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A carbon-coated nickel cobalt oxide multi-dimensional assembled microsphere negative electrode material and preparation method

A technology of carbon-coated cobalt acid and negative electrode materials, applied in nanotechnology for materials and surface science, battery electrodes, nanotechnology, etc., can solve problems such as poor conductivity and unstable structure, and achieve excellent structural stability The effect of high stability, simple and mild preparation method, and wide source of raw materials

Active Publication Date: 2022-06-07
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] For NiCoO 2 As the defects of poor conductivity and unstable structure of lithium-ion battery negative electrode materials, the present invention provides a carbon-coated nickel cobaltate multi-dimensional assembled microsphere negative electrode material and its preparation method. The material prepared by the present invention has high specific capacity, Excellent electrochemical performance such as long cycle life, simple and mild preparation method, wide source of raw materials, low cost, strong repeatability, and low equipment requirements

Method used

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  • A carbon-coated nickel cobalt oxide multi-dimensional assembled microsphere negative electrode material and preparation method
  • A carbon-coated nickel cobalt oxide multi-dimensional assembled microsphere negative electrode material and preparation method
  • A carbon-coated nickel cobalt oxide multi-dimensional assembled microsphere negative electrode material and preparation method

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Experimental program
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Effect test

Embodiment 1

[0042] (1) 0.22g nickel nitrate hexahydrate and 0.22g cobalt nitrate hexahydrate were stirred and dissolved in a mixed solvent of 45mL isopropanol, 30mL ethylene glycol and 1.5mL deionized water, placed in an oven for 180 °C solvothera reaction for 12h, after cooling, the precipitation was centrifuged and washed, and dried in a blast drying box to obtain a multidimensional flower-like microsphere precursor;

[0043] (2) The resulting 100mg multidimensional flower-like precursor microspheres were dispersed in 50mL, 10mM and pH =8.5 trimethylolamine aminomethane buffer solution, 50mg of dopamine hydrochloride was added and stirred for surface polymerization, and polydopamine-coated multidimensional flower-like microsphere intermediates were obtained after 12h;

[0044] (3) The polydopamine-coated multidimensional flower-like microsphere intermediates are placed in a protective atmosphere of tubular furnace calcination at 450 °C for 3h, and the heating and cooling rate is 3 °C min -1 A...

Embodiment 2

[0046] (1) 0.093g nickel sulfate hexahydrate and 0.062g cobalt sulfate heptahydrate stirred and dissolved in a mixed solvent of 25mL propanol, 30mL ethylene glycol and 1.4mL deionized water, placed in an oven for 200 °C solvothermal reaction for 6h, after cooling, the precipitation was centrifuged and washed, and dried in a blast drying box to obtain a multidimensional flower-like microsphere precursor;

[0047] (2) The resulting 100mg multidimensional flower precursor microspheres were dispersed in 100mL, 5mM and pH = 7.5 trimethylolamine methane buffer solution, 100mg of dopamine hydrochloride was added and stirred for surface polymerization, and polydopamine-coated multidimensional flower-like bead intermediates were obtained after 6h;

[0048] (3) The polydopamine-coated multidimensional flower-like microsphere intermediates are placed in a tube furnace with a protective atmosphere and calcined at a high temperature of 350 °C for 6 h, and the heating and cooling rate is 0.5 °C...

Embodiment 3

[0050] (1) 0.26g nickel chloride hexahydrate and 0.38g cobalt chloride hexahydrate stirred and dissolved in a mixed solvent of 45mL isopropanol, 30mL propanol and 1.9mL deionized water, placed in an oven for 120 °C solvent thermal reaction for 24h, after cooling, the precipitate was centrifuged and washed, and dried in a blast drying box to obtain a multidimensional flower-like microsphere precursor;

[0051] (2) The resulting 100mg multidimensional flower precursor microspheres were dispersed in 25mL, 15mM and pH = 9.5 trimethylaminomethane buffer solution, 25mg of dopamine hydrochloride was added and stirred for surface polymerization, and polydopamine-coated multidimensional flower-like microsphere intermediates were obtained after 24h;

[0052] (3) The polydopamine-coated multidimensional flower-like microsphere intermediates are calcined at a high temperature of 550 °C in a protective atmosphere tube furnace for 1 h, and the heating and cooling rate is 0.5 °C min -1 After coo...

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Abstract

The invention discloses a carbon-coated nickel cobaltate multi-dimensional assembled microsphere negative electrode material and a preparation method, which belong to the technical field of battery electrode material manufacturing. The metal salt is dissolved in a mixed solvent, and a multi-dimensional flower-shaped microsphere precursor is obtained through solvothermal reaction. body; the multidimensional flower-shaped microsphere precursor is dispersed in the buffer solution of dopamine hydrochloride for surface polymerization to obtain the polydopamine-coated multidimensional flower-shaped microsphere intermediate; the multidimensional flower-shaped microsphere intermediate is placed in an inert Calcined at high temperature in a gas tube furnace, the organic precursor inside the material is decomposed and oxidized, and at the same time, the external polydopamine is carbonized to obtain a carbon-coated nickel cobaltate multi-dimensional assembled microsphere material. The material prepared by the invention has excellent lithium storage characteristics such as high specific capacity and long cycle life, the preparation method is simple and mild, the source of raw materials is wide, the cost is low, the reproducibility is strong, the requirement for equipment is low, and it has broad application prospects.

Description

Technical field [0001] The present invention relates to the field of battery electrode material manufacturing technology, specifically to a carbon-coated nickel cobaltate (NiCoO 2 Multi-dimensional assembly of microsphere anode material and preparation method. Background [0002] Modern social economy is developing rapidly, and the ensuing energy crisis and environmental pollution have become major problems facing the world. In the process of development and utilization of a new generation of green renewable energy, lithium-ion batteries have successfully occupied the application market of small energy storage equipment due to their high energy density and small toxicity, and are further improving their application in the field of pure electric vehicles. However, the theoretical capacity of graphite anode used in commercial lithium-ion batteries is low (372mAh g) at present -1 And the magnification performance is poor, not meeting the growing market demand for higher energy / power...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/52H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCH01M4/366H01M4/523H01M4/62H01M4/625H01M10/0525B82Y40/00B82Y30/00Y02E60/10
Inventor 魏巍陈盛
Owner XI AN JIAOTONG UNIV
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