Electrochemical behaviors and electrochemical performances of lithium-selenium battery using selenium/carbon as cathode in different electrolytes.
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| Title: | Electrochemical behaviors and electrochemical performances of lithium-selenium battery using selenium/carbon as cathode in different electrolytes. |
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| Authors: | Lu, Bo1 (AUTHOR), Wang, Zeng-Rong1 (AUTHOR), Sun, Qiang1 (AUTHOR) sunq@smm.neu.edu.cn |
| Source: | Journal of Electroanalytical Chemistry. Sep2022, Vol. 921, pN.PAG-N.PAG. 1p. |
| Subjects: | Electrolytes, Selenium, Cathodes, Energy density, Electrochemical electrodes, Carbon |
| Abstract: | • Se/KB got severe overcharging in ether-based electrolyte due to polyselenide shuttle. • Se/KB displays a moderate electrochemical performance in ester-based electrolyte. • Se/KB cathode shows extremely high Se utilization in the solvate electrolyte. • Se/KB shows a capacity of 516 mA h g−1 at 1 C after 200 cycles in solvate electrolyte. Lithium-selenium (Li-Se) battery with high theoretical volume energy density (3253 mA h cm−3) is a very promising next-generation energy storge system, however, it still faces the problems of polyselenide generation and dissolution, as well as low active material utilization. Herein, electrochemical performance of Se/carbon cathode for Li-Se battery in three kinds of electrolytes, e.g. , ether-based, ester-based and solvate electrolyte, were studied to discuss the possibility of capacity as well as cycle life regulation. The Se/carbon cathode showed significant overcharging in the ether-based electrolyte owing to a severe polyselenide shuttle problem, and displayed a moderate electrochemical performance in ester-based electrolyte. Due to the no free solvent property of the solvate electrolyte, the Se/carbon cathode obtained extremely high Se utilization with an initial specific capacity of 621 mA h g−1 and a reversible capacity of 516 mA h g−1 at 1.0C current rate after 200cycles. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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