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Abstract
Due to their high theoretical capacity compared to that of state-of-the-art graphite-based electrodes, silicon electrodes have gained much research focus for use in the development of next generation lithium-ion batteries. However, a major drawback of silicon as an electrode material is that it suffers from particle fracturing due to huge volume expansion during electrochemical cycling, thus limiting commercialization of such electrodes. Understanding the role of material microstructure in electrode degradation will be instrumental in the design of stable silicon electrodes. Here, we demonstrate the application of synchrotron-based X-ray tomographic microscopy to capture and track microstructural evolution, phase transformation and fracturing within a silicon-based electrode during electrochemical lithiation.
Highlights
Lithium-ion batteries are ubiquitous as power sources in portable electronic devices due to their high energy density and long cycle life, and are being extended to applications such as electric vehicles and grid energy storage [1,2]
Vertical and horizontal cross-sections through an X-ray tomogram of the half-cell assembly are presented in Fig. 2a; the horizontal section intersects the cell at the level of the Si electrode
The dense Si particles can be differentiated from the conductive matrix and electrolyte/pore phases by their higher X-ray attenuation
Summary
Lithium-ion batteries are ubiquitous as power sources in portable electronic devices due to their high energy density and long cycle life, and are being extended to applications such as electric vehicles and grid energy storage [1,2]. To meet such demanding electronic applications, the development of highperformance lithium-ion batteries is crucial and significant research effort has been devoted to achieve this. Taiwo et al / Journal of Power Sources 342 (2017) 904e912 fracturing and pulverization, which results in loss of electrical contact and rapid capacity fading within the battery
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