Rare earth oxide coated and modified ternary positive electrode material for lithium ion battery and preparation method of rare earth oxide coated and modified ternary positive electrode material

A rare earth oxide and lithium-ion battery technology, applied in battery electrodes, electrical components, secondary batteries, etc., can solve the problem of continuous stirring and evaporating water that consumes a lot of energy, lithium dissolution on the surface of ternary materials, and uniform coating Difficult to control the consistency of coating volume and other issues

Inactive Publication Date: 2021-11-30
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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Problems solved by technology

However, the aqueous solution of the soluble salt used is mixed with the ternary material, which may cause the dissolution of lithium on the surface of the ternary material, and at the same time consume a

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  • Rare earth oxide coated and modified ternary positive electrode material for lithium ion battery and preparation method of rare earth oxide coated and modified ternary positive electrode material
  • Rare earth oxide coated and modified ternary positive electrode material for lithium ion battery and preparation method of rare earth oxide coated and modified ternary positive electrode material
  • Rare earth oxide coated and modified ternary positive electrode material for lithium ion battery and preparation method of rare earth oxide coated and modified ternary positive electrode material

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[0036] The present invention also provides a preparation method of a ternary positive electrode material for a lithium-ion battery coated with a rare earth oxide, comprising the following steps:

[0037] Step 1: Uniformly disperse rare earth oxide nanoparticles in a solvent to obtain a mixed solution. The solvent is preferably absolute ethanol, industrial alcohol, ethylene glycol or deionized water. The uniform dispersion is not particularly limited. According to Conventional methods in this field are sufficient, preferably ultrasonic dispersion, mechanical stirring or physical shaking; the time for uniform dispersion is preferably 5-20 minutes;

[0038] Step 2: Add ternary positive electrode material precursor powder to the above mixed solution, stir and mix evenly to obtain a viscous slurry of ternary positive electrode material precursor evenly coated with rare earth oxide nanoparticles. The ternary material precursor is Ni x co y mn z (OH) 2 or Ni x co y al z (OH) ...

Embodiment 1

[0044] 1) 100 mg of commercially available Gd with a particle size of 100 nm 2 o 3 The particles were placed in 2ml of absolute ethanol and dispersed by ultrasonic for 10min to obtain evenly dispersed Gd 2 o 3 ethanol dispersion.

[0045] 2) Add 5g of Ni 0.6 co 0.05 mn 0.35 (OH) 2 The precursor of the ternary positive electrode material is placed in the above mixed solution, and is homogenized for 5 min at a speed of 2000 rpm / min by a homogenizer to obtain nanometer Gd 2 o 3 Uniformly coated precursor viscous slurry. This addition is equivalent to Gd 2 o 3 The molar ratio to the ternary material precursor is 0.01:1.

[0046] 3) The above viscous slurry was fully dried in an oven at 60°C and sieved, and then the mixed material was mixed with LiOH·H 2 The O powder was weighed and ground and mixed uniformly according to the molar ratio of 1:1.07. Finally, the uniformly mixed raw materials were first kept at 500°C for 3 hours in an air atmosphere, then at 800°C for 5 ...

Embodiment 2

[0049] Concrete steps and reaction conditions are identical with embodiment 1, and difference is, add and Ni respectively in step 1 0.6 co 0.05 mn 0.35 (OH) 2 The ternary material precursors are various rare earth oxides with a molar ratio of 0.01:1, including Y 2 o 3 , La 2 o 3 , CeO 2 、Pr 6 o 11 、Nd 2 o 3 、Sm 2 o 3 、Eu 2 o 3 , Tb 2 o 3 、Dy 2 o 3 、Ho 2 o 3 、Er 2 o 3 、Tm 2 o 3 , Yb 2 o 3 and Lu 2 o 3 , to obtain various rare earth oxide-coated ternary cathode materials.

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Abstract

The invention provides a rare earth oxide coated and modified ternary positive electrode material for a lithium ion battery and a preparation method of the rare earth oxide coated and modified ternary positive electrode material and belongs to the technical field of lithium ion battery positive electrode materials. The rare earth oxide coated and modified ternary positive electrode material is obtained by uniformly mixing nanoscale rare earth oxide particles with a ternary material precursor and lithium salt and then roasting an obtained mixture at high temperature. The invention also discloses a preparation method of the rare earth oxide coated and modified ternary positive electrode material for the lithium ion battery. The rare earth oxide coated and modified ternary positive electrode material obtained by the method shows more excellent charge-discharge cycle stability and rate capability than a ternary material which is not coated and modified at a high voltage of 4.5 V; and the rare earth oxide coated and modified ternary positive electrode material can be widely applied to lithium ion battery positive electrode materials and is suitable for popularization and application.

Description

technical field [0001] The invention belongs to the field of positive electrode materials for lithium ion batteries, and in particular relates to a rare earth oxide-coated and modified ternary positive electrode material for lithium ion batteries and a preparation method thereof. Background technique [0002] Lithium-ion batteries have been widely used in many fields such as portable electronic devices, electric vehicles, and large-scale energy storage power stations, and are closely related to people's lives. However, with the development of society and economy, the energy density and cycle life of current lithium-ion batteries have gradually failed to meet the growing needs of the people, which is mainly limited by the bottleneck problem of lithium-ion battery cathode materials. Currently the most widely used cathode material for lithium-ion batteries is the lithium layered oxide ternary cathode material (LiNi x co y mn 1-x-y o 2 ), compared with other cathode material...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/485H01M4/505H01M4/525H01M4/62H01M4/628H01M10/0525Y02E60/10
Inventor 程勇申亚斌尹东明梁飞王春丽王立民
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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