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Phase Boundary Propagation in Li-Alloying Battery Electrodes Revealed by Liquid-Cell Transmission Electron Microscopy

Journal Article · · ACS Nano
Battery cycle life is directly influenced by the microstructural changes occurring in the electrodes during charge and discharge cycles. In this study, we image in situ the nanoscale phase evolution in negative electrode materials for Li-ion batteries using a fully enclosed liquid cell in a transmission electron microscope (TEM) to reveal early degradation that is not evident in the charge–discharge curves. To compare the electrochemical phase transformation behavior between three model materials, thin films of amorphous Si, crystalline Al, and crystalline Au were lithiated and delithiated at controlled rates while immersed in a commercial liquid electrolyte. This method allowed for the direct observation of lithiation mechanisms in nanoscale negative electrodes, revealing that a simplistic model of a surface-to-interior lithiation front is insufficient. For the crystalline films, a lithiation front spread laterally from a few initial nucleation points, with continued grain nucleation along the growing interface. The intermediate lithiated phases were identified using electron diffraction, and high-resolution postmortem imaging revealed the details of the final microstructure. Lastly, our results show that electrochemically induced solid–solid phase transformations can lead to highly concentrated stresses at the laterally propagating phase boundary which should be considered for future designs of nanostructured electrodes for Li-ion batteries.
Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Nanostructures for Electrical Energy Storage (NEES); Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
AC04-94AL85000; SC0001160
OSTI ID:
1265168
Report Number(s):
SAND2016--6066J; 644958
Journal Information:
ACS Nano, Journal Name: ACS Nano Journal Issue: 6 Vol. 10; ISSN 1936-0851
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (13)

Understanding materials challenges for rechargeable ion batteries with in situ transmission electron microscopy journal August 2017
Review of Recent Development of In Situ/Operando Characterization Techniques for Lithium Battery Research journal May 2019
In Situ Transmission Electron Microscopy for Energy Materials and Devices journal June 2019
Operando Observations of SEI Film Evolution by Mass‐Sensitive Scanning Transmission Electron Microscopy journal October 2019
Advanced Transmission Electron Microscopy for Electrode and Solid-Electrolyte Materials in Lithium-Ion Batteries journal June 2018
Effects of residual stress on overpotentials and mechanical integrity during electrochemical Li-alloying of Al film electrodes journal February 2017
In Situ Transmission Electron Microscopy Studies of Electrochemical Reaction Mechanisms in Rechargeable Batteries journal June 2019
In situ analytical techniques for battery interface analysis journal January 2018
Real-time monitoring of stress development during electrochemical cycling of electrode materials for Li-ion batteries: overview and perspectives journal January 2019
Using in situ and operando methods to characterize phase changes in charged lithium nickel cobalt aluminum oxide cathode materials journal January 2020
Review—Promises and Challenges of In Situ Transmission Electron Microscopy Electrochemical Techniques in the Studies of Lithium Ion Batteries journal January 2017
Cryogenic specimens for nanoscale characterization of solid–liquid interfaces journal December 2019
Current Status of Liquid-cell Transmission Electron Microscopy journal December 2019

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