US 12,731,787 B2Granted

Positive electrode material, positive electrode plate and battery

AssigneeBYD Company Limited

InventorsNa Chen, Minghao Zhuang, Rong Hao, Yi Pan

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Abstract

A positive electrode material includes a first lithium manganese iron phosphate material in an aggregate form, a second and third lithium manganese iron phosphate materials in an aggregate and/or single-crystal-like form, and a fourth and fifth lithium manganese iron phosphate materials in a single-crystal-like form. A particle quantity ratio of the first to fifth lithium manganese iron phosphate materials is (0.8 to 1.2):(0.8 to 1.2):(1.6 to 2.4):(6.4 to 9.6):(6.4 to 9.6), and particle size D50 relationships satisfy: D505<D504<D503<D502<D501, D502=aD501, D503=bD501, D504=cD501, D505=dD501, and 5 μm≤D501≤15 μm, where 0.35≤a≤0.5, 0.2≤b≤0.27, 0.17≤c≤0.18, and 0.15≤d≤0.16.

Claims18

Dependent claims

A positive electrode material, comprising:

a first lithium manganese iron phosphate material, a second lithium manganese iron phosphate material, a third lithium manganese iron phosphate material, a fourth lithium manganese iron phosphate material and a fifth lithium manganese iron phosphate material, wherein
a particle quantity ratio between the first lithium manganese iron phosphate material, the second lithium manganese iron phosphate material, the third lithium manganese iron phosphate material, the fourth lithium manganese iron phosphate material, and the fifth lithium manganese iron phosphate material is (0.8 to 1.2):(0.8 to 1.2):(1.6 to 2.4):(6.4 to 9.6):(6.4 to 9.6),
the first lithium manganese iron phosphate material is an aggregate, the fourth lithium manganese iron phosphate material and the fifth lithium manganese iron phosphate material are single-crystal-like, the second lithium manganese iron phosphate material and the third lithium manganese iron phosphate material are aggregates and/or single-crystal-like, and particle size relationships thereof satisfy:
D
50
5
<
D
50
4
<
D
50
3
<
D
50
2
<
D
50
1
,
D
50
2
=
aD
50
1
,
D
50
3
=
bD
50
1
,
D
50
4
=
cD
50
1
,
D
50
5
=
dD
50
1
,
and
⁢
5
⁢
μm
≤
D
50
1
≤
15
⁢
μm
,
wherein, D501 to D505 represent particle sizes D50 of the first lithium manganese iron phosphate material to the fifth lithium manganese iron phosphate material, a is in a range of 0.35 to 0.5 inclusive, b is in a range of 0.2 to 0.27 inclusive, c is in a range of 0.17 to 0.18 inclusive, and d is in a range of 0.15 to 0.16 inclusive.

67 more elements

A positive electrode plate, comprising a current collector and a positive electrode material layer disposed on the current collector, wherein the positive electrode material layer comprises a positive electrode material, and the positive electrode material comprises:

a first lithium manganese iron phosphate material, a second lithium manganese iron phosphate material, a third lithium manganese iron phosphate material, a fourth lithium manganese iron phosphate material and a fifth lithium manganese iron phosphate material,
a particle quantity ratio between the first lithium manganese iron phosphate material, the second lithium manganese iron phosphate material, the third lithium manganese iron phosphate material, the fourth lithium manganese iron phosphate material, and the fifth lithium manganese iron phosphate material is (0.8 to 1.2):(0.8 to 1.2):(1.6 to 2.4):(6.4 to 9.6):(6.4 to 9.6), the first lithium manganese iron phosphate material is an aggregate, the fourth lithium manganese iron phosphate material and the fifth lithium manganese iron phosphate material are single-crystal-like, the second lithium manganese iron phosphate material and the third lithium manganese iron phosphate material are aggregates and/or single-crystal-like, and particle size relationships thereof satisfy:
D
50
5
<
D
50
4
<
D
50
3
<
D
50
2
<
D
50
1
,
D
50
2
=
aD
50
1
,
D
50
3
=
bD
50
1
,
D
50
4
=
cD
50
1
,
D
50
5
=
dD
50
1
,
and
⁢
5
⁢
μm
≤
D
50
1
≤
15
⁢
μm
,
wherein, D501 to D505 represent particle sizes D50 of the first lithium manganese iron phosphate material to the fifth lithium manganese iron phosphate material, a is in a range of 0.35 to 0.5 inclusive, b is in a range of 0.2 to 0.27 inclusive, c is in a range of 0.17 to 0.18 inclusive, and d is in a range of 0.15 to 0.16 inclusive.

66 more elements

A battery, comprising a positive electrode plate comprising a current collector and a positive electrode material layer disposed on the current collector, wherein the positive electrode material layer comprises a positive electrode material, and the positive electrode material comprises:

a first lithium manganese iron phosphate material, a second lithium manganese iron phosphate material, a third lithium manganese iron phosphate material, a fourth lithium manganese iron phosphate material and a fifth lithium manganese iron phosphate material,
a particle quantity ratio between the first lithium manganese iron phosphate material, the second lithium manganese iron phosphate material, the third lithium manganese iron phosphate material, the fourth lithium manganese iron phosphate material, and the fifth lithium manganese iron phosphate material is (0.8 to 1.2):(0.8 to 1.2):(1.6 to 2.4):(6.4 to 9.6):(6.4 to 9.6),
the first lithium manganese iron phosphate material is an aggregate, the fourth lithium manganese iron phosphate material and the fifth lithium manganese iron phosphate material are single-crystal-like, the second lithium manganese iron phosphate material and the third lithium manganese iron phosphate material are aggregates and/or single-crystal-like, and particle size relationships thereof satisfy:
D
50
5
<
D
50
4
<
D
50
3
<
D
50
2
<
D
50
1
,
D
50
2
=
aD
50
1
,
D
50
3
=
bD
50
1
,
D
50
4
=
cD
50
1
,
D
50
5
=
dD
50
1
,
and
⁢
5
⁢
μm
≤
D
50
1
≤
15
⁢
μm
,
wherein, D501 to D505 represent particle sizes D50 of the first lithium manganese iron phosphate material to the fifth lithium manganese iron phosphate material, a is in a range of 0.35 to 0.5 inclusive, b is in a range of 0.2 to 0.27 inclusive, c is in a range of 0.17 to 0.18 inclusive, and d is in a range of 0.15 to 0.16 inclusive.

67 more elements

Dependencies are inferred from the claim text.

Facts

Application: 18/122,538Filed 16 Mar 2023 · continuation
Priority: CN 202010989423.618 Sep 2020
Published: US 2023/0223534 A113 Jul 2023
Granted: 8 Sep 2026
Term ends: Not estimatedThe source records don’t support an estimate.

Classification25 codes

H01M 4/5825
Of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures,…:…
H01M 10/0525
Li-accumulators: rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
C01B 25/45
Phosphates: containing plural metal, or metal and ammonium
H01M 4/131
Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof: electrodes based on…