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Preparation method and application of lithium-ion battery negative electrode zinc sulfide-graphene composite material

A lithium-ion battery and graphene composite technology, applied in battery electrodes, batteries, negative electrodes, etc., can solve the problems of battery capacity and cycle stability.

Inactive Publication Date: 2017-09-26
TIANJIN NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although graphite has become a commercial lithium-ion battery anode material, and has the advantages of wide source and simplicity, its theoretical capacity is only 372mAh g -1
In the process of repeated deintercalation of lithium ions, the capacity and cycle stability of lithium ion batteries are easily affected by the unstable graphite structure.

Method used

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  • Preparation method and application of lithium-ion battery negative electrode zinc sulfide-graphene composite material
  • Preparation method and application of lithium-ion battery negative electrode zinc sulfide-graphene composite material
  • Preparation method and application of lithium-ion battery negative electrode zinc sulfide-graphene composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] (1) Preparation of graphite oxide (GO)

[0051] 1) Put a 250ml three-neck flask in an ice-water bath, add 80ml of concentrated sulfuric acid, 2g of graphite, and 1g of sodium nitrate in sequence, and stir for 1 hour; while keeping the temperature below 10°C, slowly add 3g of potassium permanganate into the flask , stir for 1 hour, remove the water bath;

[0052] 2) Under the condition of keeping the temperature below 20°C, slowly add 6g of potassium permanganate to the flask, heat to 35°C after the addition, keep stirring for 60 minutes; slowly add 90ml of distilled water to the flask, heat up to 80°C, Insulate and stir for 30 minutes; add 7ml of 30% hydrogen peroxide and 55ml of distilled water to the solution, and let stand for 12 hours;

[0053] 3) Rinse the product with 3% dilute hydrochloric acid and distilled water, centrifuge 3 times, transfer to a 40°C oven for 30 minutes, take it out, place it in a petri dish, and dry it at room temperature;

[0054] (2) Prep...

Embodiment 2

[0059] (1) Preparation of graphite oxide (GO)

[0060] 1) Put a 250ml three-neck flask in an ice-water bath, add 80ml of concentrated sulfuric acid, 2g of graphite, and 1g of sodium nitrate in sequence, and stir for 1 hour; while keeping the temperature below 10°C, slowly add 3g of potassium permanganate into the flask , stir for 1 hour, remove the water bath;

[0061] 2) Under the condition of keeping the temperature below 20°C, slowly add 6g of potassium permanganate to the flask, heat to 35°C after the addition, keep stirring for 60 minutes; slowly add 90ml of distilled water to the flask, heat up to 80°C, Insulate and stir for 30 minutes; add 7ml of 30% hydrogen peroxide and 55ml of distilled water to the solution, and let stand for 12 hours;

[0062] 3) Rinse the product with 3% dilute hydrochloric acid and distilled water, centrifuge 3 times, transfer to a 40°C oven for 30 minutes, take it out, place it in a petri dish, and dry it at room temperature;

[0063] (2) Prep...

Embodiment 3

[0068] (1) Preparation of graphite oxide (GO)

[0069] 1) Put a 250ml three-neck flask in an ice-water bath, add 80ml of concentrated sulfuric acid, 2g of graphite, and 1g of sodium nitrate in sequence, and stir for 1 hour; while keeping the temperature below 10°C, slowly add 3g of potassium permanganate into the flask , stir for 1 hour, remove the water bath;

[0070] 2) Under the condition of keeping the temperature below 20°C, slowly add 6g of potassium permanganate to the flask, heat to 35°C after the addition, keep stirring for 60 minutes; slowly add 90ml of distilled water to the flask, heat up to 80°C, Insulate and stir for 30 minutes; add 7ml of 30% hydrogen peroxide and 55ml of distilled water to the solution, and let stand for 12 hours;

[0071] 3) Rinse the product with 3% dilute hydrochloric acid and distilled water, centrifuge 3 times, transfer to a 40°C oven for 30 minutes, take it out, place it in a petri dish, and dry it at room temperature;

[0072] (2) Prep...

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Abstract

The invention discloses a preparing method for a zinc sulfide-graphene composite material for a lithium ion battery negative electrode and application. The preparing method includes the step that the ZnS-RGO composite material is obtained through in-situ synthesis, centrifugation and drying to serve as the lithium ion battery negative electrode. A button type lithium ion battery is assembled, a charging and discharging performance test is carried out on the ZnS-RGO composite sample electrode under the current density of 40 mA / g, and the charging and discharging performance of the ZnS-RGO composite sample electrode is compared with that of a pure ZnS electrode. The result indicates that the first-time charging and discharging specific capacity and the circulation stability of the ZnS-RGO composite sample electrode are improved. After circulation for 25 weeks, the reversible discharging capacity of the ZnS-RGO composite sample electrode can reach 135.9 times that of the pure ZnS electrode. The discharging specific capacity and the circulation stability of the ZnS-RGO composite sample electrode are improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery materials, and mainly relates to a preparation method and application of a lithium ion battery negative electrode zinc sulfide-graphene composite material. Background technique [0002] With the development of science and technology, lithium-ion batteries have been widely used in portable electronic products and vehicles due to their characteristics of high energy density, good cycle performance, no memory effect and no pollution. With the development of metal lithium secondary batteries, lithium ion batteries have been widely valued. At present, the electrochemical performance of lithium-ion battery anode materials is one of the main factors restricting the development of high-performance lithium-ion batteries. Although graphite has become a commercial lithium-ion battery anode material, and has the advantages of wide source and simplicity, its theoretical capacity is only 372mAh g ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M4/133H01M4/136H01M4/1393H01M4/1397H01M10/0525
CPCH01M4/133H01M4/136H01M4/1393H01M4/1397H01M4/362H01M4/5815H01M4/583H01M10/0525H01M2004/027H01M2220/20H01M2220/30Y02E60/10
Inventor 冯艳张宇良魏玉珍杜桂香
Owner TIANJIN NORMAL UNIVERSITY
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