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Manufacturing method of bipolar electrode and battery

A technology of bipolar electrodes and manufacturing methods, applied in bipolar electrodes, electrode manufacturing, active material electrodes, etc., can solve problems such as overvoltage and waste of volume energy density, achieve continuity, avoid overvoltage and volume energy The wasteful effect of density

Active Publication Date: 2021-01-29
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The same type of active material is coated on both sides of the current collector, and the slurry and compaction of the same active material have similar requirements and properties, so the same system solvent is used in the coating process, and the deformation force and solvent influence during the evaporation process are all acceptable. Accepted; during the rolling process, the compaction and the compaction density of the material itself and the required consistency also minimize the impact on the deformation of the pole piece, but in the bipolar electrode, the upper and lower sides are different types of active materials, The types of solvents used in the paste coating process are different, and they are prone to mutual influence during coating and baking. Especially during rolling, due to inconsistent rolling coefficients, rolling on the side with a larger rolling coefficient is likely to cause overpressure , Rolling on the side with a smaller rolling coefficient is likely to cause a waste of volumetric energy density

Method used

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  • Manufacturing method of bipolar electrode and battery
  • Manufacturing method of bipolar electrode and battery
  • Manufacturing method of bipolar electrode and battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] See figure 1 , a method for making bipolar electrodes, which specifically includes the following steps:

[0026] (1) The copper-aluminum composite tape is used as the bipolar current collector, the thickness of the positive electrode conductive layer 11 aluminum is 10um, the thickness of the negative electrode conductive layer 12 copper is 4.5um, and the positive electrode is coated on the Al side surface of the bipolar current collector. NCM slurry 13 with a mass percentage of 96% active material and a solid content of 73% was dried at 100°C and then rolled, with a compacted density of 3.4g / cm 3 ;

[0027] (2), using a copper mesh as the auxiliary current collector 14, coating one side of the auxiliary current collector 14 with a graphite slurry 15 with a negative active material mass percentage of 95% and a solid content of 53%, and then drying at 100 ° C Rolled after drying, compacted density 1.7g / cm 3 ;

[0028] (3), coat the conductive adhesive layer 16 on the ...

Embodiment 2

[0032] See image 3 , a method for making bipolar electrodes, which specifically includes the following steps:

[0033] (1) The porous vapor-deposited composite current collector that is conducted by the conductive filling layer is used as a bipolar current collector, wherein 0.5um of conductive carbon black 17 conducts 500nm copper (negative electrode conductive layer 12) and 700nm aluminum (positive electrode conductive layer 11) ), between the negative electrode conductive layer 12 and the positive electrode conductive layer 11 is a porous support layer 18, and the Al side surface of the bipolar current collector is coated with a positive electrode active material mass percentage of 96% and a solid content of 73% NCM slurry 13 , and then dried at 100°C and then rolled, with a compacted density of 3.4g / cm 3 ;

[0034] (2), using a copper mesh as the auxiliary current collector 14, coating one side of the auxiliary current collector 14 with a graphite slurry 15 with a negat...

Embodiment 3

[0038] See figure 1 , a method for making bipolar electrodes, which specifically includes the following steps:

[0039] (1) The copper-aluminum composite tape is used as the bipolar current collector, the thickness of the positive electrode conductive layer 11 aluminum is 10um, the thickness of the negative electrode conductive layer 12 copper is 4.5um, and the positive electrode is coated on the Al side surface of the bipolar current collector. NCM slurry 13 with a mass percentage of 96% active material and a solid content of 73% was dried at 100°C and then rolled, with a compacted density of 3.4g / cm3 ;

[0040] (2) Using porous PET as the auxiliary current collector 14, coating one side of the auxiliary current collector 14 with a graphite slurry 15 with a negative active material mass percentage of 95% and a solid content of 53%, and then baked at 100°C Rolled after drying, compacted density 1.7g / cm 3 ;

[0041] (3), coat the conductive adhesive layer 16 on the Cu side s...

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Abstract

The invention discloses a manufacturing method of a bipolar electrode and a battery, which comprises the following steps of: coating slurry consisting of a positive active material on one side surfaceof a bipolar current collector, coating slurry consisting of a negative active material on one side surface of an auxiliary current collector, separately drying and rolling, and coating a conductiveadhesive on the other side of the bipolar current collector, and compounding the auxiliary current collector with the conductive adhesive to form the bipolar electrode. According to the manufacturingmethod of the bipolar electrode, the positive and negative active substances are separately rolled, and the rolled positive and negative active substances are bonded together through the conductive adhesive, so that overvoltage and volume energy density waste are avoided, and the continuity of electrode manufacturing can also be realized.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular to a bipolar electrode and a method for manufacturing the battery. Background technique [0002] The same type of active material is coated on both sides of the current collector, and the slurry mixing and compaction of the same active material have similar requirements and properties. Therefore, when the same solvent is used in the coating process, the deformation force of the evaporation process and the influence of the solvent can be Acceptable; the consistency of the compaction density and the requirements of the compaction and the material itself during the rolling process also minimizes the impact on the deformation of the pole piece, but in the bipolar electrode, the upper and lower sides are different types of active materials, The types of solvents used in the slurry coating process are different, and it is easy to interact with each other during coating and baking. Especia...

Claims

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Application Information

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IPC IPC(8): H01M4/1391H01M4/1393H01M4/04H01M4/02H01M10/0587H01M10/052
CPCH01M4/1391H01M4/1393H01M4/0404H01M4/0433H01M4/02H01M10/0587H01M10/052H01M2004/029Y02E60/10Y02P70/50
Inventor 任明秀许涛王晓燕王磊牛亚如
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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