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Totally compatible P4S10+n cathodes with self-generated Li+ pathways for sulfide-based all-solid-state batteries
- Source :
- Energy Storage Materials. 28:325-333
- Publication Year :
- 2020
- Publisher :
- Elsevier BV, 2020.
-
Abstract
- All-solid-state lithium sulfur batteries (ASSLSBs) are considered promising candidates for next-generation energy-storage systems due to their enhanced safety and high theoretical energy density. However, usually both solid-state electrolyte (SSE) and conductive carbon need to be incorporated into the cathode composite to provide Li+/electron pathways, leading to the reduced energy density and inevitable SSE decomposition. Moreover, the real electrochemical behavior of S or Li2S cathodes can not be reflected due to the partially overlapped redox reaction of SSE. Herein, a series of unique P4S10+n cathodes for high-performance ASSLSBs that totally do not need any extra SSE additives are reported. Synchrotron-based X-ray absorption near edge structure coupled with other analyses confirmed that ionic conductive Li3PS4 together with Li4P2S6 components can be electrochemically self-generated during lithiation process and partially maintained to provide fast Li+ transport pathways within the cathode layer. This is further evidenced by a 30–43-fold higher reversible capacity for P4S10+n/C cathodes compared to a S/C cathode. Bulk-type ASSLSBs based on the P4S34/C cathode show a highly reversible capacity of 883 mAh g−1 and stable cycling performance over 180 cycles with a high active material content of 70 wt%. The present study provides a promising approach for generating ionic conductive components from the electrode itself to facilitate Li+ migration within electrodes in ASSLSBs.
- Subjects :
- chemistry.chemical_classification
Materials science
Sulfide
Renewable Energy, Sustainability and the Environment
Energy Engineering and Power Technology
Ionic bonding
02 engineering and technology
Electrolyte
010402 general chemistry
021001 nanoscience & nanotechnology
Electrochemistry
01 natural sciences
7. Clean energy
Redox
Cathode
0104 chemical sciences
law.invention
Chemical engineering
chemistry
law
Electrode
General Materials Science
0210 nano-technology
Absorption (electromagnetic radiation)
Subjects
Details
- ISSN :
- 24058297
- Volume :
- 28
- Database :
- OpenAIRE
- Journal :
- Energy Storage Materials
- Accession number :
- edsair.doi...........55145fb98da987107efeebc3bcacbf4e