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Preparation method for cobaltosic oxide-graphene composite material and preparation method for lithium ion battery

A technology of tricobalt tetroxide and lithium-ion batteries, which is applied in the manufacture of electrolyte batteries, battery electrodes, non-aqueous electrolyte batteries, etc., can solve the problems of poor rate characteristics and cycle performance, and achieve the effect of improving cycle performance and rate characteristics

Inactive Publication Date: 2014-03-12
OCEANS KING LIGHTING SCI&TECH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, as an anode material, cobalt tetraoxide has poor rate characteristics and cycle performance.

Method used

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  • Preparation method for cobaltosic oxide-graphene composite material and preparation method for lithium ion battery
  • Preparation method for cobaltosic oxide-graphene composite material and preparation method for lithium ion battery
  • Preparation method for cobaltosic oxide-graphene composite material and preparation method for lithium ion battery

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preparation example Construction

[0030] see figure 1 , the preparation method of the tricobalt tetroxide-graphene composite material of one embodiment, comprises the steps:

[0031] Step S110, preparing graphite oxide.

[0032] Preparation of graphite oxide comprises the following steps:

[0033] Step 1. Add graphite into the mixed acid solution composed of concentrated sulfuric acid and concentrated nitric acid to form a mixed solution, keep the temperature of the mixed solution at -2°C~2°C and stir for 10min~30min.

[0034] Preferably, the purity of graphite is 99.5%. Graphite is a powder with a particle size in the order of microns.

[0035] Preferably, the solid-to-liquid ratio of graphite to concentrated sulfuric acid and concentrated nitric acid is 1g:(85ml~95ml):(24ml~25ml).

[0036] Preferably, the mixed solution is placed in an ice-water bath and stirred for 20 minutes.

[0037] Preferably, the mass concentration of concentrated nitric acid is 98%, and the mass concentration of concentrated nitr...

Embodiment 1

[0076] This embodiment prepares the technological process of tricobalt tetroxide-graphene composite material as follows:

[0077] Graphite→graphite oxide→cobalt hydroxide / graphene oxide→cobalt tetroxide-graphene composite

[0078] (1) Graphite: 99.5% purity;

[0079] (2) Graphite oxide: Weigh 1g of graphite with a purity of 99.5% in (1) and add it to a mixed solution consisting of 90ml of concentrated sulfuric acid (98% by mass fraction) and 25ml of concentrated nitric acid (65% by mass fraction). Stir in an ice-water mixed bath environment for 20 minutes, then slowly add 6g of potassium permanganate to the mixture, stir for 1 hour, then heat the mixture to 85°C and keep it for 30 minutes, then add 92ml of deionized water to continue Keep at 85°C for 30 minutes, finally add 10ml of hydrogen peroxide solution (mass fraction 30%), stir for 10 minutes, filter the mixture with suction, and then wash the solids with 100ml of dilute hydrochloric acid and 150ml of deionized water re...

Embodiment 2

[0083] This embodiment prepares the technological process of tricobalt tetroxide-graphene composite material as follows:

[0084] Graphite→graphite oxide→cobalt hydroxide / graphene oxide→cobalt tetroxide-graphene composite

[0085] (1) Graphite: 99.5% purity;

[0086] (2) Graphite oxide: Weigh 1g of graphite with a purity of 99.5% in (1) and add it to a mixed solution consisting of 90ml of concentrated sulfuric acid (98% by mass fraction) and 25ml of concentrated nitric acid (65% by mass fraction). Stir in an ice-water mixed bath environment for 20 minutes, then slowly add 6g of potassium permanganate to the mixture, stir for 1 hour, then heat the mixture to 85°C and keep it for 30 minutes, then add 92ml of deionized water to continue Keep at 85°C for 30 minutes, finally add 10ml of hydrogen peroxide solution (mass fraction 30%), stir for 10 minutes, filter the mixture with suction, and then wash the solids with 100ml of dilute hydrochloric acid and 150ml of deionized water re...

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Abstract

The invention discloses a preparation method of a cobaltosic oxide-graphene composite material. The preparation method of the composite material comprises steps of adding graphite oxide into water and performing ultrasonic dispersion to obtain a graphene oxide suspension; adding cobaltous hydroxide into the graphene oxide suspension and filtering after ultrasonic dispersion to obtain a mixture of the cobaltous hydroxide and the graphene oxide; under an atmosphere of a protective gas, raising the temperature of the mixture of the cobaltous hydroxide and the graphene oxide to 500-700 DEGC, maintaining the temperature for 0.5-2 h and cooling to obtain the cobaltosic oxide-graphene composite material. The cobaltosic oxide-graphene composite material prepared can enhance the multiplying power and cycling performance of a lithium ion battery using the composite material. The invention also provides a preparation method of the lithium ion battery.

Description

technical field [0001] The invention relates to a preparation method of tricobalt tetroxide-graphene composite material and a preparation method of lithium ion battery. Background technique [0002] At present, lithium-ion batteries are widely used in daily life, but the two most important problems facing the further development of lithium-ion batteries are low energy storage capacity and low safety. At present, the negative electrode material used in commercial lithium-ion batteries is generally graphite, and its theoretical capacity is 372mAh / g, which is relatively low; its energy storage potential platform (0-0.25V vs Li / Li + ) is low, which often leads to the generation of lithium dendrites. When the lithium dendrites are generated to a certain amount, they will pierce the separator, causing a short circuit between the positive and negative electrodes, which will generate a lot of heat, which will cause the entire battery to spontaneously ignite or explode. [0003] Cob...

Claims

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Application Information

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IPC IPC(8): H01M4/52H01M10/058H01M4/1391
CPCY02E60/122H01M4/523H01M4/625H01M10/058Y02E60/10Y02P70/50
Inventor 周明杰钟辉王要兵
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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