Electric
vehicles and hybrid electric vehicles require batteries
with higher energy densities than conventional batteries. Anion redox-type
active materials have been proposed as new high-capacity positive
electrode materials for Li-ion batteries with high-energy densities.
Co-substituted Li
5
AlO
4
is a novel and promising
high-capacity positive electrode material for Li-ion batteries. In
this study, we investigated the influence of different synthesis conditions
on the enhancement of the specific capacity. The material prepared
via mechanical alloying of β-Li
5
AlO
4
with
LiCoO
2
at 300 rpm for 24 h exhibited a higher specific
capacity than that prepared from α-Li
5
AlO
4
and LiCoO
2
. Co-substituted β-Li
5
AlO
4
demonstrated a specific capacity of approximately 250 mA
h g
–1
. The specific capacity of Co-substituted α
and β-Li
5
AlO
4
increased with increasing
Co content in the samples. According to X-ray absorption near edge
structure measurements, the irreversible oxygen redox reaction and
a reversible reaction involving the formation and consumption of peroxide
were responsible for the charge compensation of Co-substituted β-Li
5
AlO
4
and α-Li
5
AlO
4
,
respectively.
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