Highly Reversible Lithiation of Additive Free T‐Nb 2 O 5 for a Quarter of a Million Cycles

• Published in: Advanced functional materials Vol. 34; no. 18
• Main Authors: Wechsler, Sean Cade, Gregg, Alexander, Stefik, Morgan
• Format: Journal Article
• Language: English
• Published: 01-05-2024
• ISSN: 1616-301X; 1616-3028
• DOI: 10.1002/adfm.202312839

Fast energy storage via intercalation requires quick ionic diffusion and often results in pseudocapacitive behavior. The cycling stability of such energy storage materials remains understudied despite the relevance to lifetime cost. Orthorhombic niobium oxide (T‐Nb
2
O
5
) is a rapid ion intercalation material with a theoretical capacity of 201.7 mAh g
−1
(Li
2
Nb
2
O
5
) and good cycling stability due to the minimal unit cell strain during (de)intercalation. Prior reports of T‐Nb
2
O
5
cycling between 1.3–3.1 V versus Li/Li
+
noted a 50% loss in capacity after 10 000 cycles. Here, cyclic voltammetry is used to identify the role of the voltage window, state of charge, and potentiostatic holds on the cycling stability of mesoporous T‐Nb
2
O
5
thin films. Films cycled between 1.2–3.0 V versus Li/Li
+
without voltage holds (Li
1.1
Nb
2
O
5
) exhibited extreme cycling stability with 90.8% capacity retention after 0.25 million cycles without detectable morphological/crystallographic changes. In contrast, the inclusion of 60 s voltage holds (Li
2.18
Nb
2
O
5
) led to rapid capacity loss with 61.6% retention after 10 000 cycles with corresponding X‐ray diffraction evidence of amorphization. Cycling with other limited voltage windows identifies that most crystallographic degradation occurs at higher extents of lithiation. These results reveal remarkable stability over limited conditions and suggest that T‐Nb
2
O
5
amorphization is associated with high extents of lithiation.