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Preparation method of cathode active material of lithium ion battery

A cathode active material, lithium-ion battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as environmental pollution, increase costs, etc., and achieve the goal of reducing production costs, morphological rules, and stabilizing the formation rate of crystal nuclei. Effect

Active Publication Date: 2014-03-26
XTC NEW ENERGY MATERIALS(XIAMEN) LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, commonly used complexing agents such as pH regulators and ammonia water will not only introduce impurities into the precursor of positive electrode active materials, but also pollute the environment and increase the cost of production.

Method used

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  • Preparation method of cathode active material of lithium ion battery
  • Preparation method of cathode active material of lithium ion battery
  • Preparation method of cathode active material of lithium ion battery

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preparation example Construction

[0022] The embodiment of the present invention provides a kind of preparation method of positive electrode active material of lithium ion battery, it comprises the following steps:

[0023] S1, providing a metal (M) source soluble in the first liquid phase solvent, and using the first liquid phase solvent to configure metal ions (M x+ ) solution, the metal element M includes one or more of Mn, Co, Ni, Fe and V;

[0024] S2, select lithium carbonate as precipitating agent, be configured into lithium carbonate suspension;

[0025] S3, adding the metal ion solution to the lithium carbonate suspension to form a mixed solution for a precipitation reaction to obtain a carbonate precipitate;

[0026] S4, separating and drying the carbonate precipitate; and

[0027] S5, uniformly mixing the carbonate precipitate with the lithium source and then sintering to obtain the positive electrode active material of the lithium ion battery.

[0028] In the above step S1, the metal source may ...

Embodiment 1

[0045] (1) Weigh nickel sulfate and manganese sulfate respectively according to the molar ratio Ni:Mn=1:3, and dissolve them in deionized water to prepare a metal ion solution. The concentration of metal ions in the metal ion solution is 1.2mol / L;

[0046] (2) Disperse lithium carbonate with deionized water to form lithium carbonate suspension, the mass ratio of lithium carbonate to deionized water is 1:8;

[0047] (3) Place the above-mentioned lithium carbonate lithium carbonate suspension in a reactor, and at a stirring speed of 1000rpm, control the reaction temperature to 45°C, pump the metal ion solution into the reactor at a flow rate of 10ml / min for reaction, Obtain carbonate precipitates;

[0048] (4) separating the carbonate precipitate, and drying the carbonate precipitate at 100° C. for 10 hours;

[0049] (5) According to the content of Li, Ni, and Mn in the product of step (4), add LiOH at the ratio of Li:(Ni+Mn)=1.05:2 for uniform mixing and grinding, and heat tre...

Embodiment 2

[0053] (1) Weigh nickel sulfate, magnesium sulfate and manganese sulfate according to the molar ratio of Ni:Mg:Mn=0.48:0.02:1.5, and dissolve them in deionized water to prepare a metal ion solution. The concentration of the metal ion solution is 1.0mol / L;

[0054] (2) Disperse lithium carbonate with deionized water to form lithium carbonate suspension, the mass ratio of lithium carbonate to deionized water is 1:9;

[0055] (3) Place the above-mentioned lithium carbonate lithium carbonate suspension in a reactor, and at a stirring speed of 1000rpm, control the reaction temperature to 25°C, pump the metal ion solution into the reactor at a flow rate of 10ml / min for reaction, Obtain carbonate precipitates;

[0056] (4) separating the carbonate precipitate, and drying the carbonate precipitate at 100° C. for 10 hours;

[0057] (5) According to the content of Li, Ni, and Mn in the product of step (4), add LiOH according to the ratio of Li:(Ni+Mg+Mn)=1.05:2 for uniform mixing and...

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Abstract

The invention relates to a preparation method of a cathode active material of a lithium ion battery. The preparation method comprises the following steps: providing a metal (M) source which can be dissolved in a first liquid-phase solvent and preparing a metal ion (M<x+>) solution by using the first liquid-phase solvent, wherein the metal element M comprises one or more of Mn, Co, Ni, Fe and V; selecting lithium carbonate as a precipitant and preparing lithium carbonate suspension; adding the metal ion solution into the lithium carbonate suspension to form a mixed solution for precipitation reaction to obtain carbonate precipitate; separating and drying the carbonate precipitate; mixing the carbonate precipitate with a lithium source uniformly and sintering to obtain the cathode active material of the lithium ion battery.

Description

technical field [0001] The invention relates to a preparation method of a positive electrode active material of a lithium ion battery, in particular to a method for preparing a positive electrode active material of a lithium ion battery by a precipitation method. Background technique [0002] In lithium-ion batteries, the positive electrode active material is one of the key materials of lithium-ion batteries. The structure and performance of the positive electrode active material are important factors affecting the electrochemical performance of lithium-ion batteries. Therefore, the preparation of lithium-ion battery positive electrodes with low cost and excellent performance Active materials are a very important task. [0003] At present, the preparation methods of cathode active materials for lithium-ion batteries mainly include solid-phase method, precipitation method, sol-gel method and other methods. The solid-phase method is the most common synthesis method, and its s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525
CPCY02E60/122H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 宋阜林建雄谢能建杨金洪钱文连高剑何向明王莉李建军
Owner XTC NEW ENERGY MATERIALS(XIAMEN) LTD
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