Effect of niobium doping on the properties of molybdenum sulfides as cathode materials

Technical Report · Fri Jan 01 04:00:00 EST 1988

OSTI ID:5687587

Dunn, B; Shin, H; Doerr, H J; Despandey, C; Fuqua, P

Poorly crystalline molybdenum sulfides are promising candidates as cathode materials which require good electronic and ionic conductivity. Poorly crystalline molybdenum sulfide films with a large range of sulfur contents were successfully synthesized by the activated reactive evaporation technique. Raman spectra of the poorly crystalline films showed dual structure characteristics corresponding to {sup 2}H-MoS{sub 2} and amorphous MoS{sub 3}. The films with the above structure demonstrated significantly improved intercalation ratios of lithium atoms, thereby enhancing the energy density of the secondary lithium batteries. However, the current density was lower because of the high electronic resistivity of the films. Niobium, acting as an acceptor, was, therefore, doped into the molybdenum sulfide films to decrease the electronic resistivity. Decrease in the resistivity by about three orders of magnitude was observed.

• Research Organization: California Univ., Los Angeles, CA (USA). School of Engineering and Applied Science
• OSTI ID: 5687587
• Report Number(s): AD-A-209098/3/XAB
• Country of Publication: United States
• Language: English

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ALKALI METALS
ALLOYS
ATOMS
CATHODES
CHARGED PARTICLES
CRYSTAL DOPING
ELECTRIC BATTERIES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTROCHEMICAL CELLS
ELECTRODES
ELECTRONS
ELEMENTARY PARTICLES
ELEMENTS
EVAPORATION
FERMIONS
FILMS
IONS
LEPTONS
LITHIUM
MATERIALS
METALLURGICAL EFFECTS
METALS
MOLYBDENUM COMPOUNDS
MOLYBDENUM SULFATES
NIOBIUM ADDITIONS
NIOBIUM ALLOYS
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
RAMAN SPECTRA
REFRACTORY METAL COMPOUNDS
SPECTRA
SULFATES
SULFUR COMPOUNDS
TRANSITION ELEMENT COMPOUNDS