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Ionic and electronic conductivity in structural negative electrodes
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DOI：10.1016/j.electacta.2024.145501.png)
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Abstract
En 中文
The concept of structural battery presents great potential for achieving substantial weight and volume reduction in electrified transportation. A unidirectional electrode lamina consists of carbon fibres embedded in a heterogeneous structural battery electrolyte. Dielectric spectroscopy measurements reveal the presence of both ionic and electronic conductivity through-the-thickness of electrode laminas. We report that the ionic conductivity, facilitated by the ions diffusing through the structural battery electrolyte, is reminiscent of that found in freestanding structural battery electrolytes and increases with a higher content of the ion-conducting phase. On the other hand, the through thickness electronic conductivity is dictated by the size of the electronically insulating electrolyte regions and the inter-fibre contact points forming the interconnected carbon fibre network. For suppressing the out-of-plane electronic conductivity and potential battery short-circuits in thin electrode laminas (<= 700 mu m) a glass-fibre separator is required. After galvanostatic cycling, we show that the fully-delithiated electrode lamina exhibits enhanced ionic conductivity. It indicates the presence of open microcracks, formed due the extensive expansion/contraction of carbon fibres upon charging/discharging. Our study provides valuable impedance and electrochemistry data in structural battery electrodes and half-cells, paving the way for the design of innovative, lightweight structural battery cells.
Keywords:
Ionic conductivity
Electrode laminas
Dielectric spectroscopy
Galvanostatic cycling
Lithiated/delithiated states
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