Lithium nickel manganese-containing composite oxide, method for preparation thereof, positive electrode plate, secondary battery and electrical device

Patent metadata

Field	Value
Publication number	US-2025011172-A1
Application number	US-202418888176-A
Country	US
Kind code	A1
Filing date	Sep 18, 2024
Priority date	Sep 8, 2022
Publication date	Jan 9, 2025
Grant date	—

Abstract

The present application provides a lithium nickel manganese-containing composite oxide, a preparation method thereof, and a positive electrode plate, a secondary battery and an electrical device. The lithium nickel manganese-containing composite oxide is a particle with a monocrystal morphology or a quasi-monocrystal morphology, the lithium nickel manganese-containing composite oxide has a spherical or spherical-like grain shape, and the lithium nickel manganese-containing composite oxide has a general formula of Li 1+x Ni 0.5+y M z Mn 1.5−x−y−z−a A a O 4−k , −0.2≤x≤0.5, −0.2≤y≤0.2, 0≤z≤0.2, 0<a≤0.2, 0≤k≤0.2, A includes one or more selected from Si, P and S, M includes one or more selected from a metal-doping element. The lithium nickel manganese-containing composite oxide provided in the present application may improve the capacity exertion, energy density and cycling life of the secondary battery.

First claim

What is claimed is:

1 . A lithium nickel manganese-containing composite oxide, wherein the lithium nickel manganese-containing composite oxide is a particle with a monocrystal morphology or a quasi-monocrystal morphology, the lithium nickel manganese-containing composite oxide has a spherical or spherical-like grain shape, and the lithium nickel manganese-containing composite oxide has a general formula of Li 1+x Ni 0.5+y M z Mn 1.5−x−y−z−a A a O 4−k , −0.2≤x≤0.5, −0.2≤y≤0.2, 0≤z≤0.2, 0<a≤0.2, 0≤k≤0.2, A comprises one or more selected from Si, P and S, M comprises one or more selected from a metal-doping element.

2 . The lithium nickel manganese-containing composite oxide according to claim 1 , wherein a ratio of long diameter L to short diameter S of the lithium nickel manganese-containing composite oxide grain satisfies 1.0≤L/S≤1.25.

3 . The lithium nickel manganese-containing composite oxide according to claim 1 , wherein M comprises one or more selected from Mo, Nb, Ru, Te, Ta, Ce and Yb.

4 . The lithium nickel manganese-containing composite oxide according to claim 1 , wherein,

0.01
≤
a
≤
0.2

;

and
/
or

,

0
<
z
≤

0.2
.

5 . The lithium nickel manganese-containing composite oxide according to claim 1 , wherein,

0.01
≤

z
+
a

≤
0.2

;

and
/
or

,

0
<
z
≤

0.2

and
⁢

1

≤

a
/
z

≤
5.

6 . The lithium nickel manganese-containing composite oxide according to claim 1 , wherein the lithium nickel manganese-containing composite oxide has a 4V plateau charging capacity ratio R satisfying 0<R≤0.125,
the 4V plateau charging capacity ratio R of the lithium nickel manganese-containing composite oxide is measured as follows: assembling a button battery with an electrode plate comprising the lithium nickel manganese-containing composite oxide as a positive electrode and a lithium plate as a negative electrode, charging the battery to 4.95V at a current of 0.1 C, and then charging to a current of 0.05 C at the constant voltage, using a ratio of the charging capacity in the range of 3.5V to 4.4V to the total charging capacity of the button battery as the 4V plateau charging capacity ratio R of the lithium nickel manganese-containing composite oxide.

7 . The lithium nickel manganese-containing composite oxide according to claim 1 , wherein the lithium nickel manganese-containing composite oxide satisfies at least one of the following conditions (1) to (3):
(1) the lithium nickel manganese-containing composite oxide has a volume particle size Dv50 satisfying 3 μm≤Dv50≤16 μm; (2) the lithium nickel manganese-containing composite oxide has a BET specific surface area S0 of ≤0.8m 2 /g; (3) the lithium nickel manganese-containing composite oxide has a tap density TD satisfying 1.5 g/cm 3 <TD≤3.0 g/cm 3 .

8 . The lithium nickel manganese-containing composite oxide according to claim 1 , wherein the lithium nickel manganese-containing composite oxide further has a cladding layer on the surface, the cladding layer comprises one or more selected from a conductive carbon material, a metal oxides, a metal fluoride and a polyanionic material,
optionally, the conductive carbon material comprises one or more selected from soft carbon, hard carbon, graphene and graphene oxide, optionally, the metal oxide comprises one or more selected from Al 2 O 3 , B 2 O 3 , TiO 2 , ZrO 2 , WO 3 , MoO 3 , Y 2 O 3 , Ta 2 O 5 , TeO 2 , and Nb 2 O 5 , optionally, the metal fluoride comprises one or more selected from LiF, AlF 3 , and GaF 3 , optionally, the polyanionic material comprises one or more selected from orthophosphates and fluoro-orthophosphates of at least one element of Li, Ni, Co, Mn, Fe, Nb, Mo, W, Ta and Te.

9 . A preparation method of a lithium nickel manganese-containing composite oxide comprising the following steps:
S1: providing a raw material obtained by mixing a source of element Li, a source of element Ni, a source of element Mn, a source of element A, and an optional source of element M in a predetermined proportion; S2: heating the raw material obtained in S1 to a first temperature T1 under an oxygen-containing atmosphere, maintaining at the first temperature T1 for a first time t1, cooling to room temperature, after which a intermediate product is obtained, 850° C.≤T1≤1100° C.; and S3: heating the intermediate product obtained in S2 to a second temperature T2 under an oxygen-containing atmosphere, maintaining at the second temperature T2 for a second time t2, after which a lithium nickel manganese-containing composite oxide is obtained, 0° C.≤T1−T2≤200° C., and T2≥800° C., wherein the lithium nickel manganese-containing composite oxide is a particle with a monocrystal morphology or quasi-monocrystal morphology, the lithium nickel manganese-containing composite oxide has a spherical or spherical-like grain shape, and the lithium nickel manganese-containing composite oxide has a general formula of Li 1+x Ni 0.5+y M z Mn 1.5−x−y−z−a A a O 4−k , −0.2≤x≤0.5, −0.2≤y≤0.2, 0≤z<0.2, 0<a≤0.2, 0≤k≤0.2, A comprises one or more selected from Si, P and S, M comprises one or more selected from a metal-doping element.

10 . The preparation method according to claim 9 , wherein,

900
⁢
°C

≤

T
⁢
1

≤

1100
⁢
°C

,

optionally
;

and
/
or

,

0
⁢
°C

≤

T
⁢
1

-

T
⁢
2

Assignees

• Contemporary Amperex Technology Hong Kong Ltd

Inventors

• Zhang Zhenguo
• Wang Sihui
• Fan Jingpeng
• Liu Yutong
• Liu Na

Classifications

• C01P2002/32

  spinel-type (AB2O4) · CPC title

• C01G53/54

  of the type (Mn2O4)-, e.g. Li(NixMn2-x)O4 or Li(MyNixMn2-x-y)O4 · CPC title

• C01P2002/52

  containing elements as dopants · CPC title

• C01P2002/54

  one element only · CPC title

• C01P2004/51

  Particles with a specific particle size distribution · CPC title