Publication date: 10th April 2024
Silicon-graphite composites are among the most widely used anode materials in conventional lithium-ion batteries. Each component helps buffer the drawbacks of the other: the vast volume expansion of silicon and the low capacity of graphite. With such success, silicon-graphite composites have been considered as promising candidates in lithium-ion solid-state batteries (SSBs). Herein, we investigate the influence of silicon/ graphite ratios on the electrochemical behaviors of three composites in Li-ion SSBs. Using DC polarization and temperature-dependent electrochemical impedance spectroscopy, we observe no significant differences in either electronic or ionic conductivity of the composites. However, the performance of the composites in half-cells varies differently depending on the operating temperature. At room temperature, an increase in silicon content enhances battery performance in terms of capacity retention and rate capability, whilst at a higher temperature (e.g., 60 ℃) the trend inverses. These behaviors can be related to the competition between the electrode reactions of silicon and graphite in the composites. This study emphasizes the importance of optimizing silicon/graphite ratio in the anode composites to build Li-ion SSBs that can offer high capacity and durable cyclability.
The authors acknowledge financial support within the SilKompAs funded by Bundesministerium für Bildung und Forschung (BMBF; projects 03XP0486B and 03XP0486 C)
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