Journal
ECS ELECTROCHEMISTRY LETTERS
Volume 3, Issue 7, Pages A76-A78Publisher
ELECTROCHEMICAL SOC INC
DOI: 10.1149/2.0081407eel
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Funding
- EPSRC [EP/I02249X/1, EP/K002252/1]
- EPSRC [EP/I00422X/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/K002252/1, EP/I02249X/1, EP/I00422X/1] Funding Source: researchfish
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Silicon-Lithium based rechargeable batteries offer high gravimetric capacity. However cycle life and electrode microstructure failure mechanisms remain poorly understood. Here we present an X-ray tomography method to investigate in-operando lithiation induced stress cracking leading to the delamination of a composite Si based electrode. Simultaneous voltage measurements show increased cell resistance correlating with severe delamination and microstructural changes. 3D analysis revealed 44.1% loss of the initial electrode-current collector area after 1 hour of operation at 2.4 mA/cm(2) and a 21.2% increase in new anode surface area. The work represents a new basis for future investigation of Si based anodes. (C) 2014 The Electrochemical Society. All rights reserved.
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