1 research outputs found
Controlled Crystallization of Carbon-blended Prussian Blue Analogs for Advanced Sodium-Ion Batteries
Prussian blue analogs (PBAs) are a potential choice for
cathodes
in sodium-ion batteries. However, their electrochemical performance
is hindered by intrinsic structural vacancies and weak electronic
conductivity, resulting in a reduced reversible capacity, multiplicative
ability, and cycle stability. Herein, the carbon-blended Na2CoFe(CN)6 (COHCF@C) prepared by a controlled crystallization
method displays improved electrochemical characteristics. With 70%
residual capacity after 200 cycles, the reversible specific capacity
of the COHCF@C is 123 mAh g–1 at 1 C. Furthermore,
the COHCF@C also exhibits higher structural stability in aqueous electrolytes.
Based on experimental results, this enhancement can be attributed
to the introduction of carbon, slowing down the crystallization process
and resulting in higher crystallinity. Additionally, the reduced water
content leads to fewer defects, which improves the utilization of
active sites. Overall, the finding provides an experimental basis
and theoretical guidance for the application of PBA cells