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Preparation method of small-particle size ternary positive material precursor

A cathode material and precursor technology, which is applied in the field of preparation of small particle size ternary cathode material precursors, can solve the problems of poor stability, easy self-discharge, low tap density, etc., and achieves simple process operation, easy recycling, The effect of high tap density

Active Publication Date: 2018-04-17
GUANGDONG JIANA ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The small particle size ternary precursors currently on the market have poor sphericity, poor particle size distribution control, voids in the center, and low tap density, resulting in poor cycle performance, poor stability, and easy self-discharge of the material. The small capacity and low safety performance of high-voltage power batteries prevent this kind of small particle size material from being better applied

Method used

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  • Preparation method of small-particle size ternary positive material precursor

Examples

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Effect test

Embodiment 1

[0026] The invention discloses a preparation method of a small particle size ternary cathode material precursor, which comprises the following steps:

[0027] (1) Select nickel-cobalt-manganese liquid as the raw material to prepare mixed metal salt solution, add special reaction bottom liquid to the reactor in advance, and add the metal salt solution, complexing agent and precipitant solution in parallel to the reaction according to the stoichiometric ratio In the kettle; the temperature is controlled at 60°C; the pH is controlled at 11.5; the rotating speed is 200r / min; the whole reaction is carried out under N 2 under protection;

[0028] (2) The first time the kettle is full, the D50 particle size is controlled at 1~2μm. When the reactor is full, it will directly overflow from the overflow pipe to the prepared aging kettle, and the particle size in the reactor will grow to 3.5-4.0μm after 20 hours. Immediately stop feeding;

[0029] (3) Then mix the reactor slurry and the...

Embodiment 2

[0033] The invention discloses a preparation method of a small particle size ternary cathode material precursor, which comprises the following steps:

[0034] (1) Select nickel-cobalt-manganese liquid as the raw material to prepare mixed metal salt solution, add special reaction bottom liquid to the reactor in advance, and add the metal salt solution, complexing agent and precipitant solution in parallel to the reaction according to the stoichiometric ratio In the kettle; the temperature is controlled at 40°C; the pH is controlled at 11; the rotating speed is 500r / min; the whole reaction is carried out under the protection of N2;

[0035] (2) The first time the kettle is full, the D50 particle size is controlled at 1~2μm. When the reactor is full, it will directly overflow from the overflow pipe to the prepared aging kettle, and the particle size in the reactor will grow to 3.5-4.0μm after 15 hours. Immediately stop feeding;

[0036] (3) Then mix the reactor slurry and the ag...

Embodiment 3

[0040] The invention discloses a preparation method of a small particle size ternary cathode material precursor, which comprises the following steps:

[0041] (1) Select nickel-cobalt-manganese liquid as the raw material to prepare a metal mixed salt solution, add a special reaction bottom liquid to the reactor in advance, and add the metal salt solution, complexing agent and precipitant solution in parallel to the reaction according to the stoichiometric ratio In the kettle; the temperature is controlled at 20°C; the pH is controlled at 12; the rotating speed is 350r / min; the whole reaction is carried out under the protection of N2;

[0042] (2) The first time the kettle is full, the D50 particle size is controlled at 1~2μm. When the reactor is full, it will directly overflow from the overflow pipe to the prepared aging kettle, and the particle size in the reactor will grow to 3.5-4.0μm after 10 hours. Immediately stop feeding;

[0043] (3) Then mix the reactor slurry and th...

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Abstract

The invention discloses a preparation method of a small-particle size ternary positive material precursor. The preparation method comprises the following steps of (1) selecting a nickel, cobalt and manganese solution as the raw material, preparing into a metal mixing salt solution, adding a special reaction base solution into a reaction kettle in advance, mixing the metal salt solution, a complexing agent and a precipitant according to a stoichiometric number ratio, and adding into the reaction kettle in a cocurrent flow way; (2) filling particles with D50 particle size into the reaction kettle for the first time, and controlling the D50 particle size to 1 to 2mu m; after the reaction kettle is full, directly overflowing the material into a prepared aging kettle via an overflow pipe, and immediately stopping material feeding when the particle size of the particle in the reaction kettle grows to 3.5 to 4mu m after 10 to 20h; (3) washing, screening, and packaging, so as to obtain the small-particle size ternary precursor with particle size of 3 to 4mu m. The preparation method of the small-particle size ternary positive material precursor has the characteristics that the integrity ofthe crystal structure is good, the degree of sphericity is better, the cyclicity is better, the technology operation is simple, the continuous production is realized, and the green and energy-savingeffects are realized.

Description

technical field [0001] The invention relates to the technical field of nickel-cobalt-manganese ternary materials, in particular to a preparation method of a small particle size ternary cathode material precursor. Background technique [0002] On December 30, 2016, the Ministry of Finance, the Ministry of Science and Technology, the Ministry of Industry and Information Technology and the National Development and Reform Commission issued the "Notice on Adjusting the Financial Subsidy Policy for the Promotion and Application of New Energy Vehicles". High, in order to get more subsidies, enterprises will definitely adopt more ternary battery systems with higher energy density. Since the country released restrictions on ternary batteries at the end of the year, ternary power batteries will usher in an explosion next year . Japanese and Korean companies improve the performance of lithium-ion batteries by continuously promoting technological progress and developing new materials, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00H01M4/505H01M4/525H01M10/0525
CPCC01G53/006C01P2002/72C01P2004/03C01P2004/61H01M4/505H01M4/525H01M10/0525H01M2004/028Y02E60/10
Inventor 郑江峰吴理觉文定强梁伟华汤依伟张晨杨娟冉建军
Owner GUANGDONG JIANA ENERGY TECH CO LTD
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