Lco@oxide@cnt multicomposite cathode material

A LCO@oxide@CNT multicomposite cathode material, wherein the cathode material is a positive electrode material of a positive electrode inside a battery and the positive electrode material is a plurality of positive particles in a positive electrode used in a solid-state battery or semi-solid battery;

• and the oxide is a LLZO (lithium lanthanum zirconium oxide, Li7La3Zr2O12 or a LLZO doped with at least one metal;
• each of the positive particles comprising:
• a composite LCO particle;
• the composite LCO particle including:
• a large LCO (lithium cobalt oxide, LiCoO2) particle which is a cube having an irregular shape;
• and
• a plurality of large LLZO particles and a plurality of small LLZO particles coated on a surface of the large LCO particle;
• each of the large LLZO particles and the small LLZO particles being formed by a LLZO (lithium lanthanum zirconium oxide, Li7La3Zr2O12) or a LLZO doped with at least one metal;
• wherein each of the large LLZO particles forms a first protruded portion on a surface of the large LCO particle;
• a center of the first protruded portion is higher than a flat outer side of the first protruded portion;
• a first LLZO interphase layer is formed between a bottom of each of the large LLZO particles and the large LCO particle;
• the first LLZO interphase layer serves to provide guiding channels for lithium ions and to provide a protection for the large LCO particle;
• wherein each of the small LLZO particles forms a second protruded portion on the surface of the large LCO particle;
• a center of the second protruded portion is higher than a flat outer side of the second protruded portion;
• a second LLZO interphase layer is formed between a bottom of each of the small LLZO particles and the large LCO particle;
• the second LLZO interphase layer serves to provide guiding channels for lithium ions and to provide a protection for the large LCO particle;
• wherein the large LLZO particles and the small LLZO particles have a higher ion guiding capability than that of the large LCO particle and do not easily produce a side reaction with lithium ions;
• when the lithium ions pass through the positive electrode, conducting paths of the lithium ions are dispersed by the guiding of the large LLZO particles and the small LLZO particles distributed on the large LCO particle;
• and
• wherein each of the large LLZO particles and each of the small LLZO particles and the large LCO particle have a crystal structure, which has a good stability and will not be easily released or dissociated, increasing the battery voltage.