A lithium-ion battery negative electrode material co(oh)f with hexagonal star structure and preparation method thereof

A technology for lithium ion batteries and negative electrode materials, applied in battery electrodes, negative electrodes, structural parts, etc., can solve problems such as unfavorable large-scale production synthesis, harsh experimental environment requirements, single morphology, etc., and achieve good cycle stability. Beneficial for infiltration and easy operation

Active Publication Date: 2019-03-29
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The morphology of the Co(OH)F material prepared by the above method is relatively simple, all of which are nanorods or nanowires with one-dimensional structure, and the micron-scale hollow structure has not been reported.
In addition, the preparation requires the assistance of a nickel mesh substrate, and the process is cumbersome
Moreover, the preparation process needs to be carried out in an inert atmosphere, which has harsh requirements on the experimental environment and is not conducive to large-scale production and synthesis.

Method used

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  • A lithium-ion battery negative electrode material co(oh)f with hexagonal star structure and preparation method thereof
  • A lithium-ion battery negative electrode material co(oh)f with hexagonal star structure and preparation method thereof
  • A lithium-ion battery negative electrode material co(oh)f with hexagonal star structure and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Step (1): 0.074g NH 4 Dissolve F in 40ml of deionized water, stir evenly, add 1g of polyvinylpyrrolidone, and continue stirring until the solution becomes clear;

[0038] Step (2): 0.291g Co(NO 3 ) 2·6H 2 O was dissolved in 20ml alcohol and stirred evenly;

[0039] Step (3): under stirring conditions, the Co(NO 3 ) 2 ·6H 2 O alcohol solution was added dropwise to the NH in step (1) 4 F and polyvinylpyrrolidone mixed solution;

[0040] Step (4): Place the mixed solution obtained in step (3) in a stainless steel reaction kettle with a polytetrafluoroethylene liner, put it in an oven with a temperature of 200°C, keep it warm for 2 hours, and then cool it naturally to room temperature;

[0041] Step (5): The pink precipitate obtained in step (4) was centrifuged and washed 3 times with ethanol, and dried in a vacuum oven at 80° C. for 4 hours to obtain a lithium-ion battery negative electrode material. As a lithium-ion battery negative electrode material for electro...

Embodiment 2

[0043] Step (1): 0.30g NH 4 Dissolve F in 40ml deionized water, stir well, add 0.5g cetyltrimethylammonium bromide, and continue stirring until the solution is clear;

[0044] Step (2); 0.714g CoCl 2 ·6H 2 O was dissolved in 20ml alcohol and stirred evenly;

[0045] Step (3): under stirring condition, the CoCl in the step (2) 2 ·6H 2 O alcohol solution was added dropwise to the NH in step (1) 4 F and cetyltrimethylammonium bromide mixed solution;

[0046] Step (4): Place the mixed solution obtained in step (3) in a stainless steel reaction kettle with a polytetrafluoroethylene liner, put it in an oven with a temperature of 150° C., keep it warm for 24 hours, and then cool it naturally to room temperature;

[0047] Step (5): The pink precipitate obtained in step (4) was centrifuged and washed 3 times with ethanol, and dried in a vacuum oven at 80° C. for 4 hours to obtain a lithium-ion battery negative electrode material. As a lithium-ion battery negative electrode mater...

Embodiment 3

[0049] Step (1): Dissolve 0.168g of NaF in 40ml of deionized water at room temperature, stir well, add 0.8g of polyethylene glycol, and continue stirring until the solution becomes clear;

[0050] Step (2); 0.374g Co(CH 3 COO) 2 4H 2 O was dissolved in 20ml alcohol and stirred evenly;

[0051] Step (3): under stirring conditions, the Co(CH 3 COO) 2 4H 2 O alcohol solution is added dropwise to the NaF and polyethylene glycol mixed solution in step (1);

[0052] Step (4): Place the mixed solution obtained in step (3) in a stainless steel reaction kettle with a polytetrafluoroethylene liner, put it in an oven with a temperature of 80° C., keep it warm for 48 hours, and then cool it naturally to room temperature;

[0053] Step (5): The pink precipitate obtained in step (4) was centrifuged and washed 3 times with ethanol, and dried in a vacuum oven at 80° C. for 4 hours to obtain a lithium-ion battery negative electrode material. As a lithium-ion battery negative electrode m...

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Abstract

The invention belongs to the fields of electrochemistry and new energy and relates to a lithium ion battery negative electrode material Co(OH)F having a hexagram-shaped structure and a preparation method thereof. The lithium ion battery negative electrode material Co(OH)F is synthesized through a solvothermal method. Through adjustment and control of the synthesis technology, solid and hollow hexagram-shaped structure Co(OH)F materials having different morphologies are obtained. The hollow structure can buffer the volume expansion of the electrode material during the circulation so that good circulation stability is kept. The hollow structure is conducive to infiltration of an electrolyte, increasing of the electrode reaction area and improvement of lithium-ion transmission efficiency. The synthesis method is simple in operation, can be carried out under mild conditions, is environment-friendly, has strong repeatability and a short period and is easy to industrialize.

Description

technical field [0001] The invention belongs to the field of electrochemistry and new energy, and specifically relates to a lithium ion battery negative electrode material Co(OH)F with a hexagonal star structure and a preparation method. technical background [0002] As a kind of energy storage secondary battery with excellent performance and rapid development at present, lithium-ion battery has the advantages of high average output voltage, long cycle life, large specific energy, low self-discharge rate, good safety performance, and no pollution. Energy supply device for electronic technology products. With the continuous advancement of lithium-ion battery technology, its application continues to expand to large-scale power supply fields such as electric vehicles, aerospace, and military equipment. [0003] At present, commercial lithium-ion batteries mainly use carbon materials as negative electrodes, but their low theoretical specific capacity cannot meet the needs of hi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G51/08H01M4/58H01M10/0525
CPCC01G51/08C01P2002/72C01P2004/03C01P2004/30C01P2006/40H01M4/582H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 赵海雷李圆李兆麟滕勇强张赛赛
Owner UNIV OF SCI & TECH BEIJING
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