Positive electrode active material, electrode, and battery
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- TOYOTA JIDOSHA KK
- Filing Date
- 2024-11-29
- Publication Date
- 2026-06-10
AI Technical Summary
【0007】 従来、オリビン型リン酸塩化合物の一次粒子は、球形に近似するように合成されている。一次粒子が球形粒子であることにより、充填性の向上、すなわち、エネルギー密度の向上が期待されるためと考えられる。球形粒子は、高い円形度を有する。以下、0.80以上の円形度を有する一次粒子が「球形粒子」とも記される。
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Figure 2026095117000001_ABST
Abstract
Claims
1. Contains primary particles, The primary particles contain an olivine-type phosphate compound, and The primary particles have a circularity of 0.60 or less. Cathode active material.
2. Contains secondary particles, The secondary particles include a first primary particle and a second primary particle. Each of the first primary particles and the second primary particles contains the olivine-type phosphate compound, The first primary particle has a circularity of 0.80 or more, The second primary particle has a circularity of 0.60 or less. The positive electrode active material according to claim 1.
3. The aforementioned secondary particles are 0.05<S B / (S A +S B )<0.30 Satisfying the relationship, The aforementioned S A This indicates the total area of the first primary particles in the cross-section of the secondary particles, and, The aforementioned S B This indicates the total area of the second primary particles in the cross-section of the secondary particle. The positive electrode active material according to claim 2.
4. The first primary particle has an average circularity of 0.87 to 0.
91. The second primary particle has an average circularity of 0.40 to 0.60, The aforementioned secondary particles are 0.14≦S B / (S A +S B )≦0.20 Satisfying the relationship, The positive electrode active material according to claim 3.
5. The olivine-type phosphate compound comprises at least one selected from the group consisting of lithium iron phosphate, lithium manganese phosphate, and lithium manganese iron phosphate. The positive electrode active material according to any one of claims 1 to 4.
6. It includes a positive electrode layer, and The positive electrode layer comprises the positive electrode active material described in any one of claims 1 to 4. electrode.
7. The electrode included in claim 6, battery.
8. Having a bipolar structure, The battery according to claim 7.