Positive electrode plate, secondary battery, and power consumption device

JP2026094256APending Publication Date: 2026-06-09CONTEMPORARY AMPEREX TECHNOLOGY (HONG KONG) LIMITED
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
CONTEMPORARY AMPEREX TECHNOLOGY (HONG KONG) LIMITED
Filing Date
2026-02-25
Publication Date
2026-06-09

AI Technical Summary

Benefits of technology

【0005】 従来技術に比べて、本出願の第一の態様の正極板は、少なくとも以下の有益な効果を有する。(1)LiaNibCocM1dM2eOfR´g正極活物質系は、低SOC(荷電状態、即ち残量)箇所でのレート耐性境界が比較的悪く、Li1+xM3nMn1-yA´yP1-zEzO4は、高SOC箇所でのレート耐性境界が比較的悪く、両者を複合して使用することにより、二つの系の欠陥を同時に補い、高低SOC箇所でのレート耐性境界を広げ、それにより急速充電能力を向上させることができ、(2)正極活物質LiaNibCocM1dM2eOfR´gと正極活物質Li1+xM3nMn1-yA´yP1-zEzO4とを混合することにより、さらに電池に比較的高いエネルギー密度と比較的良いサイクル性能とを兼ね備えさせ、耐用年数を延ばすことができ、(3)メカニズムは明確ではないが、発明者は、正極活物質層におけるMn元素の含有量、正極活物質層の厚さ及び面密度並びに正極板の抵抗が上記式の範囲を満たすように制御することにより、急速充電能力、エネルギー密度及びサイクル性能を同時に保証し、良好なサイクル寿命を有する急速充電正極板を得ることができることを見出した。

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Abstract

正極活物質の高低電圧箇所でのレート耐性境界を広げ、急速充電能力を向上させ、長い耐用年数を保証する正極板を提供する。【解決手段】正極板は、正極活物質層を含み、正極活物質層は、第一の正極活物質及び第二の正極活物質を含み、第一の正極活物質は、LiaNibCocM1dM2eOfR´gを含み、第二の正極活物質は、Li1+xM3nMn1-yA´yP1-zEzO4を含み、正極板は、下記式(I)を満たし、ここで、w(Mn)は、正極活物質層におけるMnの質量分率であり、dは、正極活物質層の厚さであり、単位は、mmであり、Tは、正極板の単位面積当たりの正極活物質層の重量であり、単位は、g / cm2であり、Rは、正極板の25℃におけるシート抵抗であり、単位は、Ωである。JPEG2026094256000061.jpg14170
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Claims

1. A positive electrode plate, wherein the positive electrode plate includes a positive electrode active material layer, and the positive electrode active material layer includes a first positive electrode active material and a second positive electrode active material. The first positive electrode active material contains Li ａ Ni ｂ Co ｃ M １ｄ M ２ｅ O ｆ R´ ｇ where 0.75 ≦ a ≦ 1.2, 0 < b < 1, 0 < c < 1, 0 < d < 1, 0 ≦ e ≦ 0.2, 1 ≦ f ≦ 2.5, 0 ≦ g ≦ 1, and f + g ≦ 3, and M １ is the Mn element and / or the Al element, and M ２ contains one or more elements selected from Zr, Zn, Cu, Cr, Mg, Fe, V, Ti, Sr, Sb, Y, W, and Nb, and R´ contains one or more elements selected from N, F, S, and Cl. The second positive electrode active material is Li １＋ｘ M ３ｎ Mn １－ｙ A' ｙ P １－ｚ E ｚ O ４ Including, where -0.100 ≤ x ≤ 0.100, 0 ≤ n ≤ 1.1, 0.001 ≤ y ≤ 0.500, 0 ≤ z ≤ 0.100, M ３ A' contains one or more elements from Zn, Al, Na, K, Mg, Nb, Mo, and W; A' contains one or more elements from Zn, Al, Na, K, Mg, Mo, W, Ti, V, Zr, Fe, Ga, Sn, Sb, Nb, and Ge; E contains one or more elements from B, Si, N, S, F, Cl, and Br. The positive electrode plate is [Math 1] Satisfying the conditions, Here, lol （Ｍｎ） This is the mass fraction of Mn in the positive electrode active material layer, d is the thickness of the positive electrode active material layer, and its unit is mm. T is the weight of the positive electrode active material layer per unit area of ​​the positive electrode plate, and its unit is g / cm³. ２ And, R is the resistance of the positive electrode plate at 25°C, and its unit is Ω. 【Request Item 2】 【Number 2】 Therefore, selectively, [Math 3] And here, w （Ａ´） w is the mass fraction of A' in the positive electrode active material layer, （Ｐ） The positive electrode plate according to claim 1, wherein is the mass fraction of P in the positive electrode active material layer.

