Self discharge curves

For purposes of verifying of the concept of a self-discharge due to the LEM oxidation by air, we have designed a coin cell with a zinc electrode and a thin PANI/TEG cathode. The typical curves of voltage change for such electrochemical device are given by Figure 6. 

Figure 6. The galvanostatic discharge curves and self-charge curve for Zn-Air coin battery with PANI/TEG gas-diffusion electrode.

Figure 1.18 Mixed potential between discharge of the lead electrode and hydrogen evolution with the result of self discharge. The dashed curve represents reduced hydrogen overvoltage. Um mixed potential, ii, I2. rate of self discharge...

Figure 14.20 shows the behavior of AA cells on continuous low-rate discharge at 25°C. The discharge curve is very flat at these low-current drains, but capacity loss below the 2.4 Ah rating occurs below the 1000-hour rate due to parasitic self-discharge. 

The discharge properties of these solid-state batteries are characterized by high practical energy densities, low-rate capability, and low rates of self-discharge. From the linear polarization curve (Fig. 15.3) it is apparent that the resistance is essentially ohmic. Bridge measurements of cell resistance at 1 kHz are in agreement with values determined from polarization curves. 

The digital electronics can also estimate discharge time using similar calibration tables based on the discharge curves and other relevant data. This information is then displayed as lighted LEDs or communicated over a serial bus to electronics in the laptop eomputer, for example, for display or control of the device. A typical set of calibration curves is shown in Fig. 29.23. It shows the values used to calculate the charge lost (self-discharge) as a... 

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