Monitoring and quantifying morphological and structural changes in electrode materials under operando conditions

JOURNAL OF POWER SOURCES

卷:478

Article

Fehse, Marcus^1,2,3  Hogan, Matteo P.⁴  Pang, Sally Hiu-Tung⁴  Blackman, Oliver⁴  Kelder, Erik M.^1,3  Longo, Alessandro^5,6  Alfredsson, Maria^3,4 

[1] Delft Univ Technol, Fac Sci Appl, Delft, Netherlands

[2] CIC Energigune, Parque Tecnol Alava,Albert Einstein 48, Minano, Spain

[3] Univ Picardie Jules Verne, Alistore European Res Inst, 33 Rue St Leu, F-80039 Amiens, France

[4] Univ Kent, Sch Phys Sci, Canterbury CT2 7NH, Kent, England

[5] ESRF European Synchrotron, F-38043 Grenoble 9, France

[6] Ist Studio Mat Nanostrutturatti ISMN CNR, UOS Palermo, Via Ugo La Malfa 153, I-90146 Palermo, Italy

关键词: Conversion reaction;    Small-angle x-ray scattering;    X-ray absorption spectroscopy;    Operando characterization;    Fe2O3;   

DOI  :  10.1016/j.jpowsour.2020.228685

来源: Elsevier

【 摘 要 】

X-ray absorption and small-angle x-ray scattering spectra were simultaneously acquired under operando condi-tions 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.

【 授权许可】

Free