Dataset on a primary battery cell with a ferroelectric Li-glass electrolyte

Published: 2 February 2020| Version 1 | DOI: 10.17632/rydhf7j4vj.1
Contributor:
Maria Helena Braga

Description

The data attached is a comparison between the commercial CR1616 Li-MnO2 cell and Li/Li-glass (Li2.99Ba0.005ClO) in cellulose/gamma-MnO2+C/Al pouch-cell. Although the LED determines the potential profile, the potential is a response to the input current. Therefore, the variable discharge current and potential profiles are useful to determine the maximum current output of a battery cell as well as the standard discharge current and the cell profile. As observed in I vs t data for the commercial cell, the cell’s maximum current is 13 mA and the standard discharge current plateaus below 100 uA when the cell is almost fully discharged (83% = first day). Moreover, the extended plateau for the commercial cell varies from 100 uA to approximately 16.5 uA; most of the capacity of the cell is obtained in the first 30 hrs of discharge (94%). The pouch-cell with 16.2 mg of active cathode material was discharged at room temperature inside an air-filled glove box; it shows a specific capacity of 764 mAh/g-gamma MnO2 (for a theoretical capacity of 209 mAh/g-gamma MnO2), which is higher than the 308 mAh/g of the commercial cell, obtained after discharging it for 11.2 months with a green LED lit uninterruptedly (see Data). It is observed that the profiles for the current in the commercial and pouch-cell differ substantially; while the commercial cell varies its output current from 13 mA to 95 uA in two days and finally to 0.16 uA in more 5 days (the LED was not lit from day 6th with 14 hrs to day 7th with 2 hrs), the Li-glass pouch-cell varies its output current from 1 mA to 17 uA in one day and then to 2 uA in 59 days and it remains lit for 334 days. The data for the commercial cell is divided by the ratio between commercial and pouch-cell active cathodes (13.3) showing a maximum current of 0.977 mA, a plateau from 7.52 to 1.24 uA which compare to Imax = 1.01 mA, plateau from 32 to >=1.24 uA for 4.3 months of the FEB. The coin cell is a 3D cell as the electrolyte wets all cathode powders and the pouch is a 1D cell (only the surface in contact with the Li-glass is effective) and, therefore, the previous calculations are just approximations. The discharge of the commercial cell with the green LED was used as a control method. The capacity determined by this method agrees with the capacity in the corresponding technical spreadsheet. The profile of the green LED used was also determined accurately.

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