Products Description
Characteristic:
1. Calculate the tortuosity of the electrode by testing the EIS of the battery with symmetrical electrodes.
2. Simple assembly, automated testing and analysis, simplified operating steps, and improved testing efficiency.
3. Four-channel synchronous test.
4. McMullin Number and Tortuosity Measurement
Application:
1. Electrode tortuosity test; 2. Separator ion conductivity test
Description:
1. Creative Solution One
1.1 Creative Solution:
1) Calculate the MacMullin number of the electrode by testing the EIS of the symmetric cell.
2) Simplify assembly, automate testing and analysis processes, streamline operation steps,and enhance testing efficiency.
3) Synchronous testing across four channels.
1.2 Testing Principle:
1) Assemble symmetric batteries and conduct EIS testing.
2) As shown in the figure below, low-frequency segments of the EIS spectrum separately. The diference between the intersection of the fitting curves and the X-axis multiplied by 3 is the ionic resistance of the electrode coating.
3) Using the following formula, the MacMulin number can be calculated, This allows for the pre-evaluation of the electrochemica performance of the electrode after it is assembled into a cell. Therefore, characterization and compaison ofthe ionic conductivity of the electrode coating are particularly important.
Application Cases
Case 1. Different compaction density of cathode electrodes
Summary:
1) The consistency of ElS testing for symmetric battery of electrodes is generally good.
2) Within a certain range of compaction density, as the compaction increases, the ionic resistance/MacMullin numb also increases.
Case 2. Different compaction density of anode electrodes
Summary:
1) The consistency of ElS testing for symmetric battery of electrodes is generally good.
2) Within a certain range of compaction density, as the compaction increases, the ionic resistance/MacMullin numb also increases.
Case 3. The correlation between electrode tortuosity and electrochemical performance(Gr anode electrodes of different thicknesses)
Summary:
1) As the thickness of the electrode increases, its tortuosity also increases, However, the rate performance of the battery decreases with increasing thickness.
2) This indicates that the rate performance of the battery decreases with increasing tortuosity. There is a certain correlation between electrode tortuosity and rate performance of battery.
Case 4. Different coated separators(Ionic conductivity testing of four different coated separators)
Summary:
1) Test the EIS of 1-4 layers of separators to obtain R1, R2, R3, R4.
2) Plot a curve with the number of separator layers as the x-axis and separator resistance as the y-axis. Calculate the slope and linear fitting degree of the curve, with the linear fitting degree ≥0.99.
3) Calculate the separator ionic conductivity according to the formula.
Case 5. Correlation between the tortuosity of the electrode and its electrochemical performance in different electrolytes
Summary:
1) MacMullin number Ranking: Formula 2＜ Formula 1＜ Formula 3
2) Capacity retenuation Ranking(10C): Formula 2(93.92%) ＞ Formula 1(90.55%)＞ Formula 3(89%)
Case 6. Tortuosity & Wettability of LFP Cathodes with Different Compaction Densities
Summary：
1) Electrode with poorer wettability exhibit greater tortuosity.
2) As compaction density increases, electrolyte absorption declines, hindering permeation and lithium-ion migration, which elevates ion transport resistance and electrode tortuosity.
Technical Parameters
识别结果
| Model | EIC1400M | EIC2400M |
| No. of Channels | 4 | |
| Auxiliary Equipment | Glove box required for assembly of symmetrical cells | No other auxiliary equipment required |
| EIS Test Range | 100k~0.01 Hz | 100k~0.01 Hz |
| Pressure Range | 10kg-50kg | |
| Applicable Samples | Cathode & Anode Electrodes + Separator | |
| Applicable Samples | Electrodes’diameter:16mm-22mm Separators’diameter:20mm-24mm Customization Accepted | Electrodes’diameter:16mm-22mm Separators’diameter:20mm-24mm Customization Accepted |
| Test Parameters | lonic Conductivity, McMullin Number,etc | Air pressure, dew point,ionic conductivity, McMullin number,etc |
| Functions & Features | lonic conductivity and McMullin number; The software interface displays the test curve and can fit the EIS curve to obtain parameters such as; | lonic conductivity and Mc number Automatic ventilation ensures a high-purity argon environment in the chamber; Automatic electrolyte injection Multi-channel rapid assembly of symmetrical cells and testing of EIS spectra; The software interface displays the test curve and can fit the EIS curve to obtain parameters such as ; |
