Formula of lithium battery negative electrode plate, and coating process adopting formula

A coating process and negative electrode technology, which is applied to the formulation of lithium battery negative electrodes and the coating process using the formula, can solve the problems of dry cracks, trailing, and poor flexibility of the electrodes, and prevent the sticking phenomenon , Eliminate foam phenomenon, improve the effect of flexibility

Inactive Publication Date: 2018-03-13
JIAN UTILITY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the existing lithium battery negative electrode sheet is prone to coiling when it is coated in the oven. A layer of foam is easy to appear on the surface after stirring before discharge, and the rotation of the steel roller during coating will also generate foam. The stirring rod slides left and right to make the foam concentrate on both sides and cause bubbles to appear on the edge of the pole piece. After passing through the oven The edge is light; or, the pole piece is dry and cracked, and the flexibility of the pole piece is poor

Method used

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  • Formula of lithium battery negative electrode plate, and coating process adopting formula
  • Formula of lithium battery negative electrode plate, and coating process adopting formula
  • Formula of lithium battery negative electrode plate, and coating process adopting formula

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] In the selected embodiment, formula adjustment items: 95.3 parts of HSG, 0.5 parts of water-based CNTS, 1.2 parts of CMC, 3.0 parts of LA133, 1 part of absolute ethanol, 2.0 parts of EC, 40% solid content, slurry viscosity 3759mpa.s, using an electric drill Keep stirring for 10 minutes, and the foam generated during the process will disappear quickly. By stopping the stirring of the slurry in the emulsifier, letting it stand, and then coating, the foam can be significantly reduced. In Comparative Example 1, no foam was found to float on the surface. It may be that the slurry was not stirred quickly in the emulsifier before use, but the slurry was beaten out and placed in a bucket to stand and then to be coated, but if it is not stirred It is easy to cause hard lumps or dark marks.

[0061] When coating on one side, the coating speed on one side is 8500mm / mim.

[0062] Single side coating oven set temperature:

[0063] 110℃

115℃

120℃

125℃

130℃ ...

Embodiment 2

[0080] The purpose of Example 2 is to explain that in the formula of the present invention, LA133 is used instead of SBR (styrene-butadiene latex) to solve the problem of more stable processing performance of the negative electrode sheet, and reduce or eliminate the gas bulging phenomenon.

[0081] The biggest difference in Example 2 is that compared with the existing formula, LA133 is used instead of SBR. However, during the production process, it is found that this process becomes easier to absorb water, resulting in the phenomenon of easy sticking to the roll in the subsequent process and air swelling after chemical formation. Therefore, through Under the premise of not affecting the product performance, fine-tune the dosage of LA133 in order to improve these abnormal points. The following two schemes are tested first, and at the same time, the performance of the battery cell is initially evaluated.

[0082] 1. Test the adhesion, the test results:

[0083]

[0084]

...

Embodiment 3

[0097] In this example, the percentages of each component of the formula are: 96.3 parts of HSG, 0.5 parts of water-based CNTS, 1.2 parts of CMC, 3.0 parts of LA133, 1 part of absolute ethanol, 2.0 parts of EC, a solid content of 40%, and a slurry viscosity of 4560mpa .s.

[0098] Coating procedure and effect are identical with embodiment 1.

[0099] In the roll-to-roll process, under the same oil pressure condition as in Example 1, the thickness of the pole piece is off-line, while in Example 1 it is off-line (continue to pressurize, the thickness basically does not change, but it is easy to stick to the roll) ), after fine-tuning the gap, the thickness fluctuates in the midline range, and there is no sticky roller phenomenon on the appearance of the pole piece, but there are occasional slight hard lumps on the pole piece (this is related to the dispersion effect of the ingredients). On the whole, the feel of the pole piece is softer, which is also consistent with the phenom...

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Abstract

The invention discloses a formula of a lithium battery negative electrode plate, and a coating process adopting the formula. The formula comprises the following raw materials in parts by weight: 92-97parts of HSG, 0.3-1.0 parts of water system CNTS, 0.8-1.4 parts of CMC, 1.5-3.0 parts of LA133, 110-130 parts of H20, 3-10 parts of NMP, 1-3 parts of absolute ethyl alcohol, and 2.0 plus or minus 1.0parts of EC; the solid content of the solution prepared by the formula is 39-41%, wherein the solid content refers to weight percentage of a solute in the solution when the solution is prepared by the formula; the coating process comprises the following steps of (1) performing material mixing on the components in the formula based on the weight percentages; (2) performing stirring on the configured paste liquid in an emulsifying machine, and performing standing after stirring is completed; (3) setting coating speed and drying oven temperature; (4) performing rolling; and (5) performing coating.

Description

technical field [0001] The invention relates to a formula and a method for a negative electrode sheet of a lithium battery. Background technique [0002] Lithium batteries use carbon materials as the negative electrode and lithium-containing compounds as the positive electrode. There is no lithium metal, only lithium ions. This is a lithium battery. Lithium battery refers to the general term for batteries with lithium ion intercalation compounds as positive electrode materials. For example, the Chinese invention patent with the existing publication number CN105609702A discloses "Formulation and Preparation Process of Lithium Battery Negative Electrode", the formula includes graphite, conductive agent, binder, thickener, water and current collector, graphite , conductive agent, binder and thickener are mixed to form a mixture, and the mass fraction of the mixture is 92-96% of graphite, 5-2.0% of conductive agent, 1.5-3.0% of binder, and 1.5-3.0% of thickener, Water includes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/36H01M4/587H01M4/60H01M10/0525
CPCH01M4/0404H01M4/364H01M4/587H01M4/60H01M10/0525Y02E60/10
Inventor 邓春强朱观音王继生
Owner JIAN UTILITY TECH CO LTD
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