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Hollow TiN Microspheres Synthesized by a Template‐Free Method as a Matrix for High Performance Li‐S Battery
Author(s) -
Deng DingRong,
Wu QiHui
Publication year - 2020
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.202002641
Subject(s) - tin , materials science , chemical engineering , cathode , porosity , nitride , microsphere , titanium nitride , nanotechnology , lithium (medication) , battery (electricity) , composite material , metallurgy , chemistry , layer (electronics) , power (physics) , physics , quantum mechanics , endocrinology , engineering , medicine
Hollow titanium nitride (TiN) microspheres were synthesized using a simple and template‐free method. Compared to other approaches via templates, the way we reported is simpler and more economical. Meanwhile, the surface porous structure could form simultaneously. The TiN microspheres with an average diameter of about 1 μm are composed of tens of nanoscale spherical particles (40‐60 nm), which are first applied in cathode as a host material for lithium‐sulfur (Li−S) batteries. Due to the hollow and porous architecture and the N−Ti‐N bonding unit, the TiN spheres resist the volume changes during charge/discharge, effectively reduce the “shuttle effect”, and catalyze the sulfur conversion reaction as well. The cell with TiN microsphere cathode exhibits a large discharge capacity of 692 mAh g −1 at 1st cycle under a high rate of 5 C, releases the reversible capacity of 740 mAh g −1 under a rate of 1 C after 400 cycles with a capacity decay of 0.006 % per cycle. These results demonstrate the enormous potential of the TiN microspheres as the host material for high‐performance Li−S batteries.