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Towards Stable Lithium-Sulfur Batteries with a Low Self-Discharge Rate: Ion Diffusion Modulation and Anode Protection.
- Source :
- ChemSusChem; Sep2015, Vol. 8 Issue 17, p2892-2901, 10p
- Publication Year :
- 2015
-
Abstract
- The self-discharge of a lithium-sulfur cell decreases the shelf-life of the battery and is one of the bottlenecks that hinders its practical applications. New insights into both the internal chemical reactions in a lithium-sulfur system and effective routes to retard self-discharge for highly stable batteries are crucial for the design of lithium-sulfur cells. Herein, a lithium-sulfur cell with a carbon nanotube/sulfur cathode and lithium-metal anode in lithium bis(trifluoromethanesulfonyl)imide/1,3-dioxolane/dimethyl ether electrolyte was selected as the model system to investigate the self-discharge behavior. Both lithium anode passivation and polysulfide anion diffusion suppression strategies are applied to reduce self-discharge of the lithium-sulfur cell. When the lithium-metal anode is protected by a high density passivation layer induced by LiNO<subscript>3</subscript>, a very low shuttle constant of 0.017 h<superscript>−1</superscript> is achieved. The diffusion of the polysulfides is retarded by an ion-selective separator, and the shuttle constants decreased. The cell with LiNO<subscript>3</subscript> additive maintained a discharge capacity of 97 % (961 mAh g<superscript>−1</superscript>) of the initial capacity after 120 days at open circuit, which was around three times higher than the routine cell (32 % of initial capacity, corresponding to 320 mAh g<superscript>−1</superscript>). It is expected that lithium-sulfur batteries with ultralow self-discharge rates may be fabricated through a combination of anode passivation and polysulfide shuttle control, as well as optimization of the lithium-sulfur cell configuration. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 18645631
- Volume :
- 8
- Issue :
- 17
- Database :
- Complementary Index
- Journal :
- ChemSusChem
- Publication Type :
- Academic Journal
- Accession number :
- 109305784
- Full Text :
- https://doi.org/10.1002/cssc.201500428