Journal
ELECTROCHIMICA ACTA
Volume 297, Issue -, Pages 641-649Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2018.12.009
Keywords
Li-S batteries; Separator; Carbon nanofibers; TiO2; Interlayer
Categories
Funding
- NSFC/RGC Joint Research Scheme [21661162002, N_HKUST601/16]
- Natural Science Foundation of Guangdong Province [2015A030310463]
- Science and Information Technology of Guangzhou Municipal [201704030061]
- Centre of Excellence Grant of the Hong Kong Polytechnic University [1-ZE30]
Ask authors/readers for more resources
Li-ion batteries have held a dominant position in the energy storage area for decades. However, due to the limitation of its chemistry, the energy density of Li-ion batteries is limited to similar to 300 W h kg(-1). In recent years, more attention has been paid to the Li-S batteries that are environmentally friendly, cost-effective and high energy density (theoretical value of cathode: similar to 2600 W h kg(-1)). In this study, carbonized polydopamine (C-PDA)-coated hollow carbon nanofibers (CNFs) with TiO2 nanoparticles interspersed in the void space between the CNF skeleton and carbon coating layer were subtly designed. The C-PDA/TiO2/CNF composite (CTC) was integrated with the commercial separator as a polysulfide filter to achieve high-performance Li-S batteries. It is reveals that the CTC coating layer could effectively filter and reactivate the dissolved polysulfides to achieve a stabilized sulfur-based cathode. The Li-S battery assembled by this integrated separator and the regular cathode (sulfur/Ketjen black) with 72.7 wt% of sulfur achieved a high specific capacity and low decay rate (632.5 mAh g(-1) at the first cycle and 0.06% per cycle) at 2.0C for 500 cycles. These good results indicate that the C-PDA/TiO2/CNF-modified separator could be a promising separator candidate for high performance Li-S batteries. (C) 2018 Elsevier Ltd. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available