Test item

Unit

Test result

Test method/equipment

Exterior

/

Gray-black powder with uniform color,

Visual

Particle size distribution

um

D10:0.404

Laser diffraction method;

Particle refractive index 1.74; Particle absorption rate 1; Dispersant: water;

Refractive index of dispersant: 1.33; Malvin Mastersizer 2000

D50:1.687

D90:10.351

Specific Surface Area

m²/g

20.72

BET comparison method;

Specific surface area meter F-Sorb2400

Moisture

ppm

856

Karl Fischer Coulomb method; AKF-3N

Tap density

g/cm³

0.57

9000 times of vibration, vibration densitometer

Carbon c

%

1.93

Carbon and sulfur analyzer; NJD-80

PH

6.80

10% suspension;

Leici PHS-2F

Sodium (Na)

%

17.56

ICPOES test

Vanadium (V)

%

20.21

Phosphorus (P)

%

20.02

0.2C first discharge capacity

mAh/g

111.6

Electrochemical test system;

Voltage range: 2.5-4.3V;

CC/CV

0.2C first discharge efficiency

%

96.24