In:
Angewandte Chemie, Wiley, Vol. 132, No. 41 ( 2020-10-05), p. 18080-18086
Abstract:
Dual‐ion batteries (DIBs) have attracted much attention owing to their low cost, high voltage, and environmental friendliness. As the source of active ions during the charging/discharging process, the electrolyte plays a critical role in the performance of DIBs, including capacity, energy density, and cycling life. However, most used electrolyte systems based on the LiPF 6 salt demonstrate unsatisfactory performance in DIBs. We have successfully developed a 7.5 mol kg −1 lithium bis(fluorosulfonyl)imide (LiFSI) in a carbonate electrolyte system. Compared with diluted electrolytes, this highly concentrated electrolyte exhibits several advantages: 1) enhanced intercalation capacity and cycling stability of the graphite cathode, 2) optimized structural stability of the Al anode, and 3) significantly increased battery energy density. A proof‐of‐concept DIB based on this concentrated electrolyte exhibits a discharge capacity of 94.0 mAh g −1 at 200 mA g −1 and 96.8 % capacity retention after 500 cycles. By counting both the electrode materials and electrolyte, the energy density of this DIB reaches up to ≈180 Wh kg −1 , which is among the best performances of DIBs reported to date.
Type of Medium:
Online Resource
ISSN:
0044-8249
,
1521-3757
DOI:
10.1002/ange.v132.41
DOI:
10.1002/ange.202006595
Language:
English
Publisher:
Wiley
Publication Date:
2020
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