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Preparation method of NaCl-modified graphene net-coated Beta-FeOOH lithium ion battery negative electrode material

A lithium-ion battery, graphene mesh technology, applied in the field of electrochemistry, can solve problems such as poor conductivity, increase active sites, etc., achieve the effects of good conductivity, low cost, and solve poor conductivity

Active Publication Date: 2018-04-13
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 propose a preparation method of NaCl modified graphene net-coated β-FeOOH lithium-ion battery negative electrode material, which can effectively solve the problem of poor conductivity of β-FeOOH by wrapping it with graphene, and can

Method used

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  • Preparation method of NaCl-modified graphene net-coated Beta-FeOOH lithium ion battery negative electrode material
  • Preparation method of NaCl-modified graphene net-coated Beta-FeOOH lithium ion battery negative electrode material
  • Preparation method of NaCl-modified graphene net-coated Beta-FeOOH lithium ion battery negative electrode material

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Embodiment 1

[0023] 1) Disperse commercially available graphene oxide in 40mL deionized water, the concentration of graphene oxide is 1mg / mL, and then use an ultrasonic generator to disperse it to obtain a uniform graphene oxide suspension A;

[0024] 2) The analytically pure FeCl 3 ·6H 2 O and NaCl were added to 10mL deionized water, stirred to fully dissolve, and then added to suspension A to form a mixed solution of iron salt, sodium salt and graphene oxide, wherein the concentration of iron salt was 0.5mol / L , the sodium salt concentration is 2 / 3 of the iron salt concentration, and then the mixed solution is dispersed by an ultrasonic generator to obtain a suspension B;

[0025] 3) Pour the suspension B prepared above into a homogeneous hydrothermal reaction kettle, control the filling degree to 30%, then seal the reaction kettle, put it into a homogeneous hydrothermal reactor at 100°C for hydrothermal reaction , naturally cooled to room temperature after the reaction to obtain produ...

Embodiment 2

[0032] 1) Disperse commercially available graphene oxide in 35mL deionized water, the concentration of graphene oxide is 2mg / mL, and then use an ultrasonic generator to disperse it to obtain a uniform graphene oxide suspension A;

[0033] 2) The analytically pure FeCl 3 .6H 2 O and NaCl were added to 15mL deionized water, stirred to fully dissolve, and then added to suspension A to form a mixed solution of iron salt, sodium salt and graphene oxide, wherein the concentration of iron salt was 0.4mol / L , the sodium salt concentration is 2 / 3 of the iron salt concentration, and then the mixed solution is dispersed by an ultrasonic generator to obtain a suspension B;

[0034] 3) Pour the suspension B prepared above into a homogeneous hydrothermal reactor, control the filling degree to 50%, then seal the reactor, put it into a homogeneous hydrothermal reactor at 120°C for hydrothermal reaction , naturally cooled to room temperature after the reaction to obtain product C;

[0035] ...

Embodiment 3

[0038] 1) Disperse commercially available graphene oxide in 30mL deionized water, the concentration of graphene oxide is 4mg / mL, and then use an ultrasonic generator to disperse it to obtain a uniform graphene oxide suspension A;

[0039] 2) The analytically pure FeCl 3 .6H 2 O and NaCl were added to 20mL deionized water, stirred to fully dissolve, and then added to suspension A to form a mixed solution of iron salt, sodium salt and graphene oxide, wherein the concentration of iron salt was 0.3mol / L , the sodium salt concentration is 2 / 3 of the iron salt concentration, and then the mixed solution is dispersed by an ultrasonic generator to obtain a suspension B;

[0040] 3) Pour the suspension B prepared above into a homogeneous hydrothermal reaction kettle, control the filling degree to 60%, then seal the reaction kettle, put it into a homogeneous hydrothermal reactor at 140°C for hydrothermal reaction , naturally cooled to room temperature after the reaction to obtain produ...

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Abstract

A preparation method of a NaCl-modified graphene net-coated Beta-FeOOH lithium ion battery negative electrode material comprises the steps of dispersing graphene oxide in deionized water to obtain a suspension liquid A; adding analytically-pure FeCl<3>.6H<2>O and NaCl into the deionized water, adding the mixture to the suspension liquid A to obtain a suspension liquid B; pouring the suspension liquid B into a homogeneous-phase hydrothermal reaction kettle for hydrothermal reaction 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 NaCl-modified graphene net-coated Beta-FeOOH lithium ion battery negative electrode material. The performanceof Beta-FeOOH is improved by employing a composite graphene method, and the reason is that the graphene is good in conductivity and has relatively large specific area; by graphene wrapping, the problem of poor conductivity of Beta-FeOOH can be effectively solved, volume expansion also can be prevented, so that the battery structure is more stable; and by adding the NaCl, the grain size of the product can be controlled, the active sites of oxidization-reduction reaction during lithium intercalation and de-intercalation of the FeOOH are increased, so that the capacity and the cycle stability ofthe battery are improved.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a preparation method of a NaCl-modified graphene network-coated β-FeOOH lithium-ion battery negative electrode material. Background technique [0002] Transition metal oxides / hydroxides have become a research hotspot in recent years because of their high specific capacity (>1000mAh / g). The hydroxide FeOOH in the transition metal is a very potential lithium ion negative electrode material, and there are many crystal forms: α, β, γ, etc. Among them, the β-FeOOH anions are arranged in a body-centered cubic (bcc) array, and the structure is not as dense as that of α, γ-FeOOH, which is more conducive to the diffusion of Li+. In addition, the capacity of β-FeOOH is higher or even exceeds that of other iron oxides. However, like most oxide electrodes, β-FeOOH has the disadvantages of poor conductivity and obvious volume expansion during charge and discharge, wh...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/52H01M4/62H01M10/0525B82Y40/00
CPCB82Y40/00H01M4/362H01M4/523H01M4/625H01M4/628H01M10/0525Y02E60/10
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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