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Positive pole piece and preparation method thereof, lithium ion battery containing positive pole piece and application of lithium ion battery

A technology of lithium ion battery and positive pole piece is applied in the field of lithium ion battery, which can solve the problems of small battery adaptability range, inability to guarantee battery power performance, and complex battery structure, so as to avoid high temperature performance deterioration of battery cells and increase battery stability. Sexuality, the effect of reducing side effects

Active Publication Date: 2020-10-30
东莞维科电池有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the structure of the battery is complicated, the preparation process is various, and the power performance of the battery cannot be guaranteed under the condition of 60°C, and the application range is small.
[0006] The lithium-ion batteries described in the above-mentioned documents all have problems such as a small temperature range for the battery and poor power performance, which cannot well solve the problem of power reduction of the lithium battery at a high temperature of 60°C.

Method used

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  • Positive pole piece and preparation method thereof, lithium ion battery containing positive pole piece and application of lithium ion battery
  • Positive pole piece and preparation method thereof, lithium ion battery containing positive pole piece and application of lithium ion battery
  • Positive pole piece and preparation method thereof, lithium ion battery containing positive pole piece and application of lithium ion battery

Examples

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Embodiment 1

[0067] This embodiment provides a positive electrode sheet, including a current collector, a first active material layer, and a second active material layer, the first active material layer is located between the current collector and the second active material layer, and the first active material layer is located between the current collector and the second active material layer. Both the first active material layer and the second active material layer include a positive electrode active material, a conductive agent and a binding agent. The current collector adopts aluminum foil, the positive electrode active material is lithium cobaltate, and the binding agent is polyvinylidene fluoride (polyvinylidene fluoride, PVDF), the conductive agent is a composite conductive agent of carbon black and carbon nanotubes, and the compounding ratio of the carbon black and carbon nanotubes is 1:1;

[0068] Wherein, in the first active material layer, the particle size D50 of lithium cobaltat...

Embodiment 2

[0079]The difference between this example and Example 1 is that the D50 of the lithium cobaltate particles used in the first active material layer of the positive electrode sheet is 5.0 μm, the D90 is 11 μm, and the D10 is 3.5 μm. The second active material layer uses Among the lithium cobaltate particles, the D50 of the lithium cobaltate particles with the first particle size is 5 μm, the D90 is 11 μm, and the D10 is 3.5 μm; the D50 of the lithium cobaltate particles with the second particle size is 14 μm, the D90 is 24 μm, and the D10 is 8 μm. Other parameters and conditions are exactly the same as in Example 1.

Embodiment 3

[0081] The difference between this embodiment and Embodiment 1 is that, based on the sum of the mass of the first active material layer and the second active material layer as 100%, the mass of the first active material layer accounts for 85wt.%. , the second active material layer accounts for 15wt.%. Other parameters and conditions are exactly the same as in Example 1.

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Abstract

The invention provides a positive pole piece and a preparation method thereof, a lithium ion battery containing the positive pole piece and application of the lithium ion battery. The positive pole piece comprises a current collector, a first active substance layer and a second active substance layer which are sequentially stacked, and lithium cobalt oxide particles in the second active substancelayer comprise lithium cobalt oxide particles with first particle sizes and lithium cobalt oxide particles with second particle sizes, wherein the D50 of the lithium cobalt oxide particles with the first particle size is 5-8 [mu]m; and the D50 of the lithium cobalt oxide particles with the second particle size is 12 [mu]m-16 [mu]m. By adopting the structure, the high-temperature storage performance and the power performance after high-temperature storage of the battery are greatly improved while the power performance of the battery is not lost, and the power performance and the high-temperature storage performance of the unmanned aerial vehicle battery are well considered.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and relates to a positive pole piece and a preparation method thereof, a lithium ion battery containing the positive pole piece and an application thereof. Background technique [0002] As a new energy industry, the application fields of lithium-ion batteries are constantly developing and expanding, such as mobile phones, digital cameras, notebook computers, drones, starter power supplies, electric vehicles, and energy storage power stations. In recent years, drone technology has continued to innovate, and lithium-ion batteries have also developed rapidly in this field. Compared with ordinary batteries, the working conditions and environment of UAV batteries are more complicated. Most of them are in harsh and unmanned areas with large temperature differences. This is the environmental adaptability of UAV batteries. put forward higher requirements. [0003] At present, the normal discharge t...

Claims

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Application Information

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IPC IPC(8): H01M4/131H01M4/525H01M4/1391H01M10/0525
CPCH01M4/131H01M4/1391H01M4/525H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 梁晓静楚英夏小勇陶德瑜
Owner 东莞维科电池有限公司
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