TY - JOUR
T1 - Titanium-based nanorods/ketjen black modified separator as polysulfides barrier for lithium sulfur cell
AU - Wan, Yonghua
AU - Ma, Xinxin
AU - Hao, Junwei
AU - Min, Huihua
AU - You, Hairui
AU - Liu, Xiaomin
AU - Yang, Hui
N1 - Publisher Copyright:
© 2020 Elsevier B.V.
PY - 2020/11/25
Y1 - 2020/11/25
N2 - The practical application of lithium sulfur (Li/S) cells is mainly hindered by the shuttle effect. Herein, the titanium-based nanorods/ketjen black (KB) composite prepared by a facile hydrothermal reaction is deposited on polypropylene to fabricate a bi-functional separator (KTO-2/PP) for Li/S cell. Using bare sublimed sulfur cathode, the cell based on KTO-2/PP separator exhibits excellent rate capability, delivering 1122, 856, and 566 mAh g−1 at 0.2, 1 and 2C, respectively. Moreover, the reversible capacity of the KTO-2/PP based cell can reach 754 mAh g−1 (1C) in the 200th cycle. Such performance boost is primarily ascribed to the KTO-2/PP separator, that Li+ is allowed to pass through but lithium polysulfides (LiPS) is shielded against shuttle. The conductive KB facilitates electron transport and adsorbs LiPS physically. The titanium-based nanorods adsorbs LiPS chemically by forming Ti–S bond which is confirmed by XPS analysis. Regarding the aged Li/S cell using KTO-2/PP, the smooth surface of PP (facing lithium anode) and the less sediment and negligible corrosion on anode indicate that the KTO-2/PP separator acts as an efficient barrier to inhibit the LiPS migration and enhances the electrochemical performance.
AB - The practical application of lithium sulfur (Li/S) cells is mainly hindered by the shuttle effect. Herein, the titanium-based nanorods/ketjen black (KB) composite prepared by a facile hydrothermal reaction is deposited on polypropylene to fabricate a bi-functional separator (KTO-2/PP) for Li/S cell. Using bare sublimed sulfur cathode, the cell based on KTO-2/PP separator exhibits excellent rate capability, delivering 1122, 856, and 566 mAh g−1 at 0.2, 1 and 2C, respectively. Moreover, the reversible capacity of the KTO-2/PP based cell can reach 754 mAh g−1 (1C) in the 200th cycle. Such performance boost is primarily ascribed to the KTO-2/PP separator, that Li+ is allowed to pass through but lithium polysulfides (LiPS) is shielded against shuttle. The conductive KB facilitates electron transport and adsorbs LiPS physically. The titanium-based nanorods adsorbs LiPS chemically by forming Ti–S bond which is confirmed by XPS analysis. Regarding the aged Li/S cell using KTO-2/PP, the smooth surface of PP (facing lithium anode) and the less sediment and negligible corrosion on anode indicate that the KTO-2/PP separator acts as an efficient barrier to inhibit the LiPS migration and enhances the electrochemical performance.
KW - Bi-functional separator
KW - Hydrothermal method
KW - Ketjen black
KW - Li/S cell
KW - Titanium-based nanorods
UR - http://www.scopus.com/inward/record.url?scp=85088020154&partnerID=8YFLogxK
U2 - 10.1016/j.jallcom.2020.155830
DO - 10.1016/j.jallcom.2020.155830
M3 - 文章
AN - SCOPUS:85088020154
SN - 0925-8388
VL - 842
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
M1 - 155830
ER -