A novel electrolyte solvent for rechargeable lithium and lithium-ion batteries

S. S. Zhang, Charles Angell

Research output: Contribution to journalArticle

57 Citations (Scopus)

Abstract

We describe a new type of electrolyte solvent which provides remarkable improvement in properties of electrolyte systems containing it. These solvents contain acidic boron atoms, in most cases linked into heterocycles by reaction of boric acid, or oxide, with glycols. Nicknamed BEG solvents (for boric acid esters of glycol), these show great propensity for dissolving salts, stabilizing alkali metals against corrosion, and in some cases, stabilizing other solvents (particularly alkene carbonates), against anodic decomposition. In the most favorable case so far, the 1,3 propylene glycol boric acid ester (BEG-1) which contains two linked borate groups, the mixed solvent formed by mixing 1 part BEG-1 with two parts ethylene carbonate provides an electrochemical stability window in excess of 5.8 V (cf. 4.5 V for ethylene carbonate alone with the same salt), an ambient temperature conductivity of 1.7 × 10-3 S cm-1 with 1 m LiClO4, and enduring stability against metallic Li, which remains shiny on prolonged (days) immersion at 100°C. We present data on various electrolyte solutions containing these components and then show their utility in devices by rubberizing them with polymers and constructing voltaic cells Li/LiMn2O4 and C/LiMn2O4, which show excellent charge/discharge characteristics and cyclability.

Original languageEnglish (US)
Pages (from-to)4047-4053
Number of pages7
JournalJournal of the Electrochemical Society
Volume143
Issue number12
StatePublished - Dec 1996

Fingerprint

Lithium
Electrolytes
electric batteries
lithium
boric acids
Boric acid
electrolytes
Glycols
glycols
Carbonates
carbonates
ions
esters
Esters
Ethylene
ethylene
Salts
salts
Alkali Metals
Propylene Glycol

ASJC Scopus subject areas

  • Electrochemistry
  • Surfaces, Coatings and Films
  • Surfaces and Interfaces

Cite this

A novel electrolyte solvent for rechargeable lithium and lithium-ion batteries. / Zhang, S. S.; Angell, Charles.

In: Journal of the Electrochemical Society, Vol. 143, No. 12, 12.1996, p. 4047-4053.

Research output: Contribution to journalArticle

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