Journal
MATERIALS TODAY ENERGY
Volume 14, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.mtener.2019.100342
Keywords
Na/polysulfide batteries; Semi-liquid battery; Cross-linked sponges; 3D graphene
Funding
- Australian Research Council [DP160103244]
- UNSW Faculty of Engineering Start-up grant
- National Natural Science Foundation of China [51525206, 51521091]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDA22010602]
- UNSW Digital Grid Futures Institute, UNSW, Sydney
- UNSW-SJTU joint grant
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Sodium/sulfur (Na/S) batteries are actively studied due to their low cost and potential energy density. Improvements have been achieved in the room temperature Na/S batteries during the last decades, however still with low practical capacity and unstable cycling performance. We hereby report a semi-liquid Na/polysulfide (Na/PS) cell with unique microscale intertwined carbon/polymer sponges to alleviate sulfur loss during cycling. The as-prepared highly cross-linked structure not only facilitates mass transfer but provides functional reservoir to entrap polysulfides. The Na/PS batteries with low electrolyte/sulfur (E/S) ratio (similar to 4.05 mu L/mg) retain 375 mA h/g capacity after 200 cycles. More importantly, the interlinked sponge with high sulfur loading (e.g. 1.9 mg/cm(2)) restricts the decay rate of open-circuit voltage to only 0.04 parts per thousand per hour, which overcomes the severe self-discharge behavior observed in many Na/S cells. The highly cross-linked sponge therefore is an efficient approach to addressing the notorious challenges of Na/PS batteries. (C) 2019 Elsevier Ltd. All rights reserved.
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