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Ternary positive electrode material precursor and preparation method thereof

A cathode material and precursor technology, which is applied in the field of precursors of ternary cathode materials and their preparation, can solve the problems of little change in the porosity of the precursor shape, poor controllability of the anaerobic environment, and difficulty in commercial application. Achieve the effect of high sphericity, low cost and loose structure

Active Publication Date: 2022-04-29
JINCHI ENERGY MATERIALS CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method greatly reduces the production cost and impurity content, it is easy to generate bubbles during the synthesis process, and the porosity of the precursor shape is not changed much, and the controllability of the anaerobic environment is poor, so it is difficult for commercial application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The precursor synthesis steps are as follows:

[0046] (1) Prepare a mixed salt solution containing nickel sulfate, cobalt sulfate and manganese sulfate according to the molar ratio of nickel, cobalt and manganese metal ions at a ratio of 6:2:2. The three metal ions of nickel, cobalt and manganese in the mixed salt solution The total molar concentration of the solution is 2mol / L; prepare a 4mol / L sodium hydroxide solution; prepare a 6mol / L ammonia solution as a complexing agent.

[0047] (2) Add pure water, sodium hydroxide solution and ammonia solution to the 300L reactor as the bottom liquid, adjust the temperature of the reactor to 55°C, adjust the pH value to 11.32 with sodium hydroxide, and adjust the ammonium ion concentration with ammonia water Be 2g / L, feed nitrogen 3h in the reactor simultaneously, nitrogen flow rate is 10 L / h.

[0048] (3) In the first stage of the synthesis reaction, a peristaltic pump was used to inject mixed salt solution, alkali solution ...

Embodiment 2

[0053] To prepare the ternary precursor, the steps are as follows:

[0054] (1) Prepare a mixed salt solution containing nickel sulfate, cobalt sulfate and manganese sulfate according to the molar ratio of nickel, cobalt and manganese metal ions at a ratio of 6:2:2. The three metal ions of nickel, cobalt and manganese in the mixed salt solution The total molar concentration of the solution is 2mol / L; prepare a 4mol / L sodium hydroxide solution; prepare a 6mol / L ammonia solution as a complexing agent.

[0055] (2) Add pure water, sodium hydroxide solution and ammonia solution to the 300L reactor as the bottom liquid, and at the same time control the temperature of the reactor to 55°C, adjust the pH value to 11.51 with sodium hydroxide, and adjust the ammonium ion with ammonia water Concentration is 6g / L, feeds nitrogen into reactor simultaneously 3h, and nitrogen flow rate is 10 L / h.

[0056] (3) In the first stage of the synthesis reaction, a peristaltic pump was used to injec...

Embodiment 3

[0059] Prepare nickel-cobalt-manganese ternary precursor, the steps include:

[0060] (1) Prepare a mixed salt solution containing nickel sulfate, cobalt sulfate and manganese sulfate according to the molar ratio of nickel, cobalt and manganese metal ions at a ratio of 6:2:2. The three metal ions of nickel, cobalt and manganese in the mixed salt solution The total molar concentration of the solution is 2mol / L; prepare a 4mol / L sodium hydroxide solution; prepare a 6mol / L ammonia solution as a complexing agent.

[0061] (2) Add pure water, sodium hydroxide solution and ammonia solution to the 300L reactor as the bottom liquid, and at the same time control the temperature of the reactor to 55°C, adjust the pH value to 11.51 with sodium hydroxide, and adjust the ammonium ion with ammonia water Concentration is 3g / L, feeds nitrogen into reaction kettle simultaneously 3h, and nitrogen flow rate is 10 L / h.

[0062] (3) In the first stage of the synthesis reaction, a peristaltic pump...

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Abstract

The invention belongs to the technical field of lithium ion battery materials, and discloses a synthesis method of a precursor of a ternary positive electrode material. The precursor synthesis process comprises three stages, the first stage is a rapid nucleation stage, the second stage is a middle constant-speed growth stage, and the third stage is a slow growth stage. The morphology and performance of the precursor are controlled by adjusting the pH values of different stages, the flow of the mixed salt solution, the flow of the oxidizing gas and the rotating speed. The particle size of the precursor in the growth stage can be controlled by adjusting the pH value and the flow of the mixed salt solution; primary particles can be refined by adjusting the flow and the rotating speed of the oxidizing gas, the agglomeration phenomenon of the primary particles is improved, the sphericity degree of the precursor can be improved by adjusting the low ammonia concentration, and the precursor which is loose, porous and high in sphericity degree is obtained. In addition, the prepared precursor is large in specific surface area and high in tap density.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery materials, and in particular relates to a precursor of a ternary positive electrode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries have gradually become the most important secondary batteries because of their advantages such as high energy density, good safety performance, long cycle life, and good environmental compatibility. As a convenient energy source, lithium-ion batteries have been widely used in mobile electronic devices such as mobile phones, tablets, and laptops. In addition, as the society calls for clean travel, new energy hybrid electric vehicles (HEV) and pure electric vehicles (EV) have been vigorously developed. Due to various objective factors, it will take a long time for pure electric vehicles to fully popularize. Over time, the development of hybrid electric vehicles has become an unavoidable technical route for mains...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00
CPCC01G53/006C01P2004/61C01P2006/12C01P2004/01C01P2006/10
Inventor 熊海龙胡海诗刘凯张海艳胡志兵苏帅
Owner JINCHI ENERGY MATERIALS CO LTD
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