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AssigneeContemporary Amperex Technology Co., Limited
InventorsRui DU, Yongchao LIU, Deyu ZHAO, Sihui WANG, Chongheng SHEN, Na LIU
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This application relates to the field of battery technologies, and in particular, to a pressure-resistant positive active material and an electrochemical energy storage apparatus. The positive active material includes secondary particles composed of primary particles, and a quantity σ of primary particles per unit sphere area in a SEM graph of the secondary particles is 5/μm2 to 30/μm2. A single-particle pressure-resistant strength of the secondary particles is 60 MPa to 300 MPa. A molecular formula of the positive active material is LixNiyCozMkMepOrAm, where 0.95≤x≤1.05, 0≤y≤1, ≤z≤1, 0≤k≤1, 0≤p≤0.1, 1≤r≤2, 0≤m≤2, and m+r≤2. The positive active material in this application has a compact particle structure and a high single-particle pressure-resistant strength.
A positive active material, wherein the positive active material comprises secondary particles composed of primary particles, a quantity σ of primary particles per unit sphere surface area in a SEM profile of the secondary particles is 5/μm2 to 30/μm2, and a single-particle pressure-resistant strength of the secondary particles is 60 MPa to 300 MPa;
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