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X-ray absorption spectromicroscopy gives access to Li1+xAlxGe2−x(PO4)3 (LAGP) local degradation at the anode-electrolyte interface

DOI: 10.1016/j.powera.2022.100106 DOI Help

Authors: Majid Kazemian (Diamond Light Source) , Maya Kiskinova (Elettra - Sincrotrone Trieste) , Benedetto Bozzini (Politecnico di Milano)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Power Sources Advances , VOL 17-18

State: Published (Approved)
Published: November 2022
Diamond Proposal Number(s): 26226

Open Access Open Access

Abstract: Batteries with inorganic solid-state electrolytes (ISSE) are attracting notable interest for next-generation systems implementing Lithium (Li) metal anodes, in view of achieving higher energy densities combined with superior safety. Notwithstanding extensive research and development work, this technology is not yet ready for industrial implementation, one of the key challenges being the stability of ISSEs, chiefly at the anodic interface. This work attacks this issue for the specific case of the LAGP/Li (Lithium Aluminium Germanium Phosphate/Lithium) interface with a micro-spectroscopic approach centred on post mortem Scanning Transmission X-ray Microscopy (STXM) of intact LMO/LAGP/Li thin-film batteries, microfabricated in discharged state. Pristine and cycled cells were mapped to pinpoint morphochemical changes, induced by electrochemical ageing. The evidenced shape changes, corresponding to mechanical damaging of the solid/solid electrodic interfaces correlate with LAGP decomposition at the anode, leading to reduction of Ge, whereas the chemical state at the cathodic interface is preserved. Thanks to its submicron spacial resolution, the STXM at the Ge L-edge and O K-edge spectra allowed to assess the highly localized nature of the chemical transformation of LAGP and its correlation with the formation of Li outgrowth features.

Journal Keywords: LAGP; NASICON; All solid-state rechargeable batteries; STXM

Diamond Keywords: Batteries; Solid-State Batteries (SSB)

Subject Areas: Materials, Chemistry, Energy

Instruments: I08-Scanning X-ray Microscopy beamline (SXM)

Added On: 22/11/2022 09:36


Discipline Tags:

Surfaces Energy Storage Energy Technique Development - Materials Science Physics Physical Chemistry Energy Materials Chemistry Materials Science interfaces and thin films

Technical Tags:

Microscopy Spectroscopy X-ray Microscopy Scanning X-ray Microscopy X-ray Absorption Spectroscopy (XAS) Near Edge X-ray Absorption Fine Structures (NEXAFS)