Positive electrode material composition, method for the preparation thereof, positive electrode plate, secondary battery and electrical device containing the same

A method for preparing a positive electrode material composition, comprising

• a step of providing an core material, said core comprises Li1+xMn1-yAyP1-zRzO4, wherein x is in a range of −0.100 to 0.100, y is in the range of 0.001 to 0.500, and z is in the range of 0.001 to 0.100, said A comprising one or more elements selected from Zn, Al, Na, K, Mg, Mo, W, Ti, V, Zr, Fe, Ni, Co, Ga, Sn, Sb, Nb, and Ge;
• a step of cladding, comprising providing an MP2O7 powder and an XPO4 suspension comprising a carbon source, adding said core material, and MP2O7 powder to the XPO4 suspension comprising a carbon source and mixing them followed by sintering, thereby obtaining a positive electrode active material, wherein said M and X each are independently one or more elements selected from Li, Fe, Ni, Mg, Co, Cu, Zn, Ti, Ag, Zr, Nb and Al, and the resulting positive electrode active material has a core-shell structure comprising said core and a shell covering said core, said shell comprises a first cladding layer covering said core and a second cladding layer covering said first cladding layer, said first cladding layer comprises pyrophosphate salts MP2O7 and phosphate salts XPO4, and said second cladding layer comprises carbon;
• and
• a step of mixing, comprising mixing the resulting positive electrode active material with an organopolysiloxane compound.