Negative electrode for lithium secondary cell and lithium secondary cell
1 Assignment
0 Petitions
Accused Products
Abstract
A negative electrode for a lithium secondary cell having a collector composed of an electroconductive metal foil and, provided on the surface thereof, an active material layer containing active material particles containing silicon and/or a silicon alloy and a binder, characterized in that the binder has mechanical characteristics of a tensile strength of 50 N/mm2 or more, an elongation at break of 10% or more, a strain energy density of 2.5×10−3 J/mm3 or more and a coefficient of elasticity of 10000 N/mm2 or less, and preferably characterized in that the collector has mechanical characteristics of a tensile strength of 80 N/mm2 or more, a proportional limit 30 N/mm2 or more, an elongation at break of 1.0% or more and an elastic elongation limit of 0.03% or more.
51 Citations
22 Claims
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1. (canceled)
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2. A negative electrode for a rechargeable lithium battery which includes a conductive metal foil current collector and an active material layer provided on a surface of the current collector and comprising a binder and particles of active material containing silicon and/or a silicon alloy;
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said negative electrode characterized in that said current collector has mechanical properties of at least 80 N/mm2 tensile strength, at least 30 N/mm2 proportional limit, at least 1.0% elongation at break and at least 0.03% elastic elongation limit and said binder has mechanical properties of at least 50 N/mm2 tensile strength, at least 10% elongation at break, at least 2.5×
10−
3 J/mm3 strain energy density and up to 10,000 N/mm2 elastic modulus;
after provision of said active material layer on the surface of said current collector, heat treatment being carried out at a temperature higher than a glass transition temperature of said binder to improve adhesion of the binder to the current collector. - View Dependent Claims (3, 4, 5, 6, 7, 8, 11, 13, 14, 15, 17, 20, 21, 22)
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9-10. -10. (canceled)
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12. (canceled)
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16. (canceled)
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18-19. -19. (canceled)
Specification