AI Article Synopsis
- Reducing sulfur hexafluoride (SF) in lithium batteries offers a dual benefit of tackling greenhouse gas emissions while achieving a high energy density of 3922 Wh/kg.
- The slow reaction rates of this reduction process are addressed by using cobalt phthalocyanine (CoPc) molecules on a porous carbon matrix, enhancing catalytic activity.
- The results show that these LiSF cells can achieve a discharge voltage of 2.82 V and a notable areal capacity of 25 mAh/cm², significantly improving performance compared to prior methods.
Article Abstract
Reducing SF (as gas cathode) in Li batteries is a promising concept for the double benefit of mildly converting greenhouse SF and providing a high theoretical energy density of 3922 Wh kg . However, the reduction process is hampered by its sluggish kinetics. Here, cobalt phthalocyanine (CoPc) molecules immobilized on porous carbon matrix are, for the first time, introduced to the LiSF chemistry to deliver an enhanced energy density. It is revealed that the high redox potential of Co(II)Pc/[Co(I)Pc] (≈2.85 V) facilitates the formation of Co(I)N sites to catalyze the SF electrochemical reduction. By using highly porous holey nitrogen-doped carbon nanocages as carbon matrix, the LiSF cells deliver a high discharge voltage of 2.82 V at 50 mA g and an unprecedented areal capacity of 25 mAh cm at 0.1 mA cm , much superior to previous results. This work opens up new possibilities for high-efficiency conversion of SF in lithium batteries.
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| http://dx.doi.org/10.1002/smll.202103778 | DOI Listing |
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