Journal
ENERGY STORAGE MATERIALS
Volume 28, Issue -, Pages 357-363Publisher
ELSEVIER
DOI: 10.1016/j.ensm.2020.03.021
Keywords
Pre-alloying; Artificial SEI; Al anode; Li hybrid capacitor
Funding
- National Natural Science Foundation of China [51822210, 51972329]
- Shenzhen Science and Technology Planning Project [JCYJ20180507182512042, JCYJ20170818153427106, YJ20170818153404696]
- Science and Technology Planning Project of Guangdong Province [2018A050506066, 2019B090914003]
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Anode materials such as aluminum (Al) are promising candidates for Li-based energy storage devices, while they suffer from huge volume change when lithiated. The large volume expansion leads to: (1) electrode pulverization, which results in the loss of active materials and the formation of dead Li; (2) iterative destruction/formation of solid electrolyte interface (SEI), which continuously consumes the electrolyte and meanwhile increases the battery impedance. Herein, we introduce a strategy of combining the pre-alloying and artificial SEI together to enhance the cycling stability of Al anode. After investigating the matching behaviors of several additives with different anodes, a pre-alloyed LiAl alloy and a LiF-rich artificial SEI are simultaneously constructed on the Al anode by pre-alloying with lithium difluoro(oxalato)borate (LiDFOB) additive, which are beneficial to compensate for the irreversible consumption of Lithorn ions and maintain the structural stability of SEI. Consequently, a novel Li hybrid capacitor (LHC) combining this pre-alloyed Al anode and environmental friendly and low-cost activated carbon (AC) cathode is established in the voltage range of 1.5-4.5 V, which exhibits a specific capacity of 123.6 mAh g(-1) with a capacity retention of 85.6% after 2000 cycles.
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