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Negative electrode material, negative plate and preparation method of negative plate, lithium-ion battery and preparation method of lithium-ion battery

A technology of negative electrode material and negative electrode active material, applied in electrolyte battery manufacturing, electrode manufacturing, secondary battery and other directions, can solve the problems of electrode capacity decline and failure, and achieve the effect of improving stability, reducing volume expansion and high specific capacity

Inactive Publication Date: 2018-07-20
BEIJING NAT BATTERY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the biggest problem with silicon is that it is accompanied by a huge volume change during charging and discharging, and its volume expansion rate is as high as 270%. The pulverization of silicon causes the active material to peel off, which eventually leads to a significant decrease in the capacity of the electrode or even failure.

Method used

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  • Negative electrode material, negative plate and preparation method of negative plate, lithium-ion battery and preparation method of lithium-ion battery

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preparation example Construction

[0045]According to a third aspect of the present invention, the present invention provides a method for preparing a negative electrode sheet, comprising the steps of:

[0046] The negative electrode material is dissolved in a solvent to form a slurry, and the slurry is coated on the negative electrode current collector and dried to obtain a negative electrode sheet.

[0047] During the preparation process of the traditional negative electrode sheet, after the negative electrode material is coated on the negative electrode current collector, it needs to be rolled after drying to compact the negative electrode material to obtain the negative electrode sheet.

[0048] The solvent is selected from organic solvents and / or water, and the organic solvent is preferably N-methylpyrrolidone.

[0049] In the preparation method of the negative electrode sheet provided by the present invention, the negative electrode material is coated on the negative electrode current collector, and no ro...

Embodiment 1

[0062] This embodiment provides a negative electrode material, including the following components in parts by mass: 93 parts of silicon aluminum, 2 parts of graphite, 2 parts of polyacrylic acid, and 3 parts of styrene-butadiene rubber.

Embodiment 2

[0064] This embodiment provides a negative electrode material, including the following components in parts by mass: 98 parts of silicon magnesium, 0.5 part of graphite, 0.6 part of carboxymethyl cellulose, and 0.9 part of styrene-butadiene rubber.

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Abstract

The invention provides a negative electrode material, a negative plate and a preparation method of the negative plate, a lithium-ion battery and the preparation method of the lithium-ion battery and relates to the technical field of battery materials. The negative electrode material is prepared from the following components in pats by weight: 92-98 parts of a negative electrode active material, 0.5-2 parts of a negative conductive agent and 0.5-5 parts of a negative electrode binder, wherein the negative electrode active material is selected from a silicon-based alloy and / or a silicon-based compound. The technical problems of a high volume expansion ratio and a serious pulverization phenomenon in charge and discharge processes when silicon is taken as the negative electrode active materialin the prior art are solved; volume expansion of the negative electrode material in the charge and discharge processes is reduced and the pulverization phenomenon is inhibited through cooperation ofthe silicon-based alloy and / or the silicon-based compound as the negative electrode active material, the negative conductive agent and the negative electrode binder; and the specific capacity and thecycle performance are significantly improved.

Description

technical field [0001] The invention relates to the technical field of battery materials, in particular to a negative electrode material, a negative electrode sheet and a preparation method thereof, a lithium ion battery and a preparation method thereof. Background technique [0002] Negative electrode material is one of the key materials for manufacturing lithium-ion batteries, and is an important factor determining the performance of lithium-ion batteries. However, the progress of negative electrode materials is still relatively late. The current commercial negative electrode materials are mainly graphite, and its actual capacity is close to the theoretical capacity. Value (372mAh / g), can not meet the needs of high-performance high-capacity lithium-ion batteries. [0003] Silicon is the anode material with the highest theoretical capacity so far, and thus has been extensively studied. However, the biggest problem with silicon is that it is accompanied by a huge volume cha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M4/134H01M4/1395H01M4/04H01M10/0525H01M10/058
CPCH01M4/0404H01M4/134H01M4/1395H01M4/362H01M4/386H01M4/628H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 郭伟李云吴丛笑张景舒栗瑞芹
Owner BEIJING NAT BATTERY TECH