Method for manufacturing oxide particles coated with amino groups

A method for manufacturing oxide particles coated with amino groups, wherein the oxide particles are a plurality of composite LLZO particles;

• the method comprising the steps of:
• step A:
• placing a plurality of first LLZO particles and a methanol into a wet mixer for mixing and grinding at a first rotation speed to form a first mixed slurry;
• wherein the wet mixer has a plurality of zirconium balls for mixing and grinding to cause that the size of each of the first LLZO particles is smaller than 500 nm;
• step B:
• placing a tris (tris(hydroxymethyl)aminomethane, (HOCH2)3CNH2) material and a tris(hydroxymethyl)aminomethane hydrochloride (NH2C(CH2OH)3·HCl) into the wet mixer for grinding and stirring with the first mixed slurry to form a second mixed slurry and to cause that an outer surface of each of the first LLZO particles is coated with a hydroxide ion layer;
• wherein the hydroxide ion layer has a plurality of third OH− ions;
• each of tris molecules in the tris material and the tris(hydroxymethyl)aminomethane hydrochloride has three OH− ions which are a first OH− ion, a second OH− ion and the third OH− ion;
• the first OH− ions and the second OH− ions of the tris molecules are bound to oxidizing functional groups on a corresponding first LLZO particle;
• and the third OH− ions of the tris molecules extend outward to an outer side of the corresponding first LLZO particle to form the hydroxide ion layer on the corresponding first LLZO particle;
• wherein in the step B, after the tris material and the tris(hydroxymethyl)aminomethane hydrochloride are placed into the wet mixer, a rotation speed of the wet mixer is increased from the first rotation speed to a second rotation speed for grinding and stirring;
• step C:
• placing a dopamine hydrochloride ((HO)2C6H3CH2CH2NH2·HCl) into the wet mixer for mixing and grinding with the second mixed slurry to form a third mixed slurry which includes the composite LLZO particles;
• wherein the dopamine hydrochloride has a plurality of dopamine molecules;
• a polymerization triggered by dehydration is performed between OH− ions of the dopamine molecules and the third OH− ions of the hydroxide ion layer on a corresponding first LLZO particle, which causes that each of the first LLZO particles is bound to a plurality of corresponding dopamine molecules;
• the corresponding dopamine molecules are co-polymerized to form a dopamine layer coated on an outer surface of the hydroxide ion layer on the corresponding first LLZO particle;
• and each of the composite LLZO particles is formed by a corresponding first LLZO particle, a corresponding hydroxide ion layer and a corresponding dopamine layer;
• and
• wherein in the step C, the rotation speed of the wet mixer is decreased from the second rotation speed to a third rotation speed.