Lithium battery positive pole piece and preparation method thereof

A positive pole piece, lithium battery technology, applied in the direction of battery electrodes, electrode manufacturing, secondary batteries, etc., can solve the problems of active coating current collector peeling off, battery failure, etc., to facilitate fixation and charge and discharge cycles, improve capacity, good synergistic effect

Pending Publication Date: 2022-08-09
南通赛得能源有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defects in the prior art that the active coating is easily peeled off from the current collector when th

Method used

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  • Lithium battery positive pole piece and preparation method thereof
  • Lithium battery positive pole piece and preparation method thereof
  • Lithium battery positive pole piece and preparation method thereof

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0053] Example 1

[0054]This embodiment provides a positive electrode plate of a lithium battery, the structure of which is as follows figure 1 As shown, it includes a current collector 1 located in the inner layer of the positive electrode sheet, and a first coating layer 2, a conductive carbon cloth layer 3 and a second coating layer 4 which are arranged symmetrically outward from both sides of the current collector in sequence.

[0055] The preparation method of the positive electrode is as follows:

[0056] 1. Preparation of composite slurry: the first conductive agent (high specific surface area porous activated carbon), the second conductive agent (carbon black), water-soluble dispersant (carboxymethyl cellulose sodium salt) and styrene-butadiene rubber emulsion (SBR) ) mix according to the mass ratio of 85:5:1:9, use deionized water as the solvent, adjust the solid content to 20wt%, use a high-speed mixer to mix to form a stable and uniform slurry, the stirring speed ...

Example Embodiment

[0062] Example 2

[0063] This embodiment provides a positive electrode plate of a lithium battery, the structure of which is as follows figure 1 As shown, it includes a current collector 1 located in the inner layer of the positive electrode sheet, and a first coating layer 2, a conductive carbon cloth layer 3 and a second coating layer 4 which are arranged symmetrically outward from both sides of the current collector in sequence.

[0064] The preparation method of the positive electrode is as follows:

[0065] 1. Preparation of composite slurry: the first conductive agent (porous activity with high specific surface area), the second conductive agent (carbon black), the water-soluble dispersant (carboxymethyl cellulose sodium salt) and the styrene-butadiene rubber emulsion (SBR) ) mix according to the mass ratio of 78:10:2:10, use deionized water as the solvent, adjust the solid content to 16wt%, use a high-speed mixer to mix to form a stable and uniform slurry, the stirrin...

Example Embodiment

[0071] Example 3

[0072] This embodiment provides a positive electrode plate of a lithium battery, the structure of which is as follows figure 1 As shown, it includes a current collector 1 located in the inner layer of the positive electrode sheet, and a first coating layer 2, a conductive carbon cloth layer 3 and a second coating layer 4 which are arranged symmetrically outward from both sides of the current collector in sequence.

[0073] The preparation method of the positive electrode is as follows:

[0074] 1. Preparation of composite slurry: the first conductive agent (high specific surface area porous activated carbon), the second conductive agent (carbon black), water-soluble dispersant (carboxymethyl cellulose sodium salt) and styrene-butadiene rubber emulsion (SBR) ) mix according to the mass ratio of 90:2:2:6, use deionized water as the solvent, adjust the solid content to 12wt%, use a high-speed mixer to mix to form a stable and uniform slurry, the stirring speed...

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Abstract

The positive pole piece comprises a current collector located on the inner layer of the positive pole piece, and a first coating, a conductive carbon cloth layer and a second coating which are sequentially and symmetrically arranged outwards from the two sides of the current collector, the first coating and the second coating comprise lithium ion active substances; the conductive carbon cloth is modified by composite slurry. The invention also provides a preparation method of the lithium battery positive pole piece and a lithium ion battery comprising the lithium battery positive pole piece. By using the conductive carbon cloth, different types of coatings can be better combined; the conductivity of the positive pole piece is improved; the tensile strength and the flexibility of the positive plate are improved; due to the constraint of the carbon cloth fibers, the active substances are not easy to fall off, more active substances and electrolyte can be accommodated, the electrolyte wettability of the active substances is better, and the capacity, the rate capability and the cycle performance of the battery are finally improved; and the safety of the battery is improved. The preparation method is simple and suitable for large-scale production.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a lithium battery positive pole piece and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the advantages of high operating voltage, high energy density, wide operating temperature range, small self-discharge, no memory effect, fast charge and discharge, and long cycle life. They are widely used in portable electronic equipment, electric vehicles, electric ships, etc. Large-scale energy storage and other fields. Among them, the current collector mainly plays the role of collecting current in the battery, providing a channel for electrons, accelerating charge transfer, and improving the charge and discharge rate. The current collector needs to have the characteristics of high electrical conductivity, light weight, high mechanical strength, low internal resistance, and low contact resistance with active materials. At present, aluminum foi...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/1397H01M4/136H01M4/131H01M4/04H01M10/0525H01M4/1391
CPCH01M4/625H01M10/0525H01M4/1397H01M4/1391H01M4/131H01M4/136H01M4/0404H01M2004/028H01M2004/021H01M2004/022Y02P70/50
Inventor 韩振周行菲利普·A·梅迪纳朱文俊周浩袁野
Owner 南通赛得能源有限公司
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