An adsorption-catalytic conversion catalyst Fe2O3@C-modified separator for boosting conversion of lithium polysulfides and long-life lithium-sulfur batteries
Lithium-sulfur (Li–S) batteries are a highly promising energy storage system due to their ultra-high theoretical energy density. However, Li–S batteries, based on the dissolved deposition mechanism, suffer from lithium polysulfides (LiPSs) shuttling and slow conversion kinetics, causing severe capac...
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Published in | Ionics Vol. 30; no. 10; pp. 6025 - 6035 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
Berlin/Heidelberg
Springer Berlin Heidelberg
01.10.2024
Springer Nature B.V |
Subjects | |
Online Access | Get full text |
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Summary: | Lithium-sulfur (Li–S) batteries are a highly promising energy storage system due to their ultra-high theoretical energy density. However, Li–S batteries, based on the dissolved deposition mechanism, suffer from lithium polysulfides (LiPSs) shuttling and slow conversion kinetics, causing severe capacity decay during operation. Herein, we have improved the battery life by a LiPSs adsorption-rapid catalytic conversion Fe
2
O
3
@C catalyst in the modified separator. The Fe
2
O
3
@C modified separator first physically restricts LiPSs and then rapidly converts the captured LiPSs through the polar adsorption and catalytic ability of Fe
2
O
3
, greatly promoting the LiPS conversion kinetics in Li–S batteries. The battery with Fe
2
O
3
@C exhibits excellent electrochemical performance. In detail, the initial discharge specific capacity of the first discharge is 1043.26 mAh g
−1
at 0.05 C; the specific capacity is maintained at 676.80 mAh g
−1
after 100 cycles at 0.2 C. The high specific capacity of 389.3 mAh g
−1
is maintained even after 1000 cycles with a capacity decay of 0.055% per cycle. This work provides a way to improve sulfur conversion kinetics through metal oxides. |
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ISSN: | 0947-7047 1862-0760 |
DOI: | 10.1007/s11581-024-05706-y |