Positive pole piece and lithium ion battery

A technology of lithium ion batteries and positive electrode pieces, which is applied in the manufacture of battery electrodes, secondary batteries, electrolyte batteries, etc., can solve problems such as the inability to balance energy density and safety performance, and achieves improved nail penetration safety performance, guaranteed energy density, The effect of improving safety performance

Pending Publication Date: 2022-08-05
NINGDE AMPEREX TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 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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  • Positive pole piece and lithium ion battery
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preparation example Construction

[0031] The preparation of the lithium ion battery is described below, and the preparation method includes: preparation of positive pole piece, preparation of negative pole piece, preparation of electrolyte, preparation of separator and preparation of lithium ion battery, and specifically includes the following steps:

[0032] Preparation of positive electrode plate: (1) lithium cobalt oxide (LiCoO) 2 ), nickel cobalt manganese, nickel cobalt lithium aluminate, lithium iron phosphate (LiFePO 4 ), preferably lithium cobaltate (LiCoO 2 ), the conductive agent carbon black (Super P) is mixed with the binder polyvinylidene fluoride (the content of the binder can be adjusted within the range of 0.1-5wt%) according to the weight ratio of 90-98:1-2 , add N-methylpyrrolidone (NMP), stir under the action of a vacuum mixer until the system becomes a uniformly dispersed slurry, and obtain the upper cathode slurry; (2) such as lithium cobalt oxide (LiCoO 2 ), lithium nickel cobalt mangan...

Embodiment 1

[0040] (1) Preparation of positive electrode plate

[0041] The positive active material lithium cobaltate, the conductive agent Super P, and the binder polyvinylidene fluoride (PVDF) were mixed in a weight ratio of 97.6:2.3:0.1, and N-methylpyrrolidone (NMP) was added. Under the action of a vacuum mixer Stir until the system becomes a uniform slurry to obtain the upper layer positive electrode slurry;

[0042] The positive active material nickel cobalt lithium manganate, the conductive agent Super P, and the binder polyvinylidene fluoride (PVDF) were mixed in a weight ratio of 96.6:3.2:0.2, and N-methylpyrrolidone (NMP) was added. Under the action of stirring until the system becomes a uniform slurry, the lower layer positive electrode slurry is obtained;

[0043] First, the lower layer of positive electrode slurry is uniformly coated on the aluminum foil of the positive electrode current collector to prepare the first active material layer; the first active material layer i...

Embodiment 2

[0053] The preparation methods of the positive pole piece, the negative pole piece, the electrolyte, the separator and the lithium ion battery are the same as those in Example 1, the difference is that in the preparation process of the positive pole piece, the upper and lower layers of the positive electrode slurry are kept in the upper and lower layers. Under the condition that the content of the conductive agent SuperP is unchanged, the content of the binder polyvinylidene fluoride (PVDF) in the upper cathode slurry (corresponding to the second active material layer) is adjusted to 0.5 wt%, and the lower cathode slurry is adjusted. The content of the binder polyvinylidene fluoride (PVDF) (corresponding to the first active material layer) is such that the content of polyvinylidene fluoride (PVDF) in the lower cathode slurry is the same as the polyvinylidene fluoride (PVDF) in the upper cathode slurry. The content ratio of (PVDF) was 2.

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Abstract

The invention provides a positive pole piece and a lithium ion battery. The positive pole piece comprises a current collector; a first active material layer; and a second active material layer; wherein the first active material layer is arranged between the current collector and the second active material layer, both the first active material layer and the second active material layer comprise a binder, and the content of the binder in the first active material layer is greater than that of the binder in the second active material layer. According to the lithium ion battery, the active substance in the positive pole piece adopts a double-layer design, and the content of the binder in the first active substance layer is higher than that in the second active substance layer, so that the energy density of the lithium ion battery is ensured, and the aims of improving the binding power of the active substance layers and improving the nail penetrating safety performance of the lithium ion battery are fulfilled.

Description

[0001] This application is a divisional application of a Chinese patent application filed with the China Patent Office on February 26, 2018, the application number is 201810163122.0, and the invention name is "a positive electrode plate and a lithium ion battery". technical field [0002] The present application relates to the field of lithium ion batteries, and in particular, to a positive electrode piece and a lithium ion battery. Background technique [0003] The market's requirements for the safety of lithium-ion batteries are getting higher and higher, and at the same time, lithium-ion batteries are also required to maintain a high energy density. Therefore, it is necessary to cut into the corresponding technical elements for improvement. At present, the common technical means to improve the safety of lithium-ion batteries will cause Large energy density loss. Therefore, there is an urgent need to provide a technical means that can significantly improve the safety perfo...

Claims

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Application Information

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