Secondary battery with improved life characteristics
AssigneesLG Chem, Ltd., Toray Industries, Inc.
InventorsSung-Hoon Yu, Jung-Don Suk, Seok-Koo Kim, Doo-Kyung Yang, Yoo-Sun Kang, Kyung-Mi Lee, Jin-Hyun Park
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Abstract
The present disclosure refers to a secondary battery which comprises a high-voltage cathode active material and a separator whose pores are not obstructed even though being used together with the high-voltage cathode active material, thereby preventing the obstruction of pores in the separator and the formation of a dendrite in the anode and eventually providing good battery life performance.
Claims20
An electrode assembly comprising a cathode, an anode, and a separator interposed between the cathode and the anode,
- wherein the cathode comprises a cathode active material capable of being applied at a high voltage, and
- the separator comprises a porous substrate and a porous coating layer formed on only one surface of the porous substrate and comprising inorganic particles and an organic binder polymer, and has pores whose longest diameter ranges from 50 nm to 1 μm,
- wherein the porous coating layer is formed in a thickness of 0.5 to 20 μm, and
- wherein the porous coating layer is disposed to be faced with the anode.
An electrode assembly comprising a cathode, an anode, and a separator interposed between the cathode and the anode,
- wherein the cathode comprises a cathode active material capable of being applied at a high voltage, and
- the separator comprises a porous substrate and a porous coating layer formed on only one surface of the porous substrate and comprising inorganic particles and an organic binder polymer, and has pores whose longest diameter ranges from 10 nm to 5 μm,
- wherein the porous coating layer is formed in a thickness of 0.5 to 20 μm, and
- wherein the porous coating layer is disposed to be faced with the anode,
- wherein the inorganic particles have a size of 0.01 to 10 μm.
An electrode assembly comprising a cathode, an anode, and a separator interposed between the cathode and the anode,
- wherein the cathode comprises a cathode active material capable of being applied at a high voltage, and
- the separator comprises a porous substrate and a porous coating layer formed on only one surface of the porous substrate and comprising inorganic particles and an organic binder polymer, and has pores whose longest diameter ranges from 10 nm to 5 μm,
- wherein the porous coating layer is formed in a thickness of 0.5 to 20 μm, and
- wherein the porous coating layer is disposed to be faced with the anode,
- wherein the porous substrate is a porous membrane obtained from a polyethylene resin, a polypropylene/polyethylene/polypropylene resin, or a polypropylene resin.
Dependencies are inferred from the claim text.