| abstract |
Disclosed are a positive electrode material for a high voltage lithium battery, a battery, a preparation method therefor and the use thereof. The structural formula of the positive electrode material is Li[LixMnaNibCoc]O2·αMyOz, wherein -0.05 < x < 0.3, a, b and c are all greater than 0.02 and less than 0.9, M is a metal element other than lithium, nickel, cobalt and manganese, and MyOz is a composite oxide complying with valence composition, 0.13 ≤ α ≤ 0.3, 0 < y ≤ 3, 0 < z ≤ 5, and 0.9 < x+a+b+c < 1.4. The positive electrode material is obtained by using a precursor synthesis process and a doping and coating technique and by crushing twice, demagnetizating twice and sintering twice. A lithium ion secondary battery prepared using the positive electrode material has the advantages of a stable structure, a good electrolyte applicability, etc. Lithium ion secondary batteries prepared using different negative electrodes have a good cycle stability in a maximum operating voltage range of 2.8-4.8 V, and are applicable in the fields of long-lasting lithium battery applications such as electric vehicles (xEV) and energy storage systems (ESS). |