A preparation method of molybdenum disulfide negative electrode slurry for battery and its product and application

A technology of molybdenum disulfide and negative electrode slurry, which is applied to battery electrodes, secondary batteries, electrochemical generators, etc., can solve the problems affecting the continuity of electrode slurry and waste of active materials, and achieve good battery consistency and improved Efficiency of use, method is simple and reliable

Active Publication Date: 2020-06-19
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally, the negative electrode slurry such as molybdenum disulfide is filtered to remove the aggregates or undispersed dry material in the slurry after the slurry stirring process, which not only causes a waste of active materials, but also affects the preparation of the entire electrode slurry. continuity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Weighing by mass ratio, active material (molybdenum disulfide), conductive agent (conductive graphite sp and ks-6, and the mass ratio is 1:1) and binder (polyvinylidene fluoride, namely PVDF), account for the total 25% of the mass; the solvent is N-methylpyrrolidone (also known as NMP), accounting for 75% of the total mass. The mass ratios of active material, conductive agent and binder in the solute are 90%, 5% and 5%, respectively. Pour PVDF into 2 / 3 of the mass of NMP, and stir it slowly through magnetic stirring until it becomes a transparent jelly. During the stirring process, seal the container to prevent the volatilization of NMP. Add sp, ks-6 and molybdenum disulfide to the above jelly in 3-4 times, try to stir the situation, add the remaining 1 / 3 mass of NMP in batches, the stirring speed is 2000 r / min, and the stirring time is 5 hours, vacuumize in the last hour of the stirring process to eliminate the air bubbles generated during the stirring process. The s...

Embodiment 2

[0024] Weighing by mass ratio, active material (molybdenum disulfide), conductive agent (conductive graphite sp and ks-6, and the mass ratio is 1.5:1) and binder (polyvinylidene fluoride, namely PVDF), account for the total 27% of the mass; the solvent is N-methylpyrrolidone (also known as NMP), accounting for 73% of the total mass. The mass ratios of active material, conductive agent and binder in the solute are 93%, 3.5% and 3.5%, respectively. Pour PVDF into 2 / 3 of the mass of NMP, and stir it slowly through magnetic stirring until it becomes a transparent jelly. During the stirring process, seal the container to prevent the volatilization of NMP. Add sp, ks-6 and molybdenum disulfide to the above jelly in 3-4 times, try to stir the situation, add the remaining 1 / 3 mass of NMP in batches, the stirring speed is 2500 r / min, and the stirring time is 4 hours, in the last hour of the stirring process, carry out vacuum treatment to eliminate the air bubbles generated during the ...

Embodiment 3

[0026] Weighing by mass ratio, active material (molybdenum disulfide), conductive agent (conductive graphite sp and ks-6, and the mass ratio is 2:1) and binder (polyvinylidene fluoride, namely PVDF), accounting for the total 30% of the mass; the solvent is N-methylpyrrolidone (also known as NMP), accounting for 70% of the total mass. The mass ratios of active material, conductive agent and binder in the solute are 95%, 2.5% and 2.5%, respectively. Pour PVDF into 2 / 3 of the mass of NMP, and stir it slowly through magnetic stirring until it becomes a transparent jelly. During the stirring process, seal the container to prevent the volatilization of NMP. Add sp, ks-6 and molybdenum disulfide to the above jelly in 3-4 times, try to stir the situation, add the remaining 1 / 3 mass of NMP in batches, the stirring speed is 3000 r / min, and the stirring time is For 3 hours, carry out vacuum treatment in the last hour of the stirring process to eliminate the air bubbles generated during ...

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Abstract

The invention provides a preparation method of MoS2 negative electrode paste for a battery and a product and application thereof. A solute comprises 90-95wt% of active substance MoS2, 2.5-5wt% of conductive agent being conductive graphite sp and ks-6 and 2.5-5wt% of binding agent polyvinylidene fluoride (PVDF), the solute accounts for 25-30% of total paste mass, a solvent is N-methyl pyrrolidone (NMP) and accounts for 70-75% of the total paste mass, and the mass ratio of sp and sk-6 is (1:1)-(2:1). The preparation method comprises the steps of pouring the PVDF into the NMP in an amount of second third of mass, adding the sp, the ks-6 and the MoS2, and performing micro nanocrystallization on the stirred paste to obtain the MoS2 negative electrode paste which is microcosmically and favorablydispersed. The MoS2 negative electrode paste is not needed to be filtered, the usage efficiency of the active substance is improved, and the whole preparation process also has continuity. The methodis simple and reliable and is good in process repeatability and high in maneuverability, and the prepared signal battery is high in consistency.

Description

technical field [0001] The invention relates to a method for preparing a molybdenum disulfide negative electrode slurry for batteries, in particular to a molybdenum disulfide negative electrode slurry for batteries, a preparation method and application thereof. Background technique [0002] As a new type of chemical power source, compared with traditional batteries, lithium-ion batteries have the advantages of high discharge voltage, small self-discharge, and no memory effect, and are widely used in information, electronics, transportation, national defense and military fields. An ideal lithium-ion battery anode material should have high specific capacity and small structural and volume changes during lithium intercalation and delithiation. At present, silicon-based, germanium-based, and tin-based materials have attracted much attention due to their high theoretical capacity, but these materials will produce a large volume expansion during the process of lithium intercalatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M4/136H01M10/0525
CPCY02E60/10
Inventor 何丹农段磊王艳丽吴晓燕李敏金彩虹
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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