Electromechanical Probing of Li/Li2CO3 Core/Shell Particles in a TEM

Date Published
01/2013
Publication Type
Journal Article
Authors
DOI
10.1149/2.018303jes
Abstract

We provide a detailed electromechanical study of individual core/shell structure – Li metal/Li2CO3 particles by utilizing an in-situ probing technique in the transmission electron microscope (TEM). This technique allows us to concurrently monitor the mechanical and electrical response of single Li/Li2CO3 core/shell structures in real time. The pressure on the Li/Li2CO3 core/shell particle was measured to be ∼15 MPa at the initiation of fracture and the conductivity of the Li2CO3 shell is estimated to be ∼10−6 S/cm. To simulate the application of the core-shell particles in a real battery, we assembled coin cells with Li metal as a counter electrode. Prior to the cell assembly, the electrode was compressed in order to break the Li2CO3 shells to expose the fresh lithium metal to the graphite. When the electrolyte is added to wet the electrode, an electrochemical reaction spontaneously occurs between the exposed Li and graphite particles to produce a partially lithiated graphite anode. This lithiation occurs prior to the initial charging process, therefore compensating for the irreversible capacity loss due to the lithium consummation events during standard formation. Our results demonstrate a new pathway for the utilization of non-lithiated cathode material in future Li-ion batteries

Journal
Journal of the Electrochemical Society
Volume
160
Year of Publication
2013
Issue
3
Pagination
A415-A419
ISBN Number
0013-4651
Organizations
Research Areas
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