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Download fileIn Situ Synthesis of Vacancy-Rich Titanium Sulfide Confined in a Hollow Carbon Nanocage as an Efficient Sulfur Host for Lithium–Sulfur Batteries
journal contribution
posted on 2021-08-30, 15:34 authored by Yiming Zhang, Yubing Si, Wei Guo, Xiang Li, Shuai Tang, Zhaoxin Zhang, Xin Wang, Yongzhu FuThe practical application of lithium–sulfur batteries (LSBs)
is partially impeded by large volume variation, severe shuttle effect,
and inferior electrical conductivity of sulfur. On this account, a
template-free arc-discharge method for the synthesis of TiSx (1.5 < x < 2)@HCN (hollow
carbon nanocage) as an efficient sulfur host is developed for LSBs.
TiSx@HCN can accommodate the volume changes
of active materials and inhibit the shuttle effect of lithium polysulfides
(LiPSs). Theoretical calculation shows that the defective titanium
sulfide accelerates the conversion of long-chain LiPSs to intermediate
species and promotes the redox reactions. As a consequence, the resulting
hybrid cathode composited with sulfur exhibits excellent electrochemical
performances. A reversible capacity of 1118.6 mA h g–1 is obtained under 0.1 C with a slow capacity decay of 0.108% per
cycle for 200 cycles. The synthetic strategy provides a facile platform
for the synthesis of nanocomposite materials.
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theoretical calculation showssynthetic strategy providesinferior electrical conductivityhollow carbon nanocage2 )@ hcnslow capacity decaylarge volume variationsevere shuttle effectefficient sulfur hostshuttle effectvolume changesreversible capacityx sub ><situ redox reactionspractical applicationper cyclepartially impedednanocomposite materialslithium polysulfideslipss ).intermediate speciesh gfree arcfacile platformdischarge methodchain lipssactive materials> sub200 cycles