期刊
ELECTROCHIMICA ACTA
卷 56, 期 1, 页码 211-214出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2010.08.098
关键词
Ionic liquid; Lithium; Graphite anode; SEI; Bis(fluorosulfonyl) imide anion
资金
- [DS31-202/10]
The process of Li(+) reduction from room temperature ionic liquids consisting of N-methyl-N-propylpyrrolidinium cation (MPPyr(+)) and bis(fluorosulfonyl) imide (FSI(-)) or bis(trifluoromethanesulfonyl) imide (TFSI(-)) anions was studied with the use of impedance spectroscopy. Reduction was carried out on both metallic lithium (Li) and graphite (G) electrodes. It has been found that the FSI anion in high amounts is able to form a protective film on both graphite and metallic lithium. The L(+)/Li couple should rather be represented by a Li(+)/SEI/Li system. The SEI structure depends on the manner of its formation (chemical or electrochemical) and is not stable with time. The rate constant for the Li(+) + e(-) -> Li process at the Li/SEI/Li(+) (in MPPyrFSI) interface is k(o)= 4.2 x 10(-5) cm/s. In the case of carbon electrodes (G/SEI/Li(+) interface), lithium diffusion in solid graphite is the rate determining step, reducing current by ca. two orders of magnitude, from ca. 10(-4)A/cm(2), characteristic of the Li/SEI/Li(+) electrode, to ca. 10(-6)A/cm(2). (C) 2010 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据