3 research outputs found
Nanoporous Benzoxazole Networks by Silylated Monomers, Their Exceptional Thermal Stability, and Carbon Dioxide Capture Capacity
The pursuit of synthetic routes for
design and preparation of nanoporous
polymeric networks with inherent permanent microporosity and functionality
through bottom-up methodologies remains a driving force in developing
CO<sub>2</sub>-philic materials. We report nanoporous, processable,
benzoxazole-linked covalent organic polymers (Box-COPs) that show
exceptional thermal stability up to 576 °C. Box-COPs can be formed
into films thanks to the silylation that is used to guide polymeric
network formation. Surface areas of up to 606 m<sup>2</sup> g<sup>–1</sup> and narrow pore sizes of 4.36 Å were observed
with a CO<sub>2</sub> uptake capacity of 139.6 mg g<sup>–1</sup> at 273 K and 1 bar. Box-COPs were stable in boiling water for a
week without deteriorating CO<sub>2</sub> capture capacity
A Half Millimeter Thick Coplanar Flexible Battery with Wireless Recharging Capability
Most of the existing flexible lithium
ion batteries (LIBs) adopt the conventional cofacial cell configuration
where anode, separator, and cathode are sequentially stacked and so
have difficulty in the integration with emerging thin LIB applications,
such as smart cards and medical patches. In order to overcome this
shortcoming, herein, we report a coplanar cell structure in which
anodes and cathodes are interdigitatedly positioned on the same plane.
The coplanar electrode design brings advantages of enhanced bending
tolerance and capability of increasing the cell voltage by in series-connection
of multiple single-cells in addition to its suitability for the thickness
reduction. On the basis of these structural benefits, we develop a
coplanar flexible LIB that delivers 7.4 V with an entire cell thickness
below 0.5 mm while preserving stable electrochemical performance throughout
5000 (un)bending cycles (bending radius = 5 mm). Also, even the pouch
case serves as barriers between anodes and cathodes to prevent Li
dendrite growth and short-circuit formation while saving the thickness.
Furthermore, for convenient practical use wireless charging via inductive
electromagnetic energy transfer and solar cell integration is demonstrated
A Half Millimeter Thick Coplanar Flexible Battery with Wireless Recharging Capability
Most of the existing flexible lithium
ion batteries (LIBs) adopt the conventional cofacial cell configuration
where anode, separator, and cathode are sequentially stacked and so
have difficulty in the integration with emerging thin LIB applications,
such as smart cards and medical patches. In order to overcome this
shortcoming, herein, we report a coplanar cell structure in which
anodes and cathodes are interdigitatedly positioned on the same plane.
The coplanar electrode design brings advantages of enhanced bending
tolerance and capability of increasing the cell voltage by in series-connection
of multiple single-cells in addition to its suitability for the thickness
reduction. On the basis of these structural benefits, we develop a
coplanar flexible LIB that delivers 7.4 V with an entire cell thickness
below 0.5 mm while preserving stable electrochemical performance throughout
5000 (un)bending cycles (bending radius = 5 mm). Also, even the pouch
case serves as barriers between anodes and cathodes to prevent Li
dendrite growth and short-circuit formation while saving the thickness.
Furthermore, for convenient practical use wireless charging via inductive
electromagnetic energy transfer and solar cell integration is demonstrated