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High-capacity carbon nanotube composite cobalt sulfide negative electrode material and preparation and application thereof

A carbon nanotube composite and negative electrode material technology, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problem of reducing the reversible capacity and cycle stability of electrode materials, volume expansion of electrode materials, structure collapse and other problems, to achieve the effect of improving reaction kinetics performance, electrochemical performance, and capacity fading

Active Publication Date: 2018-05-01
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the research of many lithium-ion battery cobalt sulfide negative electrode materials, due to the intercalation and extraction of lithium ions, the volume of the electrode material will expand, or even pulverized, leading to the collapse of the structure, and irreversible elemental cobalt will be generated during the charge and discharge process. Thereby reducing the reversible capacity and cycle stability of the electrode material

Method used

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  • High-capacity carbon nanotube composite cobalt sulfide negative electrode material and preparation and application thereof
  • High-capacity carbon nanotube composite cobalt sulfide negative electrode material and preparation and application thereof
  • High-capacity carbon nanotube composite cobalt sulfide negative electrode material and preparation and application thereof

Examples

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Effect test

Embodiment 1

[0050] A method for preparing a high-capacity carbon nanotube composite CoS anode material for lithium-ion batteries includes the following steps:

[0051] 1. Preparation of cobalt sulfide:

[0052] (1) Dissolve 3 g of polyvinylpyrrolidone (PVP) uniformly in 200 mL of absolute ethanol under stirring conditions with a rotation speed of 500 rpm until the solution becomes clear.

[0053] (2) Under stirring conditions at a rotational speed of 600 rpm, 1.28 g of cobalt acetate tetrahydrate (Co(CH 3 COO) 2 ·4H 2 O) Add to the above solution, continue stirring at room temperature for 20 minutes, and let the cobalt acetate be uniformly dispersed and then stand for 48 hours to obtain the cobalt-containing precursor precipitate.

[0054] (3) Centrifuge the precipitated solution in step (2), remove the supernatant and wash with hot ethanol 10 times to obtain a cobalt-containing precursor.

[0055] (4) Put the cobalt-containing precursor obtained in step (3) into an oven at 60° C. and dry for 2 hou...

Embodiment 2

[0069] A method for preparing a high-capacity carbon nanotube composite CoS anode material for lithium-ion batteries includes the following steps:

[0070] 1. Preparation of cobalt sulfide:

[0071] (1) Dissolve 4 g of polyvinylpyrrolidone (PVP) uniformly in 200 mL of absolute ethanol under stirring conditions at 700 rpm, until the solution becomes clear.

[0072] (2) Under the condition of stirring at 500rpm, 1.5g cobalt acetate tetrahydrate (Co(CH 3 COO) 2 ·4H 2 O) Add to the above solution, keep stirring at room temperature for 30 minutes, and let the cobalt acetate be uniformly dispersed and then stand for 40 hours to obtain the cobalt-containing precursor precipitate.

[0073] (3) Centrifuge the precipitated solution in step (2), remove the supernatant, and wash 15 times with hot ethanol to obtain a cobalt-containing precursor.

[0074] (4) Put the cobalt-containing precursor obtained in step (3) into an oven at 80° C. for drying for 2 hours.

[0075] (5) Under the condition of cont...

Embodiment 3

[0085] A method for preparing a high-capacity carbon nanotube composite CoS anode material for lithium-ion batteries includes the following steps:

[0086] 1. Preparation of cobalt sulfide:

[0087] (1) Dissolve 4 g of polyvinylpyrrolidone (PVP) uniformly in 200 mL of absolute ethanol under stirring conditions with a rotation speed of 400 rpm until the solution becomes clear.

[0088] (2) Under the condition of stirring at 700rpm, 1g cobalt acetate tetrahydrate (Co(CH 3 COO) 2 ·4H 2 O) Add to the above solution, continue stirring at room temperature for 30 minutes, and let the cobalt acetate be uniformly dispersed and then stand for 48 hours to obtain the cobalt-containing precursor precipitate.

[0089] (3) Centrifuge the precipitated solution in step (2), remove the supernatant, and wash 15 times with hot ethanol to obtain a cobalt-containing precursor.

[0090] (4) Put the cobalt-containing precursor obtained in step (3) into an oven at 60° C. and dry for 4 hours.

[0091] (5) Under t...

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Abstract

The invention discloses a high-capacity carbon nanotube composite cobalt sulfide negative electrode material and preparation and application thereof, and belongs to the technical field of a lithium ion battery. A rod-shaped cobalt-containing precursor is generated by hydrolysis reaction of crystal water contained in cobalt acetate tetrahydrate and cobalt acetate, the size of the cobalt-containingprecursor is limited to obtain a nanometer rod-shaped precursor under an effect of PVP, TAA reacts with the precursor to generate nanometer rod-shaped cobalt sulfide, the crystallization property of the material can be improved during the subsequent sintering process, the nanometer material of a carbon nanotube is uniformly combined, the reduction of the internal resistance and the electron transmission are facilitated, and the electrochemical performance is greatly improved. A freeze drying technology is used, the problem that the carbon nanotube is easy to agglomerate is effectively prevented, the obtained carbon nanotube composite CoS negative electrode material has high specific capacity, high charge-discharge capacity and high initial coulombic efficiency, and the capacity attenuationsituation can be remarkably improved.

Description

Technical field [0001] The invention belongs to the technical field of lithium ion batteries, and specifically relates to a high-capacity carbon nanotube composite cobalt sulfide negative electrode material and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries have been widely used in many fields because of their high working voltage, high specific capacity, good cycle performance, fast charging, memory effect, and environmental protection. Commercial lithium-ion batteries still use carbon materials as negative electrode materials, but the capacity of this material in actual batteries is relatively low (theoretical capacity is only 372mAh / g), which can no longer meet people's needs. Therefore, the development of anode materials with higher capacity is of great significance to the development of lithium-ion batteries. Due to transition metal sulfides (MoS 2 , FeS, NiS, CoS 2 Etc.) has a very high specific capacity, and more and more...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/362H01M4/5815H01M4/62H01M4/625H01M10/0525Y02E60/10
Inventor 李伟善薛诗达田源源许淑媛简健衡
Owner SOUTH CHINA NORMAL UNIVERSITY
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