Journal
ACS NANO
Volume 10, Issue 12, Pages 10981-10987Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.6b05696
Keywords
lithium sulfide; metal-organic frameworks; cathode; lithium-sulfur battery
Categories
Funding
- National Natural Science Foundation of China [51372033, 51202022, 61378028, 21403031]
- National High Technology Research and Development Program of China [2015AA034202]
- 111 Project [B13042]
- Fundamental Research Funds for the Chinese Central Universities [ZYGX2014J088, ZYGX2015Z003]
- Science & Technology Support Funds of Sichuan Province [2016GZ0151]
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Owing to the high theoretical specific capacity (1166 mAh g(-1)), lithium sulfide (Li2S) has been considered as a promising cathode material for Li-S batteries. However, the polysulfide dissolution and low electronic conductivity of Li2S limit its further application in next-generation Li-S batteries. In this report, a nanoporous Li2S@C-Co-N cathode is synthesized by liquid infiltration-evaporation of ultrafine Li2S nano particles into graphitic carbon co-doped with cobalt and nitrogen (C-Co-N) derived from metal-organic frameworks. The obtained Li2S@C-Co-N architecture remarkably immobilizes Li2S within the cathode structure through physical and chemical molecular interactions. Owing to the synergistic interactions between C-Co-N and Li2S nanoparticles, the Li2S@C-Co-N composite delivers a reversible capacity of 1155.3 (99.1% of theoretical value) at the initial cycle and 929.6 mAh g(-1) after 300 cycles, with nearly 100% Coulombic efficiency and a capacity fading of 0.06% per cycle. It exhibits excellent rate capacities of 950.6, 898.8, and 604.1 mAh g(-1) at 1C, 2C, and 4C, respectively. Such a cathode structure is promising for practical applications in highperformance Li-S batteries.
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