Journal
ENERGY & ENVIRONMENTAL SCIENCE
Volume 10, Issue 12, Pages 2544-2551Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7ee01898c
Keywords
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Funding
- National Key Basic Research Program 973 [2014CB239701]
- National Natural Science Foundation of China [51372116]
- Natural Science Foundation of Jiangsu Province [BK20151468]
- Funding of Jiangsu Innovation Program for Graduate Education [KYLX15_0300]
- NSF [ECCS-1610806]
- Samsung
- National Science Foundation [DMR-1419807]
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The performance of lithium-sulfur (Li-S) batteries is greatly improved by using acidized carbon nanotube paper (ACNTP) to induce in situ polymerization of ether-based DOL/DME liquid to grow an ion-selective solid barrier, to seal in soluble polysulfides on the cathode side. The Li-S battery with the in situ barrier showed an initial specific capacity of 683 mA h g(-1) at a high current density of 1675 mA g(-1), and maintained a discharge capacity of 454 mA h g(-1) after 400 cycles. The capacity decay rate was 0.1% per cycle and a high Coulombic efficiency of 99% was achieved. Experimental characterizations and theoretical models demonstrate the in situ polymerized solid barrier stops sulfur transport while still allowing bidirectional Li+ transport, alleviating the shuttle effect and increasing the cycling performance. The soft and sticky nature of the solid electrolyte barrier makes it a good sealant, forming an enclosed catholyte chamber on the sulfur side.
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