Method for preparing lithium ion battery anode material nickle cobalt lithium manganate

A kind of technology of lithium nickel cobalt manganate and lithium ion battery

Active Publication Date: 2009-01-28
CHANGSHA RES INST OF MINING & METALLURGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantages of this method are as follows: firstly, due to the slow diffusion rate of the solid phase, it is difficult to mix the materials uniformly, and there are large differences in the structure and composition of the product, which makes it difficult to control the electrochemical performance; secondly, the bulk density of the synthesized powder material Low, the general tap density is only 1.6 ~ 1.8g/cm3,

Method used

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  • Method for preparing lithium ion battery anode material nickle cobalt lithium manganate
  • Method for preparing lithium ion battery anode material nickle cobalt lithium manganate
  • Method for preparing lithium ion battery anode material nickle cobalt lithium manganate

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Example 1 Three equimolar sulfates of nickel, manganese and cobalt were prepared into 10 liters of a solution with a concentration of 2M (the total concentration of the three metal ions, the same below, not specifically described). and 2M ammonium carbonate solution are added into the reactor at the same time, and the reaction pH value is controlled at 8.0-9.0. After the reaction was completed, the precipitate was filtered and washed. Add pure water to the washed filter cake to make a slurry, add 21 moles of lithium hydroxide evenly into the slurry, and then disperse the slurry. The dispersed slurry is spray-dried to obtain a precursor. The precursor was heated at a rate of 3°C / min to 800°C for 5 hours, and then cooled with the furnace. The primary fired material is pulverized and then heated to 980°C at a speed of 3°C / min for 20 hours, and then cooled with the furnace to obtain the final product. The X-ray diffraction analysis of the obtained product shows that its ...

Embodiment 2

[0030] Example 2 Three equimolar hydrochlorides of nickel, manganese and cobalt were prepared into 10 liters of solution with a concentration of 2M. and 2M sodium carbonate solution are added into the reactor at the same time, and the reaction pH value is controlled at 7.5-10.0. After the reaction was completed, the precipitate was filtered and washed. Add pure water to the washed filter cake to make a slurry, add 20.8 moles of lithium hydroxide evenly into the slurry, and then disperse the slurry. The dispersed slurry is spray-dried to obtain a precursor. The temperature of the precursor was raised to 700°C at a rate of 5°C / min for 10 hours, and then cooled with the furnace. The primary fired material is pulverized and then heated to 1000°C at a speed of 4°C / min for 20 hours, and then cooled with the furnace to obtain the final product. The X-ray diffraction analysis of the obtained product shows that its phase is a layered structure; the tap density is 2.35g / cm 3 ;The pr...

Embodiment 3

[0031] Example 3 Three equimolar sulfates of nickel, manganese and cobalt were prepared into 10 liters of solution with a concentration of 2M. and 2M sodium carbonate solution are added into the reactor at the same time, and the reaction pH value is controlled at 8.0-10.0. After the reaction was completed, the precipitate was filtered and washed. Add pure water to the washed filter cake to make a slurry, add 22 moles of lithium hydroxide evenly into the slurry, and then disperse the slurry. The dispersed slurry is spray-dried to obtain a precursor. The temperature of the precursor was raised to 850°C for 10 hours at a rate of 6°C / min, and the material was cooled at a cooling rate of 3°C / min. After primary burning, the material is pulverized and then heated to 1000°C at a speed of 3°C / min for 20 hours, and cooled at a cooling rate of 4°C / min to obtain the final product. The X-ray diffraction analysis of the obtained product shows that its phase is a layered structure; the ta...

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Abstract

The invention relates to a method for preparing a LiCoxNiyMnzO2 anode material for a lithium ion battery. The method comprises the following steps that soluble salts of nickel, cobalt and manganese undergo coprecipitation to prepare composite carbonate of nickel, manganese and cobalt; then, the carbonate is reacted with lithium hydroxide; moreover, when the carbonate is converted into hydroxide, lithium is deposited on the surface of the prior particles containing nickel, cobalt and manganese in the form of lithium carbonate. In this way, even mixing of lithium and elements such as nickel, cobalt and manganese is realized to obtain a top-quality precursor for preparing the LiCoxNiyMnzO2 material; moreover, the precursor can be made into a LiCoxNiyMnzO2 product with excellent properties after twice sintering. The method has the advantages of simple and easily controlled technological process, low production cost of prepared product and stable and controllable product performance, and can be used in industrial production.

Description

technical field [0001] The invention relates to a preparation method of a positive electrode material of a lithium ion battery, in particular to a preparation method of nickel cobalt lithium manganese oxide, a positive electrode material of a lithium ion battery. Background technique [0002] One of the key materials of lithium-ion batteries is the cathode material. The most widely used cathode material is LiCoO 2 (lithium cobaltate). However, because cobalt resources are scarce and expensive, and there are certain safety hazards during overcharging, LiCoO 2 The application in high-capacity batteries has been restricted. [0003] Nickel-cobalt lithium manganese oxide material is a new type of positive electrode material for lithium-ion batteries. Its typical representative is a ternary transition metal oxide positive electrode material composed of Ni, Co, and Mn in equal amounts. Its molecular formula for LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 . Because two-thirds (or more) of ...

Claims

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Application Information

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IPC IPC(8): H01M4/58C01G45/12H01M4/505H01M4/525
CPCY02E60/10
Inventor 湛中魁李普良习小明张瑾瑾徐舜董正强周春仙
Owner CHANGSHA RES INST OF MINING & METALLURGY
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