电解质
法拉第效率
碳酸乙烯酯
电池(电)
钝化
电极
容量损失
锂(药物)
化学工程
化学
锂离子电池
碳酸盐
相间
碳酸二甲酯
材料科学
纳米技术
热力学
有机化学
催化作用
物理化学
功率(物理)
内分泌学
工程类
物理
生物
医学
图层(电子)
遗传学
作者
Peter M. Attia,Stephen J. Harris,William C. Chueh
出处
期刊:Journal of The Electrochemical Society
[The Electrochemical Society]
日期:2021-05-01
卷期号:168 (5): 050543-050543
被引量:7
标识
DOI:10.1149/1945-7111/abff35
摘要
Lithium-ion battery formation affects battery cost, energy density, and lifetime. An improved understanding of the first cycle of solid-electrolyte interphase (SEI) growth on carbonaceous negative electrodes could aid in the design of optimized formation protocols. In this work, we systematically study SEI growth during the formation of carbon black negative electrodes in a standard carbonate electrolyte. We show that the initial ethylene carbonate (EC) reduction reaction occurs at ∼0.5–1.2 V during the first lithiation, except under fast lithiation rates (≥10C). The products of this EC reduction reaction do not passivate the electrode; only the SEI formed at lower potentials affects the second-cycle Coulombic efficiency. Thus, cycling quickly through the voltage regime of this reaction can decrease both formation time and first-cycle capacity loss, without an increase in subsequent-cycle capacity loss. We also show that the capacity consumed by this reaction is minimized at low temperatures and low salt concentrations. Finally, we discuss the mechanism behind our experimental results. This work reveals the fundamental processes underlying initial SEI growth on carbonaceous negative electrodes and provides insights for both optimizing the battery formation process and enabling novel electrolytes.
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