US 2012/0070708 A1 · CATHODE ACTIVE MATERIAL, CATHODE AND NONAQUEOUS SECONDARY BATTERY

Abstract

A cathode active material of the present invention is a cathode active material having a composition represented by General Formula (1) below, LiFe1-xMxP1-ySiyO4 (1), where: an average valence of Fe is +2 or more; M is an element having a valence of +2 or more and is at least one type of element selected from the group consisting of Zr, Sn, Y, and Al; the valence of M is different from the average valence of Fe; 0<x≦0.5; and y=x×({valence of M}−2)+(1−x)×({average valence of Fe}−2). This provides a cathode active material that not only excels in terms of safety and cost but also can provide a long-life battery.

Claims18

Dependent claims

A cathode active material having a composition represented by General Formula (1) below,

LiFe1-xMxP1-ySiyO4 (1),
where:
an average valence of Fe is +2 or more;
M is an element having a valence of +2 or more and is at least one type of element selected from the group consisting of Zr, Sn, Y, and Al;
the valence of M is different from the average valence of Fe;
0<x≦0.5;
and
y=x×({valence of M}−2)+(1−x)×({average valence of Fe}−2).

5 more elements

Dependencies are inferred from the claim text.

Facts

Application

13/321,717Filed 20 May 2010

Priority

JP 2009-12464722 May 2009

Published

22 Mar 2012

Term ends

Not estimatedThe source records don’t support an estimate.

Classification21 codes

H01M 4/5825
Of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures,…:…
H01M 4/131
Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof: electrodes based on…
H01M 4/136
Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof: electrodes based on…
H01M 4/525
Of nickel, cobalt or iron: of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g.…

Cathode active material, cathode and nonaqueous secondary battery

Life of this patent

Cathode active material, cathode and nonaqueous secondary battery

Life of this patent

Abstract

Claims18