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Lithium ion battery negative pole piece and preparation method and application thereof

A lithium-ion battery and negative pole piece technology, which is applied in the field of lithium-ion batteries, can solve problems affecting the design and performance of lithium-ion batteries, and limit use, so as to promote battery performance, increase energy density, and prevent expansion and deformation.

Pending Publication Date: 2021-12-07
TIANJIN ENERGIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the expansion of the negative electrode during the charging and discharging process can be reduced through the design of the negative electrode material, such as raw material selection, changing the degree of graphitization, and surface coating materials, etc., these designs change the original characteristics of the active material and have a negative impact on the capacity of the negative electrode material. The first efficiency and processing performance have a greater impact, which further affects the design and performance of lithium-ion batteries, thus limiting the use of

Method used

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  • Lithium ion battery negative pole piece and preparation method and application thereof
  • Lithium ion battery negative pole piece and preparation method and application thereof
  • Lithium ion battery negative pole piece and preparation method and application thereof

Examples

Experimental program
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Embodiment 1

[0069] This embodiment provides a lithium ion battery negative pole piece, the lithium ion battery negative pole piece includes a first active material, a second active material, conductive carbon black and polyvinylidene fluoride; the first active material and the second active material The elastic modulus of the two active materials, and the volume percentage of the negative active material are as shown in Table 1, the elastic modulus of the first active material is 1.29 times the elastic modulus of the second active material, the first active material Particle size D of the active material 50 is 20 μm, the particle size D of the second active material 50 is 12 μm, the particle size D of the first active material and the second active material 50 The ratio is 1:0.6; the first active material is artificial graphite, and the second active material is natural graphite.

[0070] The porosity of the negative pole sheet of the lithium-ion battery is 29.0%, and the relationship b...

Embodiment 2

[0074] This embodiment provides a lithium-ion battery negative pole piece, the lithium-ion battery negative pole piece includes a first active material, a second active material, carbon nanotubes and styrene-butadiene rubber; the first active material and the second The modulus of elasticity of the active material and the volume percentage of the negative active material are shown in Table 1. The modulus of elasticity of the first active material is 1.8 times that of the second active material. Material particle size D 50 is 20 μm, the particle size D of the second active material 50 is 14 μm, the particle size D of the first active material and the second active material 50 The ratio is 1:0.7; the first active material is artificial graphite, and the second active material is natural graphite.

[0075] The porosity of the negative pole sheet of the lithium-ion battery is 29.4%, and the relationship between the porosity and the volume percentage of the negative active materi...

Embodiment 3

[0079] This embodiment provides a lithium-ion battery negative pole piece, the lithium-ion battery negative pole piece includes a first active material, a second active material, graphene and polyacrylic acid; the first active material and the second active material The modulus of elasticity and the volume percentage of the negative electrode active material are shown in Table 1, the modulus of elasticity of the first active material is 1.19 times that of the second active material, and the modulus of elasticity of the first active material is Particle size D 50 is 20 μm, the particle size D of the second active material 50 is 12 μm, the particle size D of the first active material and the second active material 50The ratio is 1:0.6; the first active material includes artificial graphite component 1 and natural graphite component 2, and the second active material is natural graphite.

[0080] The porosity of the negative pole sheet of the lithium-ion battery is 29.2%, and th...

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Abstract

The invention provides a lithium ion battery negative electrode plate and a preparation method and application thereof, the lithium ion battery negative electrode plate comprises a negative electrode active material, and the highest elastic modulus of the negative electrode active material is 1.18 times or more of the lowest elastic modulus. The negative electrode active materials with different elastic moduli are matched for use, the negative electrode active material with the high elastic modulus plays a role of a framework to prevent the negative electrode piece from deforming due to expansion, and the negative electrode active material with the low elastic modulus absorbs stress generated by the negative electrode piece of the lithium ion battery in the charging process through deformation of the negative electrode active material with the low elastic modulus. The overall charging expansion rate of the negative pole piece of the lithium ion battery is reduced, meanwhile, the elasticity modulus characteristic and the accumulation mode of the negative electrode active material have a synergistic effect, so that the expansion of the negative electrode plate of the lithium ion battery is reduced, and the energy density of the lithium ion battery is further improved.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and relates to a lithium ion battery negative pole piece, in particular to a lithium ion battery negative pole piece and its preparation and application. Background technique [0002] At present, it is necessary to continuously improve the energy density of lithium-ion batteries to meet the market demand for long mileage of pure electric vehicles. Conventional lithium-ion batteries usually increase the capacity density of the battery in the following ways: (1) by using positive and negative active materials with higher gram capacity; (2) increasing the amount of active materials, improving material compaction and increasing material density. (3) Reduce the amount of inactive materials, that is, reduce the conductive agent and binder content in the electrode formulation, and reduce the thickness of the current collector and diaphragm. [0003] CN 102610804A discloses a method for preparing a ...

Claims

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Application Information

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IPC IPC(8): H01M4/13H01M4/139H01M4/04H01M4/36H01M4/62H01M10/0525
CPCH01M4/13H01M4/139H01M4/0404H01M4/36H01M4/621H01M4/625H01M10/0525H01M2004/027H01M2004/021Y02E60/10
Inventor 李兴旺李文文
Owner TIANJIN ENERGIES
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