US 6,548,208 B1 · Non-aqueous electrolyte secondary battery and its negative electrode

Abstract

A high capacity negative electrode for a non-aqueous electrolyte secondary battery which has low declining rate in discharge capacity caused by charge/discharge cycles by improving the electronic conductivity on the surface of the particles of the negative electrode material. The negative electrode material is formed by coating part of or the entire surface of solid phase A comprising a nucleus particle with the solid phase B. The solid phase A contains silicon as a constituent element. The solid phase B is composed of a solid solution or intermetallic compounds composed of silicon and at least one another element selected from a group comprising of group 2 elements, transition elements, group 12 elements, group 13 elements and group 14 elements (exclusive of carbon and silicon) of the Periodic Table.

Claims13

Dependent claims

A negative electrode for a non-aqueous electrolyte secondary battery using a negative electrode material in which;

one of
a) part of;
and
b) an entire surface of a particle containing at least silicon is coated with one of
i) a solid solution composed of silicon and at least one element selected from a group consisting of group 2 elements, transition elements, group 12 elements, group 13 elements and group 14 elements exclusive of carbon and silicon of the Periodic Table;
and
ii) an intermetallic compound composed of silicon and at least one element selected from a group consisting of group 2 elements, transition elements, group 12 elements, group 13 elements and group 14 elements exclusive of carbon and silicon of the Periodic Table, wherein one of
i) part of;
and
ii) an entire surface of said particle coated with one of the solid solution and intermetallic compound
is coated with a conductive material.

8 more elements

Dependencies are inferred from the claim text.

Non-aqueous electrolyte secondary battery and its negative electrode

Life of this patent

Non-aqueous electrolyte secondary battery and its negative electrode

Life of this patent

Abstract

Claims13