期刊
JOURNAL OF POWER SOURCES
卷 378, 期 -, 页码 537-545出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2017.12.067
关键词
Nano-TiO2; Conductive carbon layer; Synergistic effect; Shuttle effect; Lithium-sulfur batteries
资金
- National Natural Science Foundation of China [51432003, 51672020]
Despite recent progress in designing modified separators for lithium-sulfur (Li-S) batteries, detail in optimizing the synergistic effect between chemical and physical immobilization for lithium polysulfides (LiPS) in modified separator hasn't been investigated totally. Here, a nano-TiO2 decorated carbon layer (T-DCL) has been successfully applied to modify separator for the Li-S battery. The results indicate that appropriate weight percentage of nano-TiO2 uniformly distributed in conductive carbon layer is effective to chemically and physically immobilize for LiPS, and promote the electron transfer during discharge/charge process. The performance of the modified Li-S battery with T-DCL separator are significantly enhanced, with a specific capacity of 883 mAh g(-1) retained after 180 cycles at 0.1 C and 762 mAh g(-1) retained after 200 cycles at 0.5C, which are much higher than that of separators only coated with TiO2 layer or conductive carbon layer. Besides, the separator coated with T-DCL also shows low electrochemical impedance and good lithium anode protection. These results indicate that separator with T-DCL is promising to balance the physical and chemical LIPS trapping effect, and optimize the electrochemical performance for Li-S battery.
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