US2023268498A1PendingUtilityA1
Positive electrode material and preparation method and use therefor, lithium-ion battery positive electrode pole piece, and lithium-ion battery
Assignee: BEIJING EASPRING MAT TECH CO LTDPriority: Jun 30, 2021Filed: Aug 16, 2021Published: Aug 24, 2023
Est. expiryJun 30, 2041(~14.9 yrs left)· nominal 20-yr term from priority
H01M 2004/021H01M 4/505H01M 4/525H01M 4/0471H01M 4/0492H01M 4/622H01M 4/625H01M 10/0525H01M 2004/028H01M 4/362H01M 4/131H01M 4/364H01M 4/628Y02E60/10H01M 4/366H01M 4/62H01M 4/485
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Claims
Abstract
The present disclosure relates to the technical field of secondary battery, and discloses a positive electrode material and a preparation method and use therefor, a lithium-ion battery positive electrode poly piece, and a lithium-ion battery.
Claims
exact text as granted — not AI-modified1 . A cathode material comprising multicrystal particles A and single crystal particles or quasi single crystal particles B;
the particle diameters D 5 , D 50 and D 95 of the cathode material satisfy the relationship shown in Formula I: 1.5 ≤ K95 = D 95 -D 5 / D 50 ≤ 2.5 Formula I.
2 . The cathode material of claim 1 , wherein 1.5≤K95≤2.
3 . The cathode material of claim 1 , wherein the multicrystal particles A have a particle diameter D 50 within a range of 7-22 µm;
and/or, the particle diameters D 5 , D 50 and D 95 of the multicrystal particles A satisfy the relationship shown in Formula II:
0 < K A 95 = D 95 -D 5 / D 50 ≤ 1 Formula II;
and/or, the single crystal particles or quasi single crystal particles B have a particle diameter D 50 within a range of 0.2-7 µm;
and/or, the particle diameters D 5 , D 50 and D 95 of the single crystal particles or quasi single crystal particles B satisfy the relationship shown in Formula III:
0.2
<
K
B
95
=
D
95
-D
5
/
D
50
≤
3
Formula III.
4 . The cathode material of claim 1 , wherein the cathode material has a composition represented by Formula (1):
Li 1 +a Ni x Co y Mn z M 1-x-y-z N k O 2 -w J w (1) in the Formula (1), 0≤a≤0.3, 0<x≤1, 0≤y≤1, 0≤z≤1, 0≤k≤0.1, 0≤w≤0.1, M is at least one selected from the group consisting of B, Na, K, Mg, Al, Ca, Ti, Fe, Zn, Sr, Y, Zr, Nb, Mo, Sn, Ba, Ta and W; N is at least one selected from the group consisting of B, Mg, Al, Ti, V, Sr, Y, Zr, Nb, Mo and W; J is at least one selected from the group consisting of F, Cl and P.
5 . The cathode material of claim 1 , wherein the surface of the multicrystal particles A is coated with a cladding layer P;
and/or, a mass ratio of the multicrystal particles A to the cladding layer P is 1:0-0.05, based on the total weight of the multicrystal particles A.
6 . The cathode material of claim 5 , wherein the cladding layer P is provided by conductive graphite and/or conductive polymer;
and/or, the conductive polymer is at least one selected from the group consisting of polyaniline, polypyrrole, polythiophene, polyacetylene, poly(paraphenylene sulfide), poly(3,4-ethylenedioxythiophene) and polyphenylacetylene.
7 . The cathode material of claim 1 , wherein a mass ratio of the multicrystal particles A to the single crystal particles or quasi single crystal particles B in the cathode material is 0.01-9:1.
8 . The cathode material of claim 1 , wherein an individual particle strength of the multicrystal particles A in a test of the micro-mechanical testing machine is greater than or equal to 50 MPa;
a deformation quantity of the multicrystal particles A prior to fracture is within a range D 50 ×(5-25%) of the multicrystal particles A.
9 . The cathode material of claim 1 , wherein the cathode material has a powder compaction density greater than or equal to 3.5 g/cm 3 under a pressure condition of 20 kN;
and/or, a specific surface area of the cathode material is denoted as A1, the specific surface area of the cathode material after a pressure fracturing of 4.5 T is denoted as A2;
wherein
A2-A1 / A1 × 100 % ≤ 40 %
.
10 . A method for preparing a cathode material of claim 1 comprising the following steps:
(1) subjecting a transition metal precursor Ni x1 Co y1 Mn z1 (OH) 2 , lithium salt, and an optional additive to blending and a first sintering to obtain a first sintered material;
(2) subjecting the first sintered material and an optional conductive graphite and/or conductive polymer to blending and a second sintering to obtain multicrystal particles A;
(3) subjecting a transition metal precursor Ni x2 Co y2 Mn z2 (OH) 2 , lithium salt and an optional additive to blending and a third sintering to obtain single crystal particles or quasi single crystal particles B;
(4) mixing the multicrystal particles A with the single crystal particles or quasi single crystal particles B to prepare the cathode material;
wherein
x1+y1+z1=1, 0 .5 ≤ x1 ≤ 1, 0 ≤ y1 ≤ 0 .5, 0 ≤ z1 ≤ 0 .5; x2+y2+z2=1, 0 .5 ≤ x2 ≤ 1, 0 ≤ y2 ≤ 0 .5, 0 ≤ z2 ≤ 0 .5, -0 .05 ≤ x1-x2 ≤ 0 .05
.
11 . The method of claim 10 , wherein the additive is at least one selected from the group consisting of lithium compounds, boron compounds, tungsten compounds, neodymium compounds, aluminum compounds, zirconium compounds, magnesium compounds and chlorides.
12 . The method of claim 10 , wherein the molar ratio of the transition metal precursor Ni x1 Co y1 Mn z1 (OH) 2 , the lithium salt and the additive in step (1) is 1:0.99-1.1:0-1;
and/or, the first sintering conditions comprise a sintering temperature of 650-800° C. and a sintering time of 15-30 h; and/or, the first sintering comprises a temperature rise stage and a constant temperature stage; a ratio of the temperature rise time tr of the temperature rise stage to the constant temperature time tc of the constant temperature stage satisfies:
0.5
≤
t
r
/
t
c
≤
2.5
(4)
.
13 . The method of claim 10 , wherein a mass ratio of the first sintered material to the conductive graphite and/or the conductive polymer in step (2) is 1:0-0.05;
and/or, the second sintering conditions comprise a sintering temperature of 100-400° C. and a sintering time of 4-12 h.
14 . The method of claim 10 , wherein a molar ratio of the transition metal precursor Ni x2 Co y2 Mn z2 (OH) 2 , the lithium salt and the additive in step (3) is 1: 0.99-1.1: 0-1;
and/or, the third sintering conditions comprise a sintering temperature of 800-1,000° C. and a sintering time of 15-30 h.
15 . The method of claim 10 , wherein a mass ratio of the multicrystal particles A to the single crystal particles or quasi single crystal particles B is 0.01-9:1.
16 . (canceled)
17 . (canceled)
18 . A lithium ion battery comprising a cathode electrode prepared with the cathode material of claim 1 .Join the waitlist — get patent alerts
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