Test item   

Unit

Index

Typical value

Test instrument or method

Exterior

/

Black Powder

/

Visual inspection

Tap density

g/cm3

≥1.20

1.34

Refer to GB/T5162-2006

Specific surfac area

m²/g

0.3-1.0

0.68

Surface area meter

H2O

ppm

≤500

432

Moisture meter

D10

μm

≥2.00

3.45

Laser particle size analyzer

D50

μm

8.00±2.00

7.64

D90

μm

≤24.00

17.03

Na

Wt%

20.50~21.00

20.72

AAS

Ni+Fe+Mn

Wt%

50.50±1.00

50.63

GB/T 223.25-1994,gravimetric method

PH

/

≤13.00

12.82

pH meter

Gram capacity

mAh/g

≥120.0

127

Coin half battery, 4.0~2.0v, 0.1c charge and discharge

Gram capacity

mAh/g

≥113.0

116.7

Cylindrical battery 18650, 4.0~2.0v, 0.2c charge and discharge

Gram capacity

mAh/g

≥145.0

147.0

Coin half battery, 4.1~2.0v, 0.1c charge and discharge

Gram capacity

mAh/g

≥123.0

125.9

Cylindrical battery 18650, 4.1~2.0v, 0.2c charge and discharge