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Preparation method of manganese oxide/graphene nano-composite material, lithium ion battery negative electrode and lithium ion battery

A technology of nanocomposite materials and lithium-ion batteries, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as poor cycle stability, achieve stable performance, improve battery performance, and small diameter

Active Publication Date: 2016-12-21
ANHUI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Aiming at technical problems such as poor cycle stability of manganese oxide as an electrode material, the present invention provides a composite material preparation method with simple process, high yield and low cost

Method used

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  • Preparation method of manganese oxide/graphene nano-composite material, lithium ion battery negative electrode and lithium ion battery
  • Preparation method of manganese oxide/graphene nano-composite material, lithium ion battery negative electrode and lithium ion battery
  • Preparation method of manganese oxide/graphene nano-composite material, lithium ion battery negative electrode and lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0040] 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.

[0041] Hydrothermal process: Dissolve 70mg graphene oxide in 80mL deionized water, add 9mL concentrated sulfuric acid (ρ=1.84g / cm 3 ), ultrasonically dispersed for 4 hours, and then the solution was transferred to a reaction kettle, and reacted at a constant temperature of 200 ° C for 20 hours to obtain three-dimensional column...

Embodiment 2

[0045] The preparation method of graphite oxide is with embodiment 1.

[0046] Hydrothermal process: Dissolve 90mg of graphene oxide in 80mL of deionized water, add 6mL of concentrated sulfuric acid, ultrasonically disperse for 3 hours, then transfer it to a reaction kettle, and react at a constant temperature of 160°C for 30 hours to obtain three-dimensional columnar reduced graphene oxide. Wash collection.

[0047] Composite process: Dissolve 0.3g of potassium permanganate in water, add 18mg of three-dimensional columnar reduced graphene oxide into the above hydrothermal solution, soak at 15°C for 1 day, then transfer it to a reaction kettle, and react at a constant temperature of 220°C for 18 hours, the product was washed, dried under vacuum at 40° C. for 11 hours, and the product was collected.

[0048] Roasting process: take the product and roast it at a constant temperature of 500°C for 2 hours under a reducing atmosphere (95% argon and 5% hydrogen), then cool it down t...

Embodiment 3

[0050] The preparation method of graphite oxide is with embodiment 1.

[0051] Hydrothermal process: Dissolve 110mg of graphene oxide in 80mL of deionized water, add 12mL of concentrated sulfuric acid, ultrasonically disperse it for 2 hours, then transfer it to a reaction kettle, and react at a constant temperature of 260°C for 18 hours to obtain a three-dimensional columnar reduced graphene oxide. Wash collection.

[0052] Composite process: Dissolve 0.04g of manganese chloride in water, add 22mg of three-dimensional columnar reduced graphene oxide to the above hydrothermal solution, soak at 30°C for 3 days, then transfer it to a reaction kettle, and react at a constant temperature of 160°C for 30 hours , the product was washed, dried in vacuum at 60° C. for 7 hours, and the product was collected.

[0053] Roasting process: the product is roasted at 300° C. for 3 hours under a reducing atmosphere (95% argon and 5% hydrogen), cooled naturally to room temperature, and the comp...

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Abstract

The invention discloses a preparation method of a manganese oxide / graphene nano-composite material, a lithium ion battery negative electrode and a lithium ion battery. The preparation method comprises the steps of: a hydrothermal process, a compounding process and a roasting process. The preparation method provided by the invention enables direct in-situ growth of hydroxyl manganese oxide on a graphene surface, hydroxyl manganese oxide is compounded on graphene to form a three-dimensional reduced graphene oxide composite material with unique appearance and large specific surface area, and after washing, drying and roasting, a colorless linear manganese oxide and three-dimensional reduced graphene oxide composite material can be obtained. The material solves the agglomeration problem of three-dimensional reduced graphene oxide and manganese oxide nanowire, and well solves the poor stability, poor electrical conductivity and other shortcomings in itself, thus reaching the purpose of enhancing battery performance. The material can be applied to a lithium ion battery negative electrode material, and has the advantages of good cyclic stability and high specific energy density, etc.

Description

technical field [0001] The invention relates to the technical field of inorganic nanomaterials, in particular to a preparation method of a manganese 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] Lithium-ion batteries are mainly composed of positive electrode, negative electrode and electrolyte. In terms of negative electrode materials, the theoretical capacity (372mAh / g) of graphite, the current commercial lithium-ion battery negative electrode material, is low, which limits the improvement of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/62H01M10/0525
CPCH01M4/364H01M4/505H01M4/625H01M10/0525Y02E60/10
Inventor 黄家锐刘小四张文翟慕衡
Owner ANHUI NORMAL UNIV
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