DataVXACS Energy LettersPaper
journal article·2020-03-13

A 63 m Superconcentrated Aqueous Electrolyte for High-Energy Li-Ion Batteries

Long Chen, Jiaxun Zhang, Qin Li, Jenel Vatamanu, Xiao Ji, Travis P. Pollard, Chunyu Cui, Singyuk Hou, Ji Chen, Chongyin Yang, Lin Ma, Michael S. Ding, Mounesha Garaga, Steve Greenbaum, Hung-Sui Lee, Oleg Borodin, Kang Xu, Chunsheng Wang

ACS Energy Letters· Volume 5· Issue 3
Publisher page
Source abstract

Abstract

A water-in-salt electrolyte (WiSE) offers an electrochemical stability window much wider than typical aqueous electrolytes but still falls short in accommodating high-energy anode materials, mainly because of the enrichment of water molecules in the primary solvation sheath of Li+. Herein, we report a new strategy in which a non-Li cosalt was introduced to alter the Li+-solvation sheath structure. The presence of an asymmetric ammonium salt (Me3EtN·TFSI) in water increases the solubility of LiTFSI by two times, pushes the salt/water molar ratio from 0.37 in WiSE to an unprecedented value of 1.13, and significantly suppresses the water activity in both bulk electrolyte and the Li+-solvation sheath. This new 63 m (mol kgsolvent–1) aqueous electrolyte (42 m LiTFSI + 21 m Me3EtN·TFSI) offers a wide potential window of 3.25 V and supports a 2.5 V aqueous Li-ion battery (LiMn2O4//Li4Ti5O12) to deliver a high energy density of 145 Wh kg–1 stably over 150 cycles.
Source: openalex_inverted_index · Quality: baseline

Research context

Energy storage

OpenAlex topics: Advancements in Battery Materials · Advanced Battery Materials and Technologies · Advanced battery technologies research

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20742, United States

Electrochemistry Branch, Sensors and Electron Devices Directorate, U.S. Army Research Laboratory, Adelphi, Maryland 20783, United States

Department of Physics and Astronomy, Hunter College, City University of New York, New York, New York 10065, United States

Chemistry Division, Brookhaven National Laboratory, Upton, New York 11973, United States

Joint Center for Energy Storage Research, U.S. Army Research Laboratory, Adelphi, Maryland 20783, United States

Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, United States

Funding

Basic Energy Sciences · U.S. Department of Energy

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