US 2026/0128307 A1 · POSITIVE ELECTRODE MATERIAL AND PREPARATION METHOD THEREOF, AND LITHIUM-ION BATTERY

Abstract

A positive electrode material and a preparation method thereof, and a lithium-ion battery. The positive electrode material includes: a core layer including Li, Fe, Mn, PO4− ions, and doping element A; a shell layer, where at least a surface portion of the shell layer is coated on an outer surface of the core layer and the shell layer includes a first carbon particle and a second carbon particle; where the doping element A includes at least one element of Al, Mg, Ni, Co, Ti, Ga, Cu, V, Nb, Zr, Ce, In, Zn and Y; a distance difference between the highest point and the lowest point in a single surface of the positive electrode material is not more than 1 nm, and the surface roughness of the positive electrode material is 0.8 μm to 1.6 μm.

Claims20

Dependent claims

A positive electrode material, comprising:

a core layer comprising Li, Fe, Mn, PO4− ions, doping element A;
a shell layer, wherein at least a surface portion of the shell layer is coated on an outer surface of the core layer, and the shell layer comprises a first carbon particle and a second carbon particle;
wherein the doping element A comprises at least one element of A1, Mg, Ni, Co, Ti, Ga, Cu, V, Nb, Zr, Ce, In, Zn, and Y;
a distance difference between a highest point and a lowest point in a single surface of the positive electrode material is not more than 1 nm, and a surface roughness of the positive electrode material is 0.8 μm to 1.6 μm.

1 more element

A preparation method for a positive electrode material, wherein the preparation method comprises the following steps:

S100:
mixing a Li source, a Mn source, a Fe source, a P source, and a dopant containing a doping element A, sequentially performing a preheating treatment, a pulverization treatment, and a drying treatment, and performing a primary sintering treatment under a reducing atmosphere to obtain a first positive electrode material;
S200:
subjecting the first positive electrode material and a first carbon particle to a secondary sintering treatment under the reducing atmosphere to obtain a second positive electrode material;
S300:
adding the second positive electrode material, a second carbon particle and a binder in sequence for premixing treatment, and then performing a tertiary sintering treatment under the reducing atmosphere to obtain the positive electrode material;
wherein the first carbon particle has an average diameter of 1 μm to 5 μm;
the second carbon particle has an average diameter of 0.5 μm to 1 μm.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application

19/424,936Filed 18 Dec 2025

Priority

CN 202311329054.816 Oct 2023

Published

7 May 2026

Term ends

Not estimatedThe source records don’t support an estimate.

Classification28 codes

H01M 4/5825
Of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures,…:…
C01B 25/45
Phosphates: containing plural metal, or metal and ammonium
H01M 4/0471
Processes of manufacture in general: involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal…
H01M 4/136
Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof: electrodes based on…

Positive electrode material and preparation method thereof, and lithium-ion battery

Life of this patent

Positive electrode material and preparation method thereof, and lithium-ion battery

Life of this patent

Abstract

Claims20