Journal
ELECTROCHEMICAL AND SOLID STATE LETTERS
Volume 13, Issue 5, Pages A62-A64Publisher
ELECTROCHEMICAL SOC INC
DOI: 10.1149/1.3338899
Keywords
diffusion; electrochemistry; lithium compounds; nickel compounds; oxidation; particle size; reaction kinetics; secondary cells
Funding
- Natural Sciences and Engineering Research Council (NSERC) of Canada
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Lithium-rich transition-metal oxides lose oxygen during the first removal of lithium. In this study, the kinetics of the oxygen-loss process of the lithium-rich oxide, Li[Li1/9Ni1/3Mn5/9]O-2, of varying particle sizes was studied. The electrochemical data were analyzed, and oxygen diffusion constants of 3x10(-13) and 2x10(-12) cm(2) s(-1) were determined for the oxygen-loss process at 30 and 55 degrees C, respectively. This is about 1000 times smaller than typical lithium diffusion constants in layered oxides. The Li[Li1/9Ni1/3Mn5/9]O-2 material with a 3 mu m particle size was cycled without capacity loss at a specific capacity of 240 mAh g(-1) at 55 degrees C.
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