Foamy copper potassium ion battery material and preparation method thereof

A battery material and foamed copper technology, which is applied in the field of electrochemistry, can solve the problems of hindering the contact and infiltration of active materials and electrolytes, affecting the effective occurrence of cobalt sulfide conversion reaction, and the inability of the electrochemical reaction to react completely. The experimental conditions are easy to achieve, Excellent electrochemical performance and the effect of improving cycle stability

Pending Publication Date: 2021-08-03
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation of cobalt sulfide electrode materials is usually through the coating method. In this process, the capacity contribution of cobalt sulfide itself is often affected by the addition of binders and conductive agents, and the contact and infiltration between the active material and the electrolyte is hindered. make the electrochemical reaction incomplete
In addition, the film coating process is mostly done manually, there are certain operational errors, and it is difficult to repeat the same experimental steps
[0003] In summary, the preparation process of battery materials in the prior art requires the addition of conductive agents, binders and other substances, and cobalt sulfide has problems such as volume expansion and serious pulverization, which affect the cobalt sulfide during charging and discharging. The effective occurrence of the conversion reaction has caused its capacity fading, unstable cycle stability and poor rate performance as a battery electrode material, which seriously affects its development prospects and applications.

Method used

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  • Foamy copper potassium ion battery material and preparation method thereof
  • Foamy copper potassium ion battery material and preparation method thereof
  • Foamy copper potassium ion battery material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1) Dissolve cobalt sulfate in a mixed solution of 40 mL of absolute ethanol and 10 mL of oleic acid, and magnetically stir at a speed of 600 r / min to form a clear solution A with a cobalt sulfate concentration of 0.02 mol / L;

[0029] 2) Add 0.15 g of thiourea into solution A, and stir at the same speed to obtain uniformly mixed solution B;

[0030] 3) Cut the self-supporting substrate foam copper with a thickness of 1 mm into a foam copper sheet with a size of 3 × 3 cm, and then completely soak the foam copper sheet in acetone and 2mol / L hydrochloric acid solution for 30 minutes respectively to obtain pretreatment The copper foam sheet; the role of pretreatment is to remove the oxides and impurities on the copper foam, to avoid the impact of impurities on the copper foam on the preparation process.

[0031] 4) Transfer the solution B into the hydrothermal reaction kettle, put the pretreated foamed copper sheet into it at the same time, and put it into the homogeneous re...

Embodiment 2

[0037] 1) Dissolve cobalt sulfate in a mixed solution of 43 mL of absolute ethanol and 9 mL of oleic acid, and magnetically stir at a speed of 650 r / min to form a clear solution A with a cobalt sulfate concentration of 0.04 mol / L;

[0038] 2) Add 0.2 g of thiourea to solution A, and stir at the same speed to obtain a uniformly mixed solution B;

[0039] 3) Cut the self-supporting substrate foam copper with a thickness of 1mm into a foam copper sheet with a size of 3 × 3cm, and then completely soak the foam copper sheet in acetone and 2.2mol / L hydrochloric acid solution for 40min respectively, and obtain the preliminary Processed copper foam;

[0040] 4) Transfer the solution B into the hydrothermal reaction kettle, put the pretreated foamed copper sheet at the same time, seal it and carry out the solvothermal reaction in the homogeneous reactor at a speed of 7r / min from room temperature to 130°C After 8.5 hours of reaction, the product was alternately washed with deionized wa...

Embodiment 3

[0042] 1) Dissolve cobalt sulfate in a mixed solution of 40 mL of absolute ethanol and 8 mL of oleic acid, and magnetically stir at a speed of 700 r / min to form a clear solution A with a cobalt sulfate concentration of 0.05 mol / L;

[0043] 2) Add 0.25 g of thiourea into solution A, and stir at the same speed to obtain uniformly mixed solution B;

[0044] 3) Cut the self-supporting substrate foam copper with a thickness of 1mm into a foam copper sheet with a size of 3 × 3cm, and then completely soak the foam copper sheet in acetone and 2.5mol / L hydrochloric acid solution for 50min respectively, and obtain the preformed Processed copper foam;

[0045] 4) Transfer the solution B into the hydrothermal reaction kettle, put the pretreated foam copper sheet at the same time, seal it, and carry out the solvothermal reaction in the homogeneous reactor at a speed of 8r / min from room temperature to 140°C After 9 hours of reaction, the product was alternately washed three times with deio...

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Abstract

The invention discloses a foamy copper potassium ion battery material and a preparation method thereof. The foamy copper potassium ion battery material is used as a secondary battery material in the field of electrochemistry. The method comprises the following steps: 1, dissolving 0.02-0.08 mol / L of cobaltous sulfate in a mixed solution of absolute ethyl alcohol and oleic acid, uniformly stirring, and then adding 0.15-0.45 g of thiourea to prepare a reaction solution; and 2, putting the pretreated foam copper sheet into the reaction solution, heating the reaction solution to 120-150 DEG C, carrying out solvothermal reaction, taking out the foam copper sheet after the reaction is finished, washing, and drying to obtain the foam copper potassium ion battery material. The foamy copper is used as a self-supporting body, has good conductivity and ductility, and is used as a battery negative electrode material, and the three-dimensional network structure of the foamy copper substrate binds the electrode material in the foamy copper substrate, so that the stability of the electrode is maintained, and the cycling stability of the battery is improved. qIn the preparation process of the electrode plate, the film coating process is omitted, a binding agent and a conductive agent are not needed, the technological process is reduced, and meanwhile the cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, in particular to a foam copper potassium ion battery material and a preparation method. Background technique [0002] With the advancement of science and technology, the performance requirements of materials are getting higher and higher, and the performance of traditional single materials can no longer meet the actual needs, which prompts people to study and prepare composite materials composed of multiple phases, so as to achieve the purpose of performance improvement. . Transition metal sulfides tend to have higher theoretical capacities and lower costs. However, the electrokinetics of transition metal sulfides are relatively slow, and often have a large voltage hysteresis, that is, the platform of charge and discharge is inconsistent, which is determined by the reaction mechanism of transition metal sulfides. The preparation of cobalt sulfide electrode materials is usually through ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/58H01M10/054
CPCH01M4/5815H01M4/626H01M4/628H01M10/054H01M2004/027H01M2004/021Y02E60/10
Inventor 黄剑锋何枢薇李嘉胤曹丽云郭玲王羽偲嘉王瑜航
Owner SHAANXI UNIV OF SCI & TECH
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