Journal
JOURNAL OF POWER SOURCES
Volume 264, Issue -, Pages 155-160Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2014.04.077
Keywords
Redox shuttle; Electrode; Copper oxide; Safety; Lithium battery
Funding
- National Natural Science Foundation of China [20971117, 10979049, 21171015, 21373195, J1030412]
- Open Project of State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials [11zxfk26]
- Sofja Kovalevskaja Award from Alexander von Humboldt Foundation
- 1000 plan from Chinese Government
- Fundamental Research Funds for the Central Universities [WK2060140014, WK2060140016]
- Program for New Century Excellent Talents in University
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Overcharge safety is the most crucial problem facing especially large-sized lithium-ion batteries (LIBs) packs owing to the inevitable inhomogeneity of charge-state for each cell. We propose a fresh safety strategy to avoid overcharging, i.e. the use of a solid-state anti-overcharge additive to perform an intrinsic overcharge protection. The mechanism is triggered from a solid-state composite cathode obtained by typically mixing a pre-selected transition-metal oxide with a certain cathodes thus constituting a composite cathode. The effectiveness of this strategy is demonstrated with an example of LiCoO2/CuO (95:5 by weight) composite, which exhibits high-potential (up to 5 V vs. Li+/Li) and long-period (month-level) anti-overcharge performance. It is found that the additive does not hurt the electrochemical cycling performance under normal operational conditions. This novel safety strategy is simple and flexible, which may open a new window to develop safer LIBs systems. (C) 2014 Elsevier B.V. All rights reserved.
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