In situ XANES & XRD Study of interphasial reaction between uncharged Li2FeSiO4 cathode and LiPF6-based electrolyte

16th International Conference on X-ray Absorption Fine Structure

Arthur, Z.^1 ; Chiu, H.C.^2 ; Lu, X.^2 ; Chen, N.^3 ; Emond, V.^1 ; Demopoulos, G.P.^2 ; Jiang, D.T.^1

Department of Physics, University of Guelph, Guelph

ON

N1G 2W1, Canada^1

Department of Materials Engineering, McGill University, Montreal

QC

H3A 0C5, Canada^2

Canadian Light Source, Saskatoon

SK

S7N 2V3, Canada^3

关键词: Cath-ode materials;    Charging rate;    Iron oxidation state;    Lattice structures;    Lithium extraction;    Long ranges;    Spontaneous interaction;    XRD studies;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/712/1/012124/pdf
DOI  :  10.1088/1742-6596/712/1/012124

来源: IOP

【 摘 要 】

In situ synchrotron radiation XANES and XRD have been carried out on Li2FeSiO4cathode material in a lithium-ion-battery (LIB) cell. The evolution of the long range lattice structure and the local iron oxidation state has been observed at a charging rate of C/20 for the formation cycle for one Lithium extraction; additional ex situ measurements of the pristine cathode material were taken for comparison. The observed spontaneous interaction between the cathode and the fluorinated electrolyte and the impact of subsequent cycling are discussed.