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Title: An Ultrahigh Capacity Graphite/Li2S Battery with Holey-Li2S Nanoarchitectures

Journal Article · · Advanced Science
 [1];  [2];  [3]; ORCiD logo [1]
  1. Korea Advanced Inst. of Science and Technology (KAIST), Daejeon (Korea, Republic of). Dept. of Chemical and Biomolecular Engineering. KAIST Inst. for the NanoCentury. Advanced Battery Center
  2. Korea Advanced Inst. of Science and Technology (KAIST), Daejeon (Korea, Republic of). Dept. of Chemical and Biomolecular Engineering
  3. Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Electrochemical Materials & Systems Energy and Environment Directorate

The pairing of high-capacity Li2S cathode (1166 mAh g-1) and lithium-free anode (LFA) provides an unparalleled potential in developing safe and energy-dense next-generation secondary batteries. However, the low utilization of the Li2S cathode and the lack of electrolytes compatible to both electrodes are impeding the development. Here, a novel graphite/Li2S battery system, which features a self-assembled, holey-Li2S nanoarchitecture and a stable solid electrolyte interface (SEI) on the graphite electrode, is reported. The holey structure on Li2S is beneficial in decomposing Li2S at the first charging process due to the enhanced Li ion extraction and transfer from the Li2S to the electrolyte. In addition, the concentrated dioxolane (DOL)-rich electrolyte designed lowers the irreversible capacity loss for SEI formation. By using the combined strategies, the graphite/holey-Li2S battery delivers an ultrahigh discharge capacity of 810 mAh g-1 at 0.1 C (based on the mass of Li2S) and of 714 mAh g-1 at 0.2 C. Moreover, it exhibits a reversible capacity of 300 mAh g-1 after a record lifecycle of 600 cycles at 1 C. These results suggest the great potential of the designed LFA/holey-Li2S batteries for practical use.

Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States); Korea Advanced Inst. of Science and Technology (KAIST), Daejeon (Korea, Republic of)
Sponsoring Organization:
USDOE; National Research Foundation of Korea (NRF)
Grant/Contract Number:
AC05-76RL01830; NRF-2016M1B3A1A01937431
OSTI ID:
1438222
Journal Information:
Advanced Science, Vol. 5, Issue 7; ISSN 2198-3844
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 29 works
Citation information provided by
Web of Science

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Cited By (2)

Redox Mediator: A New Strategy in Designing Cathode for Prompting Redox Process of Li–S Batteries journal August 2019
A Li 2 S‐TiS 2 ‐Electrolyte Composite for Stable Li 2 S‐Based Lithium–Sulfur Batteries journal June 2019

Figures / Tables (5)