Importance

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Abstract

The present invention provides a lithium-ion battery. The lithium-ion battery includes: a positive electrode plate including a positive current collector and a positive conductive membrane which is formed on the surface of the positive current collector by coating, drying and compacting a positive mixture slurry containing a positive active material, a positive conductive additive and a positive binder; a negative electrode plate including a negative current collector and a negative conductive membrane which is formed on the surface of the negative current collector by coating, drying and compacting a negative mixture slurry containing a negative active material, a negative conductive additive and a negative binder; a separator; an electrolyte; and a packaging foil. The compacted density of the positive conductive membrane is at a range from 3.9 g/cm³ to 4.4 g/cm³; the compacted density of negative conductive membrane is at a range from 1.55 g/cm³ to 1.8 g/cm³; the ratio of the capacity of the negative active material to the capacity of the positive active material CB is at a range from 1 to 1.4. The lithium-ion battery of the present invention can be charged quickly at high rate, with excellent safety performance and cycle performance.

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First Claim