Preparation method of rare-earth samarium modified ternary anode material

A positive electrode material, rare earth technology, applied in the field of new energy materials, to achieve the effect of improving electrochemical performance, excellent electrochemical performance, and simple process

Active Publication Date: 2014-03-19
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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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are few studies on the doping modification of rare earth elements in nickel-cobalt-manganese ternary cathode materials, especially the doping of rare earth elements Sm has not been reported.

Method used

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  • Preparation method of rare-earth samarium modified ternary anode material
  • Preparation method of rare-earth samarium modified ternary anode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Step (1) preparation of feed liquid: 0.2molNiSO 4 ·6H 2 O, 0.12molCoSO 4 ·7H 2 O, 0.08molMnSO 4 ·H 2 O mixed, add 400mL deionized water at room temperature to prepare a ternary ion mixture. Add 120mL of 25% ammonia water to 300mL of 4mol / L NaOH solution to form 420mL ammonia water-NaOH mixed solution.

[0030] Step (2) Co-precipitation reaction: At 20°C, evenly pour 420mL of ammonia water-NaOH mixture into the ternary mixture solution stirred at a constant speed at a flow rate of 5mL / min. After the mixed lye is added completely, seal the reaction vessel. And the stirring reaction was continued at 20°C for 2h.

[0031] Step (3) Filtration and drying: After the above reaction is completed, perform solid-liquid separation and wash with deionized water until BaCl 2 Detect the absence of SO in the wash filtrate 4 2- , the filtrate was placed in a vacuum oven and dried at 90° C. for 5 h.

[0032] Step (4) Adding samarium, distributing lithium, and high-temperature s...

Embodiment 2

[0034]Step (1) preparation of feed liquid: 0.32molNiCl 2 ·6H 2 O, 0.192mol CoCl 2 ·6H 2 O, 0.128molMnCl 2 4H 2 O mixed, and 600mL deionized water was added at room temperature to prepare a ternary ion mixture. Add 100mL of 25% ammonia water to 400mL of 6mol / L NaOH solution to form 500mL ammonia water-NaOH mixed solution.

[0035] Step (2) Co-precipitation reaction: At 55°C, add 500mL of ammonia water-NaOH mixture evenly at a flow rate of 1mL / min to the ternary mixture solution stirred at a constant speed. After the mixed lye is added completely, seal the reaction vessel. And the stirring reaction was continued at 55°C for 4h.

[0036] Step (3) Filtration and drying: After the above reaction is completed, the solid-liquid separation is carried out, and the AgNO is washed with deionized water. 3 Detection of the absence of Cl in the wash filtrate - , the filtrate was placed in a vacuum oven and dried at 70°C for 12h.

[0037] Step (4) Adding samarium, distributing lithi...

Embodiment 3

[0039] Step (1) preparation of feed liquid: 0.2molNi(NO 3 ) 2 ·6H 2 O, 0.12molCo(NO 3 ) 2 ·6H 2 O, 0.08molMn(NO 3 ) 2 (50% solution) were mixed, and 300mL deionized water was added at room temperature to prepare a ternary ion mixture. Add 150mL of 25% ammonia water to 550mL of 1mol / L NaOH solution to form 700mL ammonia water-NaOH mixed solution.

[0040] Step (2) Co-precipitation reaction: At 60°C, evenly pour 700mL of ammonia water-NaOH mixed solution into the ternary mixed material solution stirred at a constant speed at a flow rate of 100mL / min. After the mixed lye is added completely, seal the reaction vessel. And the stirring reaction was continued at 60° C. for 1 h.

[0041] Step (3) Filtration and drying: After the above reaction is completed, solid-liquid separation is carried out, washed with deionized water until neutral, and the filtrate is placed in a vacuum oven and dried at 90°C for 2 hours.

[0042] Step (4) Adding samarium, distributing lithium, and h...

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Abstract

The invention relates to a preparation method of a rare-earth samarium modified ternary anode material, in particular to a method of a rare-earth samarium modified LiNixCoyMn[1-x-y]O2 (x=0.5, y=0.2 or 0.3) ternary anode material. The method is characterized by comprising the following steps of (1) preparing a ternary nickel, cobalt, manganese salt aqueous solution and a soluble alkaline or mixed alkaline solution; (2) adding the soluble alkaline or mixed alkaline solution into the ternary nickel, cobalt and manganese salt aqueous solution at a given flow rate, and heating and stirring a mixture; (3) filtering, washing and vacuum-drying the coprecipitate; (4) mixing the dried coprecipitate with samarium compound and lithium salt, grinding the mixture, placing the mixture in a sintering furnace, and carrying out high-temperature solid-phase reaction so as to obtain the rear-earth samarium modified LiNixCoyMn[1-x-y]O2 (x=0.5, y=0.2 or 0.3) ternary anode material. The primary charging-discharging efficiency of the ternary anode material which is prepared by doping the rare-earth samarium in a modifying manner exceeds 90 percent, the 0.2C discharging capacity can reach more than 159mAh / g, and the cycling performance is good.

Description

technical field [0001] The invention belongs to the technical field of new energy materials and relates to a rare earth samarium modified LiNi 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] As a new generation of environmentally friendly and high-energy batteries, lithium-ion batteries have become one of the key points in the development of the battery industry. At present, LiCoO is the main cathode material for lithium-ion batteries that has been studied more. 2 , LiNiO 2 , LiMn 2 o 4 、LiFePO 4 etc., all have their own deficiencies and defects. Researchers have been working on the research of a new generation of lithium-ion battery materials. [0003] Regardless of the price of raw materials, the electrochemical performance of the material, the safety performance of the material and the friendliness to the environment, the nickel-cobalt-manganese ternary cathode material has good advantages. The ter...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525
CPCY02E60/122H01M4/362H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 姚文俐刘宜强李安运孙仙源
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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