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Method for preparing nickel-base ternary cathode material through microwaves

A cathode material, nickel-based technology, applied in the field of new energy materials, to achieve the effect of shortening the process flow, good cycle performance, and low energy consumption

Inactive Publication Date: 2014-08-06
江西省钨与稀土产品质量监督检验中心(江西省钨与稀土研究院)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the deficiencies in the preparation of existing ternary cathode materials, the present invention provides a method for preparing nickel-based LiNi by microwave synthesis, drying and sintering. x co y mn 1-x-y o 2 (X=0.5, Y=0.2 or 0.3) method of ternary cathode material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Add 0.04molNiSO 4 ·6H 2 O, 0.024molCoSO 4 ·7H 2 O, 0.016molMnSO 4 ·H 2 O was dissolved in 80ml of a mixture of deionized water and isopropanol, wherein isopropanol accounted for 10% of the volume of the mixture. Stir at room temperature until completely dissolved to prepare a ternary mixed solution of 1 mol / L. After dissolution, the molar ratio of Ni:Co:Mn is 5:3:2.

[0023] (2) Add 0.088mol of (NH 4 ) 2 CO 3 Dissolve in 160ml of a mixture of deionized water and isopropanol, wherein isopropanol accounts for 10% of the volume of the mixture. Stir at 30°C until completely dissolved to prepare a 0.55mol / L ammonium carbonate solution, and seal the container holding the ammonium carbonate solution to reduce the evaporation of water.

[0024] (3) After the above-mentioned heated ammonium carbonate solution is completely dissolved, quickly pour it into the ternary mixture, heat at 60°C with microwave and stir for 40 minutes.

[0025] (4) After aging the above-men...

Embodiment 2

[0028] (1) Add 0.06molNi(NO 3 ) 2 ·6H 2 O, 0.036molCo(NO 3 ) 2 ·6H 2 O, 0.048molMn(NO 3 ) 2(50% solution) was dissolved in a mixture of 60ml of deionized water and absolute ethanol, wherein absolute ethanol accounted for 20% of the volume of the mixture. Stir at room temperature until completely dissolved to prepare a ternary mixed solution of 2 mol / L. After dissolution, the molar ratio of Ni:Co:Mn is 5:3:2.

[0029] (2) Add 0.132mol of Na 2 CO 3 Dissolve in 180 ml of a mixture of deionized water and absolute ethanol, of which absolute ethanol accounts for 20% of the volume of the mixture, heat and stir at 40°C until completely dissolved, prepare a sodium carbonate solution of about 0.7mol / L, and store The container of sodium carbonate solution is tightly closed to reduce the evaporation of water.

[0030] (3) After the above-mentioned heated sodium carbonate solution is completely dissolved, quickly pour the ternary mixture into the sodium carbonate solution, heat w...

Embodiment 3

[0034] (1) Add 0.05molNiCl 2 ·6H 2 O, 0.03mol CoCl 2 ·6H 2 O, 0.02molMnCl 2 4H 2 O was dissolved in a mixture of 200ml of deionized water and ethylene glycol, wherein ethylene glycol accounted for 5% of the volume of the mixture. Stir at room temperature until completely dissolved to prepare a 0.5mol / L ternary mixed solution. After dissolution, the molar ratio of Ni:Co:Mn is 5:3:2.

[0035] (2) Add 0.11mol of (NH 4 ) 2 CO 3 Dissolve in 55ml of deionized water and ethylene glycol mixture, in which ethylene glycol accounts for 5% of the volume of the mixture, stir at 40°C until completely dissolved to prepare a 2mol / L ammonium carbonate solution, and store the ammonium carbonate solution Keep the container airtight to reduce water evaporation.

[0036] (3) After the above-mentioned heated potassium carbonate solution is completely dissolved, quickly pour it into the ternary mixture liquid, heat at 70°C with microwave and stir for 10 minutes.

[0037] (4) After aging th...

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Abstract

The invention relates to a method for preparing a ternary cathode material through microwave synthesis, drying and sintering. The method is characterized by comprising steps as follows: (1), a ternary mixed liquid of nickel salt, cobalt salt, manganese salt and carbonate water-alcohol is prepared proportionally; (2), a carbonate solution is mixed with the ternary mixed liquid, and the mixture is subjected to microwave heating and stirring; (3), co-precipitate is filtered, washed and subjected to vacuum drying; and (4), the dried co-precipitate and lithium salt are mixed, ground and placed in a chamber type electric resistance furnace or a microwave sintering furnace for a high-temperature solid-phase reaction, and the cathode material adopting a laminated structure LiNixCoyMn<1-x-y>O2 is obtained, wherein x is equal to 0.5, and y is equal to 0.2 or 0.3. The ternary cathode material is prepared and obtained through ternary coprecipitation of carbonate, nickel, cobalt and manganese, microwave synthesis and sintering, the first charge-discharge efficiency is larger than 91%, the discharge capacity is larger than 155 mAh / g at the discharge rate of 0.5 C, and the cycle performance is excellent.

Description

technical field [0001] The invention belongs to the technical field of new energy materials, and relates to the preparation of nickel-based LiNi by microwave synthesis, drying and sintering x co y mn 1-x-y o 2 (X=0.5, Y=0.2 or 0.3) The method of ternary cathode material. Background technique [0002] Lithium-ion batteries have the advantages of small size, light weight, high voltage, high specific capacity, long cycle life, no memory effect, small self-discharge and low pollution. Since the 1990s, commercial lithium-ion batteries have been widely used in Portable products such as mobile phones, digital cameras, and notebook computers, as well as medical equipment, automobiles, and aerospace fields. In recent years, with the general reduction in the price of electronic products, the consumption of lithium-ion batteries has increased sharply. At present, my country is the world's largest producer, consumer and exporter of lithium batteries. [0003] As a new type of batte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525
CPCY02E60/122H01M4/505H01M4/525Y02E60/10
Inventor 姚文俐卢博
Owner 江西省钨与稀土产品质量监督检验中心(江西省钨与稀土研究院)
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