Positive electrode plate, secondary battery, battery module, battery pack, and power consuming device
A positive electrode plate, a secondary battery comprising the positive electrode plate, as well as a battery module, a battery pack, and a power consuming device are provided. The positive electrode plate of the present invention comprises: a positive current collector and a positive film layer comprising a first positive film layer and a second positive film layer, wherein the first positive film layer is disposed on at least one surface of the positive current collector and comprises a first positive active material comprising a hollow particle material, and the second positive film layer is disposed on the first positive film layer and comprises a second positive active material comprising a solid particle material.
1 . A positive electrode plate, comprising
a positive current collector and a positive film layer comprising a first positive film layer and a second positive film layer, wherein,
the first positive film layer is disposed on at least one surface of the positive current collector and comprises a first positive active material comprising a hollow particle material, the hollow particle materials comprising a plurality of hollow particles; and
the second positive film layer is disposed on the first positive film layer and comprises a second positive active material comprising a solid particle material, the solid particle material comprising a plurality of solid particles, each solid particle having a solid core,
the first positive film layer has a thickness of 100-200 μm,
the second positive film layer has a thickness of 100-200 μm.
2 . The positive electrode plate according to claim 1 , wherein
in the first positive active material, a number of the hollow particles accounts for 70% or more of a number of all particles of the first positive active material.
3 . The positive electrode plate according to claim 1 , wherein
the hollow particles each have a volume median particle size of 1-15 μm; and/or
the solid particles each have a volume median particle size of 1-15 μm.
4 . The positive electrode plate according to claim 3 , wherein the hollow particles each have a volume median particle size of 3-9 μm.
5 . The positive electrode plate according to claim 3 , wherein the solid particles each have a volume median particle size of 3-9 μm.
6 . The positive electrode plate according to claim 1 , wherein,
a ratio of the volume median particle size of the hollow particle to the volume median particle size of the solid particle is between 0.5-2.
7 . The positive electrode plate according to claim 1 , wherein,
a ratio of a hollow diameter of the hollow particle to the volume median particle size of the hollow particle is between 0.1-0.5.
8 . The positive electrode plate according to claim 1 , wherein,
the hollow particle material has a BET of 1-3 m 2 /g and the solid particle material has a BET of 0.1-1 m 2 /g.
9 . The positive electrode plate according to claim 1 , wherein,
a weight ratio of the first positive film layer to the second positive film layer is between 1:9-9:1.
10 . The positive electrode plate according to claim 1 , wherein,
a thickness ratio of the first positive film layer to the second positive film layer is between 0.5-2.
11 . A secondary battery, wherein
the secondary battery comprises the positive electrode plate according to claim 1 .
12 . A battery module, wherein
the battery module comprises the secondary battery according to claim 11 .
13 . A battery pack, wherein
the battery pack comprises the battery module according to claim 12 .
14 . A power consuming device, wherein
the power consuming device comprises the secondary battery according to claim 11 .
15 . The positive electrode plate according to claim 1 , wherein,
a hollow diameter of the hollow particles is 0.06 to 0.6 μm.
16 . The positive electrode plate according to claim 1 , wherein,
a weight ratio of the first positive film layer to the second positive film layer is between 1:2-2:1.
17 . The positive electrode plate according to claim 1 , wherein,
a weight ratio of the first positive film layer to the second positive film layer is 1.
18 . The positive electrode plate according to claim 1 , wherein,
a thickness ratio of the first positive film layer to the second positive film layer is 1.
19 . The positive electrode plate according to claim 1 , wherein,
the hollow particle material and the solid particle material are each composed of one selected from a lithium-containing phosphate having an olivine structure and a lithium transition metal oxide.