US 12,107,257 B1
Positive electrode plate, lithium ion battery, and energy storage device
Lingxia Li, Guangdong (CN)
Assigned to SHENZHEN HITHIUM ENERGY STORAGE TECHNOLOGY CO., LTD, Guangdong (CN); and XIAMEN HITHIUM ENERGY STORAGE TECHNOLOGY CO., LTD., Fujian (CN)
Filed by SHENZHEN HITHIUM ENERGY STORAGE TECHNOLOGY CO., LTD, Guangdong (CN); and XIAMEN HITHIUM ENERGY STORAGE TECHNOLOGY CO., LTD., Fujian (CN)
Filed on Mar. 29, 2024, as Appl. No. 18/621,154.
Claims priority of application No. 202310718022.0 (CN), filed on Jun. 16, 2023.
Int. Cl. H01M 4/136 (2010.01); H01M 4/36 (2006.01); H01M 4/58 (2010.01); H01M 10/0525 (2010.01); H01M 4/02 (2006.01)
CPC H01M 4/136 (2013.01) [H01M 4/366 (2013.01); H01M 4/5825 (2013.01); H01M 10/0525 (2013.01); H01M 2004/021 (2013.01); H01M 2004/028 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A positive electrode plate, comprising:
a positive current collector; and
a positive active substance layer comprising a first positive active substance layer and a second positive active substance layer, the first positive active substance layer being disposed on at least part of a surface of the positive current collector, the second positive active substance layer being disposed on at least part of a surface of the first positive active substance layer away from the positive current collector, the positive active substance layer containing a positive active substance doped with a metal element Ti, the metal element Ti being configured to enhance deintercalation ability of the positive electrode active substance for lithium ions, wherein:
a ratio of a doping amount of the metal element Ti in the positive active substance of the first positive active substance layer to the doping amount of the metal element Ti in the positive active substance of the second positive active substance layer ranges from 3 to 5;
the doping amount of the metal element Ti in the positive active substance of the first positive active substance layer ranges from 2500 ppm to 6500 ppm;
the doping amount of the metal element Ti in the positive active substance of the second positive active substance layer ranges from 750 ppm to 1500 ppm; and
the positive active substance in the first positive active substance layer and the positive active substance in the second positive active substance layer are lithium iron phosphate.
 
5. A lithium ion battery, comprising a positive electrode plate, the positive electrode plate comprising:
a positive current collector; and
a positive active substance layer comprising a first positive active substance layer and a second positive active substance layer, the first positive active substance layer being disposed on at least part of a surface of the positive current collector, the second positive active substance layer being disposed on at least part of a surface of the first positive active substance layer away from the positive current collector, the positive active substance layer containing a positive active substance doped with a metal element Ti, the metal element Ti being configured to enhance deintercalation ability of the positive electrode active substance for lithium ions, wherein:
a ratio of a doping amount of the metal element Ti in the positive active substance of the first positive active substance layer to the doping amount of the metal element Ti in the positive active substance of the second positive active substance layer ranges from 3 to 5;
the doping amount of the metal element Ti in the positive active substance of the first positive active substance layer ranges from 2500 ppm to 6500 ppm;
the doping amount of the metal element Ti in the positive active substance of the second positive active substance layer ranges from 750 ppm to 1500 ppm; and
the positive active substance in the first positive active substance layer and the positive active substance in the second positive active substance layer are lithium iron phosphate.