期刊
APPLIED SURFACE SCIENCE
卷 513, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2020.145887
关键词
Energy-storage; Layer-by-layer coating; Sulfur cathode; Hydrogel; Capacity
类别
资金
- Science and Technology Major Project of Anhui Province [18030901093]
- Key Research and Development Program of Wuhu [2019YF07]
- Natural Science Research Project for Universities in Anhui Province [KJ2018ZD034, KJ2019A0502, KJ2017ZD40]
- Foundation of Anhui Laboratory of Molecule-Based Materials [FZJ19014]
- National Natural Science Foundation of China [61873003]
- National Key Research and Development Project of China [SQ2019YFC040023]
- Anhui Provincial Program for Innovation and Entrepreneurship of Returnees from Overseas [2019LCX005]
Li-S batteries are promising new energy-storage systems owing to their high theoretical energy density. However, the volume-change and poor conductivity of S, and shuttle effect severely restrict applications. Here, we present a novel semispherical composite consisting of sulfur and polyaniline (PANI) hydrogel coating on a bowl-shaped hollow TiO2. The TiO2@PANI@S composites show an excellent performance with a high capacity of 1058 mAh g(-1) after 200 cycles at 0.2 C, and a stable Columbic efficiency of 99.8%. The composites also possess a recoverable rate-performance under repeated tests. The Li+ ion diffusion co-efficiency is studied, which indicates that the semispherical composite enables a rapid Li+ ion transportation. In addition, the density functional theory calculations confirm a strong adsorption of TiO2 towards polysulfides including for Li2S4, Li2S6, and Li2S8, which efficiently suppress the shuttle effect.
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