1. MXene derivative Ta4C3-Ta2O5 heterostructure as bi-functional barrier for Li-S batteries.
- Author
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Liang, Qi, Wang, Sizhe, Jia, Xiaohua, Yang, Jin, Li, Yong, Shao, Dan, Feng, Lei, Liao, Jiaxuan, and Song, Haojie
- Subjects
LITHIUM sulfur batteries ,METAL coating ,YOUNG'S modulus ,TANTALUM ,METALLIC surfaces ,BATTERY storage plants ,POLYSULFIDES - Abstract
• MXene derivative Ta 4 C 3 -Ta 2 O 5 heterostructure was firstly reported as bi-functional barrier for Li-S batteries. • A one stone two birds strategy is designed to inhibit polysulfides shuttle and protect Li metal anode. • Ta 4 C 3 -Ta 2 O 5 acquired strong coulombic interaction with Ta-S and Li-O bondings. • Ta 4 C 3 -Ta 2 O 5 heterostructure works as a robust shielding layer to achieve effective protection for Li metal anode. The shuttle effect of polysulfides during the charging and discharging of lithium-sulfur (Li-S) batteries and the growth of Li dendrites are crucial obstacles to hinder the commercialization of Li-S batteries. Heterostructure engineering is an effective strategy to accelerate catalytic conversion and suppress the dissolution of polysulfides. Herein, we report a Ta 4 C 3 -Ta 2 O 5 heterostructure composite as a bi-functional modified separator that not only achieves effective protection for lithium metal but also accelerates the polysulfides redox kinetics process. This heterostructure possesses efficient chemical anchoring and abundant active sites to immobilize polysulfides by synergistic effect, which endows a stable long cycling performance for Li-S batteries. This corresponds to an initial high capacity of 801.9 mAh g
–1 at 1 C with a decay rate of 0.086% for 500 cycles. Due to its high Young's modulus (up to 384 GPa), Ta 4 C 3 contributes to forming a protective layer on the Li metal surface to inhibit the growth of Li dendrites. Accordingly, the symmetrical cell has a stable overpotential for 700 cycles at 20 mA cm–2 /20 mAh cm–2 . So, this "one stone two birds" design affords a novel perspective for high-energy Li-S battery storage system design and Li metal protection. [Display omitted] [ABSTRACT FROM AUTHOR]- Published
- 2023
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