Method for reducing sulfur content of nickel cobalt aluminum precursor

• Main Authors: QIU TIAN, SHEN ZHENLEI, CUI YUTING, WANG JUAN, CAI ZENGFU, ZHU YUHUA, ZHAO BINJIE, GAO JIONGXIN
• Format: Patent
• Language: Chinese; English
• Published: 12.12.2017
• Subjects: CHEMISTRY; COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F; INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OFSOLID INORGANIC COMPOUNDS; INORGANIC CHEMISTRY; METALLURGY

The invention discloses a method for reducing the sulfur content of a nickel cobalt aluminum precursor. Sulfate radicals adsorbed at the surface of the nickel cobalt aluminum precursor can be removed by traditional alkali liquid such as sodium hydroxide and lithium hydrate, but the removal effect on the sulfate radicals in the nickel cobalt aluminum precursor crystalline structure is poor; the requirement of a power battery positive electrode material on the impurity sulfur content is different to meet. The method is characterized in that a nickel cobalt aluminum mixed metal solution, sodium hydroxide and ammonium hydroxide are added into a reaction kettle at the same time; the nickel cobalt aluminum precursor is obtained through controlling the reaction conditions; after the mother liquid removal, the nickel cobalt aluminum precursor is transferred into a washing kettle to be subjected to sizing washing and water washing; then, drying and sieving are performed to obtain the nickel cobalt aluminum precursor w