Method for preparing ternary cathode material precursor by recycling lithium-ion battery material

Abstract

The invention relates to a method for preparing a ternary cathode material precursor by recycling a lithium-ion battery material. The method comprises the following steps: recycling a lithium-ion battery cathode material with sulfuric acid and hydrogen peroxide to obtain a first solution; adjusting the pH value of the first solution to be 5-6.5, adding a filter aid and filtering out impurities to obtain a second solution; adding nickel sulfate, cobalt sulfate and/or manganese sulfate to the second solution, adjusting the molar ratio of nickel to cobalt to manganese to be (0.4-0.6) to (0.1-0.3) to (0.2-0.4) to obtain a third solution; adding a complex precipitant to the third solution, adjusting the pH value of the third solution to be 7-9, and reacting to obtain a nickel-cobalt-manganese ternary material precursor sediment; and washing and drying the nickel-cobalt-manganese ternary material precursor sediment to obtain the ternary cathode material precursor. The method is high in recovery rate; the recycling process is simple; and the prepared ternary cathode material precursor is high in purity, small in particle size, narrow in distribution and even to mix.

Description

technical field [0001] The invention relates to the technical field of battery materials, and more specifically, relates to a method for preparing a precursor of a ternary cathode material by using recovered lithium-ion battery materials. Background technique [0002] In recent years, lithium-ion batteries have been widely used in mobile phones and tablet computers due to their advantages such as large specific energy, high output voltage, high current charge and discharge, no memory effect, long cycle life, low self-discharge rate, and environmental protection. And other electronic digital products, and gradually become the preferred power source for energy storage devices, electric vehicles and other fields. [0003] At present, my country has become one of the largest producers, consumers and exporters of lithium-ion batteries. According to the forecast of China Automotive Technology and Research Center, by 2020, the cumulative scrap volume of electric vehicle power batte...

AI Technical Summary

Problems solved by technology

[0004] The production of ternary positive electrode material precursors uses cobalt sulfate crystals, nickel sulfate crystals, etc. as the main raw materials, and the production cost is high. However, the positive electrode materials obtained by processing waste lithium-ion batteries can be used to synthesize ternary positive electrode material precursors, and there are already Existence of relevant prior art

Existing recovery methods usually require multi-step extraction operations to remove metal impurities in the solution, and there are problems such as complex process, high energy consumption, and solvent loss of the extractant; Material positive plate, has certain limitations