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Lithium ion battery and positive electrode slurry stirring method therefor

A lithium-ion battery and cathode slurry technology, which is applied in battery electrodes, secondary batteries, mixer accessories, etc., can solve the problems of large particle size of cathode slurry, the capacity and service life of lithium batteries need to be improved, and the dispersion performance is poor. Achieve the effect of improving dispersibility, convenient operability, economical and practical value, and improving production qualification rate and consistency

Inactive Publication Date: 2019-08-23
HENAN FUSEN NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The lithium battery positive electrode slurry prepared by the above method is used to make lithium batteries, which has a certain capacity retention rate and cycleability, but the positive electrode slurry has the defects of large particle size, poor dispersion performance, lithium battery capacity and service life. Life expectancy needs to be improved

Method used

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  • Lithium ion battery and positive electrode slurry stirring method therefor

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Effect test

Embodiment 1

[0028] Preparation of positive electrode slurry and positive electrode sheet of lithium battery: the positive electrode active material is used as the positive electrode active material with a mass ratio of nickel-cobalt lithium manganese oxide: lithium iron phosphate: lithium manganate, and its weight content is 96.4%; Ethylene (PVDF molecular weight 1.3 million) is used as the binder, and its weight content is 1.6%; carbon black and carbon nanotubes are used as the conductive agent, and its weight content is 1% and 1% respectively. Dry mix the above materials with a stirring speed of 30HZ, disperse at 200rpm, stir for 2 hours evenly, add the solvent methyl pyrrolidone (NMP), turn on the mixer and set the circulating water constant temperature system to 45-55°C, and use a stirring speed of 40HZ , Disperse and stir at 2000rpm for 4 hours to make positive electrode slurry evenly, and lower to normal temperature to test the solid content, viscosity and fineness of the slurry. Th...

Embodiment 2

[0034] Preparation of positive electrode slurry and positive electrode sheet of lithium battery: the positive electrode active material is used as the positive electrode active material with a mass ratio of nickel-cobalt lithium manganese oxide: lithium iron phosphate: lithium manganate, and its weight content is 96.4%; Ethylene (PVDF molecular weight 1.3 million) is used as the binder, and its weight content is 1.6%; superconducting carbon black and carbon nanotubes are used as the conductive agent, and its weight content is 1% and 1% respectively. The above materials are mixed by dry mixing at a stirring speed of 30HZ, dispersed at 200rpm, stirred for 1.5 hours, and the solvent methyl pyrrolidone (NMP) is added, and the circulating water constant temperature system of the mixer is set to 55-65°C, and the stirring speed is 40HZ, Disperse and stir at 2000rpm for 3.0 hours to uniformly make positive electrode slurry, and lower to room temperature to test the solid content, visco...

Embodiment 3

[0040] Preparation of positive electrode slurry and positive electrode sheet of lithium battery: the positive electrode active material is used as the positive electrode active material with a mass ratio of nickel-cobalt lithium manganate: lithium iron phosphate: lithium manganate, and its weight content is 96.4%; Ethylene (PVDF molecular weight 1.3 million) is used as the binder, and its weight content is 1.6%; carbon black and carbon nanotubes are used as the conductive agent, and its weight content is 1% and 1% respectively. Dry mix the above materials with a stirring speed of 30HZ, disperse at 200rpm, stir for 1.5 hours evenly, add the solvent methyl pyrrolidone (NMP), turn on the mixer and set the circulating water constant temperature system to 65-75°C, and use a stirring speed of 40HZ , Disperse at 2000rpm and stir for 2.5 hours to evenly make positive electrode slurry, and lower to normal temperature to test the solid content, viscosity and fineness of the slurry. The ...

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Abstract

The invention provides a lithium ion battery and a positive electrode slurry stirring method therefor, and belongs to the technical field of lithium ion batteries. The positive plate of the lithium battery comprises a positive current collector and positive slurry coated on the positive current collector, wherein the positive electrode slurry contains a positive electrode active substance, a conductive agent and a binder; the positive electrode active substance is a mixture of lithium nickel cobalt manganate, lithium iron phosphate and lithium manganite; a mixer circulating water temperature control regulating system comprises a temperature frequency conversion regulating switch and a circulating water heating system in the stirring process of the positive electrode slurry of the lithium ion battery, and the circulating water temperature of the circulating water heating system is set to be 45-75 DEG C. The dispersity of the lithium battery positive electrode slurry is improved, the stirring time is shortened, the production qualification rate and the consistency of the lithium batteries are improved, and the lithium battery positive electrode slurry has higher convenience and operability and economic and practical values.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a lithium ion battery and a method for stirring positive electrode slurry thereof. Background technique [0002] At present, compared with nickel-hydrogen and nickel-cadmium batteries, lithium-ion batteries are in the leading position in the 3C (computer, communication, consumer electronics) field with absolute advantages; at the same time, in order to meet the requirements of energy conservation and environmental protection, electric vehicles (including electric bicycles and electric vehicles) Automobile) has a broad market prospect. As a power source for electric vehicles, lithium-ion batteries are very competitive. Regardless of the 3C electronic consumer field or the electric vehicle application field, due to the high requirements for power supply energy, batteries must be used in parallel and in series in a certain way. The use of batteries in gro...

Claims

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Application Information

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IPC IPC(8): H01M4/139H01M4/1391H01M4/1397H01M10/0525B01F15/00B01F15/06
CPCH01M4/1397H01M4/1391H01M4/139H01M10/0525B01F35/2215B01F35/90B01F2035/99Y02E60/10
Inventor 曹长城曹成群张晓伟唐正果王改香
Owner HENAN FUSEN NEW ENERGY TECH
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