Mitigating irreversible capacity losses from carbon agents via surface modification

JOURNAL OF POWER SOURCES

卷:275

Article

Piper, Daniela Molina^1,2  Son, Seoung-Bum²  Travis, Jonathan J.³  Lee, Younghee³  Han, Sang Sub⁴  Kim, Seul Cham⁴  Oh, Kyu Hwan⁴  George, Steven M.^1,3  Lee, Se-Hee¹  Ban, Chunmei² 

[1] Univ Colorado, Dept Mech Engn, Boulder, CO 80309 USA

[2] Natl Renewable Energy Lab, Golden, CO 80401 USA

[3] Univ Colorado, Dept Chem & Biochem, Boulder, CO 80309 USA

[4] Seoul Natl Univ, Dept Mat Sci & Engn, Seoul 151742, South Korea

关键词: Lithium-ion battery;    Atomic layer deposition;    Molecular layer deposition;    Irreversible capacity loss;   

DOI  :  10.1016/j.jpowsour.2014.11.032

来源: Elsevier

【 摘 要 】

Greatly improved cycling performance has been demonstrated with conformally coated lithium-ion electrodes by atomic layer deposition (ALD) and molecular layer deposition (MLD) techniques. This paper reports the impact of coating on the electrode additives towards mitigating undesired parasitic reactions during cycling. The ALD and MLD coatings with conformality and atomic scale thickness control effectively stabilize the surface of the electrode components, and the current collector, resulting in the increase of coulombic efficiency throughout cycling. The organic fragment integrated into the recently developed MLD process allows the coating to possess excellent mechanical properties and enhanced ionic conductivity, which significantly reduces cell polarizations throughout cycling. This work validates the importance of ALD and MLD as surface modifiers and further demonstrates their versatility and compatibility with lithium-ion battery technology. (C) 2014 Elsevier B.V. All rights reserved.

【 授权许可】

Free