Power battery electrode and manufacturing method thereof

A power battery and electrode technology, applied in the field of power battery electrodes and their preparation, can solve the problems that the cycle life and stability are not as good as the oil system, the production environment requirements are high, and the electrodes are not too large, and the high rate performance is improved, and the process is stable. , the effect of reducing contact

Inactive Publication Date: 2011-06-22
CHANGZHOU HECO NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Over the years, the electrode manufacturing process has not made much progress: one is an oil-based process using NMP as a solvent and PVDF or PTFE as a binder. This process is the most mature, with stable product performance and good cycle performance, but the internal resistance Large, high requirements on the production environment, improper treatment will cause pollution; the other is a process that uses water as a solvent and polymer solution or emulsion as a binder. This process has low cost, no pollution, and low internal resistance of the product. , high-rate performance is good, but the cycle life and stability are not as good as the oil system, which needs to be further improved; there is also a process using conductive polymers as the binder, which has extremely harsh production conditions and is still in the research stage

Method used

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  • Power battery electrode and manufacturing method thereof

Examples

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Effect test

Embodiment 1

[0029] First acetylene black and deionized water were ball milled in a ball mill for 3 hours, then polyoxyethylene (accounting for 1% of the total solid content) and chloroprene rubber emulsion (accounting for 2% of the total solid content) were ball milled for 0.5 hour, and the slurry After removing air bubbles, apply it on the aluminum foil sheet, dry and roll it for later use, and the thickness of the conductive layer is 15 μm; PVDF is made into a 7% solution (accounting for 5% of the final solid content) with NMP, and then the conductive agent ( account for 5% of the final solids content), adopt high-speed shearing to disperse for 3 hours, then add lithium iron phosphate (accounting for 90% of the final solids content), adopt high-speed shearing to disperse for 3 hours, vacuumize and stir after 1 hour, and The slurry is evenly coated on the aforementioned aluminum foil, and the pole piece is dried by a large amount of hot air circulation at 110°C. Roll the dried pole piece...

Embodiment 2

[0032] First superconducting conductive carbon black and deionized water were ball milled in a ball mill for 4 hours, then sodium carboxymethylcellulose (accounting for 0.5% of the total solid content) and chlorosulfonated polyethylene rubber emulsion (accounting for 2.5% of the total solid content) were added. %) ball mill for 1 hour, remove the air bubbles from the slurry, and apply it on the copper foil, then dry it and roll it for later use. The thickness of the conductive layer is 10 μm; Make a 6% solution (accounting for 4% of the final solid content), then add a conductive agent (accounting for 6% of the final solid content), use high-speed shear to disperse for 3 hours, and then add molybdenum dioxide MoO 2 (accounting for 90% of the final solid content), use high-speed shearing to disperse for 2.5 hours, vacuumize and stir for 0.5 hours, apply the slurry evenly on the aforementioned copper foil, and use a large amount of hot air circulation at 100°C to dry the pole pie...

Embodiment 3

[0034] First conductive carbon black and deionized water were ball milled in a ball mill for 2 hours, then polyacrylonitrile (accounting for 1.5% of the total solid content) and nitrile rubber emulsion (accounting for 2.5% of the total solid content) were ball milled for 1 hour, and the slurry The material is coated on the copper foil after removing air bubbles, and is used after drying and rolling. The thickness of the conductive layer is 20 μm; PVDF is made into a 5% solution with dimethylacetamide (accounting for 4% of the final solid content) , then add conductive agent (accounting for 2% of final solid content), adopt high-speed shear dispersion for 2.5 hours, then add natural graphite (account for final solid content 94%), adopt high-speed shear dispersion for 3 hours, vacuumize and stir After 0.5 hours, the slurry was evenly coated on the aforementioned copper foil, and the pole piece was dried by using a large amount of hot air circulation at 90°C. Roll the dried pole ...

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Abstract

The invention relates to the technical field of rechargeable lithium ion batteries, in particular to a high-performance power battery electrode and a manufacturing method thereof. The manufacturing method is suitable for manufacturing pole pieces of a positive electrode and a negative electrode of a rechargeable lithium ion battery. The manufacturing method comprises the following steps of: coating a conductive layer without lithium storage activity on a metal foil by a water-based process first and then coating a material with the lithium storage activity on the metal foil by using an oil-system formula to obtain a power battery electrode after drying and rolling the conductive layer. The electrode manufacturing method utilizes the advantages of high acting force and low internal resistance of the water-based process and metal, utilizes the characteristics of stable process and long cycle life of the oil-system formula, reduces the using amount of a bonding agent, can greatly improve the high-rate performance and the cycle life of the battery, and is an ideal power battery electrode manufacturing method.

Description

technical field [0001] The invention belongs to the field of secondary lithium ion batteries, relates to the fields of electrochemistry and material chemistry, in particular to a power battery electrode and a preparation method thereof. technical background [0002] The problem of energy crisis and environmental degradation has become increasingly serious in recent years and has attracted global attention. According to the current world oil consumption rate, the global oil reserves will be exhausted in about 60 years. In addition, the rate of world oil consumption is still increasing year by year. At present, the global car ownership is on the rise, and the entire industry consumes about 45% of the total oil extraction. The dependence of traditional automobiles on oil is also the most fundamental cause of global warming. Reducing the auto industry's dependence on oil has become the fastest, most environmentally friendly and cheapest way for mankind to solve the energy cri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/139H01M4/62H01M4/70
CPCY02E60/122Y02E60/12Y02E60/10
Inventor 夏圣安李新宏杨万光
Owner CHANGZHOU HECO NEW ENERGY TECH CO LTD
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