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Co-precipitation synthesis method for Na2/3Ni1/3Mn2/3O2 as electrode material and preparation method of Na2/3Ni1/3Mn2/3O2 electrode

A technology of sodium nickel manganate and synthesis method, which is applied in the direction of manganate/permanganate, battery electrodes, nickel compounds, etc., can solve the problems of high cost, toxicity, poor safety, etc., and achieve low impedance, low cost, The effect of a small potential drop

Inactive Publication Date: 2014-07-16
三亚哈尔滨工程大学南海创新发展基地
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Organic electrolytes have the disadvantages of high cost, poor safety, and toxicity

Method used

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  • Co-precipitation synthesis method for Na2/3Ni1/3Mn2/3O2 as electrode material and preparation method of Na2/3Ni1/3Mn2/3O2 electrode
  • Co-precipitation synthesis method for Na2/3Ni1/3Mn2/3O2 as electrode material and preparation method of Na2/3Ni1/3Mn2/3O2 electrode
  • Co-precipitation synthesis method for Na2/3Ni1/3Mn2/3O2 as electrode material and preparation method of Na2/3Ni1/3Mn2/3O2 electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) NiSO 4 , MnSO 4 According to the nickel-manganese ratio of 0.8:1, the solutions are mixed with each other and stirred vigorously, and at the same time, the complexing agent concentrated ammonia water is added for complexation until the pH value is 8.5;

[0032] (2) Add 2mol / L NaOH solution to adjust the pH value to 11 for precipitation, and the obtained precipitate is filtered, washed and dried;

[0033] (3) Combine the dried product with the stoichiometric ratio of Na 2 CO 3 Perform ball milling and mixing for 5 hours;

[0034] (4) Put the ball-milled mixture into a muffle furnace for pretreatment at 400°C for 6h and high-temperature calcination at 800°C for 24h to obtain the final product.

[0035] It can be seen from the XRD diagram that curve 1 corresponds to the standard card one by one, the characteristic peaks are sharp, and there are no obvious impurity peaks, indicating that Na 2 / 3 Ni 1 / 3 mn 2 / 3 o 2 The crystallinity is intact and the purity is high...

Embodiment 2

[0037] Example 1 (3) was changed to ball milling and mixing the dried product with stoichiometric NaOH for 5 hours. The rest of the synthesis conditions remain unchanged.

Embodiment 3

[0039] Example 1 (4) was changed to put the ball-milled mixture into a muffle furnace for pretreatment at 400° C. for 6 hours and high-temperature calcination at 750° C. for 24 hours to obtain the final product. The rest of the synthesis conditions remain unchanged.

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Abstract

The invention provides a co-precipitation synthesis method for Na2 / 3Ni1 / 3Mn2 / 3O2 as an electrode material and a preparation method of a Na2 / 3Ni1 / 3Mn2 / 3O2 electrode. The co-precipitation synthesis method comprises the steps of (1) mixing a nickel source compound solution and a manganese source compound solution, then, violently stirring to prepare a mixed solution with the nickel-to-manganese molar ratio of (0.8-1.5):1, and meanwhile, adding a complexing agent to complex until the pH value of the solution is up to 7.5-8.5; (2) adding a precipitant for precipitating to obtain a precipitate, carrying out suction filtration on the obtained precipitate, washing and drying; (3) carrying out ball milling on the dried product and a sodium source compound with a stoichiometric ratio, and mixing for 3-10h; (4) placing the ball-milled mixture into a muffle furnace to pretreat and calcine at high temperature to obtain a final product, namely, Na2 / 3Ni1 / 3Mn2 / 3O2. Proved by an electrochemical test, the material provided by the invention has the specific discharge capacities of 195mAh / g (0.01C), 153mAh / g (0.05C), 84mAh / g (0.10C), 53mAh / g (0.20C) and 49mAh / g (0.50C) in a rate performance test. The co-precipitation synthesis method is wide in raw material source, easy to prepare, low in aqueous sodium ion electrolyte cost and friendly to environment.

Description

technical field [0001] The present invention relates to a method for preparing a positive electrode material for a battery, in particular to a positive electrode material sodium nickel manganate Na 2 / 3 Ni 1 / 3 mn 2 / 3 o 2 Co-precipitation synthesis method. The present invention also relates to a method for preparing an electrode comprising the battery cathode material of the present invention. Background technique [0002] Today's world is facing increasingly serious energy crisis and environmental problems. Therefore, the conversion and storage of clean renewable energy (such as: solar energy, wind energy, tidal energy, etc.) and electricity has become an important issue in today's world. Among existing batteries, lithium-ion batteries have been successfully commercialized in the field of portable electronics due to their high energy density. However, with the development of lithium-ion battery technology, the large demand for metal lithium is in conflict with the curren...

Claims

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Application Information

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IPC IPC(8): C01G53/00C01G45/12H01M4/505H01M4/525
CPCY02E60/10
Inventor 曹殿学张莹姜雪史楠楠刘佳王贵领
Owner 三亚哈尔滨工程大学南海创新发展基地
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