Preparation method of graphene-loaded iron oxide self-assembly mulberry-like structure negative electrode material of lithium-ion battery

A lithium ion battery and iron oxide technology, applied in the field of electrochemistry, can solve the problems of poor conductivity of iron oxide and the like, and achieve the effects of low cost, easy implementation and simple experimental method.

Active Publication Date: 2017-12-08
SHAANXI UNIV OF SCI & TECH
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  • Description
  • Claims
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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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  • Preparation method of graphene-loaded iron oxide self-assembly mulberry-like structure negative electrode material of lithium-ion battery
  • Preparation method of graphene-loaded iron oxide self-assembly mulberry-like structure negative electrode material of lithium-ion battery
  • Preparation method of graphene-loaded iron oxide self-assembly mulberry-like structure negative electrode material of lithium-ion battery

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Experimental program
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Embodiment 1

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

[0023] 2) Add analytically pure soluble iron salt ferrous chloride to 25 mL of 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 above-prepared mixed solution B into a homogeneous hydrothermal reactor, the filling degree is 30%, then seal the reactor, put it into a homogeneous hydrothermal reactor, and carry out a hydrothermal reaction at 50 ° C for 10 min, Natural cooling to room temperature after the reaction finishes to obtain product C;

[0025] 4) product C is washed with water and alcohol for 3 times in a centrifuge, and the centrifugal time is 1min each time, a...

Embodiment 2

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

[0032] 2) Add analytically pure soluble iron salt ferrous chloride to 20 mL of 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 above-prepared mixed solution B into a homogeneous hydrothermal reactor, the filling degree is 80%, then seal the reactor, put it into a homogeneous hydrothermal reactor, and carry out a hydrothermal reaction at 70 ° C for 20min, Natural cooling to room temperature after the reaction finishes to obtain product C;

[0034] 4) product C was washed with water and alcohol for 3 times in a centrifuge, and the centrifugal time was 1min each time...

Embodiment 3

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

[0038] 2) Add analytically pure soluble iron salt ferrous chloride into 15 mL of 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 above-prepared mixed solution B into a homogeneous hydrothermal reactor, the filling degree is 60%, then seal the reactor, put it into a homogeneous hydrothermal reactor and carry out a hydrothermal reaction at 150 ° C for 30min, Natural cooling to room temperature after the reaction finishes 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, ...

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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 preparation method of a graphene-supported iron oxide self-assembled mulberry 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 lithium-ion battery materials that can be applied to electric vehicles, large-scale energy storage devices, it is a key factor to be able to find an anode material with excellent electrochemical performance. Iron oxide (Fe 2 O 3 , FeOOH, etc.) is a very potential lithium ion anode material, with high capacity, low cost, wide source, non-toxic and other advantages, but like most oxide electrodes, iron oxide has poor conductivity, ...

Claims

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Application Information

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Patent Type & Authority Applications(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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