US 2015/0086868 A1 · SECONDARY BATTERY

Abstract

An object of one embodiment of the present invention is to provide a secondary battery in which deterioration of charge-discharge cycle characteristics is suppressed, to suppress generation of defects caused by expansion and contraction of an active material in a negative electrode, or to prevent deterioration caused by deformation of a secondary battery. To prevent deterioration, a material that can be alloyed with lithium and fluidified easily is used for a negative electrode. To hold a negative electrode active material over a surface of a current collector, a covering layer that covers the negative electrode active material is provided. Furthermore, a portion where the current collector and the negative electrode active material are in contact with each other is alloyed. In other words, an alloy that is in contact with both the current collector and the negative electrode active material is provided in the negative electrode.

Claims20

Dependent claims

A secondary battery comprising:

a positive electrode;
and
a negative electrode comprising:
a current collector comprising a first metal element;
a negative electrode active material layer comprising a negative electrode active material on the current collector;
and
a covering layer comprising a resin on the negative electrode active material layer,
wherein the negative electrode active material comprises at least one of a second metal element whose melting point is 250° C. or lower and an alloy comprising the second metal element.

5 more elements

Dependencies are inferred from the claim text.

Secondary battery

Life of this patent

Secondary battery

Life of this patent

Abstract

Claims20