High-sphericity-degree positive electrode material precursor as well as preparation method and application thereof

• Main Authors: YUE XIANJIN, XU KAIHUA, LI CONG, HUA WENCHAO, ZHANG KUN
• Format: Patent
• Language: Chinese; English
• Published: 25.07.2023
• Subjects: BASIC ELECTRIC ELEMENTS; CHEMISTRY; COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F; ELECTRICITY; INORGANIC CHEMISTRY; METALLURGY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The invention relates to a high-sphericity-degree positive electrode material precursor and a preparation method and application thereof, and the preparation method comprises the following steps: mixing a nickel-cobalt-manganese ternary mixed salt solution, a precipitator solution, a complexing agent solution and a base solution under an oxygen-containing atmosphere condition for a co-precipitation reaction to obtain the high-sphericity-degree positive electrode material precursor, the oxygen-containing atmosphere is formed using an oxygen-containing gas, and the volume fraction of oxygen in the oxygen-containing gas is 1 vol% to 20 vol%. The precursor is prepared in the oxygen-containing atmosphere, so that the precursor has high sphericity and high tap density, and the positive electrode material prepared from the precursor has good cycling stability and rate capability. 本发明涉及一种高球形度正极材料前驱体及其制备方法与应用，所述制备方法包括如下步骤：在含氧气氛条件下，混合镍钴锰三元混合盐溶液、沉淀剂溶液、络合剂溶液以及底液以进行共沉淀反应，得到所述高球形度正极材料前驱体；所述含氧气氛使用含氧气体形成，含氧气体中氧气的体积分数为1vol％至2