Feasible
Catalytic-Insoluble Strategy Enabled by Sulfurized
Polyacrylonitrile with In Situ Built Electrocatalysts
for Ultrastable Lithium–Sulfur Batteries
Posted on 2021-10-20 - 09:13
To
date, elemental sulfur has been considered as a prospective
cathode material for exploring high-energy power systems with low
cost and sustainability. However, its practical commercialization
has been impeded by inherent drawbacks of notorious capacity decay,
unsatisfied insulating nature, and sluggish conversion chemistry.
To address these issues, for the first time, freestanding nanofibrous
networks with hierarchical nanostructures are facilely constructed
by inlaying electrocatalytic bimetallic chalcogenides (FexMn1–xS nanoparticles)
into conductive graphene nanosheet (GN)-doped sulfurized polyacrylonitrile
(SPAN) fiber matrices. Covalent-bonded SPAN featuring an insoluble
mechanism serves as a reliable cathode substrate with enhanced electrostability
and high sulfur utilization, while high-surface-area GN dopants promote
conductivity improvement and rapid electron transfer. Meanwhile, the
results prove that sulfiphilic FexMn1–xS nanoparticles with abundant electrochemically
active sites facilitate construction of uniform deposition interfaces
and efficient electrocatalysis conversion toward lithium polysufides.
This feasible catalytic-insoluble cathode strategy drives the Li–S
battery, which exhibits excellent electrochemical performances with
a remarkable reversible discharge capacity of 967 mA h g–1 and a capacity retention of 623 mA h g–1 after
500 cycles. Moreover, the corresponding lithiation/delithiation mechanisms
are systematically investigated through complementary morphological
and spectral analyses, providing valuable insights into advanced metal–sulfur
batteries.
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Yuan, Xiaomin; Zhu, Bo; Feng, Jinkui; Wang, Chengguo; Cai, Xun; Qin, Rongman (2021). Feasible
Catalytic-Insoluble Strategy Enabled by Sulfurized
Polyacrylonitrile with In Situ Built Electrocatalysts
for Ultrastable Lithium–Sulfur Batteries. ACS Publications. Collection. https://doi.org/10.1021/acsami.1c14388