Preparation method of graphene-loaded Alpha-FeOOH sandwiched sheet layer-structure lithium ion battery negative electrode material

A lithium-ion battery and lamellar structure technology, applied in the field of electrochemistry, can solve the problems of poor conductivity, decreased electrode capacity, pulverization and shedding of active materials, etc., and achieve the effects of improving conductivity, stable battery structure, and inhibiting volume expansion.

Inactive Publication Date: 2017-11-24
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, like most oxide electrodes, α-FeOOH has poor conductivity, and the volume expansion is obvious during charging and discharging, which will cause the active material to pulverize and fall off the surface of the current collector, resulting in a sharp drop in electrode capacity.

Method used

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  • Preparation method of graphene-loaded Alpha-FeOOH sandwiched sheet layer-structure lithium ion battery negative electrode material
  • Preparation method of graphene-loaded Alpha-FeOOH sandwiched sheet layer-structure lithium ion battery negative electrode material
  • Preparation method of graphene-loaded Alpha-FeOOH sandwiched sheet layer-structure lithium ion battery negative electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1) Disperse commercially available graphene oxide in 25mL deionized water to form a 1mg / mL solution, and then use a 300W ultrasonic generator to ultrasonically disperse for 1h to form a uniformly dispersed graphene oxide suspension A;

[0025] 2) Add analytically pure soluble iron salt ferric nitrate to 25mL of deionized water, stir to fully dissolve the iron salt, and then add it to suspension A to prepare a mixed solution of iron salt and graphene oxide, in which the iron salt is The concentration is 0.05mol / L, and then the mixed solution is dispersed with a 300W ultrasonic generator for 2h to obtain suspension B;

[0026] 3) Pour the above-prepared suspension B into a homogeneous hydrothermal reaction kettle with a filling degree of 30%, then seal the reaction kettle and put it in a homogeneous hydrothermal reactor for a hydrothermal reaction at 50°C for 5 hours , After the reaction, cool to room temperature naturally to obtain product C;

[0027] 4) Use a centrifuge to wa...

Embodiment 2

[0033] 1) Disperse commercially available graphene oxide in 30mL deionized water to form a 2mg / mL solution, and then use a 300W ultrasonic generator to ultrasonically disperse for 3h to form a uniformly dispersed graphene oxide suspension A;

[0034] 2) Add analytically pure soluble iron salt ferric nitrate to 20mL of deionized water, stir to fully dissolve the iron salt, and then add it to suspension A to prepare a mixed solution of iron salt and graphene oxide. The concentration is 0.3mol / L, and then the mixed solution is dispersed with a 300W ultrasonic generator for 3 hours to obtain suspension B;

[0035] 3) Pour the above-prepared suspension B into a homogeneous hydrothermal reactor with a filling degree of 80%, then seal the reactor and put it in a homogeneous hydrothermal reactor for a hydrothermal reaction at 70°C for 4 hours , After the reaction, cool to room temperature naturally to obtain product C;

[0036] 4) The product C was washed with water and alcohol for 3 times ...

Embodiment 3

[0039] 1) Disperse commercially available graphene oxide in 35mL deionized water to prepare a 5mg / mL solution, and then use a 300W ultrasonic generator to ultrasonically disperse for 2h to form a uniformly dispersed graphene oxide suspension A;

[0040] 2) Add analytically pure soluble iron salt ferric nitrate to 15mL of deionized water, stir to fully dissolve the iron salt, and then add it to suspension A to prepare a mixed solution of iron salt and graphene oxide. The concentration is 0.5mol / L, and then the mixed solution is dispersed with a 300W ultrasonic generator for 4 hours to obtain suspension B;

[0041] 3) Pour the above-prepared suspension B into a homogeneous hydrothermal reactor with a filling degree of 60%, and then seal the reactor, put it in a homogeneous hydrothermal reactor for hydrothermal reaction at 150°C for 3h , After the reaction, cool to room temperature naturally to obtain product C;

[0042] 4) Use a centrifuge to wash product C with water and alcohol for ...

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Abstract

A preparation method of a graphene-loaded Alpha-FeOOH sandwiched sheet layer-structure lithium ion battery negative electrode material comprises the steps of dispersing graphene oxide in deionized water to obtain a suspension liquid A; adding a ferric nitrate salt into the deionized water, and mixing with the suspension liquid A to obtain a suspension liquid B; pouring the suspension liquid B into a homogeneous phase hydrothermal reaction kettle, sealing the reaction kettle, placing the suspension liquid B in a homogeneous phase hydrothermal reaction instrument for hydrothermal reaction and naturally cooling to a room temperature to obtain a product C; respectively washing the product C with water and alcohol, and dispersing the washed product in the water to obtain a product D; and freezing and drying the product D to obtain the sandwiched sheet layer-structure graphene-loaded Alpha-FeOOH compound. Since graphene is good in conductivity and has relatively large specific area, the conductivity of Alpha-FeOOH can be remarkably improved by loading the graphene, the dispersion performance of the Alpha-FeOOH is simultaneously improved, and agglomeration is prevented. An ultrasonic assistant method and a homogeneous phase hydrothermal method are combined, the material conductivity is improved by combining the Alpha-FeOOH and the graphene, the electrochemical performance is improved, so that the battery is more stable in structure, and the cycle stability of the battery is improved.

Description

Technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a preparation method of a graphene-loaded α-FeOOH sandwich sheet structure lithium ion battery negative electrode material. Background technique [0002] α-FeOOH (goethite iron oxyhydroxide) is an important part of iron oxide, due to its high capacity (> 1000mAh / g), abundant natural resources, non-toxicity and low cost, it has long been regarded as a promising candidate for a new generation of negative electrode materials. However, like most oxide electrodes, α-FeOOH has poor conductivity and significant volume expansion during charging and discharging, which in turn causes the active material to be powdered and falls off the surface of the current collector, resulting in a sharp drop in electrode capacity. Zhang Meng et al. (Journal of Alloys and Compounds, 2015, 648, 134-138) use ferric chloride and urea as reactants to react under hydrothermal conditions at ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/52H01M4/583H01M4/62H01M10/0525
CPCH01M4/366H01M4/52H01M4/583H01M4/625H01M10/0525Y02E60/10
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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