3. 0.01 ≤ w （Ａ´） A positive electrode plate according to claim 1 or 2, wherein the coefficient is ≤0.

05.

4. The second positive electrode active material includes at least one of the following two positive electrode active materials: (i) 0.001 ≤ y ≤ 0.500, n = 0, the second positive electrode active material is Li １＋ｘ Mn １－ｙ A' ｙ P １－ｚ E ｚ O ４ And, (ii) 0.001 ≤ y ≤ 0.500, 0.9 ≤ n ≤ 1.1, the second positive electrode active material is Li １＋ｘ M ３ｎ Mn １－ｙ A' ｙ P １－ｚ E ｚ O ４ And, Selectively, the second positive electrode active material is (ii) Li １＋ｘ Mn １－ｙ A' ｙ P １－ｚ E ｚ O ４ The positive electrode plate according to any one of claims 1 to 3.

5. A positive electrode plate according to any one of claims 1 to 4, wherein 0.032 ≤ T ≤ 0.043, and selectively, 0.035 ≤ T ≤ 0.

039.

6. A positive electrode plate according to any one of claims 1 to 5, wherein 0.11 ≤ d ≤ 0.16, and selectively 0.12 ≤ d ≤ 0.

14.

7. A positive electrode plate according to any one of claims 1 to 6, wherein 0 < R ≤ 1.2, and selectively 0 < R ≤ 1.

8. M １ The positive electrode plate according to any one of claims 1 to 7, wherein the element is Mn. [Request Item 9] [Number 4] Therefore, selectively, [Math 5] And, more selectively, [Math 6] And, The Dv50 particle size of the second positive electrode active material is 0.21 μm to 1.53 μm, selectively 0.32 μm to 1.4 μm, more selectively 0.41 μm to 1.25 μm, also selectively 0.38 μm to 1.1 μm, and yet again selectively 0.47 μm to 0.91 μm. The specific surface area of ​​the second positive electrode active material is 9.2 m². ２ / g ~ 23.6m ２ / g, and selectively 10.5m ２ / g ~ 19.6m ２ / g, and further selectively 12.0m ２ / g ~ 16.2m ２ It is / g, and also selectively 10.0m ２ / g ~ 21.5m ２ / g, and further selectively 10.9m ２ / g ~ 17.6m ２ A positive electrode plate according to any one of claims 1 to 8, wherein the value is / g. [Request Item 10] [Number 7] And, [Number 8] Therefore, selectively, [Number 9] The positive electrode plate according to claim 9.

11. The positive electrode plate according to any one of claims 1 to 10, wherein the Dv50 particle size of the first positive electrode active material is 2.1 μm to 6.3 μm, and selectively 3.5 μm to 4.9 μm.

12. The specific surface area of ​​the first positive electrode active material is 0.3 m². ２ / g to 1.2m ２ It is / g, and selectively 0.5m ２ / g to 0.9m ２ A positive electrode plate according to any one of claims 1 to 11, wherein the value is / g.

13. A positive electrode plate according to any one of claims 1 to 12, wherein a first coating layer is provided on the surface of the first positive electrode active material, and selectively, the first coating layer comprises one or more elements selected from Ti, Al, B, Nb, Zr, Si, and W.

14. The positive electrode plate according to claim 13, wherein the thickness of the first coating layer is 20 nm to 150 nm.

15. A positive electrode plate according to any one of claims 1 to 14, wherein a second coating layer is provided on the surface of the second positive electrode active material, and selectively, the second coating layer comprises at least one of pyrophosphate, phosphate, and carbon.

16. The positive electrode plate according to claim 15, wherein the thickness of the second coating layer is 10 nm to 50 nm.

17. The positive electrode plate according to any one of claims 1 to 16, wherein in the second positive electrode active material, E comprises one or more elements of B, Si, N, and S.

18. The positive electrode plate according to any one of claims 1 to 17, wherein A' in the second positive electrode active material comprises one or more elements selected from Fe, Ti, V, Ni, Co, and Mg.

19. A secondary battery comprising a positive electrode plate according to any one of claims 1 to 18.

20. A power consumption device comprising a positive electrode plate according to any one of claims 1 to 18, and / or a secondary battery according to claim 19.