Lithium ion secondary battery and method for preparing the same
AssigneeSamsung Corning Precision Materials Co., Ltd.
InventorShin Jung CHOI
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Abstract
A lithium ion secondary battery and a method for preparing the same are provided. The lithium ion secondary battery includes a positive electrode having a positive active material represented by Formula (1), a negative electrode and an electrolyte, wherein the positive active material is activated by performing a first charge operation with a voltage ranging from 4.5 V to 4.7 V and the voltage is then reduced to less than 4.5 V: aLi2MnO3-(1-a)LiMO2 (1) where M is at least one selected from the group consisting of Ni, Co and Mn, and 0<a<1.
Claims6
A lithium ion secondary battery comprising a positive electrode having a positive active material represented by Formula (1), a negative electrode and an electrolyte, wherein the positive active material is activated by performing a first charge operation with a voltage ranging from 4.5 V to 4.7 V and the voltage is then reduced to less than 4.5 V:
- aLi2MnO3-(1-a)LiMO2 (1)
- where M is at least one selected from the group consisting of Ni, Co and Mn, and 0<a<1.
A method for preparing a lithium ion secondary battery comprising:
- preparing a slurry by mixing a positive active material represented by Formula (1), a conductive agent and a binder;
- preparing a positive electrode by coating the slurry on a positive current collector;
- preparing a battery using the positive electrode by injecting an electrolyte;
- and
- performing initial activation on the prepared battery by performing a first charge operation with a voltage ranging from 4.5 V to 4.7 V:
- aLi2MnO3-(1-a)LiMO2 (1)
- where M is at least one selected from the group consisting of Ni, Co and Mn, and 0<a<1.
Dependencies are inferred from the claim text.