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Enhancing the performance of lithium oxygen batteries through combining redox mediating salts with a lithium protecting salt

Journal Article · · Journal of Power Sources
 [1];  [1];  [1];  [2];  [3];  [1];  [1];  [1];  [1];  [1];  [4];  [4];  [5];  [2];  [1];  [4];  [1]
  1. Univ. of Illinois, Chicago, IL (United States)
  2. Argonne National Lab. (ANL), Argonne, IL (United States); Univ. of Illinois, Chicago, IL (United States)
  3. Northern Illinois Univ., DeKalb, IL (United States)
  4. Argonne National Lab. (ANL), Argonne, IL (United States)
  5. Northern Illinois Univ., DeKalb, IL (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
+ Show Author Affiliations
Li–O2 batteries have recently emerged to meet nowadays elevated electric energy demands. Redox mediators (RMs) for solution-inducing decomposition of discharge products are one approach to increase energy efficiency and reduce high overpotentials in these batteries. However, multiple obstacles hinder their usage such as redox shuttling, capacity fading, electrolyte degradation, etc. Herein, we present a new chemistry based on a combination of LiNO3, TEGDME and an ionic liquid that enables LiI (1 M) to lower the charge potential (3.5V) with a long cycle life of 270 cycles. 0.1 M LiI increases the cyclability up to 500 with a slightly increased charge potential (~4V) for a fixed capacity of 1000 mAh/g. Up to 100 cycles, this battery system retained ~95% Li2O2 capacity with a ~0.8 V charge-discharge polarization gap. The addition of LiNO3 to the electrolyte provides a protective solid electrolyte interface (SEI) on anode that works in synergy with the LiI RM. Moreover, we found that this electrolyte blend results in domain formation of ionic and neutral species enhancing the discharge and charge processes. Finally, DFT calculations provide a better understanding of the role of the anode SEI layer and the Li2O2 decomposition promoted by the LiI during charge on the cathode.
Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE; USDOE Office of Energy Efficiency and Renewable Energy (EERE), Transportation Office. Vehicle Technologies Office
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1808271
Alternate ID(s):
OSTI ID: 1809620
Journal Information:
Journal of Power Sources, Journal Name: Journal of Power Sources Vol. 491; ISSN 0378-7753
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

25 ENERGY STORAGE
DFT calculations
Domain formation
Electrolyte
Li anode protection
Li-O2 battery
MD simulations
Redox-mediator