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Title: Morphology and Crystallinity Effects of Nanochanneled Niobium Oxide Electrodes for Na-Ion Batteries

Journal Article · · ACS Nanoscience Au
 [1];  [1];  [2];  [3];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1]; ORCiD logo [1]
  1. Boise State Univ., ID (United States)
  2. Boise State Univ., ID (United States); Idaho National Laboratory (INL), Idaho Falls, ID (United States)
  3. Boise State Univ., ID (United States); Argonne National Laboratory (ANL), Argonne, IL (United States)

Niobium pentoxide (Nb2O5) is a promising negative electrode for sodium ion batteries (SIBs). By engineering the morphology and crystallinity of nanochanneled niobium oxides (NCNOs) the kinetic behavior and charge storage mechanism of Nb2O5 electrodes were investigated. Amorphous and crystalline NCNO samples were made by modulating anodization conditions (20 - 40V and 140 - 180 °C) to synthesize nanostructures of differing pore sizes and wall thicknesses with identical chemical composition. The electrochemical energy storage properties of the NCNOs were studied with the amorphous samples showing better overall rate performance than the crystalline samples. The enhanced rate performance of the amorphous samples is attributed to the higher capacitive contributions and Na-ion diffusivity analyzed from cyclic voltammetry (CV) and galvanostatic intermittent titration technique (GITT). It was found that the amorphous samples with smaller wall thicknesses facilitated improved kinetics. Among samples with similar pore size and wall thickness, the difference in their power performance stems from crystallinity effect, which plays a more significant role in the resulting kinetics of the materials for Na-ion batteries.

Research Organization:
Idaho National Laboratory (INL), Idaho Falls, ID (United States); Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF); National Science Foundation (NSF)
Grant/Contract Number:
AC07-05ID14517; AC02-06CH11357; DMR-1950305; DMR-1454984; DMR-1838604
OSTI ID:
2293541
Report Number(s):
INL/JOU-23-74873-Rev.000; TRN: US2408934
Journal Information:
ACS Nanoscience Au, Vol. 4, Issue 1; ISSN 2694-2496
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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