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Preparation process of lithium battery negative electrode plate formula

A preparation process and technology of negative electrode sheet, which is applied in the field of preparation process of lithium battery negative electrode sheet formula, can solve problems such as uneven SP dispersion, SP splashing, pitting, etc., and achieve the effect of avoiding black spots and pitting, and avoiding splashing

Active Publication Date: 2018-03-09
JIAN UTILITY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in the current process of preparing the slurry for the negative electrode sheet of lithium batteries, the conductive agent SP is not soaked, resulting in uneven dispersion of the SP, splashing of the SP during the stirring process, and black spots and pitting during the coating process.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] In embodiment 1, select second kind of formula for use, wherein, satisfy SP:NMP:H 2 O=1:5:6, the weight of graphite is 33 kg.

[0036] Batching process: Pour NMP into the emulsifier, then add H 2 Add O to it and start stirring for 8Min, let the two mix well, then add the required SP and stir for 8Min, and let it stand for 10Min to allow the SP to fully mix and moisten.

[0037] Coating is carried out on the second day after the batching is completed, the coating effect is consistent with the current soaking process, and there are no black spots or pitting on the surface; at the same time, by mixing NMP and H 2 O increases the amount of solvent, effectively wets the SP during stirring, and avoids splashing of SP during stirring.

Embodiment 2

[0039] In embodiment 2, select the first formula for use, wherein, satisfy SP:NMP:H 2 O=1:10:5, the weight of graphite is 25 kg.

[0040] Batching process: Pour NMP into the emulsifier, then add H 2 Add O to it and start stirring for 8Min, let the two mix well, then add the required SP and stir for 8Min, and let it stand for 10Min to allow the SP to fully mix and moisten.

[0041] Coating is carried out on the second day after the batching is completed, the coating effect is consistent with the current soaking process, and there are no black spots or pitting on the surface; at the same time, by mixing NMP and H 2 O increases the amount of solvent, effectively wets the SP during stirring, and avoids splashing of SP during stirring.

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Abstract

The invention discloses a preparation process of a lithium battery negative electrode plate formula. The preparation process is characterized by including steps: (1) pouring NMP into an emulsifying machine, adding a certain quantity of H2O into the emulsifying machine, and stirring for 5-10min to well mixing NMP with H2O; (2) adding needed SP into the emulsifying machine, and stirring for 5-10min;(3) standing for 8-10min to enable complete mixing and wetting of SP, wherein NMP refers to N-methyl pyrrolidone, H2O refers to water, and SP refers to a conductive agent. The preparation process ofthe lithium battery negative electrode plate formula has advantages that dark spots and pock marks in a coating process can be eliminated, and splattering of SP in a preparation process of the lithiumbattery negative electrode plate formula is avoided.

Description

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

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583H01M4/62H01M10/0525
CPCH01M4/583H01M4/62H01M4/621H01M4/624H01M10/0525Y02E60/10
Inventor 邓春强朱观音王继生
Owner JIAN UTILITY TECH CO LTD
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