Energy storage element and energy storage device
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- GS YUASA CORP
- Filing Date
- 2022-03-31
- Publication Date
- 2026-06-09
AI Technical Summary
【0009】 本発明の一側面によれば、充放電サイクル後の容量維持率が高い蓄電素子及び蓄電装置を提供することができる。
Smart Images
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Abstract
Claims
1. The electrode body comprises a positive electrode, a negative electrode, and a separator disposed between the positive electrode and the negative electrode. The above positive electrode has a positive electrode active material layer containing a positive electrode active material having an average primary particle diameter of 1.0 μm or more. The above positive electrode active material is a lithium transition metal composite oxide having an α-NaFeO2 type crystal structure. The electrode body is subjected to a load of 0.1 MPa or more and 1 MPa or less in the stacking direction. An energy storage element in which the creep strain of the above separator after maintaining a load of 2 MPa at a temperature of 65°C for 24 hours is 11% or more and 28% or less.
2. The energy storage element according to claim 1, wherein the positive electrode active material is a secondary particle having a ratio of 5 or less of the average secondary particle diameter to the average primary particle diameter, or a primary particle that is substantially not aggregated.
3. The above separator has an inorganic particle layer, The energy storage element according to claim 1 or claim 2, wherein the positive electrode active material layer and the inorganic particle layer are arranged facing each other.
4. The energy storage element according to claim 1, claim 2, or claim 3, wherein the average primary particle diameter of the positive electrode active material is 6.0 μm or less.
5. A power storage device comprising a power storage element according to any one of claims 1 to 4 and a pressurizing member.