Nickel cobalt lithium manganate composite cathode material and preparation method of nickel cobalt lithium manganate composite cathode material

A composite cathode material, lithium nickel cobalt manganate technology, applied in battery electrodes, electrical components, circuits, etc., can solve problems such as environmental pollution, and achieve the effects of no environmental pollution, small specific surface area, and high tap density

Active Publication Date: 2012-10-03
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method uses a large amount of ammonia water as a precipitant during the synthesis of the precursor, which causes a lot of pollution to the environment.

Method used

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  • Nickel cobalt lithium manganate composite cathode material and preparation method of nickel cobalt lithium manganate composite cathode material
  • Nickel cobalt lithium manganate composite cathode material and preparation method of nickel cobalt lithium manganate composite cathode material
  • Nickel cobalt lithium manganate composite cathode material and preparation method of nickel cobalt lithium manganate composite cathode material

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Experimental program
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Embodiment 1

[0031] The nickel-cobalt lithium manganate composite cathode material of the present embodiment has a chemical formula of LiNi 0.5 co 0.3 mn 0.2 o 2 .

[0032] Its preparation method comprises the following steps:

[0033] (1) Weigh 262.86 g of nickel sulfate hexahydrate, 168.69 g of cobalt sulfate heptahydrate, 67.6 g of manganese sulfate dihydrate, and 11.69 g of ethylenediaminetetraacetic acid, dissolve them in 1L of deionized water, stir to mix evenly; weigh 161.64 g of sodium hydroxide, dissolved in 1L of deionized water; then the mixed solution of nickel-cobalt-manganese salt and sodium hydroxide solution were added to the stirred reactor with an ultrasonic device at a rate of 600 mL / h, and the stirrer was turned on Stir with an ultrasonic instrument, control the reaction temperature to 45 ° C, the ultrasonic frequency to 20KHz, and react for 3 h under the condition of a stirring speed of 1000 r / min, to obtain a gray-brown suspension of nickel-cobalt-manganese compos...

Embodiment 2

[0039] The nickel-cobalt lithium manganate composite cathode material of the present embodiment has a chemical formula of LiNi 0.5 co 0.3 mn 0.2 o 2 .

[0040] Its preparation method comprises the following steps:

[0041] (1) Weigh 262.86 g of nickel sulfate hexahydrate, 168.69 g of cobalt sulfate heptahydrate, 67.6 g of manganese sulfate dihydrate, and 7.69 g of citric acid, dissolve them in 1L of deionized water, stir to mix evenly; weigh 161.64 g of hydroxide Sodium, dissolved in 1L deionized water; then the mixed solution of nickel-cobalt-manganese salt and sodium hydroxide solution were added to the stirred reactor with ultrasonic device at a rate of 600 mL / h, and the stirrer and ultrasonic device were turned on Stirring is carried out, the reaction temperature is controlled to be 45°C, the ultrasonic frequency is 30KHz, and the stirring speed is 600 r / min, and the reaction is carried out for 3 h to obtain a gray-brown suspension of nickel-cobalt-manganese composite ...

Embodiment 3

[0047] The nickel-cobalt lithium manganate composite cathode material of the present embodiment has a chemical formula of LiNi 0.5 co 0.3 mn 0.2 o 2 .

[0048] Its preparation method comprises the following steps:

[0049] (1) Weigh 237.69 g of nickel chloride hexahydrate, 142.76 g of cobalt chloride hexahydrate, 50.36 g of manganese chloride, and 11.69 g of ethylenediaminetetraacetic acid, dissolve them in 1L of deionized water, and stir to mix them evenly; weigh 160.84 g of sodium hydroxide was dissolved in 1L of deionized water; then the mixed solution of nickel-cobalt-manganese salt and sodium hydroxide solution were added to the stirred reactor with an ultrasonic device at a rate of 600 mL / h, and the stirring was started Stir with an ultrasonic instrument and an ultrasonic instrument, control the reaction temperature to 40°C, and the ultrasonic frequency to 40KHz. Under the condition of a stirring speed of 1000 r / min, react for 2 h to obtain a gray-brown suspension of...

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Abstract

The invention relates to a nickel cobalt lithium manganate composite cathode material and a preparation method of the nickel cobalt lithium manganate composite cathode material. The nickel cobalt lithium manganate composite cathode material has the chemical formula of Li(NixCoyMn<1-x-y>)O2. The preparation method comprises the steps that after soluble nickel salts, cobalt salts, manganese salts and complexing agents are uniformly mixed, sodium hydroxide precipitating agents are added, the reaction is carried out in a stirring reactor with an ultrasonic device, composite hydroxides of nickel cobalt manganate are obtained, then, the composite hydroxides, water soluble macromolecular compounds and lithium source compounds are placed in the stirring reactor with the ultrasonic device, the spray drying is carried out in the ultrasonic reinforced stirring mixing process, and nickel cobalt lithium manganate precursors are obtained, the precursors are subjected to primary sintering under the certain atmosphere protection, and nickel cobalt lithium manganate products are obtained. When the nickel cobalt lithium manganate composite cathode material and the preparation method are adopted, the prepared product particles are uniform, the morphology is regular, the specific surface area is small, the tap density is high, the electrochemical performance is excellent, the processing performance is good, the cost is low, the environment-friendly effect is realized, and the environment pollution is avoided.

Description

technical field [0001] The invention relates to a lithium-ion battery composite cathode material and a preparation method thereof, in particular to a lithium-ion battery nickel-cobalt-lithium manganese oxide composite cathode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the advantages of good safety, high discharge specific energy, long charge and discharge life, etc., and have been widely used in digital products, electric tools and electric bicycles and other fields. With the continuous consumption of energy resources such as oil, people have deepened their understanding of the energy crisis. As a key component of electric vehicles and hybrid vehicles, lithium-ion power batteries have attracted more and more attention. [0003] Lithium-ion battery cathode materials are the most critical part of lithium-ion batteries. The current lithium-ion battery cathode materials on the market mainly include lithium cobalt oxide, li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525
CPCY02E60/122Y02E60/10
Inventor 张宝张佳峰彭春丽陈核章王健龙郑俊超
Owner CENT SOUTH UNIV
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