Synthesis method of liquid phase doped ternary precursor

Abstract

The invention discloses a synthetic method of a liquid-phase doped ternary precursor. The synthetic method comprises the following steps: (1) weighing nickel, cobalt, manganese sulfate and water to obtain a solution A; (2) weighing a sodium hydroxide solution and an aluminum sulfate solution, and mixing the two solutions in the mass ratio of (2 to 4) to (1 to 2) to obtain a solution B; (3) weighing the sodium hydroxide solution and deionized water to obtain a solution C; (4) weighing concentrated ammonia water and deionized water to obtain a solution D; (5) adding the solution A, the solutionB, the solution C and the solution D into a reaction kettle according to the proportion of (2 to 4) to (0.1 to 2) to (3 to 5) to (1 to 3), and reacting at the temperature of 50 to 70 DEG C for 30 to 60h while controlling the pH at 11 to 12.5 in order to obtain the ternary precursor. The method is simple, is convenient to operate, and is low in cost; doping elements and the precursor can be evenlymixed on the molecular level.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a method for synthesizing a liquid phase doped ternary precursor. Background technique [0002] Nickel-cobalt-manganese ternary material is a new type of lithium-ion battery material developed in recent years. It has the advantages of high capacity, high working voltage and moderate cost, but also has problems such as poor structural stability. By adding doping elements, structural stability and electrochemical performance can be effectively improved. The prior art mainly adopts solid-phase method for doping, and it is difficult to ensure the uniformity of solid-phase mixing, which affects the stability and uniformity of the product. [0003] In the prior art, a liquid-phase doping method is also used to synthesize a ternary precursor. For example, the publication number is CN 103840133B, and the title of the invention is "Preparation method of a rare earth-doped high-compac...

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Problems solved by technology

[0004] Comparative document 1 uses liquid phase doping to synthesize ternary precursors, which requires the use of rare earth compounds. Rare earth compounds are relatively scarce and expensive, resulting in narrow application range and high cost of comparative document 1.

Moreover, the preparation method of Reference Document 1 has a complicated process and requires multiple processes such as ball milling, drying, firing, dispersing, washing, and re-drying. It is inconvenient to implement, takes a long time, and has high production costs.

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