Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 8, Issue 5, Pages 2741-2751Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9ta12135h
Keywords
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Funding
- National Key R&D Program of China [2016YFA0202602]
- Academy of Scientific Research & Technology (ASRT, Egypt)
- Science & Technology Development Fund (STDF, Egypt)
- National Natural Science Foundation of China [U1663225, 21671155, 21805220]
- Hubei Provincial Natural Science Foundation [2018CFB242, 2018CFA054]
- Major Programs of Technical Innovation in Hubei [2018AAA012]
- Research Fund of the State Key Laboratory of Silicate Materials for Architectures [20131d0005]
- Talent Research Fund of WHUT [40122060]
- Program for Battery Materials of SINOPEC [217027-5]
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Lithium-sulfur batteries with high theoretical specific capacity are quite promising in energy storage systems. The application of lithium-sulfur batteries however has mainly been hampered by the severe shuttle effect of polysulfides during the charging/discharging process. Here, we report the in situ self-assembling of ultra-thin flexible polyaniline layer decorated manganese dioxide nanoparticles (PANI-MnO2) to form a three-dimensional hierarchically porous network as a sulfur host for lithium-sulfur batteries. The hierarchically porous PANI-MnO2 network not only provides a porous structure to alleviate the volume expansion, but also offers fast channels to accelerate the transfer of active species, electrons and ions to improve the redox reaction kinetics. The as-fabricated PANI-MnO2-S electrode thus demonstrates excellent electrochemical performance, with a stable capacity up to 1195 mA h g(-1) at 0.5C after 100 cycles. In particular, the hierarchically porous PANI-MnO2 network employs an extraordinary chemical process for polysulfides to form active thiosulfates, which are further converted into Li2S. This significantly suppresses the shuttle effect, thus providing the possibility for fast charging. As a result, the PANI-MnO2-S electrode exhibits a discharge capacity of 640 mA h g(-1) at 2C after 500 cycles. Even at a high sulfur loading of 4.0 mg cm(-2), a stable areal capacity of similar to 3.12 mA h cm(-2) is achieved at 1C after 200 cycles.
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