Preparation method for nickel oxide/graphene nanocomposite, negative electrode of lithium ion battery and lithium ion battery

A nanocomposite material and lithium-ion battery technology, applied in battery electrodes, nanotechnology, nanotechnology, etc., can solve the problems of lithium-ion battery performance degradation, unfavorable graphene electronic conductivity, and affecting the cycle stability of graphene negative electrode materials, etc. , to achieve the effect of low requirements for experimental equipment, easy storage, and good cycle performance

Active Publication Date: 2016-12-14
中森联合科技有限公司
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0005] However, graphene also has some problems as a negative electrode material for lithium-ion batteries: the reduced graphene oxide prepared on a large scale still has a lot of residual oxygen-containing functional groups, which is not conducive to the electronic conductivity of graphene, and the decomposition of oxygen-containing functional groups will affect graphite. Cycling stability of olefinic anode materials
In terms of graphene composites, the vast majority of graphene composites reported so far are still simple mixtures of graphene and active materials, and the active materials may be separated from graphene after multiple charge-discharge cycles, leading to performance degradation of lithium-ion batteries.

Method used

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  • Preparation method for nickel oxide/graphene nanocomposite, negative electrode of lithium ion battery and lithium ion battery
  • Preparation method for nickel oxide/graphene nanocomposite, negative electrode of lithium ion battery and lithium ion battery
  • Preparation method for nickel oxide/graphene nanocomposite, negative electrode of lithium ion battery and lithium ion battery

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Experimental program
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Effect test

Embodiment 1

[0039] Preparation of graphite oxide: weigh 5.0g graphite and 3.75g NaNO respectively 3 Put it into a 1L beaker, stir vigorously, slowly add 150mL of concentrated sulfuric acid, stir for 0.5 hours, then slowly add 20g of KMnO 4 , Added in 0.5 hours, and continued to stir for 20 hours, because the viscosity of the reactant increased, the stirring was stopped, and a paste-like purple-red substance was obtained. After standing for 5 days, slowly add 500mL deionized water and 30mLH 2 o 2 At this time, the color of the solution becomes more obvious bright yellow. After the solution is fully reacted, it is centrifuged and washed to obtain graphite oxide.

[0040] Hydrothermal process: Dissolve 70mg graphene oxide in 80mL deionized water, add 11mL concentrated sulfuric acid (ρ=1.84g / cm 3 ), ultrasonically disperse for 3 hours, then transfer it to a reactor, and react at a constant temperature of 200°C for 20 hours to obtain three-dimensional columnar reduced graphene oxide, which ...

Embodiment 2

[0044] The preparation method of graphite oxide is with embodiment 1.

[0045] Hydrothermal process: Dissolve 90mg graphene oxide in 80mL deionized water, add 10mL concentrated sulfuric acid (ρ=1.84g / cm 3 ), ultrasonically disperse for 2 hours, then transfer it to a reactor, and react at a constant temperature of 160°C for 24 hours to obtain a three-dimensional columnar reduced graphene oxide, which is washed and collected.

[0046] Composite process: Dissolve 2.0g of nickel nitrate and 4.0g of hexamethylenetetramine into water, add 18mg of three-dimensional columnar reduced graphene oxide into the above mixed solution, soak at 10°C for 2 days, and then transfer it to the reaction kettle In 160°C constant temperature reaction for 20 hours, the product was washed, vacuum dried at 50°C for 8 hours, and the product was collected.

[0047] Roasting process: take the product and roast it in the air at a constant temperature of 250° C. for 4 hours, cool it down to room temperature ...

Embodiment 3

[0049] The preparation method of graphite oxide is with embodiment 1.

[0050] Hydrothermal process: Dissolve 120mg graphene oxide in 80mL deionized water, add 9mL concentrated sulfuric acid (ρ=1.84g / cm 3 ), ultrasonically dispersed for 4 hours, and then transferred to a reaction kettle, and reacted at a constant temperature of 260 ° C for 20 hours to obtain three-dimensional columnar reduced graphene oxide, which was washed and collected.

[0051] Composite process: Dissolve 0.8g of nickel chloride and 1.4g of hexamethylenetetramine into water, add 24mg of three-dimensional columnar reduced graphene oxide to the above mixed solution, soak at 30°C for 3 days, and then transfer it to the reaction In the kettle, react at a constant temperature of 200°C for 12 hours, wash the product, dry it under vacuum at 60°C for 4 hours, and collect the product.

[0052] Roasting process: take the product and roast it in the air at a constant temperature of 400°C for 2 hours, cool it down to...

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Abstract

The invention discloses a preparation method for a nickel oxide / graphene nanocomposite, a negative electrode of a lithium ion battery and the lithium ion battery. The preparation method comprises the following steps of a hydrothermal process, a compound process and a roasting process. According to the preparation method, nickel hydroxide directly carries out in-situ growth on the surface of graphene, so that a three-dimensional reduced graphene oxide composite with the specific morphology is formed and has a large specific surface area, a black flaky nickel oxide and graphene composite is obtained through washing, drying and roasting, a problem of aggregation of the graphene and the nickel oxide is solved, and the defects of poor stability, poor electrical conductivity and the like of the negative electrode material are well solved, and thus a purpose of improving the performance of the lithium ion battery is realized; the material is applied to the negative electrode material of the lithium ion battery and has the advantages of good cycling stability, high specific energy density and the like.

Description

technical field [0001] The invention relates to the technical field of inorganic nanomaterials, in particular to a preparation method of a nickel oxide / graphene nanocomposite material, a negative electrode of a lithium ion battery, and a lithium ion battery. Background technique [0002] At present, the problem of energy failure is becoming more and more serious, and it is urgent to find suitable energy storage tools. Lithium-ion batteries are a new type of electric energy storage technology developed after the 1970s. Because of their large capacity and high operating voltage, they have been widely used in military affairs. and civilian small electrical appliances. [0003] At present, the theoretical capacity (372mAh / g) of commercial lithium-ion battery anode material graphite is low, which limits the improvement of the electrochemical performance of lithium-ion batteries, and because nickel oxide is a kind of material with good redox performance and large theoretical speci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/52H01M4/583H01M4/62H01M10/0525H01M4/1393H01M4/1391C01B31/04B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/1391H01M4/1393H01M4/523H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 黄家锐刘小四谷翠萍高绿绿
Owner 中森联合科技有限公司
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