Tungsten-doped lithium manganese iron phosphate-based particulate, tungsten-doped lithium manganese iron phosphate-based powdery material including the same, and method for preparing powdery material

1. A tungsten-doped lithium manganese iron phosphate-based particulate for a cathode of a lithium-ion battery, comprising a composition represented by Formula (1):

Li x Mn 1-y-z-f Fe y M z W f P a O 4a±p /C  (1)

wherein

M is Mg;

0.9≤x≤1.2;

0.1≤y≤0.4;

0≤z≤0.08;

f=0.002;

0.1<y+z+f<0.5;

0.85≤a≤1.15;

0<p<0.1; and

C is in an amount of larger than 0 wt % and up to 3.0 wt % based on a total weight of the composition represented by Formula (1).

2. A tungsten-doped lithium manganese iron phosphate-based powdery material for a cathode of a lithium-ion battery, comprising the tungsten-doped lithium manganese iron phosphate-based particulate according to claim 1 .

3. The tungsten-doped lithium manganese iron phosphate-based powdery material according to claim 2 , having a specific surface area ranging from 0.5 m 2 /g to 20 m 2 /g.

4. A method for preparing the tungsten-doped lithium manganese iron phosphate-based powdery material according to claim 2 , comprising the steps of:

a) preparing a blend which includes a lithium source, a manganese source, a tungsten source, an iron source, a phosphorous source, and a magnesium source;

b) adding a carbon source to the blend to form a mixture and subjecting the mixture to milling and granulating to form a granulated mixture; and

c) subjecting the granulated mixture to a sintering treatment to form the tungsten-doped lithium manganese iron phosphate-based powdery material.

5. The method according to claim 4 , wherein in step a), the tungsten source is tungsten trioxide.

6. The method according to claim 4 , wherein in step c), the sintering treatment is implemented at a temperature ranging from 500° C. to 950° C.