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US 6,187,476 B1Granted
Method for making electrode of lithium secondary cells
AssigneeKorean Advanced Institute of Science and Technology Representative
InventorsSu Il Pyun, Yong Min Choe
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Abstract
A method for making an electrode for lithium secondary cells. Lithium and cobalt ions are co-precipitated in an alkaline solution in such a way that the ratio of the former to the latter is 1.05:1 or more and then, are thermally treated to give LiCoO2 powder. This ternary system compound is combined with a current collector and a binder. The electrode has an initial discharge capacity of 160 mAh/g and retains 90% of the initial capacity even after 400 times of charge/discharge cycle.
Claims1
A method for making an electrode for lithium secondary cells, comprising the steps of:
- co-precipitating lithium ions and cobalt ions in a methanol solution including 1M LiOH, 3M NH4OH, Co(OH)2 and ethylene glycol, the ratio of said lithium ions to said cobalt ions being at least 1.05:1;
- subjecting the co-precipitate to calcination and thermal treatment to give LiCoO2 powder;
- and
- mixing the powder with a current collector and a binder.
1 more element
Dependencies are inferred from the claim text.