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Stabilizing electrode–electrolyte interfaces to realize high-voltage Li||LiCoO2 batteries by a sulfonamide-based electrolyte

Journal Article · · Energy & Environmental Science
DOI:https://doi.org/10.1039/d1ee01265g· OSTI ID:1830205
 [1];  [1];  [1];  [2];  [1];  [1];  [1];  [2];  [3];  [1];  [1];  [4];  [5];  [5];  [2];  [2];  [6];  [1];  [1];  [1]
  1. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States)
  3. Shanghai Jiao Tong Univ. (China)
  4. Tongji Univ., Shanghai (China)
  5. Honda Research Institute, USA, Inc., San Jose, CA (United States)
  6. Honda Research Institute, USA, Inc., San Jose, California 95134, USA
+ Show Author Affiliations

High-voltage lithium-metal batteries (LMBs) with LiCoO2 (LCO) as the cathode have high volumetric and gravimetric energy densities. However, it remains a challenge for stable cycling of LCO >4.5 VLi. Here we demonstrate that a rationally designed sulfonamide-based electrolyte can greatly improve the cycling stability at high voltages up to 4.7 VLi by stabilizing the electrode–electrolyte interfaces (EEIs) on both the Li-metal anode (LMA) and high-voltage LCO cathode. With the sulfonamide-based electrolyte, commercial LCO cathodes retain 89% and 85% of their capacities after 200 and 100 cycles under high charging voltages of 4.55 VLi and 4.6 VLi, respectively, significantly outperforming traditional carbonate-based electrolytes. The surface degradation, impedance growth, and detrimental side reactions in terms of gas evolution and Co dissolution are well suppressed. Our work demonstrates a promising strategy for designing new electrolytes to realize high-energy Li||LCO batteries.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF); Honda Research Institute
Grant/Contract Number:
SC0012704
OSTI ID:
1830205
Report Number(s):
BNL--222383-2021-JAAM
Journal Information:
Energy & Environmental Science, Journal Name: Energy & Environmental Science Journal Issue: 11 Vol. 14; ISSN 1754-5692
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English

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