Multilayer anode and lithium secondary battery including the same
AssigneeSK On Co., Ltd.
InventorsByoung Wook Jo, Jae Kyu Jin
Life of this patent
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Abstract
A multilayer anode includes an anode collector, and a plurality of anode mixture layers sequentially stacked on at least one surface of the anode collector, and including natural graphite as an anode active material. A weight ratio of the natural graphite in innermost and outermost anode mixture layers is greater than a weight ratio of the natural graphite in an anode mixture layer located between the innermost and outermost anode mixture layers, in a stacking direction of the plurality of anode mixture layers. Performance of a cell may be improved and calendering-calender contamination occurring in a calendering process and an electrode stripping phenomenon may be prevented.
Claims10
A multilayer anode comprising:
- an anode collector;
- and a plurality of anode mixture layers on at least one surface of the anode collector,
- wherein the anode mixture layers include an innermost anode mixture layer located on the anode current collector;
- an outermost anode mixture layer located on an outermost side of the anode;
- and an intermediate anode mixture layer located between the innermost anode mixture layer and the outermost anode mixture layer, the intermediate anode mixture layer comprising one or more layers,
- wherein, at least one of the innermost anode mixture layer and the outermost anode mixture layer of the anode mixture layer comprises natural graphite as an anode active material,
- wherein the intermediate anode mixture layer is a carbon-based layer comprising a carbon material as anode active material,
- wherein at least one of a weight ratio of the natural graphite in the innermost anode mixture layer over the total anode active material of the innermost anode mixture layer and a weight ratio of the natural graphite in the outermost anode mixture layer over the total anode active material of the outermost anode mixture layer is greater than a weight ratio of natural graphite in the intermediate anode mixture layer over the total anode active material of the intermediate anode mixture layer.
Dependencies are inferred from the claim text.