Strategic Design of Highly Concentrated Electrolyte Solutions for Mg 2+ /Li + Dual-Salt Hybrid Batteries

Jae Hyun Cho, Su Jin Kim, Jinwoo Oh, Jung Hoon Ha, Kwang Bum Kim, Kwan Young Lee, Jae Kyun Lee

Research output: Contribution to journalArticlepeer-review

Abstract

The available capacity of Mg hybrid batteries is closely related to the number of charge carriers within electrolyte solutions. Therefore, in this study, a dual-salt composition capable of supplying high Li + concentration was prepared. A dual-salt electrolyte consisting of a LiAlCl 4 complex (LACC) and LiN(SO 2 CF 3 ) 2 (LiTFSI) was found to be an excellent candidate, providing 2.2 M Li + concentration along with anodic stability up to 3 V (vs Mg/Mg 2+ ). However, the LACC moiety of the above composition first had to undergo a two-step modification procedure comprising "Mg powder treatment" and "conditioning process" to properly implement Mg deposition and stripping at the Mg anode. Spontaneous substitutions of oxidation states between the anionic Al 3+ complex and metallic Mg induced by these processes resulted in the generation of Mg 2+ complex species within the LACC solutions. The modified LACC was compatible even with 2 M of LiTFSI, the concentration with which we achieved 150 mA h g -1 capacity of a FePO 4 cathode at 1.5 mg cm -2 loading density, when using an electrolyte volume of only 25.5 μL cm -2 .

Original languageEnglish
Pages (from-to)27866-27874
Number of pages9
JournalJournal of Physical Chemistry C
Volume122
Issue number49
DOIs
Publication statusPublished - 2018 Dec 13

Bibliographical note

Funding Information:
This work was supported by the institutional program of the Korea Institute of Science and Technology (project no. 2E27870 and 2E28142) and by a grant from the National Research Foundation of Korea (NRF-2011-C1AAA001-0030538).

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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