution of 2 mg / mL, and use an ultrasonic generator to sonicate for 2 hours at a power of 300 W to form a uniformly dispersed suspension of graphene oxide, which is referred to as suspension A;

[0055] 2) Add the analytically pure soluble iron salt ammonium ferric oxalate and sucrose into deionized water, stir for 10 minutes, fully dissolve the iron salt, and then add it to the suspension A to form a mixed solution B of iron salt and graphene oxide , wherein the concentration of iron salt is 0.1mol / L, the concentration of sucrose is 5mg / mL, and the concentration of graphene oxide is 1mg / mL;

[0056] 3) Place the mixed solution B prepared above in a water bath, stir and heat to evaporate, the heating temperature is 90°C, the reaction time is 8h, and evaporate until the precursor becomes a paste, denoted as C;

[0057] 4) Put the product C in a muffle furnace, heat at 220°C, and pyrolyze for 3 hours to...

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Abstract

The invention discloses a method for preparing a graphene-ferric oxide-graphene composite structure battery negative electrode material. The method comprises the following steps: preparing graphene loaded Fe2O3 through a first-step pyrolysis method; covering a graphene layer on the surface of Fe2O3 through a water bath method; and finally forming a graphene-ferric oxide-graphene sandwich structure. According to the structure, the electrical conductivity and charge and discharge stability of the ferric oxide can be obviously improved. Meanwhile, the equipment used in the method is simple and easy to realize.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a preparation method of a graphene-iron oxide-graphene composite structure battery negative electrode material. Background technique [0002] Due to the advantages of high energy density, long service life, and environmental friendliness, lithium-ion batteries have become a research hotspot in recent years and have been successfully commercialized. In order to develop the next generation of more efficient Li-ion battery materials that can be applied to electric vehicles and large-scale energy storage devices, finding an anode material with excellent electrochemical performance is a key factor. Iron oxides (Fe 2 o 3 ,Fe 3 o 4 ) has the advantages of high capacity (~1000mAh / g), low cost, wide range of sources, and non-toxicity. Compared with the existing graphite electrode (372mAhg -1 ) has significant advantages over However, a single iron oxide has poor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36
CPCH01M4/362H01M4/366Y02E60/10
Inventor 曹丽云齐慧李嘉胤黄剑锋马萌陈文卓程娅伊党欢
Owner SHAANXI UNIV OF SCI & TECH
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