A kind of negative electrode material and preparation method thereof, lithium battery

A negative electrode material and negative plate technology, applied in the direction of battery electrodes, secondary batteries, secondary battery repair/maintenance, etc., can solve the problems of positive and negative short circuit, explosion, etc., to improve energy density, prevent explosion, avoid positive and negative Effect of Extreme Short Circuit Phenomenon

Active Publication Date: 2022-05-03
柯良节
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a negative electrode material and its preparation method, and a lithium battery, aiming at solving the problem that the existing lithium battery is prone to short-circuit inside the positive and negative electrodes and cause an explosion as the use time increases. The problem

Method used

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  • A kind of negative electrode material and preparation method thereof, lithium battery
  • A kind of negative electrode material and preparation method thereof, lithium battery
  • A kind of negative electrode material and preparation method thereof, lithium battery

Examples

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Embodiment 1

[0050] A preparation method of negative electrode material, it comprises the following steps:

[0051] 1) Mix graphene, nano-silicon and nano-boron at a weight ratio of 1:5:5 to form a mixed material;

[0052] 2), adding water to the mixed material to prepare a mixed solution with a solid content of 5%;

[0053] 3), adding sodium carboxymethyl cellulose to the mixed solution, and mixing to obtain a slurry solution;

[0054] 4) Coating the slurry solution on a lithium substrate and drying to obtain the negative electrode material.

Embodiment 2

[0056] A preparation method of negative electrode material, it comprises the following steps:

[0057] 1) Mix graphene, nano-silicon and nano-boron at a weight ratio of 1:6:7 to form a mixed material;

[0058] 2), adding ethanol to the mixed material to prepare a mixed solution with a solid content of 8%;

[0059] 3) Add water-based polyurethane to the mixed solution, and mix to obtain a slurry solution;

[0060] 4) Coating the slurry solution on a lithium substrate and drying to obtain the negative electrode material.

Embodiment 3

[0062] A preparation method of negative electrode material, it comprises the following steps:

[0063] 1) Mix graphene, nano-silicon and nano-boron in a weight ratio of 1:8:8 to form a mixed material;

[0064] 2), adding propanol to the mixed material to prepare a mixed solution with a solid content of 10%;

[0065] 3) Add epoxy resin to the mixed solution and mix to obtain a slurry solution;

[0066] 4) Coating the slurry solution on a lithium substrate and drying to obtain the negative electrode material.

[0067] In summary, the present invention provides a method for preparing a negative electrode material, by coating a slurry solution on a lithium substrate, and after drying, graphene, nano-silicon and nano-boron are fixed on the surface of the lithium substrate to obtain the negative electrode Material. The negative electrode material prepared by the present invention can effectively improve the energy density of the lithium battery when used as the negative electrode...

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Abstract

The invention discloses a negative electrode material, a preparation method thereof, and a lithium battery. The preparation method of the negative electrode material includes the steps of: mixing graphene, nano-silicon and nano-boron according to a predetermined weight ratio to form a mixed material; adding to the mixed material A solvent is added to the mixed solution to obtain a mixed solution with a solid content of 4-10%; a binder is added to the mixed solution and mixed to obtain a slurry solution; the slurry solution is coated on a lithium substrate, and after drying The negative electrode material is prepared. The negative electrode material prepared by the present invention can be used as the negative plate of the lithium battery to effectively increase the energy density of the lithium battery, and can effectively prevent the growth of lithium crystal columns perpendicular to the negative plate, thereby avoiding the phenomenon of short circuit between the positive and negative electrodes of the lithium battery and preventing the explosion of the lithium battery.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular to a negative electrode material, a preparation method thereof, and a lithium battery. Background technique [0002] With the support of national policies for new energy vehicles, more and more lithium-ion batteries are used to provide power traction for vehicles instead of gasoline. However, due to the barriers of battery technology, safety performance poses a great challenge to the promotion of new energy vehicles. The safety of the battery is mainly reflected in the fact that when the battery encounters extreme conditions (short circuit or over-discharge), a violent reaction occurs inside the battery, and the battery swells rapidly. At this time, the air pressure inside the battery is very high. If the pressure is not released, the battery is extremely prone to Explosion and fire accident. [0003] The negative electrode of existing lithium batteries is usually formed by coating...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): H01M4/36H01M4/587H01M4/62H01M10/0525H01M10/42
CPCY02E60/10
Inventor柯良节伍连彬
Owner柯良节