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Cation-doped and modified ternary positive electrode material for lithium ion battery and preparation method of positive ion doped and modified ternary positive electrode material

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, active material electrodes, positive electrodes, etc., can solve the problems of high energy consumption, complicated operation process, uneven distribution of doping elements, etc., and achieve low energy consumption, suitable for Promote the application, the effect of simple operation

Inactive Publication Date: 2021-09-17
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Claims
  • Application Information

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Problems solved by technology

However, it has been noticed that their ion doping methods have problems such as the use of organic salts, uneven distribution of doping elements, complex operating procedures, and high energy consumption.

Method used

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  • Cation-doped and modified ternary positive electrode material for lithium ion battery and preparation method of positive ion doped and modified ternary positive electrode material
  • Cation-doped and modified ternary positive electrode material for lithium ion battery and preparation method of positive ion doped and modified ternary positive electrode material
  • Cation-doped and modified ternary positive electrode material for lithium ion battery and preparation method of positive ion doped and modified ternary positive electrode material

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preparation example Construction

[0033] The present invention also provides a method for preparing a cation-doped modified lithium-ion battery ternary positive electrode material, comprising the following steps:

[0034] Step 1: Uniformly disperse the nano-metal oxide particles in an appropriate amount of solvent to obtain a mixed solution. The solvent is preferably absolute ethanol, ethylene glycol, or distilled water. The uniform dispersion is not particularly limited. method, preferably ultrasonic dispersion, mechanical stirring or physical shaking;

[0035] Step 2: Add ternary material precursor powder to the above mixed solution, stir and mix evenly, to obtain a viscous slurry of ternary material precursor coated with nano-oxide. The ternary material precursor is Ni x co y mn z (OH) 2 or Ni x co y Al z (OH) 2 (x+y+z=1) secondary sphere or single crystal material precursor; the molar ratio range of the nanometer metal oxide to the transition metal of the ternary material precursor is preferably 0....

Embodiment 1

[0041] 1) 87.5 mg of commercially available TiO with a particle size of 50 nm 2 The particles were placed in 2ml of absolute ethanol and dispersed by ultrasonic for 10min to obtain uniformly dispersed TiO 2 ethanol dispersion.

[0042] 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 minutes at a speed of 3000 rpm / min by a homogenizer to obtain nano-TiO 2 Uniformly coated precursor viscous slurry. This addition amount is equivalent to the doping amount of Ti in the ternary material transition metal being 2% mol.

[0043] 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 kept at 800...

Embodiment 2

[0046] Concrete steps and reaction conditions are identical with embodiment 1, and difference is, in step 1 nano-TiO 2 The addition amount of Ti is 44 mg, which is equivalent to the doping amount of Ti in the ternary material transition metal being 1% mol.

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Abstract

The invention discloses a cation-doped and modified ternary positive electrode material for a lithium ion battery and a preparation method of the ternary positive electrode material, and relates to the technical field of positive electrode materials for lithium ion batteries. The cation-doped and modified ternary positive electrode material is obtained by uniformly mixing nanoscale metal oxide particles with a ternary material precursor and lithium salt and then roasting at high temperature. The invention also discloses a preparation method of the cation-doped and modified ternary positive electrode material for the lithium ion battery, which comprises the following steps: stirring and mixing the nano-scale metal oxide and the ternary positive electrode material precursor in a solvent to obtain a precursor material uniformly coated with the nano-scale metal oxide; and drying, uniformly mixing with a lithium salt, and roasting to obtain the modified ternary positive electrode material with uniformly doped cations. The ternary positive electrode material obtained by the method shows more excellent cycling stability and rate capability than those of an undoped modified material under the high voltage of 4.5 V, plays an important role in inhibiting cation mixing, collapse of a layered structure and lattice oxygen release, and can greatly improve the electrochemical performance of the material.

Description

technical field [0001] The invention relates to the field of positive electrode materials for lithium ion batteries, in particular to a ternary positive electrode material for lithium ion batteries modified by cation doping and a preparation method thereof. Background technique [0002] Lithium-ion batteries have been widely used in portable electronic devices, electric vehicles, and large-scale energy storage. However, with the development of society and economy, people's demand for lithium-ion batteries with higher energy density and longer cycle life is increasing. At present, commercial lithium-ion batteries often use graphite as the negative electrode, and the capacity and cycle stability have already shown good performance. The key to solving the current problem is to obtain a positive electrode material with high output specific capacity and good cycle stability. Lithium layered oxide ternary cathode material (LiNi x co y mn z o 2 , x+y+z=1) has been widely resea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M10/0525H01M4/62
CPCH01M4/505H01M4/525H01M10/0525H01M4/628H01M2004/028Y02E60/10
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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