Anode slurry of high-rate lithium ion battery and fabrication method of anode slurry

A technology of lithium ion battery and positive electrode slurry, which is applied in battery electrodes, mixing methods, chemical instruments and methods, etc., can solve the problems of not easy to stir too fast, improve material dispersibility, large specific surface area of ​​conductive agent, etc. The effect of high rate discharge performance, lower production cost and shorter mixing time

Active Publication Date: 2013-04-10
SHANDONG GOLDENCELL ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The conductive agent with excellent electrical conductivity has a large specific surface area, is not easy to disperse, and cannot improve the dispersibility of the material by reducing the solid content of the slu

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 2.0kg binder PVDF (U.S. Solef PVDF5130), 3.0kg conductive agent carbon nanotubes (Carbon Nanotube TNCC, Chinese Academy of Sciences Chengdu Organic Chemistry Co., Ltd.), 45kg rate-type lithium iron phosphate active material (made by Haite Electronics Group Co., Ltd. Lithium iron phosphate material) is mixed with a V-type mixer VH-100 (Nanjing Kedixin Machinery Equipment Co., Ltd.), the speed is 10±1r / min, and the mixing time is 3h. Then put the mixed raw materials into the blast oven and bake at 85±5°C for 10 hours, turn off the heating and let the mixed raw materials cool down to below 45°C for later use, add 92.8kg NMP to a 200L double planetary power mixer (Guangzhou Hongyun Mixing Equipment Co., Ltd. ) into the mixing tank, then add the mixed raw materials into the mixing tank of the double planetary power mixer three times and stir evenly. Add about 1 / 3 of the mixed raw materials each time. After adding the mixed raw materials, stir at a low speed for 5 minutes befo...

Embodiment 2

[0024]2.5kg binder PVDF (French Arkema PVDF HSV900), 1.0kg conductive agent carbon nanotubes (Carbon Nanotubes TNCC, Chinese Academy of Sciences Chengdu Organic Chemistry Co., Ltd.), 1.5kg Ketjen Black (Japan LION Company ECP), 45kg rate type The lithium iron phosphate active material (made by Haite Electronics Group Co., Ltd.) was mixed with a V-type mixer VH-100 (Nanjing Kedixin Machinery Equipment Co., Ltd.), with a speed of 10±1r / min and a mixing time of 4h. Then put the mixed raw materials into the blast oven and bake at 85±5°C for 10 hours, turn off the heating and let the mixed raw materials cool down to below 45°C for later use, add 116.7kg NMP to a 200L double planetary power mixer (Guangzhou Hongyun Mixing Equipment Co., Ltd. ) into the mixing tank, then add the mixed raw materials into the mixing tank of the double planetary power mixer three times and stir evenly. Add about 1 / 3 of the mixed raw materials each time. After adding the mixed raw materials, stir at a low...

Embodiment 3

[0026] 3.0kg binder PVDF (French Arkema PVDF761A), 1.0kg conductive agent carbon nanotubes (Carbon Nanotubes TNCC of Chengdu Organic Chemistry Co., Ltd., Chinese Academy of Sciences), 1.5kg superconducting carbon black Ensaco 350G (Switzerland Temigo), 44.5 The kg rate type lithium iron phosphate active material (made by Haite Electronics Group Co., Ltd.) was mixed with a V-type mixer VH-100 (Nanjing Kedixin Machinery Equipment Co., Ltd.), with a speed of 10±1r / min and a mixing time of 3h. Then put the mixed raw materials into the blast oven and bake at 85±5°C for 10 hours, turn off the heating and let the mixed raw materials cool down to below 45°C for later use, add 88.9kg NMP to a 200L double planetary power mixer (Guangzhou Hongyun Mixing Equipment Co., Ltd. ) into the mixing tank, then add the mixed raw materials into the mixing tank of the double planetary power mixer three times and stir evenly. Add about 1 / 3 of the mixed raw materials each time. After adding the mixed r...

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PUM

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Abstract

The invention discloses anode slurry of a high-rate lithium ion battery and a fabrication method of the anode slurry. The fabrication method comprises the steps of mixing a binder, a conductive agent and a lithium iron phosphate active substance uniformly at a mass ratio of 1:(0.8-1.2):(18-23) with a mixer at a rotating speed of 19-21r/min for 2-4h, adding the uniformly mixed raw materials into an air blowing oven for baking at 80-90 DEG C for 8-12h, turning off the air blowing oven, cooling the mixed raw materials naturally to below 45 DEG C for use, adding the raw materials into a stirring barrel containg NMP (N-Methyl Pyrrolidone) in three times, stirring with a planetary stirrer, controlling the solid content of the slurry to be 30%-40%, stirring for 5-10min at a low speed and 1-1.5h at a high speed when the mixed raw materials are added in the first time and the second time, stirring for 5-10min at the low speed and 2-3h at the high speed when the mixed raw materials are added in the third time, adding NMP to adjust viscosity, controlling the viscosity to be 5000-10000MPa*s, stirring at the low speed to conduct vacuum defoaming, and filtering the slurry with a screen with 200 meshes.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a high-rate lithium ion battery cathode slurry and a preparation method thereof. Background technique [0002] Lithium iron phosphate lithium-ion battery has a wide range of application prospects in the field of power technology due to its high power density, long cycle life, good safety performance and environmental friendliness. With the continuous improvement of the performance requirements of electric tools and small power equipment for lithium-ion batteries, the performance of lithium iron phosphate lithium-ion batteries has been continuously improved. The raw materials of high-rate lithium-ion batteries require good conductivity. People usually use conductive graphite and conductive carbon black with moderate specific surface area as the positive electrode conductive agent of the battery to improve the rate energy of the battery. For the conductive...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/58B01F3/20B01F23/70
CPCY02E60/10
Inventor 张敬捧关成善宗继月
Owner SHANDONG GOLDENCELL ELECTRONICS TECH
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