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Title: An Ultrahigh Capacity Graphite/Li 2S Battery with Holey-Li 2S Nanoarchitectures

The pairing of high-capacity Li 2S 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 Li 2S cathode and the lack of electrolytes compatible to both electrodes are impeding the development. Here, a novel graphite/Li 2S battery system, which features a self-assembled, holey-Li 2S nanoarchitecture and a stable solid electrolyte interface (SEI) on the graphite electrode, is reported. The holey structure on Li 2S is beneficial in decomposing Li 2S at the first charging process due to the enhanced Li ion extraction and transfer from the Li 2S 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-Li 2S battery delivers an ultrahigh discharge capacity of 810 mAh g -1 at 0.1 C (based on the mass of Li 2S) 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-Li 2S batteries for practical use.
Authors:
 [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
Publication Date:
Grant/Contract Number:
AC05-76RL01830; NRF-2016M1B3A1A01937431
Type:
Accepted Manuscript
Journal Name:
Advanced Science
Additional Journal Information:
Journal Name: Advanced Science; Journal ID: ISSN 2198-3844
Publisher:
Wiley
Research Org:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Korea Advanced Inst. of Science and Technology (KAIST), Daejeon (Korea, Republic of)
Sponsoring Org:
USDOE; National Research Foundation of Korea (NRF)
Country of Publication:
United States
Language:
English
Subject:
concentrated electrolytes; graphite/Li2S batteries; holey structures; Li2S cathodes; Li2S utilization
OSTI Identifier:
1438222