A Universal Highly Concentrated Electrolyte for Improved Cycling Stability in Li(Ni1-x-yMnxCoy)O2-NMC-Based Batteries

Energies, Journal Year: 2025, Volume and Issue: 18(4), P. 974 - 974

Published: Feb. 18, 2025

While 1 M LiPF6 has been widely adopted as the standard electrolyte in current LIBs, its chemical instability reduced battery’s cycling stability by, for instance, accelerating dissolution of transition metals from electrode materials, particularly high-voltage cathodes. Lithium bis(fluorosulfonyl)imide (LiFSI) emerged a promising alternative salt next-generation energy-dense LIB electrolytes. However, despite extensive research, optimal concentration and formulation LiFSI remain unresolved, with variations typically tested across different Li(Ni1-x-yMnxCoy)O2 (NMC) series Herein, 6:4.5:8.3 LiFSI/EC/DMC (in molar ratio) is proposed universal NMC The decomposes to form uniform cathode–electrolyte interface abundant inorganic species, resulting lower resistance. By adopting electrolyte, Li-ion half-cells are all able stably cycle up 200 cycles at cut-off voltage 4.4 V. Especially high Ni content (NMC 811) cathode, capacity retention was improved 43.6% 87.5% when charged V 1C rate. This work provides feasible developing LIBs.

Language: Английский

Thermal runaway and explosibility of the gas release from 18650 sodium-ion cells of NFM chemistry

Journal of Energy Storage, Journal Year: 2025, Volume and Issue: 122, P. 116614 - 116614

Published: April 15, 2025

Language: Английский