Cobalt selenide and carbon composite material for negative electrode of high-performance potassium ion battery, preparation method of cobalt selenide and carbon composite material and matched electrolyte

A carbon composite material and battery negative electrode technology, applied in the field of electrochemistry, can solve the problems of poor shape maintenance, cumbersome steps, and poor cycle stability, so as to improve electrochemical performance, enhance charge transfer, and reduce reaction. The effect of impedance

Active Publication Date: 2020-03-17
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the synthesis process of this material is cumbersome and difficult to prepare, and the morphology of the synthesized precursor carbon-coated Co is not well maintained, and there is a certain aggregation phenomenon.
When using this material to test the electrochemical performance, the cycle stability is poor, at 50mA g -1 The capacity is only 293mAh g after 50 cycles at a certain current density -1 , the capacity retention rate is 45%

Method used

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  • Cobalt selenide and carbon composite material for negative electrode of high-performance potassium ion battery, preparation method of cobalt selenide and carbon composite material and matched electrolyte
  • Cobalt selenide and carbon composite material for negative electrode of high-performance potassium ion battery, preparation method of cobalt selenide and carbon composite material and matched electrolyte
  • Cobalt selenide and carbon composite material for negative electrode of high-performance potassium ion battery, preparation method of cobalt selenide and carbon composite material and matched electrolyte

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Effect test

Embodiment 1

[0049] A method for preparing a cobalt selenide@carbon composite material for a negative electrode of a high-performance potassium ion battery, comprising the following steps:

[0050] Disperse 1.16g cobalt nitrate hexahydrate and 20mg cetyltrimethylammonium bromide in 40mL deionized water to form mixed solution A; disperse 18g 2-methylimidazole in 280mL deionized water to form mixed solution B; The mixed solution A was added to the mixed solution B, stirred and reacted for 20 minutes and then centrifuged, the centrifuged product was washed with ethanol three times, and then vacuum-dried at 80°C for 12 hours to obtain cobalt-based metal organic framework materials Co-MOFs with a cubic structure ; 0.2g of the obtained Co-MOFs is dispersed in a mixed solvent of 20mL ethanol and deionized water (the volume ratio of ethanol and deionized water is 3:7), and 0.23g cetyltrimethylammonium bromide is added , 0.035g resorcinol, 0.091g mass fraction of 25% ammonia and 0.065g mass fractio...

Embodiment 2

[0055] A method for preparing a cobalt selenide@carbon composite material for a negative electrode of a high-performance potassium ion battery, comprising the following steps:

[0056] Disperse 1.16g cobalt nitrate hexahydrate and 20mg cetyltrimethylammonium bromide in 40mL deionized water to form mixed solution A; disperse 18g 2-methylimidazole in 280mL deionized water to form mixed solution B; The mixed solution A was added to the mixed solution B, stirred and reacted for 20 minutes and then centrifuged, the centrifuged product was washed with ethanol three times, and then vacuum-dried at 80°C for 12 hours to obtain cobalt-based metal organic framework materials Co-MOFs with a cubic structure ; 0.2g of the obtained Co-MOFs is dispersed in a mixed solvent of 20mL ethanol and deionized water (the volume ratio of ethanol and deionized water is 3:7), and 0.23g cetyltrimethylammonium bromide is added , 0.035g resorcinol, 0.091g mass fraction of 25% ammonia and 0.065g mass fractio...

Embodiment 3

[0058] A method for preparing a cobalt selenide@carbon composite material for a negative electrode of a high-performance potassium ion battery, comprising the following steps:

[0059] Disperse 1.16g cobalt nitrate hexahydrate and 20mg cetyltrimethylammonium bromide in 40mL deionized water to form mixed solution A; disperse 18g 2-methylimidazole in 280mL deionized water to form mixed solution B; The mixed solution A was added to the mixed solution B, stirred and reacted for 20 minutes and then centrifuged, the centrifuged product was washed with ethanol three times, and then vacuum-dried at 80°C for 12 hours to obtain cobalt-based metal organic framework materials Co-MOFs with a cubic structure ; 0.2g of the obtained Co-MOFs is dispersed in a mixed solvent of 20mL ethanol and deionized water (the volume ratio of ethanol and deionized water is 3:7), and 0.23g cetyltrimethylammonium bromide is added , 0.048g pyrrole, 20mL of 0.1mol / L sodium persulfate solution, stirred for 8h, a...

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Abstract

The invention provides a cobalt selenide and carbon composite material for a negative electrode of a high-performance potassium ion battery, a preparation method of the cobalt selenide and carbon composite material and a matched electrolyte. The mass content of cobalt selenide in the composite material is 50-80%, and the mass content of carbon in the composite material is 20-50%. The microstructure of the cobalt selenide and carbon composite material is that cobalt selenide nanoparticles are uniformly distributed in a carbon skeleton of a cubic block structure, and the carbon skeleton of the cubic block structure is uniformly coated with an additional carbon layer. The invention also provides a preparation method of the composite material and an electrolyte matched with the composite material. The unique cubic carbon skeleton structure of the composite material can enhance charge transfer in the embedding/de-embedding process of potassium ions, and volume change in the discharging/charging process can be buffered to the maximum extent. By optimizing the electrolyte, the cycling stability of the composite material applied to the potassium ion battery is further improved. The preparation method of the cobalt selenide and carbon composite material is simple in synthesis process and easy to operate.

Description

technical field [0001] The invention relates to a high-performance cobalt selenide@carbon composite material for negative electrodes of potassium-ion batteries, its preparation method and matching electrolyte, especially the improvement of its electrochemical performance through optimization of the electrolyte, which belongs to the field of electrochemical technology. Background technique [0002] In the past two decades, with the rapid development of electrochemical energy storage, the market demand for renewable and efficient energy storage devices has increased, and rechargeable lithium-ion batteries currently dominate the electrochemical energy storage market. However, the further application of lithium-ion batteries in the field of large-scale energy storage has been constrained by problems such as high cost, limited reserves (0.0017wt.% of the earth's crust), and uneven distribution of lithium resources. Therefore, it is of great practical significance to explore alter...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/054H01M10/0568H01M10/0569
CPCH01M4/362H01M4/581H01M4/62H01M4/625H01M4/628H01M10/054H01M10/0568H01M10/0569H01M2300/0025H01M2300/0028H01M2300/0037Y02E60/10
Inventor 顾鑫赵学波温盛刘丹丹李良军代鹏程
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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