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Preparation method of positive electrode active material for lithium ion battery

A positive active material, lithium-ion battery technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as environmental pollution and increased costs, and achieve the effects of reduced production costs, regular shape, and uniform particle size distribution

Active Publication Date: 2017-01-11
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 ammonia water and other pH regulators and complexing agents 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 positive electrode active material for lithium ion battery
  • Preparation method of positive electrode active material for lithium ion battery
  • Preparation method of positive electrode active material for lithium ion battery

Examples

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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 in the metal source includes one or more of Mn, Co, Ni, Fe and V;

[0024] S2, choose lithium carbonate as precipitating agent, be configured into lithium carbonate solution or lithium carbonate suspension;

[0025] S3, the metal ion solution and the lithium carbonate solution or lithium carbonate suspension flow into the reactor to form a mixed solution for precipitation reaction, and by adjusting the flow of the metal ion solution and the lithium carbonate solution or carbonic acid The flow of the lithium suspension adjusts the pH value of the mixed solution to obtain carbonate precipitates;

[0026] S4, separa...

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) Add a small amount of deionized water into the reactor, and at a stirring speed of 1000rpm, control the reaction temperature to 45°C, and pump the above-mentioned lithium carbonate lithium carbonate suspension and the metal ion solution into the reactor in parallel. The metal ion solution is pumped into the reaction kettle with a flow rate of 10ml / min for reaction, and the flow rate of the lithium carbonate suspension is controlled so that the pH value of the reaction system is controlled to be 8.0 ± 0.1 to obtain a carbonate precipitate;

[0048] (4) separating...

Embodiment 2

[0053] (1) Weigh nickel sulfate, magnesium sulfate and manganese sulfate respectively according to the molar ratio 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 1.5mol / L;

[0054] (2) Disperse lithium carbonate with deionized water to form a lithium carbonate suspension, and the mass ratio of lithium carbonate to deionized water is 1:6;

[0055] (3) Add a small amount of deionized water into the reactor, and at a stirring speed of 1400rpm, control the reaction temperature to 50°C, and pump the above-mentioned lithium carbonate lithium carbonate suspension and the metal ion solution into the reactor in parallel. The metal ion solution is pumped into the reaction kettle with a flow rate of 12ml / min for reaction, and the flow rate of the lithium carbonate suspension is controlled so that the pH value of the reaction system is controlled to be 8.0 ± 0.1 to obtain a carbonate precipitate; ...

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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 of the metal source comprises one or more of Mn, Co, Ni, Fe and V; selecting lithium carbonate as a precipitant and preparing a lithium carbonate solution or lithium carbonate suspension; enabling the metal ion solution and the lithium carbonate solution or the lithium carbonate suspension to parallelly flow into a reaction kettle to form a mixed solution for precipitation reaction, and adjusting the pH value of the mixed solution by adjusting the flow of the metal ion solution and the flow of the lithium carbonate solution or the lithium carbonate suspension to obtain carbonate precipitate; mixing the carbonate precipitate and 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 Patents(China)
IPC IPC(8): H01M4/505H01M4/525
CPCH01M4/505H01M4/525Y02E60/10
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