Characterisation of defects in porous silicon as an anode material using positron annihilation Doppler Broadening Spectroscopy

Characterisation of defects in porous silicon as an anode material using positron annihilation Doppler Broadening Spectroscopy

Legerstee, W.J. (TU Delft RST/Storage of Electrochemical Energy; Rotterdam University of Applied Sciences)
Noort, T. (TU Delft RST/Storage of Electrochemical Energy)
van Vliet, T. K. (Rotterdam University of Applied Sciences)
Schut, H. (TU Delft RST/Neutron and Positron Methods in Materials)
Kelder, E.M. (TU Delft RST/Storage of Electrochemical Energy)

2022

Here we present Positron Annihilation Doppler Broadening Spectroscopy (PADBS) as a powerful method to analyse the origin and development of defect processes in porous silicon structures as a result of alloying with lithium for the use in battery anode applications. Several prepared anodes were lithiated (discharged against Li⁺/Li) and de-lithiated (charged) with different capacities followed by a distinct treatment procedure and an analysis using the Delft Variable Energy Positron Beam. The results presented here show that we can distinguish two different processes attributed to (1) structural changes in silicon as a result of the alloying process, and (2) the formation of defects that initiate degradation of the material. The limit at which the porous material can be used for at least the first two cycles without the occurrence of damage can thus be accurately determined by using the PADBS technique.

Porous silicon
Positron annihilation
Silicon anode
Silicon lithium alloy

http://resolver.tudelft.nl/uuid:e08f68d5-cdd5-46fa-8acf-6bf74895d1fa

https://doi.org/10.1007/s13204-022-02550-2

2190-5509

Applied Nanoscience (Switzerland), 12 (11), 3399-3408

Institutional Repository

journal article

© 2022 W.J. Legerstee, T. Noort, T. K. van Vliet, H. Schut, E.M. Kelder