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Lithium ion battery pole piece, preparation method thereof and lithium ion battery

A lithium-ion battery and pole piece technology, applied in electrode manufacturing, battery electrode, electrode collector coating, etc., can solve the problems affecting the charging and discharging process, limited improvement of battery energy density and power performance, etc. Ionic conductivity, improving electron conductivity and lithium ion transport properties, improving the effect of lithium ion transport

Inactive Publication Date: 2019-11-22
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the complete electrochemical process involved in the charge and discharge of lithium-ion batteries includes two important processes, electron conduction and ion transport, both of which are indispensable, and any process that is blocked will affect the entire charge and discharge process
Therefore, the improvement of the energy density and power performance of the battery by unilaterally improving the electronic conductivity of the pole piece is also limited.

Method used

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  • Lithium ion battery pole piece, preparation method thereof and lithium ion battery
  • Lithium ion battery pole piece, preparation method thereof and lithium ion battery
  • Lithium ion battery pole piece, preparation method thereof and lithium ion battery

Examples

Experimental program
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Effect test

specific Embodiment approach 1

[0026] A lithium-ion battery positive sheet, comprising a positive current collector 1, a first paste layer 2 and a second paste layer 3, the first paste layer 2 is coated on one surface of the positive current collector 1, the first Two paste layers 3 are coated on the surface of the first paste layer 2, and the first paste layer 2 includes uniformly dispersed positive electrode active materials, conductive agents, binders and metal fibers, and the second paste layer 3 includes uniformly dispersed positive electrode active material, conductive agent, binder and fast ion conductor material.

[0027] Further, the thickness of the first paste layer is between 5-300 μm; preferably, the thickness of the first paste layer is between 5-150 μm.

[0028] Further, the thickness of the second paste layer is between 5-300 μm; preferably, the thickness of the second paste layer is between 5-150 μm.

[0029] Further, the total thickness of the first paste layer and the second paste layer ...

specific Embodiment approach 2

[0041] A lithium-ion battery negative electrode sheet, comprising a current collector 1, a first paste layer 2 and a second paste layer 3, the first paste layer 2 is coated on one surface of the negative electrode current collector 1, and the second The paste layer 3 is coated on the surface of the first paste layer 2, and the first paste layer 2 includes a uniformly dispersed negative electrode active material, a conductive agent, a binding agent and metal fibers, and the second paste layer 3 It includes uniformly dispersed negative electrode active material, conductive agent, binder and fast ion conductor material.

[0042] Further, the thickness of the first paste layer is between 5-300 μm; preferably, the thickness of the first paste layer is between 5-150 μm.

[0043] Further, the thickness of the second paste layer is between 5-300 μm; preferably, the thickness of the second paste layer is between 5-150 μm.

[0044] Further, the total thickness of the first paste layer ...

specific Embodiment approach 3

[0057] A lithium-ion battery positive plate, comprising a current collector 1, a first paste layer 2 and a second paste layer 3, the first paste layer 2 is coated on both surfaces of the positive current collector 1, the first Two paste layers 3 are coated on the surface of the first paste layer 2, and the first paste layer 2 includes uniformly dispersed positive electrode active materials, conductive agents, binders, metal fibers, and the second paste layer 3 includes uniformly dispersed positive electrode active material, conductive agent, binder and fast ion conductor material.

[0058] Further, the thickness of the first paste layer is between 5-300 μm; preferably, the thickness of the first paste layer is between 5-150 μm.

[0059] Further, the thickness of the second paste layer is between 5-300 μm; preferably, the thickness of the second paste layer is between 5-150 μm.

[0060] Further, the total thickness of the first paste layer and the second paste layer is between...

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Abstract

The invention provides a lithium ion battery pole piece, a preparation method thereof and a lithium ion battery. The invention belongs to the technical field of lithium-ion batteries. The lithium ionbattery pole piece comprises a current collector, a first paste coating layer and a second paste coating layer, wherein at least one surface of the current collector is coated with the first paste coating layer, the surface of the first paste coating layer is coated with the second paste coating layer; the first paste coating layer comprises an active material, a conductive agent, a binder and metal fibers, which are uniformly dispersed; the second paste coating layer comprises an active material, a conductive agent, a binder and a fast ion conductor material, which are uniformly dispersed. The metal fibers are added into the first paste coating layer located on the inner layer of the pole piece, and the fast ion conductor material is added into the second paste coating layer located on the outer layer of the pole piece, so that the electronic conductivity and the lithium ion transmission performance of the pole piece can be improved at the same time, and the energy density and the power performance of the battery are improved to the maximum extent.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a lithium ion battery pole piece, a preparation method thereof and a lithium ion battery. Background technique [0002] Lithium-ion batteries have the characteristics of high energy density, long cycle life and environmental friendliness, and are widely used in electronic products such as mobile communication equipment, notebook computers, digital cameras, etc., and have broad application prospects in the field of new energy vehicles and energy storage . The current positive (negative) pole pieces of lithium-ion batteries all adopt the following preparation method: first mix the positive (negative) active material with a conductive agent, a binder and a solvent to form a slurry, and then apply the slurry to the positive ( Negative) electrode current collector is placed on and dried, and finally rolled and compacted. [0003] However, the market demands...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/131H01M4/133H01M4/134H01M4/136H01M4/1391H01M4/1393H01M4/1395H01M4/1397H01M4/04H01M10/0525
CPCH01M4/0404H01M4/043H01M4/131H01M4/133H01M4/134H01M4/136H01M4/1391H01M4/1393H01M4/1395H01M4/1397H01M4/62H01M4/624H01M4/626H01M10/0525Y02E60/10
Inventor 赵伟李素丽唐伟超袁号李俊义徐延铭
Owner ZHUHAI COSMX BATTERY CO LTD
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