摘要
The polysulfide shuttle limits the development of lithium-sulfur(Li-S) batteries with high energy density and long lifespan. Herein, nitrogen doped hollow carbon nanospheres(NHCS) derived from polymerization of dopamine on SiO_(2)nanospheres are employed to modify the commercial polypropylene/polyethylene/polypropylene tri-layer separators(PP/PE/PP@NHCS). The abundant nitrogen heteroatoms in NHCS exhibit strong chemical adsorption toward polysulfides, which can effectively suppress the lithium polysulfides shuttle and further enhance the utilization of active sulfur. Lithium-sulfur batteries employing the PP/PE/PP@NHCS deliver an initial discharge capacity of 1355 mAh/g and retain high capacity of 921 mAh/g after 100 cycles at 0.2 C. At a high rate of 2 C, the lithium-sulfur batteries exhibit capacity of 461 mAh/g after 1000 cycles with a capacity fading rate of 0.049% per cycle. This work demonstrates that the NHCS coated PP/PE/PP separator is promising for future commercial applications of lithium-sulfur batteries with improved electrochemical performances.
基金
supported by the National Natural Science Foundation of China (Nos. U1964205, 51872303, 52172253)
Zhejiang Provincial Natural Science Foundation of China (No. LD18E020004)
Ningbo S&T Innovation 2025 Major Special Programme (Nos. 2019B10044, 20211ZDYF020077)
Zhejiang Provincial Key R&D Program of China (No. 2022C01072)
Chongqing Research Program of Basic Research and Frontier Technology (No. cstc2019jcyjmsxm X0510)
Youth Innovation Promotion Association CAS (No. 2017342)。