Cobweb-like graphene coated beta-FeOOH nano-rod aggregate lithium ion battery negative electrode material preparation method

A graphene-wrapped, lithium-ion battery technology, applied in the field of electrochemistry, can solve problems such as poor conductivity, and achieve the effects of improving conductivity, inhibiting volume expansion, and improving cycle stability.

Active Publication Date: 2018-02-23
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 a lithium-ion battery negative electrode material wrapped in β-FeOOH nanorod aggregates wrapped in spiderweb-shaped graphene, which can effectively solve the problem of poor conductivity of β-FeOOH by wrapping it in graphene, and can also inhibit volume expansion , so that the battery structure is more stable, thereby improving the cycle stability of the battery

Method used

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  • Cobweb-like graphene coated beta-FeOOH nano-rod aggregate lithium ion battery negative electrode material preparation method
  • Cobweb-like graphene coated beta-FeOOH nano-rod aggregate lithium ion battery negative electrode material preparation method
  • Cobweb-like graphene coated beta-FeOOH nano-rod aggregate lithium ion battery negative electrode material preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0018] 1) Disperse commercially available graphene oxide in 25 mL of deionized water to form a solution with a graphene oxide concentration of 1 mg / mL, and then use an ultrasonic generator to form a uniformly dispersed graphene oxide suspension A;

[0019] 2) The analytically pure FeCl 3 ·6H 2 O and NaNO 3 Add it into 25mL deionized water, stir to make it fully dissolve, and then add it to suspension A to form a mixed solution of iron salt and graphene oxide, wherein the concentration of iron salt is 0.05mol / L, and the concentration of sodium salt is 0.05mol / L. 2 / 3 of the salt concentration, and then disperse the mixed solution with an ultrasonic generator to obtain a suspension B;

[0020] 3) Pour the suspension B prepared above into a homogeneous hydrothermal reaction kettle, control the filling degree to 30%, then seal the reaction kettle, and put it into a homogeneous hydrothermal reactor at 50°C for hydrothermal reaction , naturally cooled to room temperature after the...

Embodiment 2

[0027] 1) Disperse commercially available graphene oxide in 30mL deionized water to form a solution with a graphene oxide concentration of 2mg / mL, and then use an ultrasonic generator to form a uniformly dispersed graphene oxide suspension A;

[0028] 2) The analytically pure FeCl 3 ·6H 2 O and NaNO 3 Add it into 20mL deionized water, stir it to fully dissolve, then add it into suspension A, and configure it as a mixed solution of iron salt and graphene oxide, wherein the concentration of iron salt is 0.3mol / L, and the concentration of sodium salt is 0.3mol / L. 2 / 3 of the salt concentration, and then disperse the mixed solution with an ultrasonic generator to obtain a suspension B;

[0029] 3) Pour the suspension B prepared above into a homogeneous hydrothermal reaction kettle, control the filling degree to 80%, then seal the reaction kettle, put it into a homogeneous hydrothermal reactor at 70°C for hydrothermal reaction , naturally cooled to room temperature after the reac...

Embodiment 3

[0033] 1) Disperse commercially available graphene oxide in 35mL deionized water to form a solution with a graphene oxide concentration of 5mg / mL, and then use an ultrasonic generator to form a uniformly dispersed graphene oxide suspension A;

[0034] 2) The analytically pure FeCl 3 ·6H 2 O and NaNO 3 Add it into 15mL deionized water, stir to make it fully dissolve, and then add it to suspension A to form a mixed solution of iron salt and graphene oxide, wherein the concentration of iron salt is 0.5mol / L, and the concentration of sodium salt is 0.5mol / L. 2 / 3 of the salt concentration, and then disperse the mixed solution with an ultrasonic generator to obtain a suspension B;

[0035] 3) Pour the suspension B prepared above into a homogeneous hydrothermal reactor, control the filling degree to 60%, then seal the reactor, put it into a homogeneous hydrothermal reactor at 150°C for hydrothermal reaction , naturally cooled to room temperature after the reaction to obtain produc...

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Abstract

The invention relates to a cobweb-like graphene coated beta-FeOOH nano-rod aggregate lithium ion battery negative electrode material preparation method, which comprises: dispersing graphene oxide in deionized water to obtain a suspension A; adding FeCl3.6H2O and NaNO3 into deionized water, and adding the obtained solution into the suspension A to obtain suspension B; pouring the suspension B intoa homogeneous phase hydrothermal reaction kettle, sealing the reaction kettle, placing the sealed reaction kettle into a homogeneous phase hydrothermal reaction instrument, and carrying out a reactionto obtain a product C; washing the product C respectively with water and alcohol, and dispersing the washed product in water to obtain a product D; and carrying out freeze drying on the product D toobtain the cobweb-like graphene coated beta-FeOOH nano-rod aggregate lithium ion battery negative electrode material. According to the present invention, the performance of beta-FeOOH is improved by compounding the graphene with the special structure, wherein graphene has advantages of good conductivity and large specific surface area, such that the poor conductivity of beta-FeOOH can be effectively solved by coating the beta-FeOOH with the special cobweb-like graphene while the volume expansion can be inhibited to achieve the stable battery structure so as to improve the cycle stability of the battery.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a method for preparing a lithium-ion battery negative electrode material wrapped in spiderweb graphene-wrapped β-FeOOH nanorod aggregates. technical background [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 poor conductivity, and the volume expansion is obvious during charge and discharg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/525H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/525H01M4/625H01M10/0525Y02E60/10
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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