Details
Materials need to be stored in vacuum seal
The electrolyte used during the test is: sodium electrolyte (KLD-NF35)
Baking conditions for pole sheets: 110℃ 10h 10Pa (Crystal water is difficult to bake. If the vacuum level of 10Pa cannot reach 10Pa, the temperature needs to be increased to 170℃ and the baking time is > 5 days)
Sodium ion positive electrode material, Prussian
Crystal structure: no impurity peaks
Micro-morphology: cubic
| Serial number | Test items | unit | Specification | Test results | Inspection method or instrument | ||
| 1 | Chemical composition | Na | (wt%) | 17.0±2.0 | 17.36 | ICP | |
| 2 | Fe | (wt%) | 22.0±0.5 | 22.14 | |||
| 3 | Mn | (wt%) | 22.0±0.5 | 22.36 | |||
| 4 | Na2CO3 | (wt%) | ≤1.000 | N.D. | Titration method | ||
| 5 | NaOH | (wt%) | ≤1.000 | N.D. | |||
| 6 | Physical characteristics | Particle size distribution | D10 | (μm) | ≥1.0 | 1.876 | Laser particle size analyzer |
| 7 | D50 | (μm) | 3.0~5.0 | 3.526 | |||
| 8 | D90 | (μm) | ≤7.0 | 5.924 | |||
| 9 | AD | （g/cm3） | ≥0.2 | 0.40 | Fully automatic specific surface and porosity analyzer | ||
| 10 | TD | （g/cm3） | ≤1.0 | 0.91 | Tapping density measuring instrument | ||
| 11 | pH | / | ≤9.0 | 8.23 | pH meter | ||
| 12 | Moisture | (wt%) | Crystal water | 101830 | Moisture measuring instrument | ||
| 13 | Electrochemical properties | First discharge capacity | (mAh/g) | ≥145.0 | 158.4 | CR2032 0.1/0.1C(4.0-2.0V) |
|
| 14 | First time efficiency | (%) | ≥93.0 | 95.7 | |||
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