Rechargeable lithium cells with high energy density transition metal compound cathodes - characterization in aa-size cells. Final report, 24 September 1989-1 March 1992

Technical Report · Mon Apr 01 04:00:00 EST 1996

OSTI ID:451282

Lin, H P.W.; Kelly, C J; Chua, D L; Smith, P H; James, S D

Lithium/lithium cobalt oxide cells were packaged in Size AA containers. Cell capacity was 0.85 Ah for discharge of the Li(x)CoO2 cathode over the range of x from zero to unity (100 percent depth of discharge (DOD)). Cells were discharged at 37.5, 50, and 75 percent DOD. The latter depth was unusually severe as this system is typically limited to about 50 percent DOD. Cycling at cathode current densities of 1, 5, and 10 ma/sq cm and at both zero and 22 deg C allowed comparison to previously-evaluated lithium cells with other cathode materials. While the results generally were in agreement with data for 7- to 30-Ah Li/Li(x)CoO2 cells, two findings were unexpected. First, five to ten cycles could be obtained at the highest DOD before a continuously declining capacity fell below that obtained at 50 percent DOD, and useful cycles were attained thereafter. Second, at 37.5 DOD, twice the number of cycles were obtained at 22 deg C as at {minus} 2 deg C. In all previous testing, no temperature dependence had been observed. The limited number of replicates in this test prompts caution interpreting the results.

• Research Organization: Naval Surface Warfare Center, Silver Spring, MD (United States)
• OSTI ID: 451282
• Report Number(s): AD-A--318903/2/XAB; CNN: Contract N60921-89-D-0039
• Country of Publication: United States
• Language: English

Related Subjects

25 ENERGY STORAGE
CATHODES
COBALT OXIDES
LITHIUM
METAL-METAL OXIDE BATTERIES
PERFORMANCE TESTING
PROGRESS REPORT
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENTS