期刊
ACS NANO
卷 13, 期 7, 页码 8337-8346出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.9b03784
关键词
lithium metal anodes; current collectors; carbon nanosheets; Li-S batteries; high sulfur loading
类别
资金
- National Key R&D Program of China [2017YFA0207302]
- MOST of China [201SCB932300]
- NSF of China [21731005, 21420102001, 21721001]
- Fundamental Research Funds for the Central Universities [20720160080, 20720180026]
Lithium sulfur (Li-S) batteries are attractive candidates for next-generation rechargeable batteries. With the steady development of sulfur cathodes, the recent revival of research on dendrite-free Li metal anodes offers opportunities to improve the stabilities and safety of Li-S batteries. However, the low capacities and low Li utilizations of current Li anodes hinder the improvement of the energy densities of Li-S batteries. Here, we present a facile approach to fabricate lithiophilic three-dimensional porous current collectors by modifying commercial metal foams with yolk shell structured N-doped porous carbon nanosheets. Benefiting from the structure-based rational design, this current collector is able to generate dendrite-free Li anodes with improved Coulombic efficiencies and life spans, enabling carbon/sulfur cathodes to exhibit significantly enhanced stabilities (e.g., 78.1% of capacity retention after 1400 cycles). More importantly, we successfully constructed a high-areal-capacity Li-S full cell (9.84 mAh cm(-2)) with 82% Li utilization. This work provides a promising route toward high-energy-density Li-S batteries.
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