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A kind of core-shell structure fep nanochain and its preparation method and application in battery

A core-shell structure and nano-chain technology, applied in nanotechnology, structural parts, battery electrodes, etc., can solve the problems of low capacity and poor cycle stability of negative electrode materials, and achieve the effects of large specific capacity, stable performance and controllable batches

Active Publication Date: 2022-06-21
ANHUI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Another object of the present invention is to provide a kind of application of core-shell structure FeP nano chain in battery, be used for making lithium ion battery, described core shell structure FeP nano chain makes lithium ion battery negative electrode, overcomes lithium ion battery negative electrode material capacity Low and poor cycle stability and other technical problems

Method used

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  • A kind of core-shell structure fep nanochain and its preparation method and application in battery
  • A kind of core-shell structure fep nanochain and its preparation method and application in battery
  • A kind of core-shell structure fep nanochain and its preparation method and application in battery

Examples

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Effect test

Embodiment 1

[0091] A preparation method of FeP nano-chain with core-shell structure, comprising the following steps:

[0092] 1) Fe 3 O 4 Preparation of nanospheres: the same as that of Comparative Example 1; XRD pattern is as follows Figure 13 ;

[0093] 2) Fe 3 O 4 @SiO 2 Preparation of nanochains: Weigh 0.05 g of Fe prepared in step 1) 3 O 4 The nanospheres were placed in a beaker, and 240 mL of absolute ethanol was added for 3 minutes. Under the condition of mechanical stirring, 30 mL of ammonia water with a mass concentration of 28% was added at a rate of 700 rpm. After stirring for 10 minutes, the adjustment rate was 300 rpm, and 2 mL of silicon was added drop by drop. After stirring the tetraethyl ester for 15 minutes, stop stirring, place two large magnets on the side of the beaker for 100 s, remove the magnets and let stand for 12 hours, and finally wash with deionized water and ethanol alternately, and dry them in a 60°C oven for 12 hours. Its SEM image is as Figure 7...

Embodiment 2

[0098] The application of a core-shell structure FeP nano-chain in a lithium ion battery is specifically used as a negative electrode active material of the lithium ion battery, making the negative electrode of the lithium ion battery, and finally preparing the lithium ion battery.

[0099] The one-dimensional core-shell FeP nanochain prepared in Example 1 was used as the active material, mixed with conductive carbon black and CMC in a ratio of 8:1:1 or 7:2:1, and then magnetically stirred for 10 hours to make it uniform. Disperse in deionized water, apply the prepared slurry on copper foil with an applicator, place it in a vacuum drying oven at 70 °C, dry it for 20 hours and press it with a tablet machine. The cutting machine cuts it into a small circular electrode sheet.

[0100] The prepared electrode sheets were assembled into a button battery in a glove box filled with high-purity argon gas and the water oxygen value was less than or equal to 0.01 ppm. The electrolyte is...

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Abstract

The invention provides a core-shell structure FeP nano chain and its preparation method and application in batteries, ferric oxide nanospheres are connected into nano chains under the action of an external magnetic field and coated with SiO on its surface 2 , and then grow FeOOH flake nanostructure material on its surface, and use ammonia water to dilute the SiO inside 2 Remove the core-shell nanochain structure, and finally convert it into a core-shell FeP nanochain with sodium hypophosphite under calcination. For the problem of large volume structure changes, its core-shell structure can buffer the volume structure changes during the charging and discharging process, and improve the battery cycle capacity and stability.

Description

technical field [0001] The invention belongs to the technical field of negative electrode materials for lithium ion batteries, and in particular relates to a core-shell structure FeP nanochain, a preparation method thereof and application in batteries, which are used as negative electrode materials for lithium ion batteries to make lithium ion batteries. Background technique [0002] In the fast-developing contemporary society, due to the exhaustion of fossil fuels such as coal, oil, and natural gas, and their combustion will also bring a series of environmental problems, so clean energy such as solar energy, wind energy, water energy, nuclear energy, and new electric energy have been obtained. unprecedented development. [0003] Lithium-ion batteries have attracted widespread attention due to their long cycle life, high operating voltage, high energy density, and environmental friendliness. However, the development of traditional lithium-ion battery anode materials such as...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/08H01M4/58H01M10/0525B82Y30/00B82Y40/00
CPCC01B25/08H01M4/5805H01M10/0525B82Y30/00B82Y40/00Y02E60/10
Inventor 刘金云周婷王艳韩阗俐
Owner ANHUI NORMAL UNIV
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