Nonflammable Lithium Metal Full Cells with Ultra-high Energy Density Based on Coordinated Carbonate Electrolytes
- Ulsan National Institute of Science and Technology, Ulsan (Korea, Republic of). School of Energy and Chemical Engineering. Dept. of Energy Engineering; DOE/OSTI
- Ulsan National Institute of Science and Technology, Ulsan (Korea, Republic of). School of Energy and Chemical Engineering. Dept. of Energy Engineering
- Army Research Lab., Adelphi, MD (United States). Sensor and Electron Devices Directorate. Energy and Biomaterials Division. Battery Science Branch
- LG Chem., Daejeon (Korea, Republic of). Battery R&D Center
Coupling thin Li metal anodes with high-capacity/high-voltage cathodes such as LiNi0.8Co0.1Mn0.1O2 (NCM811) is a promising way to increase lithium battery energy density. Yet, the realization of high-performance full cells remains a formidable challenge. Here, we demonstrate a new class of highly coordinated, nonflammable carbonate electrolytes based on lithium bis(fluorosulfonyl)imide (LiFSI) in propylene carbonate/fluoroethylene carbonate mixtures. Utilizing an optimal salt concentration (4 M LiFSI) of the electrolyte results in a unique coordination structure of Li+-FSI--solvent cluster, which is critical for enabling the formation of stable interfaces on both the thin Li metal anode and high-voltage NCM811 cathode. Under highly demanding cell configuration and operating conditions (Li metal anode = 35 μm, areal capacity/charge voltage of NCM811 cathode = 4.8 mAh cm-2/4.6 V, and anode excess capacity [relative to the cathode] = 0.83), the Li metal-based full cell provides exceptional electrochemical performance (energy densities = 679 Wh kgcell-1/1,024 Wh Lcell-1) coupled with nonflammability.
- Research Organization:
- Army Research Lab., Adelphi, MD (United States). Sensor and Electron Devices Directorate. Energy and Biomaterials Division. Battery Science Branch
- Sponsoring Organization:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE)
- Grant/Contract Number:
- AC36-08GO28308
- OSTI ID:
- 1623688
- Journal Information:
- iScience, Journal Name: iScience Journal Issue: 2 Vol. 23; ISSN 2589-0042
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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