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 journalArticle

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

Fingerprint

Electrolytes
electric batteries
Salts
electrolytes
salts
supplying
conditioning
stripping
Charge carriers
Chemical analysis
Powders
charge carriers
Anodes
Cathodes
anodes
Substitution reactions
cathodes
substitutes
Oxidation
oxidation

ASJC Scopus subject areas

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

Cite this

Strategic Design of Highly Concentrated Electrolyte Solutions for Mg 2+ /Li + Dual-Salt Hybrid Batteries . / Cho, Jae Hyun; Kim, Su Jin; Oh, Jinwoo; Ha, Jung Hoon; Kim, Kwang Bum; Lee, Kwan Young; Lee, Jae Kyun.

In: Journal of Physical Chemistry C, Vol. 122, No. 49, 13.12.2018, p. 27866-27874.

Research output: Contribution to journalArticle

Cho, Jae Hyun ; Kim, Su Jin ; Oh, Jinwoo ; Ha, Jung Hoon ; Kim, Kwang Bum ; Lee, Kwan Young ; Lee, Jae Kyun. / Strategic Design of Highly Concentrated Electrolyte Solutions for Mg 2+ /Li + Dual-Salt Hybrid Batteries In: Journal of Physical Chemistry C. 2018 ; Vol. 122, No. 49. pp. 27866-27874.
@article{9472f0b31d2e4805ae3753fb8c7eb6df,
title = "Strategic Design of Highly Concentrated Electrolyte Solutions for Mg 2+ /Li + Dual-Salt Hybrid Batteries",
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 .",
author = "Cho, {Jae Hyun} and Kim, {Su Jin} and Jinwoo Oh and Ha, {Jung Hoon} and Kim, {Kwang Bum} and Lee, {Kwan Young} and Lee, {Jae Kyun}",
year = "2018",
month = "12",
day = "13",
doi = "10.1021/acs.jpcc.8b09080",
language = "English",
volume = "122",
pages = "27866--27874",
journal = "Journal of Physical Chemistry C",
issn = "1932-7447",
publisher = "American Chemical Society",
number = "49",

}

TY - JOUR

T1 - Strategic Design of Highly Concentrated Electrolyte Solutions for Mg 2+ /Li + Dual-Salt Hybrid Batteries

AU - Cho, Jae Hyun

AU - Kim, Su Jin

AU - Oh, Jinwoo

AU - Ha, Jung Hoon

AU - Kim, Kwang Bum

AU - Lee, Kwan Young

AU - Lee, Jae Kyun

PY - 2018/12/13

Y1 - 2018/12/13

N2 - 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 .

AB - 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 .

UR - http://www.scopus.com/inward/record.url?scp=85058654066&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85058654066&partnerID=8YFLogxK

U2 - 10.1021/acs.jpcc.8b09080

DO - 10.1021/acs.jpcc.8b09080

M3 - Article

AN - SCOPUS:85058654066

VL - 122

SP - 27866

EP - 27874

JO - Journal of Physical Chemistry C

JF - Journal of Physical Chemistry C

SN - 1932-7447

IS - 49

ER -