Abstract
As demands for electrochemical energy storage continue to rise, alternative electrochemistries to conventional Li-ion batteries become more appealing. Here, an intercalation-conversion hybrid cathode that combines intercalation-type VS2 with conversion-type sulfur chemistry to construct high performance solid-state lithium-sulfur batteries is reported. The layered VS2 nanomaterial features Li-ion transport channels, metallic conductivity, and active capacity contribution, all of which provide an ideal platform for the solid state S/Li2S redox couple to unlock its high gravimetric capacity. The S/VS2/Li3PS4 hybrid cathode composite is prepared by a facile, low-cost, and low-energy mechanical blending process. The S/VS2/Li3PS4|Li3PS4|Li/In (or Li) all-solid-state cell exhibits sulfur utilization of ≈85%, with a Coulombic efficiency of close to 100%. High areal capacity up to 7.8 mA h cm−2 with an active material loading (S/VS2) as high as 15.5 mg cm−2 is achieved.
Original language | English |
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Article number | 2004239 |
Journal | Advanced Functional Materials |
Volume | 31 |
Issue number | 2 |
DOIs | |
State | Published - Jan 11 2021 |
Externally published | Yes |
Funding
S.X. and C.Y.K. contributed equally to this work. This work was supported by the Natural Sciences and Engineering Council of Canada (NSERC) through their Discovery and Canada Research Chair program to L.F.N., and a doctoral scholarship (PGS-D) to C.Y.K. The authors also thank Dr. Shahrzad Hosseini Vajargah for their scientific input.
Keywords
- Li-S batteries
- all solid-state batteries
- hybrid cathodes
- thiophosphate electrolytes
- vanadium disulfide