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Batteries relying on Lithium-based Water-In-Salt Electrolytes – BALWISE

Submission summary

Li-ion batteries offer the highest energy density among current rechargeable devices and have thus become essantial for a wide range of applications. Aqueous electrolytes could in principle be an alternative to the current organic ones, provided that one can increase their cost/performance ratio. For that, their operating electrochemical window must be enlarged. Within this context, recent reports pointed toward the use of superconcentrated aqueous electrolytes, poised as water-in-salt electrolytes (WiSEs), to enlarge the operating voltage from 1.23 V to 3 V. Nevertheless, as for any new finding, rationale must be provided to understand the real practability of this approach. More specifically, questions regarding the real figures of merits in terms of capacity retention, energy and coulombic efficiencies, rate capabilities at both low and high temperature, degradation mechanisms, self-discharge and degassing must be answered.
Within this context, the objective of the BALWISE project is to answer these questions through a combination of fundamental science and prototype construction and testing. More specifically, we aim at understanding the kinetic protection of the electrode by the growth of a F-based solid electrolyte interphase that passivates the negative electrode after an initial step. Furthermore, by using new derivative of the TFSI anions we aim at controlling the formation of this F-based SEI to better tune the ion transport/charge transfer at the materials interface. We will then explore a grafting strategy enlisting electrochemically assisted self-assembly of mesoporous hydrophobic thin film. Eventually, the gained knowledge about SEI formation and solvation properties of the newly studied WiSEs will be used to assemble aqueous Li-ion cells in either coin cell or pouch cells configurations and determine their performances metrics to judge on the practical viability of this approach.

Project coordination

Jean-Marie TARASCON (Chimie du solide et de l'énergie)

The author of this summary is the project coordinator, who is responsible for the content of this summary. The ANR declines any responsibility as for its contents.

Partner

ICGM Institut de chimie moléculaire et des matériaux - Institut Charles Gerhardt Montpellier
Chimie du solide et de l'énergie
PHENIX PHysicochimie des Electrolytes et Nanosystèmes InterfaciauX

Help of the ANR 437,261 euros
Beginning and duration of the scientific project: October 2019 - 42 Months

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