Poor solid–solid
contact between an electrode and solid electrolyte is a great challenge
for all-solid-state lithium batteries (ASSLBs) which results in limited
ion transport and eventually leads to rapid capacity fading. Two-dimensional
(2D) materials have incomparable advantage in the construction of
the desired interface because of their flat surface and large specific
surface area. In order to realize intimate interfacial contact and
superior ion transport, monodisperse 2D Co3S4 hexagonal platelets as cathodes for all ASSLBs are synthesized through
a series of topological reactions followed with in situ coating of
tiny Li7P3S11 using a liquid-phase
method. The unique 2D hexagonal platelets are favorable for in situ
solid electrolyte coating. Moreover, the well-designed interfacial
structure can make the electrode materials contact with solid electrolytes
more closely, contributing to a remarkable improvement on electrochemical
performance. ASSLBs employing the Co3S4@Li7P3S11 composite platelets as a cathode
deliver a large reversible capacity of 685.9 mA h g–1 at 0.5 A g–1 for 50 cycles. Even at a high current
density of 1 A g–1, the Co3S4@Li7P3S11 composite cathode still
exhibits a high capacity of 457.3 mA h g–1 after
100 cycles. This work provides a simple strategy to design the composite
electrode with intimate contact and superior ion transport via morphology
controlling.
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