-- - A NICKEL-COBALT-MANGANESE MULTI-ELEMENT LITHIUM ION BATTERY CATHODE MATERIAL WITH DOPANTS AND ITS METHODS OF PREPARATION

摘要

The present invention describes a cathode material for lithium ion batteries doped with Ni, Co-, and Mn-multi-elements with high compact densities and methods of making the same. The method for preparing the cathode material is as follows: (A) preparing an intermediate compound doped with Ni, Co-, and Mn-multi-elements by coprecipitation or chemical synthesis; (B) mixing the multi-doped intermediate compound with a lithium salt to prepare a mixture; (C) pre-treating the resultant mixture, then adding polyvinyl alcohol and uniformly mixing it; (D) pressurizing the resultant mixture into lumps, calcining at 800 to 950 占 폚, cooling outside, pulverizing, and passing through a 400 mesh sieve; And (E) calcining the resulting powder again at 700-800 占 폚, cooling it outside, grinding and sieving to obtain a product. The positive electrode material obtained by using a method described above has the general formula of _{LiNi x Co y Mn z M (} 1-xyz) O 2, in the range 0.6~30㎛ particle size, density of the compact 3.5~3.7g / ㎝ ³ , And can provide an initial discharge capacity of 150 to 165 mAh / g with excellent cycling and safety performance.