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Positive plate and lithium ion battery comprising same

A positive electrode sheet and positive electrode material technology, applied in the direction of batteries, positive electrodes, battery electrodes, etc., can solve the problems of increasing the internal resistance of the battery, increasing the internal resistance, reducing the energy density of the battery, etc. The effect of increasing and improving cycle performance

Inactive Publication Date: 2015-11-25
CONTEMPORARY AMPEREX TECH CO
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, choosing this method will generally greatly reduce the energy density of the battery while improving safety, and increase the internal resistance of the battery when it is applied at a low state of charge (SOC).
In addition, this method is still difficult to significantly improve battery safety for batteries used in large-capacity electric vehicles.
[0003] In addition, in some other existing technologies, in order to improve the safety of the battery, after coating the active material layer on the positive electrode current collector, another active material layer is coated, but this method will lead to the polarization of the battery. Increase, cycle performance decay or even dive
[0004] However, the above-mentioned ways to improve battery safety will degrade the performance and reliability of the battery, such as reducing the energy density of the battery, increasing the internal resistance of the battery, and cyclic diving, etc.

Method used

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  • Positive plate and lithium ion battery comprising same
  • Positive plate and lithium ion battery comprising same
  • Positive plate and lithium ion battery comprising same

Examples

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preparation example Construction

[0044] In the preparation method of the above-mentioned positive electrode sheet, the preparation order of the first active material layer and the second active material layer can also be reversed, that is, the second active material layer is first prepared on the positive electrode current collector, and then a buffer layer is formed on the second active material layer. layer, and finally the first active material layer is formed on the buffer layer.

[0045] Another object of the present application is to provide a lithium battery, including the positive electrode sheet provided in the present application.

[0046] Because the lithium-ion battery contains the positive electrode sheet provided by the present application, the lithium-ion battery has good safety performance, for example, it is not easy to catch fire and explode under abuse conditions. In addition, the internal resistance of the lithium-ion battery increases during polarization and discharge. There are few pheno...

Embodiment 1～7

[0061] Preparation of Examples 1-7 Lithium-ion Batteries 1-7

[0062] Lithium-ion batteries (referred to as batteries) 1 to 7 are all prepared according to the following method:

[0063] 1. Preparation of positive electrode sheet

[0064] Positive electrode sheets (abbreviated as electrode sheets) 1 to 7 are prepared according to the following method:

[0065] (1) Add the first positive electrode active material or the second positive electrode active material, the positive electrode conductive agent and the positive electrode binder into the solvent, after mixing uniformly, use a sprayer to coat the uniformly mixed slurry on the positive electrode current collector to form The first active material layer is selected to be dried at 85°C after coating;

[0066] (2) Add the carbon material and the bond to the solvent, and after mixing evenly, coat it on the first active material layer obtained in step (1) to form a buffer layer, wherein, after coating, select the temperature a...

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Abstract

The invention relates to a positive plate and a lithium ion battery comprising the same. The positive plate comprises a positive current collector, a first active material layer, a buffer layer and a second active material layer, wherein the first active material layer, the buffer layer and the second active material layer are arranged on the positive current collector; the first active material layer is arranged on the positive current collector and comprises a first positive active material; the buffer layer comprises a carbon material and a binder; the second active material layer comprises a second positive active material; and the buffer layer is arranged between the first active material layer and the second active material layer. After the positive plate provided by the invention is applied to the lithium battery, the safety performance of the lithium ion battery can be improved; and the cycle performance of the lithium ion battery can be improved.

Description

technical field [0001] The present application relates to the field of lithium batteries, in particular, to a positive electrode sheet and a lithium ion battery including the positive electrode sheet. Background technique [0002] In order to improve the safety of batteries, in most of the existing technologies, materials with higher safety are mixed in the slurry. In most cases, a high proportion of materials with higher safety is required to The effect of obviously improving battery safety is achieved. However, choosing this method will generally greatly reduce the energy density of the battery while improving safety, and increase the internal resistance of the battery when it is applied at a low state of charge (SOC). In addition, it is still difficult for this method to significantly improve battery safety for batteries used in large-capacity electric vehicles. [0003] In addition, in some other existing technologies, in order to improve the safety of the battery, aft...

Claims

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Application Information

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IPC IPC(8): H01M4/64H01M4/36H01M4/62H01M10/0525
CPCH01M4/36H01M4/62H01M4/64H01M10/0525H01M4/13H01M4/139H01M4/366H01M4/505H01M4/525H01M4/5825H01M4/621H01M4/625H01M2004/021Y02E60/10H01M4/131H01M4/136H01M10/4235H01M2004/028H01M2200/00H01M2220/20
Inventor 李振华裴振兴邹武元
Owner CONTEMPORARY AMPEREX TECH CO
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