A fast-charging positive electrode sheet with high specific energy and its preparation method and application

A positive electrode sheet, content technology, applied in the direction of battery electrodes, non-aqueous electrolyte battery electrodes, structural parts, etc., can solve the problems of limited use, short battery life, long charging time, etc., to increase stability, increase specific capacity, reduce The effect of coating difficulty

Active Publication Date: 2021-04-13
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the commercial lithium-ion battery has a short battery life, and the charging time is more than 2-5 hours. The charging time is long, which limits people's use.

Method used

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  • A fast-charging positive electrode sheet with high specific energy and its preparation method and application
  • A fast-charging positive electrode sheet with high specific energy and its preparation method and application
  • A fast-charging positive electrode sheet with high specific energy and its preparation method and application

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preparation example Construction

[0054] The preparation method of the present invention will be further described in detail in conjunction with specific examples below. It should be understood that the following examples are only for illustrating and explaining the present invention, and should not be construed as limiting the protection scope of the present invention. All technologies realized based on the above contents of the present invention are covered within the scope of protection intended by the present invention.

[0055] The experimental methods used in the following examples are conventional methods unless otherwise specified; the reagents and materials used in the following examples can be obtained from commercial sources unless otherwise specified.

[0056] In the description of the present invention, it should be noted that the terms "first", "second" and so on are only used for descriptive purposes, and do not indicate or imply relative importance.

Embodiment 1

[0058] The first step: prepare the first active material slurry: add the active material (lithium cobaltate), conductive agent (conductive carbon black) and binder (PVDF) into the stirring tank according to the mass ratio of 95.6:3.5:0.9, According to the known batching process, NMP is added and fully stirred, passed through a 200-mesh sieve, and made into the first active material slurry, and the positive electrode slurry has a solid content of 70% to 75%;

[0059] The second step: prepare the second active material slurry: add the active material (lithium iron phosphate), conductive agent (conductive carbon black) and binder (lithium carboxymethyl cellulose) according to the mass ratio of 96.0:2.0:2.0 Put it into the mixing tank, add deionized water according to the known batching process and stir thoroughly, pass through a 200-mesh screen, and make the second active material slurry, the positive electrode slurry has a solid content of 70% to 75%;

[0060] Step 3: Prepare th...

Embodiment 2

[0064] Other preparation steps are with embodiment 1, and difference is only in:

[0065] The first step: Active material (lithium cobaltate), conductive agent (conductive carbon black) and binder (PVDF) are added to the stirring tank according to the mass ratio of 96.0:3.1:0.9;

[0066] The second step: Active material (lithium iron phosphate), conductive agent (conductive carbon black) and binder (lithium carboxymethyl cellulose) are added into the stirring tank according to the mass ratio of 96.5:2.0:1.5.

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Abstract

A fast-charging positive electrode sheet with high specific energy and its preparation method and application, which includes a current collector, a first active material layer and a second active material layer; the first active material layer is coated on the current collector, and the first active material layer is coated on the current collector. Two active material layers are coated on the surface of the first active material layer; the first active material layer includes the first active material and a first binder selected from oily binders, and the second active material layer includes the first active material layer Two active materials and a second binder selected from aqueous binders; wherein the aqueous binder includes water-soluble lithium cellulose and / or lithium polyacrylate; the second active material includes lithium iron phosphate. Furthermore, the first active material layer contains more conductive agents, which can directly function as a carbon-coated current collector, reduce the cost of the manufacturing process, and simultaneously improve the dynamic performance of the oily slurry. Lithium iron phosphate with good rate performance is used in the second active material layer, which can significantly improve the energy density and rate performance of the battery.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a fast-charging positive electrode sheet with high specific energy and a preparation method and application thereof. Background technique [0002] With the rapid development of portable electronic products (mobile phones, computers, drones, etc.), the market has put forward higher requirements for the endurance and fast charging capabilities of lithium-ion batteries. The current commercial lithium-ion battery has a short battery life, and the charging time is more than 2-5 hours. The charging time is long, which limits people's use. At the same time, with the acceleration of people's life, more and more users hope that lithium-ion batteries have longer battery life and shorter charging time, and then need to solve people's problems from the perspective of fast charging and improving the energy density of the battery itself. Anxiety about battery life. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/13H01M4/139H01M4/36H01M4/525H01M4/58H01M4/62H01M10/0525
CPCH01M4/13H01M4/139H01M4/364H01M4/366H01M4/525H01M4/5825H01M4/621H01M10/0525Y02E60/10
Inventor 张保海彭冲贺伟施超李俊义徐延铭
Owner ZHUHAI COSMX BATTERY CO LTD
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