ORCID Profile
0000-0002-2645-7442
Current Organisation
University of South Carolina
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Publisher: Wiley
Date: 25-09-2019
Publisher: Royal Society of Chemistry (RSC)
Date: 2012
DOI: 10.1039/C1JM14113A
Publisher: Wiley
Date: 21-04-2022
Abstract: Intercalation pseudocapacitance is a faradaic electrochemical phenomenon with high power and energy densities, combining the attractive features of capacitors and batteries, respectively. Intercalation pseudocapacitive responses exhibit surface‐limited kinetics by definition, without restriction from the collective of diffusion‐based processes. The surface‐limited threshold (SLT) corresponds to the maximum voltage sweep rate ( v SLT ) exhibiting a predominantly surface‐limited current response prior to the onset of diffusion‐limitations. Prior studies showed increased lithium diffusivity for amorphous titania compared to anatase. Going beyond prior binary comparisons, here a continuum of amorphous titania configurations were prepared using a series of calcination temperatures to tailor both amorphous character and content. The corresponding amorphous‐phase v SLT increased monotonically by 317 % with lowered calcination temperatures. Subsequent isomorphic comparisons varying a single transport parameter at a time identified solid‐state lithium diffusion as the dominant diffusive constraint. Thus, performance improvements were linked to increasing the lithium diffusivity of the amorphous phase with decreased calcination temperature. This remarkably enabled 95 % capacity retention (483±17 C/g) with 30 s of delithiation (120 C equivalent). These results highlight how isomorphic s le series can reveal previously unidentified trends by reducing ambiguity and reiterate the potential of amorphization to realize increased performance in known materials.
Publisher: Wiley
Date: 15-06-2022
Publisher: American Chemical Society (ACS)
Date: 12-12-2022
Location: United States of America
No related grants have been discovered for Morgan Stefik.