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Preparation method for lithium battery anode slurry doped with tin powder

A negative electrode slurry, lithium battery technology, applied in electrode manufacturing, battery electrodes, circuits, etc., can solve the performance impact of pole piece lithium battery, long-term treatment of conductive agent, equipment requirements and high wear and tear, and improve capacity performance. , to ensure cycle stability, the effect of low production energy consumption

Inactive Publication Date: 2015-12-30
田东
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Problems solved by technology

This method first requires a long time for the dispersion of the conductive agent, which takes a long time and the dispersion state is not ideal, especially for the preparation of the slurry using carbon nanotubes (CNT), graphene, etc. as the conductive agent; secondly, the traditional process requires During the slurry preparation process, the stirring system is kept in a vacuum state, causing the internal temperature of the slurry system to rise easily, and at the same time, circulating water is added to the outside for cooling, so the requirements and wear on the equipment are very high
The above results in low slurry preparation efficiency, poor stability, and unsatisfactory effects, which will affect the preparation of subsequent pole pieces and the performance of lithium batteries.

Method used

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  • Preparation method for lithium battery anode slurry doped with tin powder

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Embodiment 1

[0029] Artificial graphite is used as the negative electrode active material, SP is the conductive agent, and the particle size of nano-Sn is 50nm. According to the mass ratio of graphite: Sn: CMC: SBR = 94.0: 3.0: 1.5: 2.0: 2.5, the solvent deionized water is the above-mentioned each group 100% of the total amount. The preparation steps are as follows:

[0030] 1. Add the thickener CMC into the deionized water solvent, dissolve it evenly with a mixer, take it out for use, and the time is 60 minutes;

[0031] 2. Add the negative electrode active material, nano-tin, and conductive agent into the mixing tank to stir and disperse for 30 minutes, and scrape the powder on the stirring blade and the barrel at the time of 15 minutes and 30 minutes;

[0032] 3. Add 55% of the total amount of the thickener solution to the above stirred powder, stir and disperse for 60 minutes, and scrape the stirring blade and the barrel on the time of 20 minutes, 40 minutes and 60 minutes Slurry, th...

Embodiment 2

[0042] Natural graphite is used as the negative electrode active material, SP is the conductive agent, and the particle size of nano-Sn is 50nm. According to the mass ratio of graphite: Sn: SP: CMC: SBR = 94.5: 7.0: 2.0: 1.6: 1.9, the solvent deionized water is the above 80% of the total amount of each component. The preparation steps are as follows:

[0043] 1. Add the thickener CMC into the deionized water solvent, dissolve it evenly with a mixer, take it out for use, and the time is 120 minutes;

[0044] 2. Add the negative electrode active material, nano-tin, and conductive agent into the mixing tank to stir and disperse for 40 minutes, and scrape the powder on the stirring blade and the barrel at the time of 20 minutes and 40 minutes;

[0045] 3. Add 60% of the total amount of thickener solution to the above stirred powder, stir and disperse for 70 minutes, and scrape the stirring blade and the barrel at 23 minutes, 46 minutes and 70 minutes Slurry, the temperature of t...

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Abstract

The invention discloses a preparation method for lithium battery anode slurry doped with tin powder. By adding nanometer tin powder in the conventional anode slurry preparation process, the capacity playing performance of the material is improved, and the requirements of a lithium ion battery for the high-energy density can be met; in addition, through the steps of thickening agent solution preparing, powder body dispersing, high-viscosity stirring, low-viscosity stirring, viscosity testing, vacuum defoaming and the like, all the components, especially the nanometer tin powder, are fully dispersed in an anode system, agglomeration of the nanometer tin powder is avoided, and the cycling stability is guaranteed. The preparation method has the advantages of being short in preparation time, little in equipment wear, low in production energy consumption, good in dispersion effect and the like. The lithium battery prepared by adopting the anode slurry is low in internal resistance, high in volume energy density and good in cycling performance.

Description

technical field [0001] This patent relates to the field of lithium-ion batteries, specifically a preparation method for nano-tin powder-doped lithium battery negative electrode slurry. Background technique [0002] At present, with the shortage of global oil resources and the continuous deterioration of the climate environment, the development of human society is facing severe challenges. The development of clean and energy-saving new energy vehicles is highly valued by countries all over the world. The key to the development of new energy vehicles lies in their power sources. Lithium-ion batteries have the advantages of high energy density, small self-discharge, no memory effect, wide operating voltage range, long service life, and no environmental pollution. They are currently the main power source for new energy vehicles. [0003] The rapid development of lithium-ion batteries is mainly due to the contribution of electrode materials, especially the progress of negative ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/1393
CPCH01M4/04H01M4/1393Y02E60/10
Inventor 田东
Owner 田东
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