Unveiling Electrochemical Properties of Silicon for Stable Cycling Performance of Silicon Anode Materials

被引:1
|
作者
Zhang, Sheng S. [1 ]
机构
[1] DEVCOM Army Res Lab, Energy Sci Div, Battery Sci Branch, Adelphi, MD 20783 USA
关键词
silicon; anode material; cyclic voltammogram; capacity fade; state-of-lithiation; BATTERY ANODES; SI ANODES; ION; COMPOSITE;
D O I
10.1149/1945-7111/ad5efb
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
Research on silicon (Si) as an anode material for Li-ion batteries has spanned two decades; however, certain electrochemical properties of Si remain unclear. Specifically, the cyclic voltammogram (CV) pattern of Li/Si cells varies from case to case, influenced not only by the material but also by the experimental conditions. In this work, slow cyclic voltammetry is employed to investigate Li/Si cells, resulting in three distinct CV patterns. It is further observed that the CV pattern, particularly during the delithiation, is contingent on the state-of-lithiation (SOL) during lithiation and correlates with the capacity fade of Li/Si cells in subsequent cycles. Additionally, it is revealed that the primary mechanism for capacity fade differs between nano-sized silicon (Si-NP) and micro-sized silicon (Si-MP). In brief, capacity fade in Li/Si-NP cells predominantly arises from parasitic reactions between the highly lithiated Li-Si alloy and electrolyte solvents, exacerbated by the large specific surface area of Si-NP materials, whereas capacity fade in Li/Si-MP cells is primarily attributed to the Li electrode rather than the Si-MP electrode due to the restricted lithiation of Si-MP materials. Finally, this work concludes that limiting the SOL of Li/Si cells offers a straightforward and effective pathway to achieving stable cycling performance.
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页数:7
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