A ternary cathode material coated with double oxides and a preparation method thereof

A cathode material and double oxide technology, which is applied in the field of double oxide-coated ternary cathode materials and its preparation, can solve problems such as uneven distribution, and achieve the effects of simple process, improved cycle and rate performance, and low cost

Inactive Publication Date: 2018-12-18
TIANNENG SAFT ENERGY JOINT CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a method for preparing a double oxide-coated ternary positi

Method used

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  • A ternary cathode material coated with double oxides and a preparation method thereof
  • A ternary cathode material coated with double oxides and a preparation method thereof
  • A ternary cathode material coated with double oxides and a preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A preparation method of double oxide coated nickel-cobalt-manganese ternary cathode material:

[0042] (1) 3g nickel cobalt manganese ternary cathode material Li (Ni 0.6 Co 0.2 Mn 0.2 )O 2 Disperse in 50mL of anhydrous methanol and ultrasonic for 30min, then stir to obtain a turbid liquid;

[0043] (2) Disperse 93.09 mg of tetrabutyl titanate and 34.70 mg of tetrabutyl orthosilicate TEOS in 10 mL of anhydrous methanol and ultrasonically disperse them uniformly to obtain a dispersion;

[0044] (3) Pour the dispersion obtained in step (2) into the turbid liquid obtained in step (1), heat and stir at 70°C, rotate at 700r / min, and react for 2h. During this process, slowly add the stoichiometric ratio Deionized water. Then raise the temperature to heat and evaporate, take out the material and dry it for later use;

[0045] (4) Put the precursor of the coating material obtained in step (3) into a muffle furnace at 400°C for 3h and 5°C / min to obtain the final silicon oxide and titani...

Embodiment 2

[0054] A preparation method of double oxide coated nickel-cobalt-manganese ternary cathode material:

[0055] (1) 3g nickel cobalt manganese ternary cathode material Li (Ni 0.4 Co 0.4 Mn 0.2 )O 2 Disperse in 30mL absolute ethanol and ultrasonic for 30min, then stir to obtain a turbid liquid;

[0056] (2) Disperse 32.1 mg of butenyl titanate and 26.03 mg of TEOS in 30 mL of absolute ethanol and ultrasonically disperse them uniformly to obtain a dispersion;

[0057] (3) Pour the dispersion obtained in step (2) into the turbid liquid obtained in step (1), heat and stir at 50°C, rotate at 1000r / min, and react for 5h. During this process, slowly drop in the stoichiometric ratio The deionized water is heated to dry at an elevated temperature, and the material is taken out and dried for later use;

[0058] (4) Put the coating material precursor obtained in step (3) into a muffle furnace for calcination at 300°C for 10 hours at 1°C / min. The final double oxide coated nickel-cobalt-manganese t...

Embodiment 3

[0066] A preparation method of double oxide coated nickel-cobalt-manganese ternary cathode material:

[0067] (1) 3g nickel cobalt manganese ternary cathode material Li (Ni 0.5 Co 0.2 Mn 0.3 )O 2 Disperse in 100 mL of absolute ethanol and ultrasonic for 30 minutes, then stir to obtain a turbid liquid;

[0068] (2) Disperse 85.08 mg of butenyl titanate and 138.89 mg of TEOS in 10 mL of absolute ethanol and ultrasonically disperse them uniformly to obtain a dispersion;

[0069] (3) Pour the dispersion obtained in step (2) into the turbid liquid obtained in step (1), heat and stir at 120°C, rotate at 1000r / min, and react for 2h. During this process, slowly drop in the stoichiometric ratio Deionized water. Then raise the temperature to heat and evaporate, take out the material and dry it for later use;

[0070] (4) Put the coating material precursor obtained in step (3) into a muffle furnace at 800°C for 2h and 10°C / min. The final double oxide coated nickel-cobalt-manganese ternary cath...

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Abstract

The invention discloses a ternary cathode material coated with double oxides and a preparation method thereof, belonging to the technical field of lithium ion batteries. The preparation method comprises the following steps: (1) adding a ternary cathode material into an organic solvent, and performing ultrasonic dispersing to obtain a first dispersion liquid; (2) adding a titanium source and a silicon source into the same organic solvent as the Step (1), and performing ultrasonically dispersing to obtain a second dispersion liquid; 3) uniformly mixing the first dispersion liquid and the seconddispersion liquid, dropwise adding water according to a stoichiometric ratio, stirring and reacting, and evaporating all the solvents to dryness to obtain a composite material precursor; (4) calcinating the composite material precursor to obtain the ternary cathode material coated with double oxides. The different film-forming rates of silicon oxide and titanium oxide during calcination at high temperature ensure the uniform distribution of the final coating layer of the whole. The two oxides jointly form the coating together, which has the effect of 1+1 > 2 on the coating of the cathode material, not only is the cycling stability of the material improved, but also the rate performance of the material is improved.

Description

Technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a double oxide coated ternary positive electrode material and a preparation method thereof. Background technique [0002] With the increasingly prominent problems of energy crisis and environmental pollution, the development of sustainable new energy sources and the construction of a low-carbon society have become a top priority. Lithium-ion batteries have attracted much attention as a new type of high-energy green battery. Layered nickel-cobalt-manganese ternary cathode material is a kind of material with great development prospects, and LiCoO 2 , LiNiO 2 , LiMnO 2 In comparison, it has the advantages of low cost, large capacity, good cycle performance, good thermal stability, and relatively stable structure. [0003] Although the nickel-cobalt-manganese ternary cathode material has many advantages, it still has certain problems. For example, the electrolyte has a certai...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/62H01M4/628H01M10/0525Y02E60/10
Inventor 孙伟霍峰蔚赵海敏郭少华李盛向德波何文祥周翠芳郭鑫李福林
Owner TIANNENG SAFT ENERGY JOINT CO
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