In-situ scanning electron microscopy observations of Li plating and stripping reactions at the lithium phosphorus oxynitride glass electrolyte/Cu interface

被引:81
作者
Sagane, Fumihiro [1 ]
Shimokawa, Ryosuke [1 ]
Sano, Hikaru [2 ,3 ]
Sakaebe, Hikari [2 ,3 ]
Iriyama, Yasutoshi [2 ,4 ]
机构
[1] Shizuoka Univ, Dept Mat Sci & Chem Engn, Fac Engn, Naka Ku, Hamamatsu, Shizuoka 4328011, Japan
[2] CREST, JST, Chiyoda Ku, Tokyo 1020075, Japan
[3] Natl Inst Adv Ind Sci & Technol, Res Inst Ubiquitous Energy Devices, Ikeda, Osaka 5638577, Japan
[4] Nagoya Univ, Grad Sch Engn, Dept Mat Phys & Energy Engn, Chikusa Ku, Nagoya, Aichi 4648603, Japan
关键词
Lithium; Anode; All-solid-state battery; In-situ SEM; Interface; ORGANIC ELECTROLYTE; HIGH-VOLTAGE; MORPHOLOGY; SURFACE; BATTERIES; CATHODES; ANODE;
D O I
10.1016/j.jpowsour.2012.10.026
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
Morphology variations during electrochemical lithium plating stripping reactions at the lithium phosphorus oxynitride glass electrolyte (LiPON)/copper current collector (Cu) interface are observed in-situ by scanning electron microscopy (SEM). This in-situ SEM observation shows dynamically that the plating reactions at 50 mu A cm(-2) distribute initial lithium growth sites sparsely at the LiPON/Cu interface, later, local lithium growth occurs from the pre-plated sites through the Cu film, and finally, most of the precipitated lithium grows to be needle-shape with the height of micron order. This local growth rate attains to be 6.8 mA cm(-2), about 100 times higher value than applied one. When those precipitated lithium are stripped at 50 mu A cm(-2), core region of each precipitate is mostly stripped but its degree depends on the length of the precipitate. This dependency will arise from the diffusivity of Li. When this stripping current density is increased to 500 mu A cm(-2), the coulomb efficiency is further decreased. In-situ SEM observation shows that plated lithium around the interface becomes thin preferentially while that far away from the interface (upper side of plated lithium) remains unchanged. This will isolate most of precipitate lithium from LiPON film electrically, leading to further decreasing of the coulomb efficiency. (C) 2012 Elsevier B.V. All rights reserved.
引用
收藏
页码:245 / 250
页数:6
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