Cathode

Iron-Based Phosphate Cathodes For Practical Na-Ion Batteries

Cathode

Iron-Based Phosphate Cathodes For Practical Na-Ion Batteries

Progress in sustainable sodium iron phosphates makes them a contender among Na-ion cathodes The high chemical and cycling stability of polyanionic cathodes makes them attractive candidates for Na-ion batteries over layered oxide and Prussian blue analogue alternatives. In particular, iron-based phosphates comprised of abundant and sustainable elements stand out as cost-effective materials. A review by Liu et. al. summarizes the research progress on this class of cathodes, highlighting improvements in energy density through new compositions. Mixed iron phosphate-pyrophosphate chemistries are currently the most promising cathodes in this materials class, with Na4Fe3(PO4)P2O7 and Na3Fe2(PO4)P2O7 compositions reaching 110-125 mAh/g capacities, and showing operational lifetimes in the thousands of cycles. However, further improvements in energy density, conductive coatings, and presodiation techniques are needed for this class of cathodes to match the performance of lithium iron phosphate.

Mixed sodium iron phosphate polyanionic cathodes are cheap and abundant with decent capacities and high stability, allowing them to compete with layered oxides and Prussian blue analogues.

Academia | P. 209 Source: Y. Liu, X. Cui, Y. Liu, Y. Xia, and Liu, Z., Cao, Y., Zhang, H., Xu, J., Wang, N., Zhao, D., Li X., Liu, Y., Zhang J.

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