期刊
ACS APPLIED MATERIALS & INTERFACES
卷 11, 期 6, 页码 5687-5694出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b22014
关键词
Li-S batteries; vanadium nitride; separator modification; polysulfide regulation; sulfur redox kinetics
资金
- National Natural Science Foundation of China [51702225]
- National Key Research and Development Program [2016YFA0200103]
- Jiangsu Youth Science Foundation [BK20170336]
- Postgraduate Research & Practice Innovation Program of Jiangsu Province [KYCX17-2023]
Lithium-sulfur (Li-S) batteries have now emerged as the next-generation rechargeable energy storage system because of the high energy density and theoretical capacity. However, the notorious lithium polysulfide (LiPS) shuttle and sluggish kinetics in sulfur redox have posted great threat to their practical applications. Herein, we develop a VN-modified separator as an effective promoter to regulate the LiPSs and accelerate the electrochemical kinetics of Li-S batteries. Benefiting from the dense packing structure and polar surface of porous VN, the VN-modified separator favorably synergizes bifunctionality of physical confinement and chemical entrapment toward LiPSs while affording smooth lithium-ion migration. In addition, the superb electrical conductivity of VN also propels the LiPS conversion. With these advantages, thus-integrated batteries with VN-modified separator exhibit an average capacity decay of 0.077% per cycle at 1 C cycles. A reasonable areal capacity of 4.2 mAh cm(-2) is achieved even with a high sulfur mass loading of 3.8 mg cm(-2) at 0.2 C. The present work offers a rational strategy to regulate the LiPS behavior and guide the sulfur redox kinetics toward effective and long-life Li-S batteries.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据