Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
11020207 | Journal of Power Sources | 2018 | 11 Pages |
Abstract
The electrochemical performances of Li4Mn5O12 powders prepared via an aqueous sol-gel method using either citric acid or l-lysine as complexing and combusting agent are compared. At current rate of 0.1â¯C, a discharge capacity of 163 mAh gâ1 and a good cyclability are obtained for powder cathode materials prepared with l-lysine and processed as composite electrode. Films of the corresponding Li4Mn5O12 were deposited by direct spray coating of precursors' solutions and subsequent thermal treatment at 400â¯Â°C. Films exhibit better electrochemical performances than powders with a discharge capacity of up to 165 mAh gâ1 at 0.1â¯C and a capacity retention of 95% after 100 cycles at 0.5â¯C and 89% after 100 cycles at 2â¯C. Increasing the active material loading up to 2â¯mgâ¯cmâ2 leads to a small loss of cyclability, especially at high cycling rates, but a specific capacity of 275 μAh cmâ2 is still achieved at 2â¯C. These values of specific capacities are higher than those observed in the literature for lithium manganese oxide films.
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Authors
Christelle Alié, Cédric Calberg, Carlos Páez, Dimitri Liquet, David Eskenazi, Benoît Heinrichs, Nathalie Job,