Double‐Shelled Nanocages with Cobalt Hydroxide Inner Shell and Layered Double Hydroxides Outer Shell as High‐Efficiency Polysulfide Mediator for Lithium–Sulfur Batteries |
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Authors: | Jintao Zhang Dr. Han Hu Dr. Zhen Li Prof. Xiong Wen Lou |
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Affiliation: | 1. School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore, Singapore;2. http://www.ntu.edu.sg/home/xwlou/ |
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Abstract: | Lithium–sulfur (Li‐S) batteries have been considered as a promising candidate for next‐generation electrochemical energy‐storage technologies because of their overwhelming advantages in energy density. Suppression of the polysulfide dissolution while maintaining a high sulfur utilization is the main challenge for Li–S batteries. Here, we have designed and synthesized double‐shelled nanocages with two shells of cobalt hydroxide and layered double hydroxides (CH@LDH) as a conceptually new sulfur host for Li–S batteries. Specifically, the hollow CH@LDH polyhedra with complex shell structures not only maximize the advantages of hollow nanostructures for encapsulating a high content of sulfur (75 wt %), but also provide sufficient self‐functionalized surfaces for chemically bonding with polysulfides to suppress their outward dissolution. When evaluated as cathode material for Li–S batteries, the CH@LDH/S composite shows a significantly improved electrochemical performance. |
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Keywords: | electrochemical performance double-shelled nanocages layered double hydroxides lithium– sulfur batteries nanostructures |
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