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Preparation method of ternary precursor with controllable structure

A technology of structure control agent and precursor, applied in structural parts, chemical instruments and methods, electrical components, etc., can solve the problem of affecting the crystal structure and sphericity of ternary precursors, affecting electrochemical performance, and increasing manufacturing costs To achieve the effect of promoting the improvement of electrochemical performance, reducing the difficulty of washing, and controlling the degree of compactness

Inactive Publication Date: 2020-11-17
ZHUJI PAWA NEW ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method will seriously affect the crystal structure and sphericity of the ternary precursor, making it difficult to reduce the sodium-sulfur content of the ternary precursor during the later washing process, increasing the manufacturing cost and affecting the electrochemical performance.

Method used

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  • Preparation method of ternary precursor with controllable structure

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Embodiment 1

[0033] This embodiment includes the following steps:

[0034] (1) Prepare the reaction kettle bottom liquid according to the concentration of ammonia water at 1mol / L and the pH value at 12.0;

[0035] (2) Prepare ammonium nitrate solution with a concentration of 0.2mol / L as the structure control agent solution;

[0036] (3) Prepare a ternary metal salt solution of nickel: cobalt: manganese = 6:2:2 (molar ratio);

[0037] (4) Inject the ternary metal salt solution, ammonia water, sodium hydroxide solution, and structure control agent solution into the bottom liquid of the reaction kettle, keep the temperature of the reaction kettle at 50°C, and keep the nitrogen atmosphere to react for 5 hours to obtain the reaction slurry;

[0038] (5) Heat the reaction slurry to 90°C to decompose ammonium nitrate to generate nitrogen, and keep stirring for 3 hours;

[0039] (6) The reaction slurry after step (5) was washed with pure water at 60°C for 3h, and then dried in a blast oven at a ...

Embodiment 2

[0042] This embodiment includes the following steps:

[0043] (1) Prepare the reaction bottom solution according to the ammonia concentration of 0.8mol / L and the pH value of 11.5;

[0044] (2) Prepare ammonium nitrate solution with a concentration of 0.1mol / L as the structure control agent solution;

[0045] (3) Prepare a ternary metal salt solution of nickel: cobalt: manganese = 8:1:1 (molar ratio);

[0046] (4) Inject the ternary metal salt solution, ammonia water, sodium hydroxide solution, and structure control agent solution into the reaction bottom liquid, keep the temperature of the reactor at 60°C, and keep the nitrogen atmosphere for 3 hours to obtain the reaction slurry;

[0047] (5) Heat the reaction slurry to 80°C to decompose ammonium nitrate to generate nitrogen, and keep stirring for 1 hour;

[0048] (6) The reaction slurry after step (5) was washed with pure water at 70°C for 2 hours, and then dried in a blast oven at a temperature of 130°C for 12 hours to ob...

Embodiment 3

[0051] This embodiment includes the following steps:

[0052] (1) According to the ammonia concentration of 2mol / L and the pH value of 10.5, prepare the bottom liquid of the reaction kettle;

[0053] (2) Prepare a polyacrylamide (molecular weight <2 million) solution with a concentration of 0.5mol / L as the structure control agent solution;

[0054] (3) Prepare a ternary metal salt solution of nickel: cobalt: manganese = 8:1:1 (molar ratio);

[0055] (4) Inject ternary metal salt solution, ammonia water, sodium hydroxide solution, and structure control agent solution into the reaction bottom liquid, keep the temperature of the reactor at 70°C, and keep the nitrogen atmosphere for 5 hours to obtain the reaction slurry;

[0056] (5) Raise the temperature of the reaction slurry to 90°C to decompose polyacrylamide to generate nitrogen, and keep stirring for 3 hours;

[0057] (5) The reaction slurry after step (5) was washed with pure water at 60°C for 2h, and then dried in a blas...

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Abstract

The invention provides a preparation method of a ternary precursor with a controllable structure, belonging to the technical field of positive electrode materials of lithium ion batteries. Accordign to the invention, on the basis of preparing a ternary precursor by using a coprecipitation method, a structure control agent is introduced in a reaction stage; the structure control agent is decomposedat a high temperature to generate gas, so the stacking density degree of the ternary precursor is changed under the condition that the primary particle morphology of the ternary precursor is not changed; and since the gas generated by decomposition of the structure control agent is released from the interior of the ternary precursor to the exterior of the ternary precursor, metal salt which doesnot react completely inside can be brought out of a stacked structure, so the washing difficulty of sodium and sulfur in post-treatment is reduced and the ternary precursor with a low sodium and sulfur level is obtained.

Description

technical field [0001] The invention relates to the field of positive electrode materials for lithium-ion batteries, in particular to a ternary precursor with controllable structure and low sodium-sulfur content and a preparation method thereof. Background technique [0002] At present, the mainstream ternary lithium-ion battery application field is oriented to the power market, that is, to provide energy for electric vehicles. The power market requires lithium batteries to have excellent rate performance, and they can have better performance when discharged at different rates. This development route requires the cathode material in the ternary lithium battery to improve the diffusion efficiency of lithium ions and meet the rate requirement. The structure of the ternary cathode material is inherited, that is, the main body of its structure comes from the ternary precursor. Therefore, in order to improve the diffusion efficiency of lithium ions, it is necessary to start dir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00H01M4/505H01M4/525H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01G53/006C01P2004/03C01P2004/64C01P2006/12C01P2006/17C01P2006/80H01M4/505H01M4/525H01M10/0525H01M2004/028Y02E60/10
Inventor 张宝王振宇
Owner ZHUJI PAWA NEW ENERGY
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