TY - JOUR
T1 - Monitoring and quantifying morphological and structural changes in electrode materials under operando conditions
AU - Fehse, Marcus
AU - Hogan, Matteo P.
AU - Pang, Sally Hiu Tung
AU - Blackman, Oliver
AU - Kelder, Erik M.
AU - Longo, Alessandro
AU - Alfredsson, Maria
PY - 2020
Y1 - 2020
N2 - X-ray absorption and small-angle x-ray scattering spectra were simultaneously acquired under operando conditions in a joined technique approach, for the first time applied in the field of energy storage materials. This approach allows one to closely follow the electronic and local structure evolution, as well as monitor and quantify the morphological and nanostructural changes occurring during electrochemical cycling. Here we demonstrate its potential on the example of doped and non-doped Fe2O3 anode material vs. Li. Our results reveal that upon discharge Fe3+ is gradually reduced to the metallic state and segregated as nanoparticles. For the relithiation reaction, upon subsequent charge, we observe improved reversibility for the Sr-doped compared to non-doped and Ca-doped Fe2O3. We highlight that this combined technique approach is a reliable, facile and powerful tool to investigate electrode materials under realistic cycling condition. It provides an unbiased and holistic picture of the morphological and structural changes occurring during operation, which allows for adequate material tailoring.
AB - X-ray absorption and small-angle x-ray scattering spectra were simultaneously acquired under operando conditions in a joined technique approach, for the first time applied in the field of energy storage materials. This approach allows one to closely follow the electronic and local structure evolution, as well as monitor and quantify the morphological and nanostructural changes occurring during electrochemical cycling. Here we demonstrate its potential on the example of doped and non-doped Fe2O3 anode material vs. Li. Our results reveal that upon discharge Fe3+ is gradually reduced to the metallic state and segregated as nanoparticles. For the relithiation reaction, upon subsequent charge, we observe improved reversibility for the Sr-doped compared to non-doped and Ca-doped Fe2O3. We highlight that this combined technique approach is a reliable, facile and powerful tool to investigate electrode materials under realistic cycling condition. It provides an unbiased and holistic picture of the morphological and structural changes occurring during operation, which allows for adequate material tailoring.
KW - Conversion reaction
KW - FeO
KW - Operando characterization
KW - Small-angle x-ray scattering
KW - X-ray absorption spectroscopy
UR - http://www.scopus.com/inward/record.url?scp=85090032545&partnerID=8YFLogxK
U2 - 10.1016/j.jpowsour.2020.228685
DO - 10.1016/j.jpowsour.2020.228685
M3 - Article
AN - SCOPUS:85090032545
SN - 0378-7753
VL - 478
JO - Journal of Power Sources
JF - Journal of Power Sources
M1 - 228685
ER -