A positive electrode plate and a lithium ion battery

A technology for lithium-ion batteries and positive pole pieces, which is applied in the manufacture of battery electrodes, secondary batteries, and electrolyte batteries. It can solve the problems of energy density and safety performance, reduce short-circuit heat generation, improve safety performance, The effect of improving the pass rate

Inactive Publication Date: 2018-12-14
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the defect that energy density and safety performance cannot be balanced in the prior art, according to the first aspect of the present application, a positive electrode sheet is provided, including: a current collector; a first active material layer; and a second active material layer; Wherein, the first active material layer is disposed between the current collector and the second active material layer, both the first active material layer and the second active material layer include a binder, and the first active material layer The binder content in an active material layer is greater than the binder content in the second active material layer

Method used

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  • A positive electrode plate and a lithium ion battery
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preparation example Construction

[0030] The following describes the preparation of lithium-ion batteries. The preparation method includes: preparation of positive pole pieces, preparation of negative pole pieces, preparation of electrolyte, preparation of separators and preparation of lithium-ion batteries, specifically including the following steps:

[0031] Positive electrode sheet preparation: (1) such as lithium cobalt oxide (LiCoO 2 ), nickel cobalt manganese, nickel cobalt lithium aluminate, lithium iron phosphate (LiFePO 4 ), preferably lithium cobaltate (LiCoO 2 ) positive electrode active material, conductive agent carbon black (Super P) are mixed with binder polyvinylidene fluoride (binder content can be adjusted in the range of 0.1-5wt%) according to the weight ratio of 90-98:1-2 , add N-methylpyrrolidone (NMP), and stir under the action of a vacuum mixer until the system is dispersed into a uniform slurry to obtain the upper positive electrode slurry; (2) such as lithium cobaltate (LiCoO 2 ), ni...

Embodiment 1

[0039] (1) Preparation of positive pole piece

[0040] Mix the positive electrode active material lithium cobaltate, the conductive agent Super P, and the binder polyvinylidene fluoride (PVDF) according to the weight ratio of 97.6:2.3:0.1, add N-methylpyrrolidone (NMP), under the action of a vacuum mixer Stir until the system becomes a uniform slurry to obtain the upper positive electrode slurry;

[0041] Mix the positive electrode active material nickel-cobalt lithium manganese oxide, the conductive agent Super P, and the binder polyvinylidene fluoride (PVDF) according to the weight ratio of 96.6:3.2:0.2, add N-methylpyrrolidone (NMP), and mix in a vacuum mixer Stir under action until the system forms a uniform slurry to obtain the lower positive electrode slurry;

[0042] Firstly, the lower positive electrode slurry was evenly coated on the positive electrode current collector aluminum foil to prepare the first active material layer; the first active material layer was drie...

Embodiment 2

[0052] The preparation method of the positive pole piece, the negative pole piece, the electrolyte, the separator and the lithium ion battery are all the same as in Example 1, the difference is that, in the preparation process of the positive pole piece, while maintaining the upper and lower positive electrode slurry When the content of the conductive agent SuperP is constant, the content of the binder polyvinylidene fluoride (PVDF) in the upper positive electrode slurry (corresponding to the second active material layer) is adjusted to 0.5wt%, and the lower positive electrode slurry is adjusted The content of binder polyvinylidene fluoride (PVDF) in (corresponding to the first active material layer) is such that the content of polyvinylidene fluoride (PVDF) in the positive electrode slurry of the lower layer is the same as that of polyvinylidene fluoride in the positive electrode slurry of the upper layer. The content ratio of (PVDF) was 2.

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Abstract

A positive electrode sheet and a lithium ion battery are provided. A positive electrode sheet includes: a current collector; A first active material layer; And a second active material layer; Whereina first active material layer is disposed between the current collector and the second active material layer, the first active material layer and the second active material layer each comprising a binder, and the binder content in the first active material layer is greater than the binder content in the second active material layer. In the present application, the active material in the positive electrode sheet adopts a two-layer design, and the content of the binder in the first active material layer is higher than that in the second active material layer, so that the energy density of the lithium ion battery is ensured, and the purpose of improving the bonding force of the active material layer and the safety performance of the lithium ion battery is achieved.

Description

technical field [0001] The present application relates to the field of lithium-ion batteries, in particular, to a positive pole piece and a lithium-ion battery. Background technique [0002] The market has higher and higher requirements for the safety of lithium-ion batteries. At the same time, lithium-ion batteries are also required to maintain a high energy density. Larger loss of energy density. Therefore, there is an urgent need to provide a technical means that can significantly improve the safety performance of lithium-ion batteries under the condition of high volumetric energy density. Contents of the invention [0003] In order to solve the defect that energy density and safety performance cannot be balanced in the prior art, according to the first aspect of the present application, a positive electrode sheet is provided, including: a current collector; a first active material layer; and a second active material layer; Wherein, the first active material layer is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/62H01M10/0525H01M10/058
CPCH01M4/13H01M4/622H01M4/623H01M10/0525H01M10/058Y02P70/50
Inventor 韩冬冬
Owner NINGDE AMPEREX TECH
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