Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 9, Issue 7, Pages 6390-6400Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b14719
Keywords
flexible batteries; mechanical testing; peel test; drag test; lithium-ion batteries
Funding
- Intel Corporation via Semiconductor Research Corporation [2014-IN-2571]
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Flexible lithium-ion batteries are necessary for powering the next generation of wearable electronic devices. In most designs, the mechanical flexibility of the battery is improved by reducing the thickness of the active layers, which in turn reduces the areal capacity and energy density of the battery. The performance of a battery depends on the electrode composition, and in most flexible batteries, standard electrode formulation is used, which is not suitable for flexing. Even with considerable efforts made toward the development of flexible lithium-ion batteries,, the formulation of the electrodes has received very little attention. In this study, we investigate the relation between the electrode formulation and the mechanical strength of the electrodes. Peel and drag tests are used to compare the adhesion and cohesion strength of the electrodes. The strength of an electrode is sensitive to the particle size and the choice of polymeric binder. By optimizing the electrode composition, we were able to fabricate a high areal capacity (similar to 2 mAh/cm(2)) flexible lithium-ion battery with conventional metal-based current collectors that shows superior electrochemical and mechanical performance in comparison to that of batteries with standard composition.
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