| abstract |
The invention belongs to the field of lithium ion battery materials, and particularly relates to a cobalt carbonate composite precursor with a core-shell structure, a preparation method of a sintered lithium cobaltate coating and application of the sintered lithium cobaltate coating. The method is realized by the following steps: 1) solution preparation and synthesis; 2) primary sintering; 3) secondary sintering; 4) ball milling; 5) and sintering for the third time to obtain the lithium cobaltate with the coated CNTs and the core-shell structure. The preparation method has the advantages that firstly, in the ball milling process of the CNTs and the Al-doped lithium cobaltate of the shell, CNTs/Al composite powder is added to be beneficial to heat dissipation of the battery during charging and discharging, the polarization of the battery is reduced, the high and low temperature performance of the battery is improved, and the service life of the battery is prolonged; secondly, a large amount of aluminum segregation can be avoided in the core-shell preparation process, and during the subsequent coated secondary calcination of the CNTs, aluminum carbide with super-strong affinity with lithium ions is easily formed, and the CNTs adsorption force enables the CNTs cavity to be reduced into metallic lithium. |