期刊
ACS APPLIED MATERIALS & INTERFACES
卷 8, 期 8, 页码 5196-5204出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b11175
关键词
carbon nanotube current collectors; Li-ion battery; bendable battery; creasable battery; in situ mechanical testing
资金
- National Research Council
- Air Force Summer Faculty Fellowship
- National Science Foundation [CMMI-1200383]
- American Chemical Society-Petroleum Research Fund [51458-ND10]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1620901] Funding Source: National Science Foundation
- Directorate For Engineering
- Div Of Civil, Mechanical, & Manufact Inn [1619743] Funding Source: National Science Foundation
Thin-film batteries that can be folded, bent, and even repeatedly creased with minimal or no loss in electrochemical performance have been demonstrated and systematically evaluated using two dynamic mechanical testing approaches for either controlled bending or creasing of flexible devices. The results show that mechanically robust and flexible Li-ion batteries (Li4Ti5O12//LiFePO4) based on the use of a nonwoven multiwalled carbon nanotube (MWNT) mat as a current collector (CC) exhibited a 14-fold decrease in voltage fluctuation at a bending strain of 4.2%, as compared to cells using traditional metal foil CCs. More importantly, MWNT-based full-cells exhibited excellent mechanical integrity through 288 crease cycles, whereas the foil full-cell exhibited continuously degraded performance with each fold and catastrophic fracture after only 94 folds. The MWNT CCs can be attributed to excellent interfacial properties as well as high mechanical strength coupled with compliancy, which allow the batteries to easily conform during mechanical abuse. These results quantitatively demonstrate the substantial enhancement offered in both mechanical and electrochemical stability which can be realized with traditional processing approaches when an appropriate choice of a flexible and robust CC is utilized.
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