Patterned electrodes were developed for use in solid-state lithium-ion batteries, with the ultimate goal to promote fast-charging attributes through improving electrochemically activated surfaces within electrodes. By a conventional photolithography, patterned arrays of SnO 2 nanowires were fabricated directly on the current collector, and empty channel structures formed between the resulting arrays were customized through modifying the size and interval of the SnO 2 patterns. The composite electrolyte comprising Li 7 La 3 Zr 2 O 12 and poly(ethylene oxide) was exploited to secure intimate interfacial contact at the electrode/ electrolyte junction while preserving ionic conductivity in the bulk electrolyte. The potential and limitation of the electrode patterning approach were then explored experimentally. For example, the electrochemical behaviors of patterned electrodes were investigated as a function of variations in microchannel structures, and compared with those of conventional film-type electrodes. The findings show promise to improve electrode dynamics when electrochemical reaction kinetics could be hindered by poor interfacial characteristics on electrodes.
Nowadays, thickness optimization
of an electrode is considered
an effective approach to achieve a high energy density or high areal
capacity of Li-ion batteries. In this paper, we report a simple electrospinning
technique to develop free-standing sheet bundles of lithium titanium
oxide (LTO) nanowires with a readily controlled thickness of electrodes.
The LTO nanowire sheet bundles (LNSBs) can show a very high areal
capacity as an anode due to its microscale layer-by-layer configuration
in which the nanoscale LTO nanowires are networked in each microscale
layer. Such unique structures with interspaces formed between the
multiple stacked sheet layers should promote electrolytes to efficiently
penetrate through the thick electrode layer. Nanoscale wire assemblies
can also increase the transfer rates of ions and electrons during
the lithiation/delithiation processes. Consequently, the fabricated
LNSB electrode delivers an ultrahigh areal capacity of up to ca. 14.2
mA h cm–2 for the first cycle and ca. 6.5 mA h cm–2 for the 500th cycle at 0.2C rate current density,
which is a much larger areal capacity than the commercial graphite
anode (ca. 3.5 mA h cm–2). Such a high areal discharge
capacity on a novel free-standing electrode design could provide an
idea for advanced energy storage applications.
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