Fast formation cycling for lithium ion batteries

JOURNAL OF POWER SOURCES

卷:342

Article

An, Seong Jin^1,2  Li, Jianlin¹  Du, Zhijia¹  Daniel, Claus^1,2  Wood, David L., III^1,2 

[1] Oak Ridge Natl Lab, Energy Transportat Sci Div, 1 Bethel Valley Rd,P Box 2008, Oak Ridge, TN 37831 USA

[2] Univ Tennessee, Bredesen Ctr Interdisciplinary Res & Grad Educ, 418 Greve Hall,821 Volunteer Blvd, Knoxville, TN 37996 USA

关键词: Lithium-ion battery;    Fast formation;    Cycle life;    Resistance;    Full pouch-cell;    Solid electrolyte interphase;   

DOI  :  10.1016/j.jpowsour.2017.01.011

来源: Elsevier

【 摘 要 】

The formation process for lithium ion batteries typically takes several days or more, and it is necessary for providing a stable solid electrolyte interphase on the anode (at low potentials vs. Li/Li+) for preventing irreversible consumption of electrolyte and lithium ions. An analogous layer known as the cathode electrolyte interphase layer forms at the cathode at high potentials vs. Li/Li+. However, several days, or even up to a week, of these processes result in either lower LIB production rates or a prohibitively large size of charging-discharging equipment and space (i.e. excessive capital cost). In this study, a fast and effective electrolyte interphase formation protocol is proposed and compared with an Oak Ridge National Laboratory baseline protocol. Graphite, NMC 532, and 1.2 M LiPF6 in ethylene carbonate: diethyl carbonate were used as anodes, cathodes, and electrolytes, respectively. Results from electrochemical impedance spectroscopy show the new protocol reduced surface film (electrolyte interphase) resistances, and 1300 aging cycles show an improvement in capacity retention. (C) 2017 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license

【 授权许可】

Free