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Title: Operando Synchrotron Measurement of Strain Evolution in Individual Alloying Anode Particles within Lithium Batteries

Journal Article · · ACS Energy Letters

Alloying anode materials offer high capacity for next-generation batteries, but the performance of these materials often decays rapidly with cycling because of volume changes and associated mechanical degradation or fracture. The direct measurement of crystallographic strain evolution in individual particles has not been reported, however, and this level of insight is critical for designing mechanically resilient materials. Here, we use operando X-ray diffraction to investigate strain evolution in individual germanium microparticles during electrochemical reaction with lithium. The diffraction peak was observed to shift in position and diminish in intensity during reaction because of the disappearance of the crystalline Ge phase. The compressive strain along the [111] direction was found to increase monotonically to a value of -0.21%. This finding is in agreement with a mechanical model that considers expansion and plastic deformation during reaction. As a result, this new insight into the mechanics of large-volume-change transformations in alloying anodes is important for improving the durability of high-capacity batteries.

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1417191
Journal Information:
ACS Energy Letters, Vol. 3; ISSN 2380-8195
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 24 works
Citation information provided by
Web of Science

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Cited By (5)

Binary Si–Ge Alloys as High‐Capacity Anodes for Li‐Ion Batteries journal November 2019
How Metallic Protection Layers Extend the Lifetime of NASICON-Based Solid-State Lithium Batteries journal October 2019
In Situ Experimental Measurement of the Mechanical Properties of Carbon-Based Electrodes during the Electrochemical Process journal January 2018
Interfacial Incompatibility and Internal Stresses in All‐Solid‐State Lithium Ion Batteries journal August 2019
Real-time monitoring of stress development during electrochemical cycling of electrode materials for Li-ion batteries: overview and perspectives journal January 2019

Figures / Tables (4)