Irreversible morphological changes of a graphite negative-electrode at high potentials in LiPF6-based electrolyte solution

被引：18

作者：

Domi, Yasuhiro ^{[1
,3
]}

Doi, Takayuki ^{[1
,4
]}

Tsubouchi, Shigetaka ^{[1
]}

Yamanaka, Toshiro ^{[1
]}

Abe, Takeshi ^{[2
]}

Ogumi, Zempachi ^{[1
]}

机构：

[1] Kyoto Univ, Off Soc Acad Collaborat Innovat, Uji, Kyoto 6110011, Japan

[2] Kyoto Univ, Grad Sch Engn, Nishikyo Ku, Kyoto 6158510, Japan

[3] Tottori Univ, Grad Sch Engn, Dept Chem & Biotechnol, Minami 4-101,Koyama Cho, Tottori 6808552, Japan

[4] Doshisha Univ, Dept Mol Chem & Biochem, Kyoto 6100321, Japan

来源：

PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 2016年 / 18卷 / 32期

关键词：

SURFACE-FILM FORMATION; EDGE PLANE GRAPHITE; LI-ION BATTERIES; DEGRADATION MECHANISM; LITHIUM; SEI; ETHYLENE; ANODE; ELECTROCHEMISTRY; FAILURE;

D O I：

10.1039/c6cp03560d

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The degradation mechanism of a graphite negative-electrode in LiPF6-based electrolyte solution was investigated using the basal plane of highly oriented pyrolytic graphite (HOPG) as a model electrode. Changes in the surface morphology were observed by in situ atomic force microscopy. In the initial cathodic scan, a number of pits appeared at around 1.75 V vs. Li+/Li, and fine particles formed on the terrace of the HOPG basal plane at about 1.5 V vs. Li+/Li. The fine particles were characterized by spectroscopic analysis, such as X-ray photoelectron spectroscopy and attenuated total reflection Fourier transform infrared spectroscopy. We added one of the components to LiClO4-based electrolyte solution, and successfully reproduced the formation of pits and fine particles on the basal plane of HOPG. Based on these results, the formation mechanisms of pits and fine particle layers were proposed.

引用

页码：22426 / 22433

页数：8

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