Improved lithium manganese oxide spinel/graphite Li-ion cells for high-power applications

K. Amine, J. Liu, S. Kang, I. Belharouak, Y. Hyung, D. Vissers, G. Henriksen

Research output: Contribution to journalArticle

202 Citations (Scopus)

Abstract

The degradation mechanism of lithium manganese oxide spinel/graphite Li-ion cells using LiPF6-based electrolyte was investigated by a Mn-dissolution approach during high-temperature storage, and by ac impedance measurement using a reference electrode-equipped cell. Through these studies, we confirmed that Mn ions were dissolved from the spinel cathode in the electrolyte and were subsequently reduced on the lithiated graphite electrode surface, due to the chemical activity of the lithiated graphite, and caused a huge increase in the charge-transfer impedance at the graphite/electrolyte interface, which consequently deteriorated cell performance. To overcome the significant degradation of the spinel/graphite Li-ion cells, we investigated a new electrolyte system using lithium bisoxalatoborate (LiBoB, LiB(C 2O4)2) salt not having fluorine species in its chemical structure. Superior cycling performance at elevated temperature was observed with the spinel/graphite cells using LiBoB-based electrolyte, which is attributed to the inert chemical structure of LiBoB that does not generate HF. Mn-ion leaching experiments showed that almost no Mn ions were dissolved from the spinel powder after 55°C storage for 4 weeks. Through optimization of organic solvents for the LiBoB salt, we developed an advanced Li-ion cell chemistry that used lithium manganese oxide spinel, 0.7M LiBoB/EC:PC:DMC (1:1:3), and graphite as the cathode, electrolyte, and anode, respectively. This cell provides excellent power characteristics, good calendar life, and improved thermal safety for hybrid electric vehicle applications.

Original languageEnglish
Pages (from-to)14-19
Number of pages6
JournalJournal of Power Sources
Volume129
Issue number1 SPEC. ISS.
DOIs
Publication statusPublished - 15 Apr 2004
Externally publishedYes

Fingerprint

lithium oxides
Manganese oxide
Graphite
manganese oxides
Electrolytes
spinel
Lithium
graphite
Ions
electrolytes
cells
ions
Cathodes
Salts
cathodes
Degradation
Graphite electrodes
electric hybrid vehicles
degradation
Fluorine

Keywords

  • Capacity fading
  • High-power Li-ion cell
  • LiBoB
  • Lithium manganese oxide spinel
  • Mn dissolution

ASJC Scopus subject areas

  • Electrochemistry
  • Fuel Technology
  • Materials Chemistry
  • Energy (miscellaneous)

Cite this

Improved lithium manganese oxide spinel/graphite Li-ion cells for high-power applications. / Amine, K.; Liu, J.; Kang, S.; Belharouak, I.; Hyung, Y.; Vissers, D.; Henriksen, G.

In: Journal of Power Sources, Vol. 129, No. 1 SPEC. ISS., 15.04.2004, p. 14-19.

Research output: Contribution to journalArticle

Amine, K. ; Liu, J. ; Kang, S. ; Belharouak, I. ; Hyung, Y. ; Vissers, D. ; Henriksen, G. / Improved lithium manganese oxide spinel/graphite Li-ion cells for high-power applications. In: Journal of Power Sources. 2004 ; Vol. 129, No. 1 SPEC. ISS. pp. 14-19.
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