TY - JOUR
T1 - MOF-derived Co
3O
4 polyhedrons as efficient polysulfides barrier on polyimide separators for high temperature lithium–sulfur batteries
AU - Zhou, Zhenfang
AU - Li, Yue
AU - Fang, Tingting
AU - Zhao, Yufeng
AU - Wang, Qingjie
AU - Zhang, Jiujun
AU - Zhou, Zhongfu
N1 - Funding Information:
Funding: This research was funded by the National Natural Science Foundation of China (51774251), Hebei Natural Science Foundation for Distinguished Young Scholars (B2017203313), Hundred Excellent Innovative Talents Support Program in Hebei Province (SLRC2017057), Talent Engineering Training Funds of Hebei Province (A201802001), and the opening project of the state key laboratory of Advanced Chemical Power Sources (SKL-ACPS-C-11) and the APC was funded by the National Natural Science Foundation of China (51774251).
Publisher Copyright:
© 2019 by the authors. Licensee MDPI, Basel, Switzerland.
PY - 2019/11/6
Y1 - 2019/11/6
N2 - The incorporation of highly polarized inorganic compounds in functional separators is expected to alleviate the high temperature safety- and performance-related issues for promising lithium–sulfur batteries. In this work, a unique Co3O4 polyhedral coating on thermal-stable polyimide (PI) separators was developed by a simple one-step low-temperature calcination method utilizing metal-organic framework (MOF) of Co-based zeolitic-imidazolate frameworks (ZIF-Co) precursors. The unique Co3O4 polyhedral structures possess several structural merits including small primary particle size, large pore size, rich grain boundary, and high ionic conductivity, which endow the ability to adequately adsorb dissolved polysulfides. The flexible-rigid lithium-lanthanum-zirconium oxide-poly(ethylene oxide) (LLZO-PEO) coating has been designed on another side of the polyimide non-woven membranes to inhibit the growth of lithium dendrites. As a result, the as-fabricated Co3O4/polyimide/LLZO-PEO (Co3O4/PI/LLZO) composite separators displayed fair dimensional stability, good mechanical strength, flame retardant properties, and excellent ionic conductivity. More encouragingly, the separator coating of Co3O4 polyhedrons endows Li–S cells with unprecedented high temperature properties (tested at 80 °C), including rate performance 620 mAh g−1 at 4.0 C and cycling stability of 800 mAh g−1 after 200 cycles—much better than the state-of-the-art results. This work will encourage more research on the separator engineering for high temperature operation
AB - The incorporation of highly polarized inorganic compounds in functional separators is expected to alleviate the high temperature safety- and performance-related issues for promising lithium–sulfur batteries. In this work, a unique Co3O4 polyhedral coating on thermal-stable polyimide (PI) separators was developed by a simple one-step low-temperature calcination method utilizing metal-organic framework (MOF) of Co-based zeolitic-imidazolate frameworks (ZIF-Co) precursors. The unique Co3O4 polyhedral structures possess several structural merits including small primary particle size, large pore size, rich grain boundary, and high ionic conductivity, which endow the ability to adequately adsorb dissolved polysulfides. The flexible-rigid lithium-lanthanum-zirconium oxide-poly(ethylene oxide) (LLZO-PEO) coating has been designed on another side of the polyimide non-woven membranes to inhibit the growth of lithium dendrites. As a result, the as-fabricated Co3O4/polyimide/LLZO-PEO (Co3O4/PI/LLZO) composite separators displayed fair dimensional stability, good mechanical strength, flame retardant properties, and excellent ionic conductivity. More encouragingly, the separator coating of Co3O4 polyhedrons endows Li–S cells with unprecedented high temperature properties (tested at 80 °C), including rate performance 620 mAh g−1 at 4.0 C and cycling stability of 800 mAh g−1 after 200 cycles—much better than the state-of-the-art results. This work will encourage more research on the separator engineering for high temperature operation
KW - energy storage systems
KW - lithium sulfur batteries
KW - functional separators
KW - high temperature operation
KW - polyimide
KW - Polyimide
KW - Energy storage systems
KW - Functional separators
KW - High temperature operation
KW - Lithium sulfur batteries
UR - http://www.scopus.com/inward/record.url?scp=85074717699&partnerID=8YFLogxK
U2 - 10.3390/nano9111574
DO - 10.3390/nano9111574
M3 - Article
C2 - 31698837
SN - 2079-4991
VL - 9
JO - Nanomaterials
JF - Nanomaterials
IS - 11
M1 - 1574
ER -