Modification of LiCl-LiBr-KBr electrolyte for LiAl/FeS{sub 2} batteries

Conference · Sat Jun 01 00:00:00 EDT 1996

OSTI ID:244578

Kaun, T D; Jansen, A N; Henriksen, G L; Vissers, D R ^[1]

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1. Argonne National Lab., IL (United States). Chemical Technology Div.

The bipolar LiAl/FeS{sub 2} battery is being developed to achieve the high performance and long cycle life needed for electric vehicle application. The molten-salt (400 to 440 C operation) electrolyte composition for this battery has evolved to support these objectives. An earlier change to LiCl-LiBr-KBr electrolyte is responsible for significantly increased cycle life (up to 1,000 cycles). Recent electrolyte modification has significantly improved cell performance; approximately 50% increased power, with increased high rate capacity utilization. Results are based on power-demanding EV driving profile test at 600 W/kg. The effects of adding small amounts (1--5 mol%) of LiF and LiI to LiCl-LiBr-KBr electrolyte are discussed. By cyclic voltammetry, the modified electrolytes exhibit improved FeS{sub 2} electrochemistry. Electrolyte conductivity is little changed, but high current density (200 mA/cm{sup 2}) performance improved by approximately 50%. A specific feature of the LiI addition is an enhanced cell overcharge tolerance rate from 2.5 to 5 mA/cm{sup 2}. The rate of overcharge tolerance is related to electrolyte properties and negative electrode lithium activity. As a result, the charge balancing of a bipolar battery configuration with molten-salt electrolyte is improved to accept greater cell-to-cell deviations.

• Research Organization: Argonne National Lab. (ANL), Argonne, IL (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 244578
• Report Number(s): ANL/CMT/CP-88857; CONF-960502-15; ON: DE96011116; TRN: AHC29613%%53
• Resource Relation: Conference: 189. meeting of the Electrochemical Society (ECS), Los Angeles, CA (United States), 5-10 May 1996; Other Information: PBD: [1996]
• Country of Publication: United States
• Language: English

Related Subjects

25 ENERGY STORAGE
ELECTRIC BATTERIES
ELECTROLYTES
PERFORMANCE
LITHIUM ALLOYS
ALUMINIUM ALLOYS
IRON SULFIDES
ELECTRIC-POWERED VEHICLES
SERVICE LIFE
LITHIUM FLUORIDES
LITHIUM IODIDES
LITHIUM CHLORIDES
LITHIUM BROMIDES
POTASSIUM BROMIDES
MOLTEN SALTS
CHEMICAL COMPOSITION
PHASE DIAGRAMS
ELECTRIC CONDUCTIVITY