[ACS Nano] 我室郑南峰教授发表论文:Robust Lithium Metal Anodes Realized by Lithiophilic 3D Porous Current Collectors for Constructing High-Energy Lithium-Sulfur Batteries

发布日期:2019年07月12日   浏览次数:

我室郑南峰教授在 ACS Nano 上发表论文:Robust Lithium Metal Anodes Realized by Lithiophilic 3D Porous Current Collectors for Constructing High-Energy Lithium-Sulfur Batteries

文章链接:https://pubs.acs.org/doi/10.1021/acsnano.9b03784?rand=msnahruo

摘要:

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 safeties 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 lifespans, 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% of Li utilization. This work provides a promising route towards high-energy-density Li-S batteries.