期刊
ENERGY STORAGE MATERIALS
卷 52, 期 -, 页码 120-129出版社
ELSEVIER
DOI: 10.1016/j.ensm.2022.07.041
关键词
Lithium-sulfur batteries; Shuttle effect; Interlayers; Graphene oxide; Two-dimensional clay
资金
- National Natural Science Foundation of China [51972070, 52062004]
- Guizhou Provincial High Level Innovative Talents Project [QKHPTRCGCC[2022]013-1]
- Guizhou Provincial Science and Technology Projects [QKHJC [2020]1Z042, QKHZC[2021]YB317]
- Cultivation Project of Guizhou University [GDPY[2019]01]
- Graduate Innovation Research Fund of Guizhou Province [YJSCXJH [2020]028]
- Australian Government
- University of Adelaide
This study designed a 2D heterostructure integrating Li-MMT and nitrogen-doped RGO to improve the redox reaction kinetics in lithium-sulfur batteries, achieving high-efficiency electrochemical reactions and improved battery performance.
In lithium-sulfur batteries, the polysulfide redox reaction kinetics is obstructed by unfavorable electron conduction and ion transportation. To address this issue, a two-dimensional (2D) heterostructure with fast ion/electron transport bi-pathways is designed herein by well integrating monolayer lithium-montmorillonite (MMT) and nitrogen-doped reduced graphene oxide (RGO). The low diffusion barrier on the Li-MMT contributes to the fast lithium ion transport, and the nearby RGO builds high electron conduction network, which enables high-efficiency adsorption-diffusion-conversion for polysulfides and achieves fast electrochemical reaction kinetics. Consequently, the lithium-sulfur batteries using the heterostructure interlayer show effective suppression towards the notorious shuttle effect of polysulfides, as well as deliver high initial specific capacity of 1317 mAh g(-1) at 0.2 C, high rate capability of 848 mAh g(-1) even at 3 C, and low capacity decay rate of 0.011% per cycle at 1 C over 200 cycles and 0.067% per cycle at 2 C over 600 cycles. The corresponding pouch cell shows high initial discharge capacity of 1542 mAh g(-1) at 0.05 C. This work exhibits the potential application of the low-cost and environmentally-friendly clay as the 2D heterostructure interlayer material for realizing high-energy-density, long-lasting, and high-rate Li-S batteries.
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