Method of preparing lithium ion electrochemical cells

Details Method of preparing lithium ion electrochemical cells Method of preparing lithium ion electrochemical cells

1997-08-21

2000-04-11

Nuzzolillo, Maria

Chemistry: electrical current producing apparatus, product, and

Current producing cell, elements, subcombinations and...

Electrode

429224, H01M 402

Patent

active

060486457

ABSTRACT:
In one embodiment, the invention provides a novel active material which is a lithium-rich, manganese oxide active material in the form of a single phase tetragonal crystal structured Li.sub.2 Mn.sub.2 O.sub.4 compound having lattice parameters a=b=5.665 .ANG..+-.0.003 .ANG., and c=9.265 .ANG..+-.0.003 .ANG.. A unique characteristic of the compound is that when lithium ions are deintercalated (extracted) from the Li.sub.2 Mn.sub.2 O.sub.4 at first and second voltage plateaus, the crystal structure is transformed to a cubic structure characterized by lattice parameters a=b=c=8.235 .ANG..+-.0.004 .ANG.. On subsequent charge and discharge of the battery, corresponding to subsequent extraction and reinsertion of lithium into the electrode material at the second voltage plateau, the cubic structure is maintained.

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