High nickel electrode sheet with reduced moisture reactivity and method of making same
A technology of electrode sheet and positive electrode mixture, applied in the field of high-nickel electrode sheet with reduced moisture reactivity and its manufacturing, can solve the problems of insufficient battery life and difficulty in achieving energy density, and achieve improved life characteristics and increased capacity The effect of the characteristic
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
no. 1 approach
[0065] In the electrode sheet according to the first embodiment of the present invention, the second positive electrode mixture layer includes the first positive electrode active material and the second positive electrode active material, and the first positive electrode mixture layer can be made of the same average particle diameter D 50 positive electrode active material.
[0066] At this time, the average particle diameter D of the positive electrode active material of the first positive electrode mixture layer 50 It may be 9 to 30 μm, preferably 9 to 25 μm, more preferably 10 to 20 μm. In addition, it may be the same as the average particle diameter of the first positive electrode active material of the second positive electrode mixture layer.
no. 2 approach
[0068] In the electrode sheet according to the second embodiment of the present invention, the second positive electrode mixture layer may include the first positive electrode active material and the second positive electrode active material, and the first positive electrode mixture layer may include large particles like the second positive electrode mixture layer. A mixture of a first positive electrode active material with a small particle size and a second positive electrode active material with a small particle size.
[0069] At this time, in order to make the second positive electrode mixture layer stronger than the first positive electrode mixture layer in roll pressing, the weight (b) of the second positive electrode active material in the second positive electrode mixture layer is equal to the weight of the first positive electrode active material. The ratio (b / a) of the weight (a) is greater than the ratio (b' / a') of the weight (b') of the second positive electrode act...
Embodiment 1
[0102] (Preparation of the first positive electrode slurry for forming the first positive electrode mixture layer)
[0103] Prepare the first positive electrode active material (D 50 11 μm) as lithium-nickel-cobalt-manganese transition metal oxide, which is then mixed with carbon black conductive material and PVDF binder at a weight ratio of 96.5:1.5:2 in N-methylpyrrolidone solvent to manufacture The first positive electrode slurry (viscosity: 7000 Pa·s).
[0104] (Preparation of the second positive electrode slurry for forming the second positive electrode mixture layer)
[0105] The first positive electrode active material (D 50 is 11 μm) and the second positive electrode active material (D 50 6 μm) in a ratio of 8:2 to prepare a positive electrode active material, which is mixed with carbon black conductive material and PVDF binder in a ratio of 96.5:1.5:2 in N-methylpyrrolidone solvent to form The second positive electrode slurry (viscosity: 7000 Pa·s).
[0106] (Pre...
PUM
| Property | Measurement | Unit |
|---|---|---|
| particle size | aaaaa | aaaaa |
| particle size | aaaaa | aaaaa |
| strength | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
Login to View More