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A preparation method of graphene-loaded iron oxide self-assembled mulberry-like structure lithium-ion battery negative electrode material

A technology of lithium-ion batteries and iron oxides, applied in the field of electrochemistry, can solve the problems of poor conductivity of iron oxides, and achieve the effects of low cost, easy implementation, and simple experimental methods

Active Publication Date: 2020-12-22
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a graphene-loaded iron oxide that can effectively solve the problem of poor electrical conductivity of iron oxides through graphene loading, and can also inhibit volume expansion and make the battery structure more stable, thereby improving the cycle stability of the battery. Preparation method of self-assembled mulberry-like structure lithium-ion battery negative electrode material

Method used

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  • A preparation method of graphene-loaded iron oxide self-assembled mulberry-like structure lithium-ion battery negative electrode material
  • A preparation method of graphene-loaded iron oxide self-assembled mulberry-like structure lithium-ion battery negative electrode material
  • A preparation method of graphene-loaded iron oxide self-assembled mulberry-like structure lithium-ion battery negative electrode material

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Experimental program
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Embodiment 1

[0022] 1) Disperse commercially available graphene oxide in 25 mL of ethanol to form a 1 mg / mL solution, and then use a 300W ultrasonic generator to sonicate for 1 hour to form a uniformly dispersed graphene oxide suspension A;

[0023] 2) Add the analytically pure soluble iron salt ferrous chloride into 25mL deionized water, stir to fully dissolve the iron salt, then add it to the suspension A, and configure it into a mixed solution B of iron salt and graphene oxide, wherein The concentration of iron salt is 0.05mol / L;

[0024] 3) Pour the mixed solution B prepared above into a homogeneous hydrothermal reactor with a filling degree of 30%, then seal the reactor, put it into a homogeneous hydrothermal reactor at 50° C. for 10 minutes, Naturally cool to room temperature after the reaction to obtain product C;

[0025] 4) The product C was washed with water and alcohol for 3 times in a centrifuge, each centrifugation time was 1 min, and the centrifugation speed was 3000 rpm, an...

Embodiment 2

[0031] 1) Disperse commercially available graphene oxide in 30 mL of ethanol to form a 2 mg / mL solution, and then use a 300W ultrasonic generator to sonicate for 1 hour to form a uniformly dispersed graphene oxide suspension A;

[0032] 2) Add the analytically pure soluble iron salt ferrous chloride into 20mL deionized water, stir to fully dissolve the iron salt, then add it to the suspension A, and configure it into a mixed solution B of iron salt and graphene oxide, wherein The concentration of iron salt is 0.05mol / L;

[0033] 3) Pour the mixed solution B prepared above into a homogeneous hydrothermal reactor with a filling degree of 80%, then seal the reactor, put it into a homogeneous hydrothermal reactor at 70° C. for 20 minutes, Naturally cool to room temperature after the reaction to obtain product C;

[0034] 4) The product C was washed with water and alcohol for 3 times in a centrifuge, each centrifugation time was 1 min, and the centrifugation speed was 4000 rpm, an...

Embodiment 3

[0037] 1) Disperse commercially available graphene oxide in 35 mL of ethanol to form a 3 mg / mL solution, and then use a 300W ultrasonic generator to ultrasonicate for 3 hours to form a uniformly dispersed graphene oxide suspension A;

[0038] 2) Add the analytically pure soluble iron salt ferrous chloride into 15mL deionized water, stir to fully dissolve the iron salt, then add it to the suspension A, and configure it into a mixed solution B of iron salt and graphene oxide, wherein The concentration of iron salt is 0.5mol / L;

[0039] 3) Pour the mixed solution B prepared above into a homogeneous hydrothermal reactor with a filling degree of 60%, then seal the reactor, put it into a homogeneous hydrothermal reactor at 150° C. for 30 minutes, Naturally cool to room temperature after the reaction to obtain product C;

[0040]4) The product C was washed with water and alcohol for 3 times in a centrifuge, each centrifugation time was 2 minutes, and the centrifugation speed was 500...

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Abstract

The invention discloses a preparation method of a graphene-loaded iron oxide self-assembly mulberry-like structure negative electrode material of a lithium-ion battery. The method comprises the steps of dispersing graphene oxide into ethanol to prepare a suspension A; adding ferrous chloride to deionized water and then mixing with the suspension A to obtain a mixed solution B; pouring the mixed solution B into a heterogeneous hydrothermal reactor for hydrothermal reaction, after the reaction is completed, naturally cooling to a room temperature to obtain a product C; carrying out washing and alcohol washing on the product C separately, dispersing the washed product into water to obtain a product D; and freezing the product D until no liquid exists, and then putting the product D into a freezing dryer to obtain a dried sample, namely the final graphene-loaded iron oxide self-assembly mulberry-like structure negative electrode material of the lithium-ion battery. In-situ growth of iron oxide on the graphene surface is achieved to form a graphene-loaded structure by using coordination of a ferric salt and the graphene oxide; and the preparation method is simple in experimental method, low in cost and easy to implement.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a method for preparing a graphene-loaded iron oxide self-assembled mulberry-like structure lithium-ion 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 oxide (Fe 2 o 3 , FeOOH, etc.) is a very potential lithium-ion negative electrode material, which has the advantages of high capacity, low cost, wide range of sources, and non-toxicity. However, like most oxide electrodes, iron oxides ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/52H01M4/62H01M10/0525
CPCH01M4/362H01M4/523H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 曹丽云马萌齐慧李嘉胤黄剑锋吴桂娟陈文卓姚恺
Owner SHAANXI UNIV OF SCI & TECH
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