Positive electrode material precursor, preparation method and applications thereof

A cathode material and precursor technology, which is applied in the field of cathode material precursors and their preparation, can solve the problems of low tap density and cannot meet the high energy density of lithium ion battery cathode materials, and achieves the effect of satisfying high energy density

Active Publication Date: 2020-02-21
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, it is necessary for the present invention to provide a positive electrode material precursor and its preparation method and use. Through three-stage co-precipitation reaction, during the co-precipitation reaction process, small, sized seed particles are generated at a specific higher pH , in a specific lower pH, the particles are generated according to the corresponding speed, so that by controlling the regulation of different reaction conditions, reaction time and feed flow rate, the precursor of the positive electrode material with high tap density can be directly obtained in one step, which solves the existing problem The tap density of the commercial ternary cathode material precursor is low, which cannot meet the technical problem of high energy density of lithium-ion battery cathode materials

Method used

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  • Positive electrode material precursor, preparation method and applications thereof
  • Positive electrode material precursor, preparation method and applications thereof

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Embodiment 1

[0036] According to the molar ratio of Ni:Co:Mn=5:2:3, weigh NiSO4 ·6H 2 O. CoSO 4 ·7H 2 O, MnSO 4 1H 2 O is dissolved in deionized water, and 50L of Ni+Co+Mn total metal molar concentration of configuration is 2mol / L salt solution; NaOH is dissolved in deionized water, and a 4mol / L alkali solution is configured; Prepare an ammonia solution with a concentration of 7mol / L; measure concentrated sulfuric acid, dilute and prepare a sulfuric acid solution with a concentration of 4mol / L for later use.

[0037] Add 1.7L of ammonia solution to the 20L reactor, then add deionized water until the kettle is full, stir the reactor (rotation speed: 800rpm), heat to 55°C, feed high-purity nitrogen to remove dissolved oxygen, and add alkali through a peristaltic pump Solution, adjust the pH value of the solution to 11.7, then add salt, alkali, and ammonia solution at the same time, set the flow rate of the salt solution to 10mL / min, and the flow rate of the ammonia solution to 1.8mL / min,...

Embodiment 2

[0040] According to the molar ratio of Ni:Co:Mn=6.5:1.5:2, weigh NiSO 4 ·6H 2 O. CoSO 4 ·7H 2 O, MnSO 4 1H 2 O is dissolved in deionized water, and 50L of Ni+Co+Mn total metal molar concentration of configuration is 2mol / L salt solution; NaOH is dissolved in deionized water, and a 4mol / L alkali solution is configured; Prepare an ammonia solution with a concentration of 7mol / L; measure concentrated sulfuric acid, dilute and prepare a sulfuric acid solution with a concentration of 4mol / L for later use.

[0041] Add 1.7L of ammonia solution to the 20L reactor, then add deionized water until the kettle is full, stir the reactor (rotation speed: 800rpm), heat to 58°C, feed high-purity nitrogen to remove dissolved oxygen, and add alkali through a peristaltic pump Solution, adjust the pH value of the solution to 11.8, then add salt, alkali, and ammonia solution at the same time, set the flow rate of the salt solution to 23mL / min, and the flow rate of the ammonia solution to 4.1m...

Embodiment 3

[0044] According to the molar ratio of Ni:Co:Mn=8.3:1.1:0.6, weigh NiSO 4 ·6H 2 O. CoSO 4 ·7H 2 O, MnSO 4 1H 2 O is dissolved in deionized water, and 50L of Ni+Co+Mn total metal molar concentration of configuration is 2mol / L salt solution; NaOH is dissolved in deionized water, and a 4mol / L alkali solution is configured; Prepare an ammonia solution with a concentration of 7mol / L; measure concentrated sulfuric acid, dilute and prepare a sulfuric acid solution with a concentration of 4mol / L for later use.

[0045] Add 1.7L of ammonia solution to the 20L reactor, then add deionized water until the kettle is full, stir the reactor (rotation speed: 800rpm), heat to 52°C, feed high-purity nitrogen to remove dissolved oxygen, and add alkali through a peristaltic pump Solution, adjust the pH value of the solution to 11.8, then add salt, alkali, and ammonia solution at the same time, set the flow rate of the salt solution to 19mL / min, and the flow rate of the ammonia solution to 2....

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Abstract

The invention discloses a positive electrode material precursor, a preparation method and applications thereof. The preparation method comprises:carrying out a three-stage co-precipitation reaction ona salt solution, an alkali solution and an ammonia solution to obtain a product, wherein each stage of the co-precipitation reaction comprises a seed crystal generation process under a high pH condition and a crystal grain constant-speed growth process under a low pH condition; and aging, washing and drying the product to obtain a positive electrode material precursor. According to the invention,the precursor material formed by mixing large and small secondary spherical particles, wherein the octahedral gaps and the tetrahedral gaps between the large particles are filled with the small particles so as to meet the close packing requirements of the material; compared with the conventional ternary precursor material, the material of the invention has the increased tap density of 2.2-2.5 g/cc, and easily meets the requirements of lithium ion batteries on high energy density at present; and the method is simple in process, controllable in productivity and easy for large-scale production and application.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a positive electrode material precursor and its preparation method and application. Background technique [0002] Lithium-ion battery is a secondary battery (rechargeable battery) that mainly relies on the movement of lithium ions between the positive and negative electrodes to work. During the charging and discharging process, Li+ intercalates and deintercalates back and forth between the two electrodes: when charging, Li+ is deintercalated from the positive electrode, intercalated into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; the opposite is true during discharge. With the rapid development of social economy, it is more and more urgent to develop and utilize new energy. Among them, the new lithium-ion battery is a clean energy, which has the advantages of safety, high cycle, long life and environmenta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00H01M4/505H01M4/525H01M10/0525
CPCC01G53/006H01M4/505H01M4/525H01M10/0525C01P2004/03C01P2004/61Y02E60/10
Inventor 雷天起陈龙高二平
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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