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Electrolyte additive enabled fast charging and stable cycling lithium metal batteries

Journal Article · · Nature Energy
Batteries using lithium (Li) metal as anodes are considered promising energy storage systems because of their high energy densities. However, safety concerns associated with dendrite growth along with limited cycle life, especially at high charge current densities, hinder their practical uses. Here we report that an optimal amount (0.05 M) of LiPF6 as an additive in LiTFSI-LiBOB dual-salt/carbonate-solvent-based electrolytes significantly enhances the charging capability and cycling stability of Li metal batteries. In a Li metal battery using a 4-V Li-ion cathode at a moderately high loading of 1.75mAh cm(-2), a cyclability of 97.1% capacity retention after 500 cycles along with very limited increase in electrode overpotential is accomplished at a charge/discharge current density up to 1.75 mA cm(-2). The fast charging and stable cycling performances are ascribed to the generation of a robust and conductive solid electrolyte interphase at the Li metal surface and stabilization of the Al cathode current collector.
Research Organization:
Argonne National Laboratory (ANL)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE) - Office of Vehicle Technology
DOE Contract Number:
AC02-06CH11357
OSTI ID:
1372399
Journal Information:
Nature Energy, Journal Name: Nature Energy Journal Issue: 3 Vol. 2; ISSN 2058-7546
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English

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