Negative plate, battery and electronic equipment

A technology of negative electrode sheet and battery, which is applied to non-aqueous electrolyte battery electrodes, secondary batteries, circuits, etc., can solve the problems of easy lithium precipitation of negative electrode sheets, and achieve the effect of improving cycle life and reducing poor kinetics of lithium intercalation.

Pending Publication Date: 2022-04-05
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The application provides a negative electrode sheet, battery and electronic equipment to solve the problem that the negative electrode sheet is easy to decompose lithium

Method used

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  • Negative plate, battery and electronic equipment
  • Negative plate, battery and electronic equipment

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Embodiment 1: the first coating 20 (layer B) includes 0.1% silicon oxide, the first conductive agent includes 40% carbon black+0.5% multi-wall, and the first auxiliary material includes thickener+binding agent+dispersant , silicon oxide particles D99≤1.5 μm; the second coating 30 (layer A) includes 97.0% graphite, the second conductive agent includes 0.5% carbon black, and the second auxiliary material includes thickener + binder. The half-electric thickness of the first coating 20 is 1.5 μm, and the half-electric thickness of the second coating 30 is 38.6 μm. In the case of 3C step cycles, after testing 800 cycles, the capacity retention rate is 90.5%, and the ratio (expansion change rate) of the final full-charge thickness of the cycle to the initial half-charge thickness of the cycle is 8.1%.

Embodiment 2

[0040] Embodiment 2: the first coating 20 (layer B) includes 3.0% silicon oxide, the first conductive agent includes 40% carbon black+0.02% single-wall+0.8% multi-wall, the first auxiliary material includes thickener+viscosity Binder + dispersant, silicon oxide particles D99≤1.5μm; the second coating 30 (layer A) includes graphite with a content of 96.1%, the second conductive agent includes carbon black with a content of 1%, and the second auxiliary material includes a thickener+ binder. The half-electric thickness of the first coating 20 is 2.0 μm, and the half-electric thickness of the second coating 30 is 35.6 μm. In the case of 5C step cycle, after testing 500 cycles, the capacity retention rate is 82.3%, and the ratio (expansion change rate) of the final full-charge thickness of the cycle to the initial half-charge thickness of the cycle is 9.2%.

Embodiment 3

[0042] Embodiment 3: the first coating 20 (layer B) includes 5.0% silicon oxide, the first conductive agent includes 50% carbon black+0.02% single-wall+1% multi-wall, the first auxiliary material includes thickener+viscosity Binder + dispersant, silicon oxide particles D99≤1.5μm; the second coating 30 (layer A) includes graphite with a content of 96.1%, the second conductive agent includes carbon black with a content of 1%, and the second auxiliary material includes a thickener+ binder. The half-electric thickness of the first coating 20 is 2.0 μm, and the half-electric thickness of the second coating 30 is 30.0 μm. In the case of 2C step cycles, after testing 600 cycles, the capacity retention rate is 82.1%, and the ratio of the final fully charged thickness to the initial half-charged thickness (expansion change rate) is 8.9%.

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Abstract

The invention provides a negative plate, a battery and electronic equipment, the negative plate comprises a current collector, a first coating and a second coating, the surface of at least one side of the current collector is coated with the first coating, and the surface of the first coating is coated with the second coating; the first coating comprises a first active material and a first conductive agent, the first active material is a silicon-based material, the second coating comprises a second active material, and the second active material is graphite. The lithium separation problem of the negative plate can be improved.

Description

technical field [0001] The present application relates to the technical field of batteries, in particular to a negative electrode sheet, a battery and electronic equipment. Background technique [0002] Lithium-ion batteries are widely used in smartphones, notebook computers, Bluetooth, wearable devices and other fields due to their advantages such as high energy density, no memory effect, and long life. Lithium-ion batteries mainly rely on the movement of lithium ions between the positive and negative electrodes to work. Existing lithium-ion batteries increase the energy density of lithium-ion batteries by doping part of the silicon-based materials in the negative electrode graphite, but the silicon-based materials mixed with graphite are often It has poor lithium intercalation kinetics, which makes the negative electrode easy to separate lithium. Contents of the invention [0003] The present application provides a negative electrode sheet, a battery and an electronic d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M10/0525
CPCY02E60/10
Inventor 许岩彭冲石越李俊义
Owner ZHUHAI COSMX BATTERY CO LTD
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