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Ultra-High Energy-Density/Nonflammable Lithium Metal Full Cells Based on Coordinated Carbonate Electrolytes

53 Pages Posted: 17 Jun 2019 Sneak Peek Status: Review Complete

See all articles by Sung-Ju Cho

Sung-Ju Cho

Ulsan National Institute of Science and Technology (UNIST) - Department of Energy Engineering

Dae-Eun Yu

Ulsan National Institute of Science and Technology (UNIST) - Department of Energy Engineering

Travis P. Pollard

U.S. Army Research Laboratory

Minchul Jang

LG Chem

Oleg Borodin

U.S. Army Research Laboratory

Sang-Young Lee

Ulsan National Institute of Science and Technology (UNIST) - Department of Energy Engineering

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Abstract

Coupling thin Li metal anodes with high-capacity/high-voltage cathodes such as LiNi0.8Co0.1Mn0.1O2 (NCM811) is a promising way to significantly 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 clusters, which is critical for enabling the formation of stable interphases 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 = 681 Wh kgcell−1/1026 Wh Lcell−1) coupled with nonflammability.

Keywords: Lithium metal full cell, Energy density, Nonflammability, Concentrated electrolyte, NCM811 cathode

Suggested Citation

Cho, Sung-Ju and Yu, Dae-Eun and Pollard, Travis P. and Jang, Minchul and Borodin, Oleg and Lee, Sang-Young, Ultra-High Energy-Density/Nonflammable Lithium Metal Full Cells Based on Coordinated Carbonate Electrolytes (June 17, 2019). JOULE-D-19-00461. Available at SSRN: https://ssrn.com/abstract=3405545 or http://dx.doi.org/10.2139/ssrn.3405545
This is a paper under consideration at Cell Press and has not been peer-reviewed.

Sung-Ju Cho

Ulsan National Institute of Science and Technology (UNIST) - Department of Energy Engineering

gil 50
Ulsan, 689-798
Korea, Republic of (South Korea)

Dae-Eun Yu

Ulsan National Institute of Science and Technology (UNIST) - Department of Energy Engineering

gil 50
Ulsan, 689-798
Korea, Republic of (South Korea)

Travis P. Pollard

U.S. Army Research Laboratory

Aberdeen Proving Ground, MD
United States

Minchul Jang

LG Chem

Korea, Republic of (South Korea)

Oleg Borodin

U.S. Army Research Laboratory

Aberdeen Proving Ground, MD
United States

Sang-Young Lee (Contact Author)

Ulsan National Institute of Science and Technology (UNIST) - Department of Energy Engineering ( email )

gil 50
Ulsan, 689-798
Korea, Republic of (South Korea)

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