Herein, we present a microwave reduction strategy for the synthesis of reduced-graphene-oxide (rGO) supported TiN nanoparticle hybrid (TiN/rGO) under N2 atmosphere. The method involves GO reduction, metal oxide reduction and nitridation reaction in one single step. Due to TiN high conductivity and good interfacial affinity between it and lithium polysulfides (LiPSs), the prepared TiN/rGO-Sulfur (TiN/rGO-S) cathodes demonstrate rapid charge transfer, lower polarization, faster surface redox reaction kinetic and enhanced stability cycling performance than rGO-Sulfur (rGO-S) and TiO2/rGO-Sulfur (TiO2/rGO-S) cathodes. The initial capacity reaches 1197.6 mA h g −1 with a reversible capacity of 888.7 mA h g −1 being retained after 150 cycles at 0.1 C.
In
recent years, hierarchical porous carbonaceous material has
aroused widespread interest as the sulfur carrier-buffer for lithium–sulfur
batteries (LSBs), particularly for high-loading and high-energy LSBs.
However, the complexity and high cost of fabrication prohibit their
extensive promotion and application. In this study, a three-dimensional
porous carbon skeleton (3DPCS) has been successfully synthesized from
low-cost raw materials by a template-free method without any post-activation
process. The 3DPCS/S-60 (60 wt % sulfur content) composite exhibits
a high initial capacity of 1623 mA h g–1 (96.9%
of theoretical value) at 0.1 C. Benefiting from the abundant hierarchical
pores and highly conductive networks, the 3DPCS can be loaded with
90 wt % sulfur, which displays an initial capacity of 889.7 mA h g–1 at 1 C and a slow capacity attenuation ratio of 0.06%
per cycle during 1000 charge/discharge tests. Besides, even at an
areal sulfur loading of 3 mg cm–2, the 3DPCS/S-80
(80 wt % sulfur content) cathode exhibits an initial capacity of 1256.6
mA h g–1 at 0.1 C and retains 854.7 mA h g–1 after 200 cycles.
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