Electrolyte and battery using the same
First Claim
1. An electrolyte, applied on a cathode or an anode of a battery, said electrolyte comprising:
- a first high molecular weight compound with a weight-average molecular weight of more than 550,000 and less than 1,000,000;
a second high molecular weight compound with a weight-average molecular weight of 1,000 or more and equal to or less than approximately 150,000; and
a third high molecular weight compound with a weight-average molecular weight of more than 300,000 but less than 550,000,wherein each of the first, second and third high molecular weight compounds is a block copolymer of vinylidene fluoride and hexafluoropropylene having a melting point of approximately 150°
C.; and
wherein the first high molecular weight compound has a weight percentage of the electrolyte of 30% or more, and further wherein there is a difference of approximately 200,000-300,000 weight-average molecular weight between the first and third high molecular weight compounds and of approximately 150,000-350,000 weight-average molecular weight between the second and third high molecular weight compounds.
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Accused Products
Abstract
Provided are an electrolyte having superior adhesion strength to an electrode and superior permeability into the electrode, and a battery using the electrolyte. An electrolyte comprises, for example, a high molecular weight compound and an electrolyte solution prepared by dissolving an electrolyte salt in a solvent, and the electrolyte is formed through applying a coating solution prepared by dissolving the high molecular weight compound in a mixed solvent to at least either a cathode or an anode. The high molecular weight compound includes a first high molecular weight compound with a weight-average molecular weight of 550,000 or more and a second high molecular weight compound with a weight-average molecular weight of 1,000 or more but not exceeding 300,000. Thereby, the adhesion strength of the electrolyte to the electrode, the permeability of the electrolyte into the electrode and the mechanical strength of the electrolyte can be improved, and the capability of holding a solvent can be improved.
5 Citations
11 Claims
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1. An electrolyte, applied on a cathode or an anode of a battery, said electrolyte comprising:
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a first high molecular weight compound with a weight-average molecular weight of more than 550,000 and less than 1,000,000; a second high molecular weight compound with a weight-average molecular weight of 1,000 or more and equal to or less than approximately 150,000; and a third high molecular weight compound with a weight-average molecular weight of more than 300,000 but less than 550,000, wherein each of the first, second and third high molecular weight compounds is a block copolymer of vinylidene fluoride and hexafluoropropylene having a melting point of approximately 150°
C.; andwherein the first high molecular weight compound has a weight percentage of the electrolyte of 30% or more, and further wherein there is a difference of approximately 200,000-300,000 weight-average molecular weight between the first and third high molecular weight compounds and of approximately 150,000-350,000 weight-average molecular weight between the second and third high molecular weight compounds. - View Dependent Claims (2, 3, 8)
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4. A battery, comprising:
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a cathode; an anode; and an electrolyte, wherein the cathode comprises a cathode active material layer and a cathode current collector; wherein the electrolyte is applied on the cathode or the anode, said electrolyte comprising; a first high molecular weight compound with a weight-average molecular weight of more than 550,000 and less than 1,000,000; a second high molecular weight compound with a weight-average molecular weight of 1,000 or more and equal to or less than approximately 150,000; and a third high molecular weight compound with a weight-average molecular weight of more than 300,000 but less than 550,000, wherein each of the first, second and third high molecular weight compounds is a block copolymer of vinylidene fluoride and hexafluoropropylene having a melting point of approximately 150°
C.;wherein the first high molecular weight compound has a weight percentage of the electrolyte of 30% or more, and wherein the cathode active material layer that is comprised of a complex oxide of lithium and a transition metal, and a thickness of the cathode including a thickness of the cathode current collector is 120 μ
m or more and further wherein there is a difference of approximately 200,000-300,000 weight-average molecular weight between the first and third high molecular weight compounds and of approximately 150,000-350,000 weight-average molecular weight between the second and third high molecular weight compounds. - View Dependent Claims (5, 6, 7, 9, 10, 11)
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Specification