Technical Parameters Test items work unit (one's workplace) Control technology standards solidification density g/ml ≥0.70 specific surface area m²/g 10.0±4.0 First discharge capacity mAh/g ≥155.0 particle size distribution μm D50 1.50±0.60 Impurity metal ion content ppm Al ≤300 (fig.) overstatement ppm ≤1000 Magnetic content ppm ≤1.0