US 2024/0258496 A1 · POSITIVE ELECTRODE MATERIAL, ELECTROCHEMICAL DEVICE CONTAINING SAME, AND ELECTRONIC DEVICE

Abstract

A positive electrode material includes secondary particles formed from primary particles. The positive electrode material satisfies the following relational expression: 15%≤(Dv50a−Dv50b)/Dv50b≤80%, where Dv50a represents Dv50 directly measured by a laser particle size analyzer for the positive electrode material without ultrasonic treatment, Dv50b represents Dv50 measured by the laser particle size analyzer for the positive electrode material after ultrasonic treatment, and Dv50 represents a particle size of the positive electrode material at a cumulative volume of 50% in a volume-based particle size distribution as measured by starting from small particle sizes. The secondary particles of the positive electrode material that meets the foregoing condition can form soft agglomerates, so that the electrochemical device is of high cycle performance and high safety performance.

Claims20

Dependent claims

A positive electrode material, comprising:

secondary particles, wherein the secondary particles comprise primary particles;
and
the positive electrode material satisfies the following relational expression:
15
⁢
%
≤
(
Dv
⁢
50
⁢
a
-
Dv
⁢
50
⁢
b
)
/
Dv
⁢
50
⁢
b
≤
80
⁢
%
;
wherein, Dv50a represents Dv50 directly measured by a laser particle size analyzer for the positive electrode material without ultrasonic treatment, Dv50b represents Dv50 measured by the laser particle size analyzer for the positive electrode material after ultrasonic treatment, and Dv50 represents a particle size of the positive electrode material at a cumulative volume of 50% in a volume-based particle size distribution as measured by starting from small particle sizes;
the secondary particles further comprise a material layer, the material layer is disposed on at least a part of a surface of the secondary particles, and the material layer comprises at least one of elements B, P, Al, Zr, C, or S.

30 more elements

An electrochemical device, comprising:

a negative electrode;
a separator;
and
a positive electrode, comprising a positive electrode material,
wherein the positive electrode material comprises secondary particles, the secondary particles comprise primary particles;
and
the positive electrode material satisfies the following relational expression:
15
⁢
%
≤
(
Dv
⁢
50
⁢
a
-
Dv
⁢
50
⁢
b
)
/
Dv
⁢
50
⁢
b
≤
80
⁢
%
;
wherein, Dv50a represents Dv50 directly measured by a laser particle size analyzer for the positive electrode material without ultrasonic treatment, Dv50b represents Dv50 measured by the laser particle size analyzer for the positive electrode material after ultrasonic treatment, and Dv50 represents a particle size of the positive electrode material at a cumulative volume of 50% in a volume-based particle size distribution as measured by starting from small particle sizes;
the secondary particles further comprise a material layer, the material layer is disposed on at least a part of a surface of the secondary particles, and the material layer comprises at least one of elements B, P, Al, Zr, C, or S.

34 more elements

An electronic device, comprising an electrochemical device, the electrochemical device comprising:

a negative electrode;
a separator;
and
a positive electrode, comprising a positive electrode material,
wherein the positive electrode material comprises secondary particles, the secondary particles comprise primary particles;
and
the positive electrode material satisfies the following relational expression:
15
⁢
%
≤
(
Dv
⁢
50
⁢
a
-
Dv
⁢
50
⁢
b
)
/
Dv
⁢
50
⁢
b
≤
80
⁢
%
wherein, Dv50a represents Dv50 directly measured by a laser particle size analyzer for the positive electrode material without ultrasonic treatment, Dv50b represents Dv50 measured by the laser particle size analyzer for the positive electrode material after ultrasonic treatment, and Dv50 represents a particle size of the positive electrode material at a cumulative volume of 50% in a volume-based particle size distribution as measured by starting from small particle sizes.

32 more elements

Dependencies are inferred from the claim text.

Positive electrode material, electrochemical device containing same, and electronic device

Life of this patent

Positive electrode material, electrochemical device containing same, and electronic device

Life of this patent

Abstract

Claims20