The present invention relates to ferrite particles for bonded magnet, having a volume-average particle diameter of 2.1 to 2.7 m and a particle diameter 90 of 4.3 to 5.4 m wherein the 90 represents a particle diameter at which a cumulative percentage of particles under sieve (undersize particles) based on a volume thereof is 90%, when determined from a particle size distribution thereof measured by using a laser diffraction type particle size distribution measuring apparatus.

The present invention relates to ferrite particles for bonded magnet, having a volume-average particle diameter of 2.1 to 2.7 m and a particle diameter 90 of 4.3 to 5.4 m wherein the 90 represents a particle diameter at which a cumulative percentage of particles under sieve (undersize particles) based on a volume thereof is 90%, when determined from a particle size distribution thereof measured by using a laser diffraction type particle size distribution measuring apparatus.

The present application discloses a cathode lithium-supplementing additive, and a preparation method therefor and an application thereof. The cathode lithium-supplementing additive of the present application is of a core-shell structure, a core of the core-shell structure comprises a cathode lithium-supplementing material, and a coating layer covering the core comprises a piperidine group-containing polymer. The polymer used in the cathode lithium-supplementing additive of the present application imparts the effect of inhibiting active oxygen and the effect of capturing a free radical generated during charging and discharging of a lithium ion battery to the coating layer, such that the amount of gas generated in the charging and discharging process of the lithium ion battery is obviously reduced, and the volume expansion of the lithium ion battery is reduced.

The present application discloses a cathode lithium-supplementing additive, and a preparation method therefor and an application thereof. The cathode lithium-supplementing additive of the present application is of a core-shell structure, a core of the core-shell structure comprises a cathode lithium-supplementing material, and a coating layer covering the core comprises a piperidine group-containing polymer. The polymer used in the cathode lithium-supplementing additive of the present application imparts the effect of inhibiting active oxygen and the effect of capturing a free radical generated during charging and discharging of a lithium ion battery to the coating layer, such that the amount of gas generated in the charging and discharging process of the lithium ion battery is obviously reduced, and the volume expansion of the lithium ion battery is reduced.

An organically surface-bonded metal or metal oxide material including an inorganic metal or metal oxide and an organic material. The organic material is coated on the surface of the inorganic metal or metal oxide. The inorganic metal or metal oxide and the organic material are linked through a strong chemical bond. The strong chemical bond includes a covalent bond between a metal in the inorganic metal or metal oxide and a nitrogen in the organic material.

An organically surface-bonded metal or metal oxide material including an inorganic metal or metal oxide and an organic material. The organic material is coated on the surface of the inorganic metal or metal oxide. The inorganic metal or metal oxide and the organic material are linked through a strong chemical bond. The strong chemical bond includes a covalent bond between a metal in the inorganic metal or metal oxide and a nitrogen in the organic material.