METHOD FOR COMPREHENSIVE UTILIZATION OF MOTHER LIQUOR IN SYNTHESIS PROCESS OF TERNARY POSITIVE ELECTRODE MATERIAL PRECURSOR OF LITHIUM ION BATTERY

• Main Authors: WU, Lijue, CHEN, Jianbing, TANG, Yiwei, HUANG, Yaxiang, ZHENG, Shilin, WEN, Dingqiang
• Format: Patent
• Language: Chinese; English; French
• Published: 03.10.2019
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

A method for comprehensive utilization of a mother liquor in a synthesis process of a ternary positive electrode material precursor of a lithium ion battery, comprising steps of: introducing, from top to bottom, a ternary precursor mother liquor into a rectification tower of a stripper deamination system to perform deamination, deamination residence time of a unit volume of the mother liquor being controlled to be 0.5-1.0 h; after the deamination of step one, adding a specific amount of ternary precursor waste, and introducing ozone at a specific rate, to carry out a reaction for 0.5-2 hours while heating and stirring; filtering the ternary precursor liquor obtained after completion of the reaction in step two to obtain a filtrate and a filter residue; and putting the filter residue obtained in step three into another reaction tank, adding water and mixing to obtain a slurry, adding a specific amount of sulfuric acid and a reducing agent, and leaching by heating and agitation for 2-6 hours. The method for com