Description
1. Creative Solution One
1.1 Creative Solution:
- Calculate the MacMullin number of the electrode by testing the EIS of the symmetric cell.
- Simplify assembly, automate testing and analysis processes, streamline operation steps,and enhance testing efficiency.
- Synchronous testing across four channels.
1.2 Testing Principle:
- Assemble symmetric batteries and conduct EIS testing.
- 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.
- 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.
2. Creative Solution Two
Applications
Case 1. Different compaction density of positive electrodes
Summary:
- The consistency of ElS testing for symmetric battery of electrodes is generally good.
- Within a certain range of compaction density, as the compaction increases, the ionic resistance/MacMullin numb also increases.
Case 2. Different compaction density of negative electrodes
Summary:
- The consistency of ElS testing for symmetric battery of electrodes is generally good.
- 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 negative electrodes of different thicknesses)
Summary:
- As the thickness of the electrode increases, its tortuosity also increases, However, the rate performance of the battery decreases with increasing thickness.
- 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:
- Test the EIS of 1-4 layers of separators to obtain R1, R2, R3, R4.
- 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.
- Calculate the separator ionic conductivity according to the formula.
Video
Specifications
