IEST Electrolyte Wetting Testing System(EWS1100)

IEST Electrolyte Wetting Testing System – evaluate the wetting differences of different pole pieces, electrolytes, diaphragm formulations and processes

1. Principle of electrode wetting

The Lucas-Washburn infiltration model is commonly used to describe the dynamic of liquid absorption in electrode pores, as represented by the equation below, Here, ( h ) denotes the liquid absorption height, ( t ) stands forabsorption time, (c)represents the shape factor for different pore capillaries, ( r) refers to the capillary radius, ( cr ) is a constant termed as the form radius, (θ )stands for the liquid surface tension, and ( η )denotes the liquidviscosity.

2. Applications

2. Electrode electrolyte capillary wetting system-EWS

(1)Key Features

• Equipped with a high-precision vision testing system forstable and efficient testing repeatability.
• In-situ real-time characterization of electrolyte wetting rateon negative electrode sheets of lithium-ion batteries.
• Applicable Samples: Negative electrode sheets.
• The greater the compacticion of the electrode sheet, the lowerthe porosity, resulting in poorer electrolyte wetting.

(2)Application Case

• Comparison of liquid absorption heights for negative electrode sheets with different compaction densities. Four different compaction densities of electrode sheets:1 (1.35g/cm³) <2(1.5 g/cm³) <3(1.6 g/cm³)<4 (1.65 g/cm³)

(3)Model and Parameters

3. Electrode electrolyte weight immersion system-ETS

(1)sheets of lithium-ion batteries

• Equipped with a high-precision weighing system for stable and efficient testing repeatability.
• In-situ real-time characterization of electrolyte wetting rate on positive and negative electrode sheets of lithium-ion batteries.
• Test Samples: Positive electrode sheets, negative electrode sheets.
• Good overlap among the three sets of electrode sheets,indicat-ing good consistency in electrolyte wetting.

(2)Application Case

• Trimming three sets of negative electrode sheets from the same batch (65*70mm)

(3)Model and Parameters

4. Electrode Electrolyte Heightlmmersion System-CHT

(1)Key Features

• Equipped with a high-precision vision acquisition system forstable and efficient testing repeatability.
• In-situ real-time characterization of electrolyte wetting rate onpositive and negative electrode sheets oflithium-ion batteries.
• Test Samples: Positive electrodes, negative electrodes.
• Capable of simultaneous testing of 3 parallel samples, exhibit-ing good consistencyin electrolyte wetting.

(2)Model and Parameters