Positive pole piece and lithium ion battery

• Main Authors: HAO RONG, CHEN SANZHI, DU MENGYI, LIU JIAMIN
• Format: Patent
• Language: Chinese; English
• Published: 25.08.2023
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The invention provides a positive pole piece which comprises a positive current collector and a positive active material layer arranged on at least one side surface of the positive current collector, and a positive active material contained in the positive active material layer comprises a first lithium iron phosphate material and a second lithium iron phosphate material; the particle size of the first lithium iron phosphate material is D1v50 [mu] m when the volume cumulative distribution percentage of the first lithium iron phosphate material reaches 50%, the particle size of the second lithium iron phosphate material is D2v50 [mu] m when the volume cumulative distribution percentage of the second lithium iron phosphate material reaches 50%, the D1v50 is in a range of 0.3-0.95, and the D2v50 is in a range of 1.0-3.5; when the volume density of the positive electrode active material reaches the maximum, the particle size is Dmomu m, the compaction density of the positive electrode plate under the pressure of