Negative electrode material, preparation method thereof and battery

A technology of negative electrode material and negative electrode sheet, which is applied in the direction of battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor fast charging performance, achieve the effect of improving electrical performance, excellent electrical conductivity, and improving the first Coulombic efficiency

Pending Publication Date: 2022-06-28
EVE ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of this, the embodiment of the present invention provides a negative electrode material, which can effectively improve the fast charging performance of the negative electrode material while increasing the energy density, so as to solve the problem of the fast charging performance of the existing negative electrode materials to a certain extent. bad question

Method used

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  • Negative electrode material, preparation method thereof and battery
  • Negative electrode material, preparation method thereof and battery

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preparation example Construction

[0049] Correspondingly, an embodiment of the present invention also provides a method for preparing a negative electrode material, comprising:

[0050] Step 1, the carbon source is added to deionized water and then placed in a stirring device (such as a magnetic stirrer) to stir evenly to obtain a first suspension, and the obtained first suspension is placed at 0°C for constant temperature ultrasonic dispersion for 2- 3h;

[0051] Step 2, adding polyvinylidene fluoride into the first suspension, the mass ratio of polyvinylidene fluoride and carbon source is 1-2:1, and then stirring until the polyvinylidene fluoride is completely dissolved;

[0052] Step 3, adding the doping element source to the first suspension after adding the polyvinylidene chloride, the mass ratio of the doping element source and the carbon source is 3-5:1, and then stirring for 1-2 h to obtain the second suspension;

[0053] Step 4: Add the silicon source into the second suspension, the mass ratio of th...

Embodiment 1

[0063] A preparation method of a negative electrode material, comprising:

[0064] Step 1, adding graphene oxide into deionized water and then placing it in a magnetic stirrer to stir evenly to obtain a first suspension, and placing the obtained first suspension at 0°C for constant temperature ultrasonic dispersion for 2h;

[0065] Step 2, adding polyvinylidene fluoride to the first suspension, the mass ratio of polyvinylidene fluoride and graphene oxide is 1:1, and then stirring until the polyvinylidene fluoride is completely dissolved;

[0066] Step 3, adding melamine to the first suspension after adding polyvinylidene chloride, the mass ratio of melamine and graphene oxide is 3:1, then stirring for 1h to obtain the second suspension;

[0067] Step 4, adding silicon oxide to the second suspension, the mass ratio of silicon oxide and graphene oxide is 5:1, then stirring for 1h, and then performing ultrasonic treatment for 0.5h under the condition of heating in a water bath to...

Embodiment 2

[0070] A preparation method of a negative electrode material, comprising:

[0071] Step 1, adding graphene oxide into deionized water and then placing it in a magnetic stirrer to stir evenly to obtain a first suspension, and placing the obtained first suspension at 0°C for constant temperature ultrasonic dispersion for 3h;

[0072] In step 2, polyvinylidene fluoride is added to the first suspension, the mass ratio of polyvinylidene fluoride and graphene oxide is 2:1, and then the polyvinylidene fluoride is stirred until the polyvinylidene fluoride is completely dissolved;

[0073] Step 3, adding melamine to the first suspension after adding polyvinylidene chloride, the mass ratio of melamine and graphene oxide is 5:1, then stirring for 2h to obtain the second suspension;

[0074] Step 4, adding silicon oxide into the second suspension, the mass ratio of silicon oxide and graphene oxide is 10:1, then stirring for 0.5-1h, and then performing ultrasonic treatment for 0.5h under t...

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Abstract

The invention relates to a negative electrode material, the negative electrode material comprises a particle with a shell structure, and the particle comprises a core and a coating layer; the material of the core comprises a silicon-based matrix and a first doping element doped in the silicon-based matrix, and the first doping element comprises nitrogen and fluorine; the material of the coating layer comprises a carbon-based matrix and a second doping element doped in the carbon-based matrix, and the second doping element comprises nitrogen and fluorine. The invention also relates to a preparation method of the negative electrode material. The invention also relates to a battery containing the negative electrode material.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of lithium ion batteries, and in particular, to a negative electrode material, a preparation method thereof, and a battery using the negative electrode material. Background technique [0002] Lithium-ion batteries have been widely used in terminal industries such as mobile phones, tablet computers, smart wearables, drones, and electric vehicles. However, the existing lithium-ion batteries have the technical problems of low energy density and long charging time. In order to overcome the technical problems of lithium-ion batteries, the existing technical solutions include: [0003] 1. The fast charging capability of the battery is improved through circuit design. However, although the fast charging capability is improved to a certain extent depending on the circuit design, for example, the fast charging of 80% full in 30 minutes is realized. However, in order to achieve faster chargin...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M4/48H01M4/587H01M4/62H01M10/0525H01M10/054
CPCH01M4/366H01M4/386H01M4/483H01M4/587H01M4/625H01M4/5835H01M4/628H01M10/0525H01M10/054
Inventor 安一鸣林森洪斯凡王理
Owner EVE ENERGY CO LTD
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