Li/Li(1+x)V/sub 3/O/sub 8/ secondary batteries. III. Further characterization of the mechanism of Li(+) insertion and of the cycling behavior
- Roma, Universita, Rome, Italy
The reduction mechanism of the bronze Li(1.2)V3O8 in nonaqueous Li cells has been elucidated. Upon Li(+) insertion, a solid solution is formed with an upper composition of Li(approximately 3)V3O8. Within this composition range, Li(+) progressively fills the tetrahedral sites available in the unit cell. Four such sites are supposed to be filled at the upper composition limit. Beyond this, a new phase is nucleated to accommodate excess Li(+), this resulting in a constant cell's OCV. Li(+) insertions not greater than 3.0 eq/mol are reversible, as shown by the cycling behavior and the X-ray paterns. Owing to the outstanding structure stability and to the high speed of Li(+) diffusion in Li(1.2)V3O8, extended cycling at high rates is achievable with cells based on this bronze. 445 cycles at discharge rates variable in the range of 2-10 mA/sq cm have been obtained. 13 references.
- Research Organization:
- CNR, Centro di Studio per la Elettrochimica e la Chimica Fisica delle Interfasi, Rome, Italy
- OSTI ID:
- 5533684
- Journal Information:
- J. Electrochem. Soc.; (United States), Vol. 132
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
METAL-METAL OXIDE BATTERIES
SPECIFICATIONS
CRYSTAL STRUCTURE
LITHIUM
SOLID SOLUTIONS
VANADIUM OXIDES
ALKALI METALS
CHALCOGENIDES
DISPERSIONS
ELECTRIC BATTERIES
ELECTROCHEMICAL CELLS
ELEMENTS
METALS
MIXTURES
OXIDES
OXYGEN COMPOUNDS
SOLUTIONS
TRANSITION ELEMENT COMPOUNDS
VANADIUM COMPOUNDS
250900* - Energy Storage- Batteries