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Title: Addressing Passivation in Lithium-Sulfur Battery Under Lean Electrolyte Condition

Abstract

Reducing the electrolyte amount is critical for high practical specific energy of Li-S batteries. The lean electrolyte condition raises a complex situation for sulfur redox reactions since they rely on the electrolyte mediation. The insulating nature of discharge product Li 2S and its uncontrollable accumulation (passivation) at the cathode interface is one of the major challenges for stable cycling of a Li-S battery under lean electrolyte condition. Here, we present that the NH 4TFSI additive in electrolyte solution greatly alleviates the passivation issue in Li-S batteries under lean electrolyte condition. The ammonium additive enhances the solvation between sulfide anion and NH 4 + cation, and greatly reduces the amount of large insoluble and insulting Li 2S particles in the sulfur cathodes, which greatly facilitates the reversible and sustainable redox reactions of sulfur. Therefore, the cycle life of Li-S battery under lean electrolyte condition was greatly improved. In addition, we found that the morphology of Li anode is dependent on the cathode structures. Ammonium additive enables a homogeneous surface of cathode and Li anode and extended cycle life.

Authors:
ORCiD logo [1];  [2];  [3];  [1];  [1];  [1];  [4];  [1];  [1]
  1. Joint Center for Energy Storage Research (JCESR), Pacific Northwest National Laboratory, Richland WA 99352 USA; Energy and Environmental Directorate, Pacific Northwest National Laboratory, Richland WA 99352 USA
  2. Joint Center for Energy Storage Research (JCESR), Pacific Northwest National Laboratory, Richland WA 99352 USA; Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland WA 99352 USA
  3. Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland WA 99352 USA
  4. Joint Center for Energy Storage Research (JCESR), Pacific Northwest National Laboratory, Richland WA 99352 USA; Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland WA 99352 USA
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1490342
Report Number(s):
PNNL-SA-131237
Journal ID: ISSN 1616-301X
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
Advanced Functional Materials
Additional Journal Information:
Journal Volume: 28; Journal Issue: 38; Journal ID: ISSN 1616-301X
Publisher:
Wiley
Country of Publication:
United States
Language:
English

Citation Formats

Pan, Huilin, Han, Kee Sung, Engelhard, Mark H., Cao, Ruiguo, Chen, Junzheng, Zhang, Ji-Guang, Mueller, Karl T., Shao, Yuyan, and Liu, Jun. Addressing Passivation in Lithium-Sulfur Battery Under Lean Electrolyte Condition. United States: N. p., 2018. Web. doi:10.1002/adfm.201707234.
Pan, Huilin, Han, Kee Sung, Engelhard, Mark H., Cao, Ruiguo, Chen, Junzheng, Zhang, Ji-Guang, Mueller, Karl T., Shao, Yuyan, & Liu, Jun. Addressing Passivation in Lithium-Sulfur Battery Under Lean Electrolyte Condition. United States. doi:10.1002/adfm.201707234.
Pan, Huilin, Han, Kee Sung, Engelhard, Mark H., Cao, Ruiguo, Chen, Junzheng, Zhang, Ji-Guang, Mueller, Karl T., Shao, Yuyan, and Liu, Jun. Fri . "Addressing Passivation in Lithium-Sulfur Battery Under Lean Electrolyte Condition". United States. doi:10.1002/adfm.201707234.
@article{osti_1490342,
title = {Addressing Passivation in Lithium-Sulfur Battery Under Lean Electrolyte Condition},
author = {Pan, Huilin and Han, Kee Sung and Engelhard, Mark H. and Cao, Ruiguo and Chen, Junzheng and Zhang, Ji-Guang and Mueller, Karl T. and Shao, Yuyan and Liu, Jun},
abstractNote = {Reducing the electrolyte amount is critical for high practical specific energy of Li-S batteries. The lean electrolyte condition raises a complex situation for sulfur redox reactions since they rely on the electrolyte mediation. The insulating nature of discharge product Li2S and its uncontrollable accumulation (passivation) at the cathode interface is one of the major challenges for stable cycling of a Li-S battery under lean electrolyte condition. Here, we present that the NH4TFSI additive in electrolyte solution greatly alleviates the passivation issue in Li-S batteries under lean electrolyte condition. The ammonium additive enhances the solvation between sulfide anion and NH4+ cation, and greatly reduces the amount of large insoluble and insulting Li2S particles in the sulfur cathodes, which greatly facilitates the reversible and sustainable redox reactions of sulfur. Therefore, the cycle life of Li-S battery under lean electrolyte condition was greatly improved. In addition, we found that the morphology of Li anode is dependent on the cathode structures. Ammonium additive enables a homogeneous surface of cathode and Li anode and extended cycle life.},
doi = {10.1002/adfm.201707234},
journal = {Advanced Functional Materials},
issn = {1616-301X},
number = 38,
volume = 28,
place = {United States},
year = {2018},
month = {2}
}