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US 8,282,855 B2Granted
Composite positive active material of lithium battery and method for manufacturing the same
AssigneeVista Advance Technology Co., Ltd.
InventorYu-Ta Tu
Life of this patent
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Abstract
The composite positive active material of a lithium battery is composed of a main active material containing lithium and a sheathing active material containing lithium, whose particle diameter is far smaller than that of the main active material. A pulp containing these two active materials is sprayed and dried to form a mixed powder. The composite positive active material is obtained by means of sintering the mixed powder.
Claims8
A positive active material of a lithium battery comprising:
- a powder of main active material containing lithium;
- and
- a powder of sheathing active material containing lithium;
- wherein a particle diameter of the powder of main active material is at least ten times as large as that of the powder of sheathing active material, and each particle of the powder of main active material is sinteredly attached by a plurality of particles of the powder of sheathing active material.
1 more element
A method for manufacturing a positive active material of a lithium battery, comprising the steps of:
- a) providing a powder of main active material containing lithium;
- b) providing a powder of sheathing active material containing lithium, whose particle diameter is smaller than that of the powder of main active material by one tenth or lower;
- c) adding a binding agent into the two powders to form a pulp;
- d) spraying and drying the pulp to form a mixed powder;
- and
- e) sintering the mixed powder.
3 more elements
Dependencies are inferred from the claim text.