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Earlier-stage dispersion processing method for electrode raw materials of lithium ion battery

A lithium-ion battery, dispersion treatment technology, applied in the field of lithium-ion batteries, can solve the problems of re-agglomeration, general dispersion performance, battery capacity loss, etc., and achieve the effect of simple operation steps, good dispersion quality, and high-quality agglomeration

Inactive Publication Date: 2018-02-06
OPTIMUM BATTERY CO LTD
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  • Summary
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The dispersion performance of mechanical stirring dispersion is average, the timeliness of stirring dispersion is not long and once the stirring effect is removed, the powder may re-agglomerate; the problem of ultrasonic vibration dispersion is that once the ultrasonic vibration is stopped, it is still possible to re-agglomerate the ultrafine powder , after a period of ultrasonic treatment, the particle size cannot be further reduced, and continued ultrasonication will re-agglomerate the ultrafine powder; the dispersant plays an important role in regulating the dispersibility of the ultrafine powder, but the amount of the dispersant should be controlled It is very difficult, too much or too little can not achieve a good dispersion effect, and may even agglomerate the ultrafine powder, and the addition of a dispersant will cause a decrease in the proportion of active substances (such as lithium iron phosphate), resulting in a loss of battery capacity

Method used

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  • Earlier-stage dispersion processing method for electrode raw materials of lithium ion battery
  • Earlier-stage dispersion processing method for electrode raw materials of lithium ion battery
  • Earlier-stage dispersion processing method for electrode raw materials of lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Embodiment 1, the early stage dispersion treatment method of lithium ion battery electrode raw materials of the present invention comprises the following steps:

[0028] (1) Weighing: Weigh a certain amount of LFP powder;

[0029] (2) Electrostatic dispersion: pass the weighed powder through a set of electrostatic dispersion device to charge the powder with the same charge: firstly, the above weighed powder is vibrated and dispersed by the feeder and then enters the electrostatic dispersion chamber. In this embodiment, the vibration frequency of the vibration motor used is 30 Hz; then the powder entering the electrostatic dispersion chamber is charged with the same charge by the charging device in the electrostatic dispersion chamber and then enters the powder collection chamber. During this process, The voltage of the adjustable high-voltage power supply is 10KV;

[0030] (3) Ingredients: the powder after electrostatic dispersion treatment, glue solution and NMP solve...

Embodiment example 2

[0033] Implementation case 2, the early stage dispersion treatment method of lithium ion battery electrode raw materials of the present invention comprises the following steps:

[0034] (1) Weighing: Weigh LFP powder, KS-6 powder and SP powder with a certain mass ratio;

[0035] (2) Electrostatic dispersion: Mix the weighed powders and pass a set of electrostatic dispersion device to charge the powders with the same charge: firstly, the weighed powders are vibrated and dispersed by the feeder and then enter the electrostatic dispersion bin , in this embodiment, the vibration frequency of the vibration motor used is 55Hz; then the powder entering the electrostatic dispersion chamber is charged with the same charge by the charging device in the electrostatic dispersion chamber and then enters the powder collection chamber. Among them, the voltage of the adjustable high-voltage power supply is 45KV;

[0036] (3) Ingredients: The powder after electrostatic dispersion treatment, p...

Embodiment 3

[0040] Embodiment 3, the early stage dispersion treatment method of lithium ion battery electrode raw materials of the present invention comprises the following steps:

[0041] (1) Weighing: Weigh KS-6 and SP powders according to a certain mass ratio;

[0042](2) Electrostatic dispersion: Mix the weighed powders and pass a set of electrostatic dispersion device to charge the powders with the same charge: firstly, the weighed powders are vibrated and dispersed by the feeder and then enter the electrostatic dispersion bin , in this embodiment, the vibration frequency of the vibration motor used is 80Hz; then the powder entering the electrostatic dispersion bin is charged with the same charge by the charging device in the electrostatic dispersion bin and then enters the powder collection bin. Among them, the voltage of the adjustable high-voltage power supply is 80KV;

[0043] (3) Ingredients: the powder after electrostatic dispersion treatment, glue solution and NMP solvent wer...

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Abstract

The invention provides an earlier-stage dispersion processing method for electrode raw materials of a lithium ion battery. The earlier-stage dispersion processing method comprises the following steps:firstly, weighing materials: weighing one or more series of LFP, KS-6 and SP powder with certain mass; secondly, carrying out electrostatic dispersion: mixing the weighed powder, and then enabling the powder to take the same charge through a set of electrostatic dispersing device; thirdly, blending: adding a glue solution and an NMP solvent into the collected powder, and carrying out mechanical stirring to obtain cathode / anode paste. Compared with the prior art, the earlier-stage dispersion processing method disclosed by the invention has the advantages that by combining with the coulomb theorem principle and using one set of simple electrostatic device, ultrafine powder with higher quality and low possibility of agglomeration is obtained. Hence, the earlier-stage dispersion processing method disclosed by the invention has the characteristics of simple operation procedures, better dispersing quality and higher speed; in addition, the prepared electrode plate can meet the performance requirements of the lithium battery more easily.

Description

【Technical field】 [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a method for early-stage dispersion treatment of lithium-ion battery electrode raw materials. 【Background technique】 [0002] As a new type of green energy, lithium-ion batteries have been widely used in energy storage systems such as 3C / 3G mobile phones, notebook computers, and electric vehicles in recent years due to their unique properties such as high capacity, long cycle life, and no memory effect. The wide range of applications makes people have higher requirements for the cost performance of lithium batteries. How to reduce the cost of lithium batteries and improve the performance of lithium batteries is an urgent technical problem that needs to be solved. [0003] Lithium iron phosphate battery has quickly become an ideal product in the lithium battery field due to its good safety performance, wide range of raw material sources, and low price. However, it...

Claims

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Application Information

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IPC IPC(8): H01M4/04H01M10/0525B01F11/00
CPCH01M4/04H01M10/0525B01F31/50B01F33/052Y02E60/10
Inventor 杨国龙杨斌斌许辉饶睦敏李瑶
Owner OPTIMUM BATTERY CO LTD
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