The Preparation And Coating Of Lithium-ion Battery Cathode Material LiNi_0.8Co_0.1Mn_0.1O₂

With the growing shortage of global energy and resources, the development of new energy material has become the focus of worldwide attention. Lithium ion batteries have drawn great attention due to its high voltage, high energy density, long cycle life, low self-discharge and so on. In this paper, the development of cathode material of lithium ion batteries was reviewed in detail. The synthesis of LiNio.8Coo.1Mn0.1O2through co-precipitation and the coated of LiNi0.8Co0.1Mno.102were deeply investigated, and the morphology, structure and electrochemical were showed by using XRD, SEM, AC impedance and cycle voltammetry and so on.The synthesis of submicron precursor Nio.8Co0.1Mn0.i(OH)2and granular spherical precursor through co-precipitation were investigated. The result show that the stirring intensity has little effect on the performance of the materials. When the rate of feeding was0.125ml/min, we could get flaky sub-micron precursor Nio.8Co0.1Mn0.i(OH)2. During the process of the preparation of granular spherical precursor, the precursor partical size will increase and we could get the granular spherical precursor by increasing the amount of the reactant, but the ammonia concentration and mixing intensity have little effect on the performance of the materials. The tap density test show that the commercialization of spherical precursor has the highest tap density.We take the precursors of carious morphologues prepared in the experiment as raw material to study the preparation and performance of LiNio.8Coo.1Mno.1O2. The result show that, in the roasting precess, the calcination temperature of the high temperature segment should be at least750℃and the roasting time should be at least15h. The cathode material prepared by the precursor that was prepared at the feeding rate of0.125ml/min have better performance compared to granular spherical cathode materials and the commercialization of spherical cathode materials, especially the high rate performance, electrochemical test showed that its initial capacity is199.7mAh/g at the rate of0.5C,205.2mAh/g at1C, and189.4mAh/g at2C, after50cycles the capacity retention rate is88.68%、92.35%�'�92.29%, respectively.The LATP coating of LiNio.8Coo.1Mno.1O2was done, the result shows that the cathode material in the coating process is subject to corrosion, and the electrochemical performance of the coated was worse. The TiO2coating of LiNio.8Coo.1Mno.1O2was done by a new easy method. The SEM, TEM and EDS test showed that through this new way, we could get the TiO2coating done indeed. Electrochemical test showed that the cycle performances improved by coating.