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Title: Tracking the evolution of processes occurring in silicon anodes in lithium ion batteries by 3D visualization of relaxation times

Journal Article · · Journal of Electroanalytical Chemistry

An unconventional electroanalytical method has been used for tracking processes in silicon anodes in lithium ion batteries: a 3D visualization of relaxation times. Impedance data of the electrodes were collected at different potentials and different cycles during cyclic voltammetry, and were treated by means of the Distribution of Relaxation Times (DRT) method. A 3D visualization of the results allowed to identify the formation of a solid electrolyte interphase on the anode, composed of two layers with different relaxation times. Such findings are not possible by conventional analysis of impedance data by modeling with equivalent circuits, nor by simple DRT alone. Additionally, it was possible to observe that the characteristic relaxation time of the lithiation of the Si anode becomes smaller upon cycling, indicating that the material experiences structural transformations that allow it to lithiate faster. The result is relevant to motivate the use of micron-sized particles in the anode.

Research Organization:
SLAC National Accelerator Lab., Menlo Park, CA (United States); Benemerita Universidad Autónoma de Puebla (BUAP) (Mexico)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-76SF00515; 582796
OSTI ID:
1814880
Alternate ID(s):
OSTI ID: 1781866
Journal Information:
Journal of Electroanalytical Chemistry, Vol. 892; ISSN 1572-6657
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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