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A special TEM Li-ion battery sample preparation and application technique for investigating the nano structural properties of the SEI in lithium ion batteries

Published online by Cambridge University Press:  29 May 2020

Xiangyun Song ,
Yanbao Fu ,
Chengyu Song ,
Philip Ross  and
Vince Battaglia Open the ORCID record for Vince Battaglia [Opens in a new window]
Xiangyun Song
Affiliation:
Energy Storage and Distributed Resources (ESDR) Department, Lawrence Berkeley National Laboratory, University of California
Yanbao Fu
Affiliation:
Energy Storage and Distributed Resources (ESDR) Department, Lawrence Berkeley National Laboratory, University of California
Chengyu Song
Affiliation:
National Center for Electron Microscopy of Molecular Foundry, Lawrence Berkeley National Laboratory, University of California
Philip Ross
Affiliation:
Energy Storage and Distributed Resources (ESDR) Department, Lawrence Berkeley National Laboratory, University of California
Vince Battaglia
Affiliation:
Energy Storage and Distributed Resources (ESDR) Department, Lawrence Berkeley National Laboratory, University of California
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Abstract

Herein we describe a technique for preparing samples from cycled Li-ion batteries with minimal contact with atmospheric water for examination by TEM and to provide the results of an analysis of the SEI in Li-ion cells. The electrode samples were prepared in a glove box by manipulation with a diamond tipped pen to carefully dislodge particles directly onto the TEM sample holder. Electrodes were extracted from Li-ion cells that contained a cathode of high capacity, manganese rich NCM (HCMR-NCM). Nanometer-sized MnF2 crystal particles embed themselves in the SEI layer of the anodes as observed and confirmed by HRTEM lattice image analysis and EELS. Cross-sections of the SEI layer reveal that the thickness of the SEI and propensity for MnF2 crystal deposition is non-uniform.

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Articles
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MRS Advances , Volume 5 , Issue 27-28: Energy & Environment , 2020 , pp. 1415 - 1421
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Copyright
Copyright © Materials Research Society 2020

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