Microsized and shape-versatile
flexible and wearable lithium-ion
batteries (LIBs) are promising and smart energy storage devices for
next-generation electronics. In the present work, we design and fabricate
the first prototype of microsized fibrous LIBs (thickness ≈
22 μm) based on multilayered coaxial structure of solid-state
battery components over flexible and electrically conductive carbon
fibers (CFs). The micro coaxial batteries over the CF surface were
fabricated via electrophoretic deposition and dip-coating methods.
The microfiber battery showed a stable potential window of 2.5 V with
an areal discharge capacity of ∼4.2 μA h cm–2 at 13 μA cm–2 of the current density. The
as-assembled battery fiber delivered a comparable energy density (∼0.006
W h cm–3) with solid-state lithium thin-film batteries
at higher power densities (∼0.0312 W cm–3). The fibrous batteries were also connected in parallel and in series
to deliver large current and high voltage, respectively. The fibrous
battery also retains up to 85% discharge capacity even after 100 charge–discharge
cycles. Furthermore, these battery fibers performed well under both
static and bending conditions, which shows the robustness of the battery
fiber. Therefore, this type of fibrous microbattery can be used in
advanced flexible and wearable microelectronics, bioelectronics, robotics,
and textile applications.
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