Method for preparing low-sodium-sulfur ternary positive electrode material precursor

• Main Authors: LI JIACHUANG, SHEN XIAO, SUN XIAOHU, ZHU CUIMEI
• Format: Patent
• Language: Chinese; English
• Published: 18.06.2024
• Subjects: BASIC ELECTRIC ELEMENTS; CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; CHEMISTRY; COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F; ELECTRICITY; INORGANIC CHEMISTRY; METALLURGY; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; SEPARATION; THEIR RELEVANT APPARATUS; TRANSPORTING

The invention discloses a method for preparing a low-sodium-sulfur ternary positive electrode material precursor. The method comprises the following steps: 1, preparing a mixed solution of Ni, Co, Mn and ethanol; preparing a sodium hydroxide or potassium hydroxide solution as a precipitator; preparing an ammonia water solution as a complexing agent; 2, adding pure water, a precipitator and a complexing agent into a reaction kettle to prepare a base solution; 3, stirring of the reaction kettle is kept to be started, nitrogen or inert gas is introduced, and the mixed solution, a precipitant and a complexing agent are added into the kettle for co-precipitation; in the process, the pH is maintained at 12.40-12.80, the ammonia concentration is 0.4-0.7 mol/L, and the temperature is 65-75 DEG C; and 4, carrying out filter pressing, washing and drying on the obtained product to obtain the low-sodium-sulfur ternary positive electrode material precursor. The method can effectively prevent sodium-sulfur impurities from