Chemically Reduced Organic Small-Molecule-Based Lithium
Battery with Improved Efficiency
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Abstract
Organic lithium batteries are attractive
because of the possibility
of fabricating lightweight and flexible devices. However, the organic
lithium batteries have a few drawbacks. The specific capacity is usually
lower than the theoretical capacity, which further decreases upon
cycling. Often, the specific capacity is very low compared to theoretical
capacity while discharging the battery at moderate and high <i>C</i> rates. To circumvent this issue, we chemically reduced
carboxylic acid functionality substituted perylene diimide (benzoic-PDI)
with hydrazine. Indeed, we found that the rate of redox reaction as
well as the conductivity of the benzoic-PDI increased upon chemical
reduction. The battery comprising reduced benzoic-PDI exhibits 100%
Coulombic efficiency and specific capacity while discharging at 20<i>C</i>. The battery also exhibits very high specific energy (213
Wh/kg) and specific power (8548 W/kg). The control experiments confirm
our hypothesis of using chemical reduction to improve the performance
of organic lithium battery