Abstract
To provide energy densities higher than those of conventional Li-ion batteries, a Li–O2 battery requires a cathode with high surface area to host large amounts of discharge product Li2O2.
Highlights
Li–O2 batteries (o en referred to as Li–air batteries) have attracted considerable interest due to their high theoretical speci c energy ($3500 W h kgÀ1), which is 5–10 times that of conventional Li-ion batteries ($380 W h kgÀ1).[1,2] the practical application of Li–O2 batteries is not yet seen, due to many scienti c and technological challenges
A binder-free oxygen electrode consisting of a 3-D graphene structure on aluminum foam, with a high defect level (ID/IG 1⁄4 1.38), was directly used as the oxygen electrode in Li– O2 batteries, delivering a high capacity of about 9 Â 104 mA h gÀ1 at the first full discharge using a current density of 100 mA ggrapheneÀ1
The G band in graphene oxide (GO) is located at 1606 cmÀ1, while for graphene foam (GF), the G band moves to 1595 cmÀ1 (Table 1), which is close to the value of commercial graphite
Summary
Li–O2 batteries (o en referred to as Li–air batteries) have attracted considerable interest due to their high theoretical speci c energy ($3500 W h kgÀ1), which is 5–10 times that of conventional Li-ion batteries ($380 W h kgÀ1).[1,2] the practical application of Li–O2 batteries is not yet seen, due to many scienti c and technological challenges. 3-D binder-free graphene foam as a cathode for high capacity Li–O2 batteries
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