Cobalt-free positive electrode material of lithium ion battery, preparation method thereof and lithium ion battery

• Main Authors: XU XINPEI, SHI ZETAO, CHEN SIXIAN, MA JIALI, JIANG WEIJUN, QIAO QIQI
• Format: Patent
• Language: Chinese; English
• Published: 17.07.2020
• Subjects: BASIC ELECTRIC ELEMENTS; CHEMISTRY; COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F; COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM,RUBIDIUM, CAESIUM, OR FRANCIUM; ELECTRICITY; INORGANIC CHEMISTRY; METALLURGY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The invention provides a cobalt-free positive electrode material of a lithium ion battery, a preparation method thereof and the lithium ion battery. The method for preparing the cobalt-free positive electrode material of the lithium ion battery comprises the following steps: mixing lithium nickel manganese oxide with sulfate which is strong acid and weak base salt to obtain a first mixture; and reacting the first mixture at a preset temperature so as to obtain the cobalt-free positive electrode material. Therefore, when the first mixture reacts at a preset high temperature, sulfate can react with residual alkali on the surface of lithium nickel manganese oxide, so that the purpose of reducing the alkali content in the cobalt-free positive electrode material is achieved, and the rate stability, the cycle capacity retention rate and the charge-discharge performance of the lithium ion battery of the cobalt-free positive electrode material are improved; the cobalt-free positive electrode active material is prepar