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High-specific-energy fast-charging positive plate and preparation method and application thereof

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

Active Publication Date: 2020-09-08
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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  • High-specific-energy fast-charging positive plate and preparation method and application thereof
  • High-specific-energy fast-charging positive plate and preparation method and application thereof
  • High-specific-energy fast-charging positive plate and preparation method and application thereof

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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

The invention discloses a high-specific-energy fast-charging positive plate and a preparation method and application thereof. The high-specific-energy fast-charging positive plate comprises a currentcollector, a first active substance layer and a second active substance layer. The first active substance layer is coated on the current collector, and the second active substance layer is coated on the surface of the first active substance layer; the first active substance layer comprises a first active substance and a first binder selected from an oily binder; and the second active substance layer comprises a second active substance and a second binder selected from an aqueous binder; the water-based binder comprises water-soluble cellulose lithium and / or lithium polyacrylate; and the secondactive substance comprises lithium iron phosphate. Furthermore, the first active substance layer contains more conductive agents and can directly play a role of a carbon-coated current collector, sothat the cost of the manufacturing process is reduced; meanwhile, the dynamic performance of the oily slurry can also be improved. And lithium iron phosphate with good rate capability is adopted in the second active substance layer, so that the energy density and the rate capability of the battery are remarkably improved.

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 Applications(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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