A 1000 Wh/kg Li？Air Battery: Cell Design and Performance
Journal
J POWER SOURCES
Date
2019.04.15
Abstract
A 500 mAh Li？Air battery is assembled using cell components and a structure that enable the construction of the battery with increased specific energy. Carbon nanotubes are used as the cathode material so that the pore volume can be adjusted to reduce the amount of electrolyte in the cathode while maintaining high specfic capacity. The polymer ionic liquid is used in the electrolyte layer, and the combinded weight of the cathode and electrolyte layer is 5.5 mg cm-2. The cell structure, which is prepared by folding the combined layers of the Li metal/electrolyte layer/cathode reduces the weight contribution of the sealing and manifold materials. By folding the combined layers ten times, a 500 mAh Li？Air battery with dimensions of 7 cm × 1 cm × 0.23 cm is constructed. The battery yields an areal capacity of 3.6 mAh cm-2 and a specific capacity of 4400 mAh gcarbon-1, and the resulting specific energy and energy density are 1070 Wh kg-1 and 740 Wh L-1, respectively. The battery is able to cycle seven times at 500 Wh kg-1 before an abrupt decrease in its capacity is noted.