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Method for preparing rare earth element-doped nickel cobalt lithium manganate positive electrode material

A technology of nickel-cobalt lithium manganese oxide and rare earth elements, which is applied in the field of preparation of nickel-cobalt lithium manganese oxide cathode materials, can solve problems such as lack of cobalt resources, high cost of lithium-ion batteries, and limited expansion of application fields, and achieve excellent cycle performance , low price of raw materials, high tap density

Inactive Publication Date: 2014-04-16
SHANDONG GOLDENCELL ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004]Commercial lithium-ion batteries mainly use LiCoO2 as the positive electrode material. Due to the lack of cobalt resources, the cost of lithium-ion batteries is high, which limits the The expansion of its application field, especially in the application of power battery

Method used

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  • Method for preparing rare earth element-doped nickel cobalt lithium manganate positive electrode material
  • Method for preparing rare earth element-doped nickel cobalt lithium manganate positive electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Nickel sulfate, cobalt sulfate and manganese sulfate were selected as raw materials, configured into a 2moL / L solution, and added to a four-necked flask. The rare earth salt ceric sulfate accounted for 2% of the total mass of nickel sulfate, cobalt sulfate and manganese sulfate. Then ceric sulfate was added to the solution to dissolve. Configure 15% ammonia water and 4moL / L sodium hydroxide. The ratio of ammonia water to the total molar amount of nickel, cobalt and manganese in nickel sulfate, cobalt sulfate and manganese sulfate solution is 0.2:1.

[0024] The prepared ammonia water was dripped into the solution with a constant pressure funnel, and complexed for 50 minutes. Sodium hydroxide was then added dropwise to control the pH of the solution to be about 12. After aging for 10 hours, the filtered precursor was vacuum dried for 5 hours.

[0025] The dried precursor is mixed with lithium carbonate according to a certain ratio, and mixed by wet mechanical ball mil...

Embodiment 2

[0029] Select nickel sulfate, cobalt sulfate and manganese sulfate as raw materials, prepare a 2moL / L solution, and add it to a four-necked flask. The rare earth salt lanthanum nitrate accounts for 2% of the total mass of nickel sulfate, cobalt sulfate and manganese sulfate. Lanthanum nitrate was then added to the solution to dissolve. Configure 15% ammonia water and 4moL / L sodium hydroxide. The ratio of ammonia water to the total molar amount of nickel, cobalt and manganese in nickel sulfate, cobalt sulfate and manganese sulfate solution is 0.5:1.

[0030] The prepared ammonia water was dripped into the solution with a constant pressure funnel, and complexed for 50 minutes. Sodium hydroxide was then added dropwise to control the pH of the solution to be about 12. After aging for 10 hours, the filtered precursor was vacuum dried for 5 hours.

[0031] The dried precursor is mixed with lithium hydroxide according to a certain ratio, and mixed by wet mechanical ball milling. ...

Embodiment 3

[0034] Select nickel sulfate, cobalt sulfate and manganese sulfate as raw materials, prepare a 2moL / L solution, and add it to a four-necked flask. The rare earth salts of ceric sulfate and lanthanum nitrate account for 2% of the total mass of nickel sulfate, cobalt sulfate and manganese sulfate. Then ceric sulfate and lanthanum nitrate were added to the solution to dissolve. Configure 15% ammonia water and 4moL / L sodium hydroxide. The ratio of ammonia water to the total molar amount of nickel, cobalt and manganese in nickel sulfate, cobalt sulfate and manganese sulfate solution is 1.0:1.

[0035] The prepared ammonia water was dripped into the solution with a constant pressure funnel, and complexed for 50 minutes. Sodium hydroxide was then added dropwise to control the pH of the solution to be about 12. After aging for 10 hours, the filtered precursor was vacuum dried for 5 hours.

[0036] The dried precursor is mixed with lithium hydroxide according to a certain ratio, and...

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Abstract

The invention discloses a method for preparing a rare earth element-doped nickel cobalt lithium manganate positive electrode material. The method comprises the following steps: dissolving nickel cobalt manganese salts in water to prepare a solution, adding a rare earth soluble salt, preparing ammonia water by taking ammonia water serving as a complexing agent according to a salt ammonia ratio, and preparing into a solution with NaOH as a precipitator; respectively adding the ammonia water and sodium hydroxide in a nitrogen atmosphere under the condition of water bath temperature of 70 DEG C, and stirring during the reaction process so that the reaction can be uniform; stirring and ageing for 10-15 hours, filtering the obtained reaction solution to obtain a precursor of nickel cobalt lithium manganate, performing microwave drying, and drying in a vacuum drying oven for 5 hours; mixing the precursor with a lithium salt, and mechanically performing ball milling and mixing through a wet method; sintering the material at the treatment temperature of 700-850 DEG C, and introducing oxygen in the sintering process; and grinding the material subjected to complete sintering, and allowing the material to pass through a 325-mesh sieve, thus obtaining the final product.

Description

[0001] technical field [0002] The invention relates to a method for modifying a lithium-ion secondary battery nickel-cobalt-lithium-manganese-oxide cathode material by doping rare earth elements, in particular to a preparation method for a rare-earth element-doped nickel-cobalt-lithium manganate cathode material. Background technique [0003] In recent years, in response to the negative impacts such as environmental pollution and the rapid consumption of oil resources brought about by the rapid development of the automobile industry, countries are actively carrying out research on electric vehicles EV and hybrid electric vehicles HEV using clean energy, and regard them as future automobiles. The inevitable direction of industrial development, in which the power battery as vehicle power directly affects the performance of electric vehicles, and has become the main bottleneck in the development of EVs and HEVs. As the main candidate power source for future electric vehicles, ...

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 关成善宗继月孟博薛娟娟
Owner SHANDONG GOLDENCELL ELECTRONICS TECH
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