Impact of the metal electrode size in half-cells studies: Example of graphite/Li coin cells

被引:7
|
作者
Madec, Lenaic [1 ]
Martinez, Herve
机构
[1] Univ Pau & Pays Adour, IPREM, CNRS UMR 5254, 2 Ave Pierre Angot, F-64053 Pau, France
关键词
Li metal electrode size; Graphite electrode; Electrochemical performance; Interphase formation; XPS; LI-ION BATTERIES; RAY PHOTOELECTRON-SPECTROSCOPY; HIGH-VOLTAGE; ELECTRICAL-CONDUCTIVITY; SURFACE-CHEMISTRY; ALKYL CARBONATES; LITHIUM; INTERPHASE; REACTIVITY; IDENTIFICATION;
D O I
10.1016/j.elecom.2018.04.007
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
When half-cells are used to evaluate and understand electrochemical performance and interface properties of a given electrode, the metal electrode size is rarely mentioned. To evaluate such impact on the electrochemical performance and interphase formation, graphite/Li coin cells were used. Undersizing the Li metal electrode led to significantly lower charge/discharge capacities even at C/20 rate due to incomplete lithiation/delithiation processes of the graphite electrode edge. It also led to the formation of non-uniform Li metal deposits as well as to a graphite SEI film with a thickness and composition gradient across the electrode. Oversized Li led, however to homogeneous graphite SEI film. Overall, these results highlight the critical role of the metal electrode size in half-cells and should apply to all half-cells studies using other metal electrodes such as Na, K, Mg.
引用
收藏
页码:61 / 64
页数:4
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