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Negative pole piece of lithium ion battery as well as preparation method and application of negative pole piece

A technology of lithium ion battery and negative pole piece, which is applied to battery electrodes, non-aqueous electrolyte battery electrodes, circuits, etc., can solve the problems of difficult processing, difficult to exert advantages, low compaction, etc., to achieve low cost and improve fast charging. Performance, effect of high fast charging target

Pending Publication Date: 2021-12-31
ENVISION DYNAMICS TECH (JIANGSU) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Hard carbon is a kind of amorphous carbon material with large layer spacing, good kinetics, small lithium intercalation strain, and high capacity, but it has the problems of low first effect, low compaction, easy water absorption, and obvious voltage hysteresis.
At present, there have been some reports on mixing graphite and hard carbon to take advantage of the properties of both, but this simple mechanical mixing method cannot fully utilize the advantages of both.
[0003] At present, lithium-ion battery negative electrode materials mainly improve the fast charging performance of graphite by reducing particle size and carbonization coating, but it is difficult to greatly improve the fast charging ability of graphite materials.
As an amorphous carbon material with excellent fast charging performance, hard carbon has problems such as difficult processing, low compaction, voltage lag, and low first effect.
If only mechanical mixing of graphite and hard carbon is used, it is difficult to take advantage of the advantages of both

Method used

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  • Negative pole piece of lithium ion battery as well as preparation method and application of negative pole piece
  • Negative pole piece of lithium ion battery as well as preparation method and application of negative pole piece

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] This embodiment provides a preparation method of lithium ion battery negative electrode material, and the preparation method comprises the following steps:

[0082] (1) 1 part of conductive carbon black and 55 parts of deionized water dissolving 1 part of sodium carboxymethyl cellulose are mixed and stirred at a stirring rate of 800rmp for 10min, and then the powder of 95 parts of artificial graphite is added and stirred at a stirring rate of 800rmp Mix and stir for 30 minutes, add 15 parts of deionized water again for dispersing and stirring at a stirring rate of 2200rmp for 30 minutes, and finally add 1 part of styrene-butadiene rubber for viscosity adjustment and stirring at a stirring rate of 800rmp for 10min, and reverse stirring at a stirring rate of 2200rmp 1min for defoaming treatment to prepare the precursor of the first active material layer;

[0083] (2) 1 part of conductive carbon black and 55 parts of deionized water dissolving 1 part of sodium carboxymethy...

Embodiment 2

[0087] This embodiment provides a preparation method of lithium ion battery negative electrode material, and the preparation method comprises the following steps:

[0088] (1) 0.5 parts of carbon nanotubes and 50 parts of deionized water dissolving 0.5 parts of sodium polyacrylate are mixed and stirred at a stirring rate of 600rmp for 12min, and then 96 parts of natural graphite powder is added for mixing and stirring at a stirring rate of 600rmp for 31min , adding 10 parts of deionized water again for dispersing and stirring at a stirring rate of 2100rmp for 31min, and finally adding 1.5 parts of styrene-butadiene rubber for viscosity adjustment stirring at a stirring rate of 600rmp for 11min, and removing bubble treatment to prepare the precursor of the first active material layer;

[0089] (2) 1.5 parts of graphene and 60 parts of deionized water dissolving 1.5 parts of sodium polyacrylate were mixed and stirred at a stirring rate of 600rmp for 11min, and then 98 parts of n...

Embodiment 3

[0093] This embodiment provides a preparation method of lithium ion battery negative electrode material, and the preparation method comprises the following steps:

[0094] (1) 0.7 parts of carbon nanotubes and 57 parts of N-methylpyrrolidone dissolving 1.2 parts of sodium carboxymethyl cellulose are mixed and stirred at a stirring rate of 700rmp for 13min, and then the powder of 97 parts of artificial graphite is added and the stirring rate is Mix and stir at 500rmp for 32min, add 17 parts of N-methylpyrrolidone again for dispersing and stirring at a stirring rate of 2000rmp for 35min, and finally add 1.2 parts of polyvinylidene fluoride for viscosity adjustment at a stirring rate of 1000rmp for 13min, and pass the stirring rate Reverse stirring at 2200rmp for 1min to perform defoaming treatment to prepare the precursor of the first active material layer;

[0095] (2) 0.5 parts of carbon nanotubes and 52 parts of N-methylpyrrolidone dissolved in 1.2 parts of sodium polyacrylat...

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Abstract

The invention provides a lithium ion battery negative pole piece and a preparation method and application thereof. The negative pole piece comprises a current collector, a first active material layer in contact with the current collector, and a second active material layer in contact with the first active material layer, wherein an active material in the first active material layer is graphite; and an active substance in the second active substance layer is a binary mixed material of graphite and hard carbon. Through a double-layer coating technology, the current collector is firstly coated with a layer of graphite material with high compaction, high capacity and high bonding force, then the second layer of graphite / hard carbon composite slurry is coated on the basis, and through the composite slurry and a double-layer coating mode, the advantages of graphite and hard carbon are fully exerted; through different distribution in the direction perpendicular to the current collector, the fast charging performance of the negative pole piece is improved, and the negative pole piece with high fast charging performance and high compaction is prepared.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, and relates to a preparation method and application of a negative pole piece of a lithium-ion battery, in particular to a preparation method and application of a hard carbon composite negative electrode material for a high-power fast-charge lithium-ion battery. Background technique [0002] The current negative electrodes of lithium-ion batteries are mainly graphite, hard carbon, soft carbon, silicon-based materials, etc., and different negative electrodes have different characteristics. For example, graphite material is cheap, stable in properties and low in voltage platform, and is currently the most widely used negative electrode material. However, its expansion, circulation and kinetics are relatively general. Hard carbon is a kind of amorphous carbon material with large interlayer spacing, good kinetics, small lithium intercalation strain, and high capacity, but it has the problems of l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/133H01M4/139H01M4/1393H01M4/36
CPCH01M4/13H01M4/139H01M4/133H01M4/1393H01M4/364Y02E60/10
Inventor 刘永兴李若楠王水良王彦青孙化雨其他发明人请求不公开姓名
Owner ENVISION DYNAMICS TECH (JIANGSU) CO LTD
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