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Lithium ion battery, positive paste, positive pole plate and preparation method of positive pole plate

A lithium-ion battery and positive electrode slurry technology, which is applied in the direction of electrode manufacturing, battery electrodes, secondary batteries, etc., can solve the problems that affect the specific capacity and cycle performance of the battery, and cannot improve the specific energy of the battery, so as to achieve the improvement of compaction density, The effect of increasing the specific energy density

Inactive Publication Date: 2017-09-22
SHENZHEN BAK POWER BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the blind pursuit of high compaction will not only fail to increase the specific energy of the battery, but will seriously affect the specific capacity and cycle performance of the battery.

Method used

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  • Lithium ion battery, positive paste, positive pole plate and preparation method of positive pole plate
  • Lithium ion battery, positive paste, positive pole plate and preparation method of positive pole plate
  • Lithium ion battery, positive paste, positive pole plate and preparation method of positive pole plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] In this example, using D 50 8.0μm nickel cobalt lithium manganese oxide material A and D 50 The 10.5 μm nickel-cobalt lithium manganese oxide material B was prepared according to the ratio of 0.3:0.7 (A:B, w:w).

[0044] In this example, the solvent is NMP, the binder is PVDF, and the conductive agent is SP.

[0045] In the positive electrode slurry in this example, the weight ratio (w / w) of nickel cobalt lithium manganese oxide material (A and B): binder: conductive agent is 94:2:4.

[0046] In the positive electrode slurry in this example, the mass fraction of the solvent is: 35%.

[0047] The specific preparation process of positive electrode slurry in this example is as follows:

[0048] 1) Mix material A and material B, and stir at a mixing speed of 20r / min, so that the two materials are fully mixed to obtain mixed material C

[0049] 2) Mix 100% solvent and 50% binder, first stir at a slow speed of 20r / min, and then quickly stir at 1500r / min to obtain glue sol...

Embodiment 2

[0058] In this example, using D 50 8.5μm nickel cobalt lithium manganese oxide material A and D 50 The 11 μm nickel-cobalt lithium manganese oxide material B was prepared at the ratio of 0.5:0.5 (A:B, w:w) to prepare the positive electrode slurry.

[0059] The types of solvent, binder and conductive agent, and the mass fraction of solvent in the positive electrode slurry in this example are the same as those in Example 1.

[0060] In the positive electrode slurry in this example, the weight ratio (w / w) of nickel cobalt lithium manganese oxide material (A and B): binder: conductive agent is 95:2:3.

[0061] At the same time, the relevant preparation steps of the positive electrode slurry, positive electrode sheet, and battery in this example are also the same as in Example 1. For the charge and discharge curve of lithium ion battery 2 prepared in this example, please refer to image 3 , for the compacted density of the positive electrode sheet material in this example, see f...

Embodiment 3

[0063] In this example, using D 50 7.5μm nickel cobalt lithium manganese oxide material A and D 50 The 10.5 μm nickel-cobalt-lithium manganese oxide material B was prepared according to the ratio of 0.2:0.8 (A:B, w:w).

[0064] The types of solvent, binder and conductive agent, and the mass fraction of solvent in the positive electrode slurry in this example are the same as those in Example 1.

[0065] In the positive electrode slurry in this example, the weight ratio (w / w) of nickel cobalt lithium manganese oxide material (A and B): binder: conductive agent is 93:1:6.

[0066] Wherein, the specific preparation process of positive electrode slurry in this example is as follows:

[0067] 1) Mix material A and material B, and stir at a mixing speed of 40r / min, so that the two materials are fully mixed to obtain mixed material C

[0068] 2) Mix 100% solvent with 50% binder, first stir at a slow speed of 40r / min, and then stir at a fast speed of 3000r / min to obtain glue solutio...

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Abstract

The invention provides a lithium ion battery positive paste, a preparation method thereof, a lithium ion battery and a positive pole plate. The positive paste provided by the invention comprises a lithium nickel manganese cobalt material, a binding agent, a conductive agent and a solvent, wherein the lithium nickel manganese cobalt material comprises a lithium nickel manganese cobalt material A with D50 being 7.5-9.5 micrometers and a lithium nickel manganese cobalt material B with D50 being 10.5-11.5 micrometers, and the mass ratio of the lithium nickel manganese cobalt material A and the lithium nickel manganese cobalt material B is (0.2:0.8)-(0.8:0.2). The lithium nickel manganese cobalt material with different grain sizes are used for preparing the positive paste according a certain proportion, the positive paste is used for preparing the battery positive pole plate, thus, the compaction density of the positive electrode material obtained by preparation is improved, and meanwhile, the specific energy density of the battery obtained by preparation is finally improved.

Description

technical field [0001] The present application relates to the technical field of lithium-ion batteries, in particular to a lithium-ion battery cathode slurry and a preparation method thereof, a lithium-ion battery cathode sheet and a lithium-ion battery. Background technique [0002] New energy technology is recognized as a high-tech in the 21st century, and lithium-ion batteries, as an important part of the new energy industry, have broad application prospects. At present, among the commercialized rechargeable batteries, lithium-ion batteries have the highest specific energy, and are developing in the direction of small, light and thin, especially polymer batteries, which have realized the thinning of rechargeable batteries. Due to the relatively high volume specific energy and mass specific energy of lithium-ion batteries, and no pollution, there is a rapid growth in developed countries, and rapid development in the telecommunications and information markets. It is genera...

Claims

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Application Information

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IPC IPC(8): H01M4/04H01M4/131H01M4/1391H01M4/505H01M4/525H01M10/0525
CPCH01M4/04H01M4/131H01M4/1391H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 张玉晖黄玉元钟传来单旭秦春阳
Owner SHENZHEN BAK POWER BATTERY CO LTD
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