In:
Nature Communications, Springer Science and Business Media LLC, Vol. 13, No. 1 ( 2022-07-14)
Abstract:
Polyanion compounds offer a playground for designing prospective electrode active materials for sodium-ion storage due to their structural diversity and chemical variety. Here, by combining a NaVPO 4 F composition and KTiOPO 4 -type framework via a low-temperature (e.g., 190 °C) ion-exchange synthesis approach, we develop a high-capacity and high-voltage positive electrode active material. When tested in a coin cell configuration in combination with a Na metal negative electrode and a NaPF 6 -based non-aqueous electrolyte solution, this cathode active material enables a discharge capacity of 136 mAh g −1 at 14.3 mA g −1 with an average cell discharge voltage of about 4.0 V. Furthermore, a specific discharge capacity of 123 mAh g −1 at 5.7 A g −1 is also reported for the same cell configuration. Through ex situ and operando structural characterizations, we also demonstrate that the reversible Na-ion storage at the positive electrode occurs mostly via a solid-solution de/insertion mechanism.
Type of Medium:
Online Resource
ISSN:
2041-1723
DOI:
10.1038/s41467-022-31768-5
Language:
English
Publisher:
Springer Science and Business Media LLC
Publication Date:
2022
detail.hit.zdb_id:
2553671-0
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