Performance enhancement of Li-S battery with the anatase nano structured Fe doped TiO2 as a robust interlayer

被引：20

作者：

Eroglu, Omer ^{[1
]}

Kiai, Maryam Sadat ^{[2
]}

Kizil, Huseyin ^{[1
,2
]}

机构：

[1] Materials Science and Engineering, Istanbul Technical University, Istanbul,34469, Turkey

[2] Nano-Science and Nano-Engineering Program, Graduate School of Science, Engineering and Technology, Istanbul Technical University, Istanbul,34469, Turkey

来源：

Journal of Alloys and Compounds | 2021年 / 838卷

关键词：

Glass fibers - Lithium compounds - Sols - Polysulfides - Electrodes - Electrolytes - Lithium sulfur batteries - Decay (organic) - Iron - Separators - Sulfur compounds;

D O I：

10.1016/j.jallcom.2020.155607

中图分类号：

学科分类号：

摘要：

Li-S batteries are increasingly being investigated due to their high theoretical and practical energy density. During charge/discharge processes, reaction of elemental sulfur with Li+ ions leads to formation of soluble lithium polysulfides (LiPS) in the electrolyte, which diffuse toward the anode, known as the shuttle effect, which is the most serious problem about capacity degradation. One rational strategy to improve electrochemical performance of the cell relies on controlling the reactions on the coated separator surface so as to reduce LiPS shuttle between electrodes. In this work, Fe-doped (1 and 5 wt %) TiO2 synthesized via sol-jel method. This novel coating on the glass fiber separator improved polysulfides trapping and enhanced electrical conductivity. The cell with 5 wt % Fe doped separator showed low capacity decay rate of 0.08% per cycle with superior capacity retention of 751 mAh g−1 after 500 cycles at 1 C while the one with 1 wt % Fe doped showed capacity decay rate of 0.27% per cycle and capacity retention of 441 mAh g−1 after 500 cycles at 1 C. © 2020 Elsevier B.V.

引用