1 research outputs found
Structure and Electrochemical Properties of Bronze Phase Materials Containing Two Transition Metals
Bronze phase transition-metal oxides
have recently attracted attention
as high-rate lithium-ion battery anode materials. Their crystal structures
are distinguished by large tunnels and an open framework, facilitating
lithium-ion diffusion and high-rate chargeādischarge properties.
The presence of two transition metals also offers a route to achieve
high energy density from multielectron redox. In this paper, we report
the chemistry, structure, and electrochemical properties of two different
bronze phase compositions having the same stoichiometry: W3Nb2O14 and Mo3Nb2O14. These materials provide insight into how the transition
metals affect the electrochemical behavior and structural stability
of bronze phase materials. Mo3Nb2O14 exhibits greater than 1 electron redox per transition metal leading
to lithium capacities above 200 mAh gā1 at C/2 but
is unable to maintain this high capacity at high rates due to incomplete
Mo redox reactions. In contrast, W3Nb2O14 exhibits reversible redox reactions and retains its open
structure on cycling. This study highlights the potential of bronze
phase materials containing two transition metals to exhibit fast charging
properties with a high energy density