Supercapacitors Material Methods’ PACMM™-100 electrodes were evaluated for
electrochemical capacitor performance using 38% Sulfuric Acid
electrolyte in sealed test cells. Measurements show DC capacitance
values of 112 F/g. Leakage current behavior is characteristic
of devices exhibiting stable long-timed performance. The calculated
RC time constant value was less than 0.1 seconds. A phase angle
of -45 degrees was reached at 2.3 Hz (a large value for a carbon
electrode with a thickness of only .010”). Figure Of Merit
(FOM) values for the material were 22.6 W/g and 9.2 W/cc based
only on electrode volume and mass. If one includes the electrolyte,
separator, and packaging mass and volume, the values would be
reduced to 5-7 W/g, and 4-7 W/cc respectively for large capacitors
(this is a high value for present commercial electrochemical capacitors).
Test results demonstrate that the material has average or above
average energy density, and exceptional power density. 
| |
Leakage
Current ( A) |
| Capacitor Material |
R( ) |
Charging Capacitance(F) |
0.5V |
0.75V |
1.0V |
Equil. at 1V |
Specific C (F/g) |
| PACMM-100 |
0.068 |
1.13 |
7.6 |
21.1 |
98.9 |
9.1 |
112 |
Independent testing of PACMM™-100 supercapacitor electrodes was
done by JME, Inc. Water Purification Material Methods electrodes developed for the Flow Through Capacitor
enabled the technology to purify molarities up to 0.65. The yellow
square shows where the technology started: Max Molarity Molarity 95% purified 
|
