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Negative electrode active material, negative electrode plate and lithium ion battery

A technology of negative electrode active material and negative electrode sheet, which is applied in the field of negative electrode sheet, lithium ion battery and negative electrode active material, can solve the problems of consuming reversible lithium ions, reducing the capacity retention rate of lithium ion battery, etc. Conductivity, the effect of improving cycle performance

Active Publication Date: 2016-07-20
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But during charging, if figure 1 and figure 2 As shown, the particle expansion of the alloy material will produce cracks, and the conductive polymer material is only coated on the outer surface of the particle of the alloy material, resulting in the formation of a new SEI film in the crack, which will consume reversible lithium ions and reduce the lithium ion density. battery capacity retention

Method used

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  • Negative electrode active material, negative electrode plate and lithium ion battery
  • Negative electrode active material, negative electrode plate and lithium ion battery
  • Negative electrode active material, negative electrode plate and lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0041] 1. Preparation of negative electrode active materials

[0042] (1) Add 20g of alloy material particles SiO with a D50 of 3 μm, 1.18g of monomer aniline of conductive polymer material and 2.48g of phytic acid into 250g of distilled water and stir for 10min at a speed of 1000rpm to form a suspension A;

[0043] (2) 1.10g ammonium persulfate is dissolved in 100g distilled water to form solution B;

[0044] (3) Drop solution B into suspension A. The dropping process lasts for 10 minutes and stir at a speed of 500 rpm. After the dropping is completed, continue stirring at a speed of 500 rpm for 1 hour to form suspension C;

[0045] (4) Filter the suspension C, rinse the filter cake with distilled water, and dry at 85° C. for 12 hours to obtain the initial negative electrode active material, that is, alloy material particles coated with a conductive polymer material;

[0046] (5) 0.049g shell polymer material polyacrylic acid is added in 100g distilled water and stirred at a...

Embodiment 2

[0053] Lithium-ion batteries were prepared according to the method of Example 1, except for the following differences:

[0054] 1. Preparation of negative electrode active materials

[0055] The conductive polymer material is polypyrrole, and before step (1), SiO and the conductive polymer material are ball milled at a speed of 500 rpm for 0.5 h, wherein the diameter of the zirconium ball is 10 mm.

Embodiment 3

[0057] Lithium-ion batteries were prepared according to the method of Example 1, except for the following differences:

[0058] 1. Preparation of negative electrode active materials

[0059] The conductive polymer material is poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonic acid), and before step (1), the SiO and conductive polymer material are ball milled at a speed of 500rpm for 0.5 h, where the diameter of the zirconium ball is 10mm.

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Abstract

The invention provides a negative electrode active material, a negative electrode plate and a lithium ion battery. The negative electrode active material comprises alloy material particles (1), a conductive layer (2) and a housing layer (3), wherein the conductive layer (2) is composed of a conductive polymer material and covers the entire or partial surface of the alloy material particles (1); the housing layer (3) is composed of a housing layer polymer material and covers the partial surface, far away from the alloy material particles (1), of the conductive layer (2); and intermolecular interaction force exists between the conductive polymer material of the conductive layer (2) and the housing layer polymer material of the housing layer (3). The negative electrode plate comprises the negative electrode active material. The lithium ion battery comprises the negative electrode plate. The lithium ion battery has excellent cycle performance.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a negative electrode active material, a negative electrode sheet and a lithium ion battery. Background technique [0002] In recent years, with the increasing demand for energy density of lithium-ion batteries, traditional lithium-ion batteries using graphite as the negative electrode active material and lithium peroxide as the positive electrode active material can no longer meet practical applications. Using alloy materials instead of graphite as the negative electrode active material of lithium-ion batteries is an effective way to increase the energy density of lithium-ion batteries. However, the alloy material has a large volume change during the charge and discharge process, for example, the maximum volume change of silicon can reach 400% during the charge and discharge process. The volume change will cause the structural destruction of the alloy material. At the same time, as the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/62H01M4/134H01M10/0525
CPCY02E60/10
Inventor 池田泰大
Owner NINGDE AMPEREX TECH
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