Finegan, D P*; Tudisco, E*; Scheel, M*; Robinson, J B*; Taiwo, O O*; Eastwood, D S*; Lee, P D*; Di Michiel, M*; Bay, B*; Hall, S A*; Hinds, G; Brett, D J L*; Shearing, P R* (2016) Quantifying bulk electrode strain and material displacement within lithium batteries via high-speed operando tomography and digital volume correlation. Advanced Science, 3 (3). 1500332

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Abstract

Tracking the dynamic structure of active materials during operation of lithium batteries is essential for identifying causes of performance loss. Digital volume correlation (DVC) is applied to in-operando high-speed synchrotron X-ray computed tomography of a commercial Li/MnO2 primary battery during discharge. Real-time electrode material displacement is captured in 3D and degradation mechanisms such as delamination of the electrode from the current collector and electrode crack formation are identified. Continuum DVC of consecutive images during discharge is used to quantify local displacements and strains in 3D throughout discharge, facilitating for the first time tracking of the progression of swelling due to lithiation within the electrode material in a commercial, spiral-wound battery during normal operation. Displacement of the rigid current collector and cell materials contribute to severe electrode detachment and crack formation during discharge, which can be monitored by a 'discrete' DVC approach. Use of time-lapse X-ray computed tomography coupled with DVC is demonstrated as an effective diagnostic technique to identify causes of performance loss within commercial lithium batteries; this novel approach is expected to guide the development of more effective commercial cell designs.

Item Type:	Article
Subjects:	Advanced Materials Advanced Materials > Fuels Cells
Identification number/DOI:	10.1002/adva.201500332
Last Modified:	02 Feb 2018 13:13
URI:	http://eprintspublications.npl.co.uk/id/eprint/7054

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