3158 results about "Multi element" patented technology

The invention discloses a multi-element composite positive electrode material of a Li-ion secondary battery and the preparation method thereof. The multi-element composite positive electrode material with a spherical shape, narrow particle size distribution, consistency equal to or less than 0.3 and tap density equal to or larger than 2.2 g/cm is represented by a chemical formula LiNixCoyMnzO2, where x is not less than 0.5 and not larger than 1, y is not less than 0 and not larger than 0.2, z is not less than 0 and not larger than 0.3, and the summation of x, y and z is equal to 1. The preparation method comprises the following steps: controlling the crystallization and precipitation of Ni, Co and Mn salt solution to obtain Ni-Mn-Co precipitate with narrow particle size distribution and satisfactory consistency and tap density; washing and drying to obtain a precursor; mixing the precursor with a Li compound in deionized water, and drying to obtain a mixed material; sintering the dried material, crushing and classifying to obtain a primary material; and sintering the primary material, screening and classifying to obtain the final product. The method can improve the specific capacity of the material and control the profile and the particle size of the material, thereby improving the material stability.