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- Title
A Multifunctional Separator Enables Safe and Durable Lithium/Magnesium–Sulfur Batteries under Elevated Temperature.
- Authors
Zhou, Zhenfang; Chen, Bingbing; Fang, Tingting; Li, Yue; Zhou, Zhongfu; Wang, Qingjie; Zhang, Jiujun; Zhao, Yufeng
- Abstract
Rechargeable metal–sulfur batteries encounter severe safety hazards and fast capacity decay, caused by the flammable and shrinkable separator and unwanted polysulfide dissolution under elevated temperatures. Herein, a multifunctional Janus separator is designed by integrating temperature endurable electrospinning polyimide nonwovens with a copper nanowire‐graphene nanosheet functional layer and a rigid lithium lanthanum zirconium oxide‐polyethylene oxide matrix. Such architecture offers multifold advantages: i) intrinsically high dimensional stability and flame‐retardant capability, ii) excellent electrolyte wettability and effective metal dendritic growth inhibition, and iii) powerful physical blockage/chemical anchoring capability for the shuttled polysulfides. As a consequence, the as constructed lithium–sulfur battery using a pure sulfur cathode displays an outstandingly high discharge capacity of 1402.1 mAh g−1 and a record high cycling stability (approximately average 0.24% capacity decay per cycle within 300 cycles) at 80 °C, outperforming the state‐of‐the‐art results in the literature. Promisingly, a high sulfur mass loading of ≈3.0 mg cm−2 and a record low electrolyte/sulfur ratio of 6.0 are achieved. This functional separator also performs well for a high temperature magnesium–sulfur battery. This work demonstrates a new concept for high performance metal–sulfur battery design and promises safe and durable operation of the next generation energy storage systems.
- Subjects
POLYSULFIDES; HIGH temperatures; MACHINE separators; LITHIUM sulfur batteries; ENERGY storage; ELECTRIC batteries; LITHIUM cells; POLYETHYLENE oxide
- Publication
Advanced Energy Materials, 2020, Vol 10, Issue 5, pN.PAG
- ISSN
1614-6832
- Publication type
Article
- DOI
10.1002/aenm.201902023