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Preparing method and application of ZnO-Graphene lithium ion battery cathode material

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of rapid attenuation, poor cycle performance, etc., and achieve the effect of improving cycle stability

Inactive Publication Date: 2016-02-17
TIANJIN NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

ZnO has a high theoretical capacity (978mAh / g), but it has shortcomings such as poor cycle performance and rapid attenuation. In order to overcome this shortcoming, we synthesized ZnO-Graphene composites by hydrothermal method. ZnO's high capacity, nano-scale particles and Graphene's good electrical conductivity improves composite performance

Method used

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  • Preparing method and application of ZnO-Graphene lithium ion battery cathode material
  • Preparing method and application of ZnO-Graphene lithium ion battery cathode material
  • Preparing method and application of ZnO-Graphene lithium ion battery cathode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] (1) Preparation of graphite:

[0049] 1) Place 20ml three -mouth bottle in an ice water bath, add 80ml concentrated sulfuric acid, 2g graphite, sodium 1g of nitrate, and stir for 1 hour.Under the condition of maintaining the temperature below 10 ° C, slowly add potassium permanganate to the bottle, stir for 1 hour, and revoke the water bath.Under the condition of maintaining the temperature below 20 ° C, slowly add 6g of potassium permanganate to the bottle, add it to 35 ° C after adding, and stir for 60 minutes;

[0050] 2) Slowly add 90ml distilled water to the bottle, heat up to 80 ° C, and stir for 30 minutes; add 7ml 30%hydrogen peroxide to the solution, distilled 55ml of distilled water, and place it for 12 hours;

[0051] 3) Use 3%dilute hydrochloric acid, rinse the product for the product, centrifugal 3 times, transfer to the 40 ° C oven for 30 minutes, remove it, place it in a dine, and dry at room temperature; get the product.

[0052] (2) ZNO's water heat metho...

Embodiment 2

[0057] (1) Preparation of graphite:

[0058] 1) Place 20ml three -mouth bottle in an ice water bath, add 80ml concentrated sulfuric acid, 2g graphite, sodium 1g of nitrate, and stir for 1 hour.Under the condition of maintaining the temperature below 10 ° C, slowly add potassium permanganate to the bottle, stir for 1 hour, and revoke the water bath.Under the condition of maintaining the temperature below 20 ° C, slowly add 6g of potassium permanganate to the bottle, add it to 35 ° C after adding, and stir for 60 minutes;

[0059] 2) Slowly add 90ml distilled water to the bottle, heat up to 80 ° C, and stir for 30 minutes; add 7ml 30%hydrogen peroxide to the solution, distilled 55ml of distilled water, and place it for 12 hours;

[0060] 3) Use 3%dilute hydrochloric acid, rinse the product for the product, centrifugal 3 times, transfer to the 40 ° C oven for 30 minutes, remove it, place it in a dine, and dry at room temperature; get the product.

[0061] (2) ZNO's water heat metho...

Embodiment 3

[0066] (1) Preparation of graphite:

[0067] 1) Place 20ml three -mouth bottle in an ice water bath, add 80ml concentrated sulfuric acid, 2g graphite, sodium 1g of nitrate, and stir for 1 hour.Under the condition of maintaining the temperature below 10 ° C, slowly add potassium permanganate to the bottle, stir for 1 hour, and revoke the water bath.Under the condition of maintaining the temperature below 20 ° C, slowly add 6g of potassium permanganate to the bottle, add it to 35 ° C after adding, and stir for 60 minutes;

[0068] 2) Slowly add 90ml distilled water to the bottle, heat up to 80 ° C, and stir for 30 minutes; add 7ml 30%hydrogen peroxide to the solution, distilled 55ml of distilled water, and place it for 12 hours;

[0069] 3) Use 3%dilute hydrochloric acid, rinse the product for the product, centrifugal 3 times, transfer to the 40 ° C oven for 30 minutes, remove it, place it in a dine, and dry at room temperature; get the product.

[0070] (2) ZNO's water heat method ...

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Abstract

The invention discloses a preparing method and application of a ZnO-Graphene lithium ion battery cathode material. According to the preparing method, ZnO is embedded into Graphene through a hydrothermal synthesis method, and a ZnO-Graphene compound is obtained. The ZnO-Graphene compound serves as the lithium ion battery cathode material to be assembled into a button cell, and charging and discharging tests are carried out at the electric current density of 40 mA / g. It is shown through results that the initial discharging capacity of ZnO is 1,222.1 mAh / g and is slightly different from the initial discharging capacity (1,299.5 mAh / g) of ZnO-Graphene, the circulation stability of ZnO is very poor, and the discharging capacity is reduced to 109.1 mAh / g at the fifth week. However, the discharging capacity of ZnO-RGO still is stilled maintained at 307.3 mAh / g at the fortieth week and is far higher than that of uncompounded ZnO, and the circulation stability of the ZnO-Graphene electrode material is far higher than that of uncompounded ZnO. The added graphene slows down the capacity fading and the volume effect of the electrode material, and thus the electric conductivity and circulation capacity of the material are improved.

Description

Technical field [0001] The present invention belongs to the field of lithium-ion battery material technology, which mainly involves the preparation method and application of Zno-Graphene lithium-ion battery negative materials. Background technique [0002] At present, with the rapid development of emerging economy, global energy consumption has grown sharply. In order to meet increasing energy demand, secondary batteries, especially lithium ion batteries, are highly expected.As a new type of secondary battery, lithium -ion batteries have the advantages of higher energy, good circulation stability, and green environmental protection, and have a pivotal position in the mobile electronic product market.Electrical materials are the core of lithium ion batteries. Carbon materials are the earliest lithium -ion batteries that are studied and commercialized by people. They are still one of the research priorities in the field of lithium -ion battery materials.Graphene has a special two...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/62H01M10/0525
CPCH01M4/364H01M4/485H01M4/625H01M10/0525Y02E60/10
Inventor 冯艳魏玉珍张宇良杜桂香
Owner TIANJIN NORMAL UNIVERSITY
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