Canrd Blog

Creating Avenues for New Research Development

Lithium ion full battery production process–Coating

Coating Basics

Purpose: To uniformly coat a fluid slurry onto the surface of a metal foil, dry it, and produce a battery electrode
Principle: The coating roller rotates to carry the slurry, and the amount of slurry transferred is adjusted by adjusting the gap between the blade and the roller. The relative rotation of the back roller and the coating roller is used to transfer the slurry onto the substrate. Subsequently, the solvent in the slurry is evaporated through drying and heating, causing the solid matter to adhere to the substrate.

Common Coating Methods

Coating Process

Note: The cathode slurry typically uses NMP as a solvent.
Therefore, a NMP recovery device is added to the drying system during the coating process

Coating Mechanism

Note: Taking transfer coating as an example

Control Points:
(1)Liquid Level of Slurry in Hopper (Liquid Level Control)
(2)Temperature of Slurry During Coating Process (Constant Temperature)
(3) Blade Gap
(4)Coating Speed
(5)Speed Ratio Between Coating Roller and Back Roller

Drying System

Control Points for the Drying Process:
(1)Coating Speed
(2)Temperature Control of Each Oven
(3)Air Nozzle Blowing Speed

Common Issues:
(1)Electrode Cracking
(2)Elecrtode Curling
(3)Incomplete Drying of Electrode
(4)Electrode Delamination

Tab Coating Method

Commonly Used Foil Materials:
Positive Tab Aluminum Foil:9~16um
Negative Electrode Copper Foil:6~12um
Due to specific needs, carbon-coated copper foil or aluminum foil may also be used for the copper and aluminum foil.

Currently, there are two main types of coating methods: continuous and intermittent coating Coating Width: less than 650mm
Maximum Coating Speed: 70 meters per minute (m/min)

Transfer Coating

Extrusion Coating

Monitoring Methods

To maintain the consistency of the produced electrode, important parameters that need to be controlled during the coating process include:
1,Coating Weight(weighing,online x-ray,β-ray monitoring)
2,Coating Dimension(flexible tape measure,micrometer,online optical fiber measurement)
3,Coating Appearance(visual inspection,electrode adhesion test)

Monitoring is typically carried out using the aforementioned methods

Company introduction

Welcome to Canrd Company (Canrd stands for “Creating Avenues for New Research Development”,website: ). We specialized in:

  1. Electrochemical experiment consumables, including coin cell cases, cathodes, anodes, electrodes, electrolytes, and various other materials.
  2. Battery cell research and development outsourcing, offering Custom-made electrodes, dry cells, finished battery cells, and battery cell testing.
  3. Test line equipment, such as coin cell equipment lines, pouch cell test lines, cylindrical cell test lines, and more.

We have strong research and development capabilities.If you are interested, please feel free to contact us at any time.
Phone:+86 19867737979

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