Sodium-rich cathode material of sodium ion battery, preparation method of sodium-rich cathode material and sodium ion battery

A sodium-ion battery, cathode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor cycle stability, low discharge specific capacity, etc., to improve discharge specific capacity, simplify reaction operations, and improve electrochemical performance. performance effect

Inactive Publication Date: 2016-01-06
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Claims
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Problems solved by technology

[0006] The purpose of the present invention is to solve the defects of low discharge specific capacity and poor cycle stability of existing sodium-ion battery positive electrode materials, to provide a sodium-rich positive electrode material for a sodium-ion battery and a preparation method thereof and a sodium-ion battery , the sodium-rich cathode material for sodium-ion batteries can realize high-capacity charge and discharge of sodium-ion batteries, and make sodium-ion batteries have excellent cycle stability

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  • Sodium-rich cathode material of sodium ion battery, preparation method of sodium-rich cathode material and sodium ion battery

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preparation example Construction

[0020] In a first aspect, the present invention provides a method for preparing a sodium-rich cathode material for a sodium-ion battery, the method comprising the following steps:

[0021] (1) Under stirring, the nickel salt solution, cobalt salt solution, manganese salt solution, oxalate solution and sodium salt solution are mixed, and the conditions of the mixing are such that Ni in the mixed solution 2+ , Co 2+ , Mn 2+ and Na + The ratio of the total moles of oxalate ions to the moles of oxalate ions is 0.8 to 1:1, preferably 1:1;

[0022] (2) in a sealed environment, the above-mentioned mixed solution is subjected to a hydrothermal reaction, followed by cooling, solid-liquid separation, washing, and drying to obtain a precursor;

[0023] (3) calcining the precursor in an air atmosphere to obtain a sodium-rich cathode material for a sodium-ion battery.

[0024] In step (1) of the method of the present invention, the mixing temperature is not particularly limited, and it...

Embodiment 1

[0052] This example is used to illustrate the sodium-rich cathode material for sodium ion battery of the present invention and the preparation method thereof.

[0053] At 25°C, a mixture of 0.35g nickel acetate, 0.34g cobalt acetate and 1.87g manganese acetate (that is, the molar ratio of nickel ion, cobalt ion and manganese ion is 0.18:0.18:1) was dissolved in 50ml deionized water, stirred , to obtain a homogeneous solution 1; dissolve a mixture of 1.94 g of sodium acetate and 3.45 g of oxalic acid (that is, the molar ratio of sodium ions and oxalate is 0.62:1) in 50 ml of deionized water, and stir to obtain a homogeneous solution 2; The solution 1 and solution 2 were dropped into the constantly stirring reactor, the reactor was sealed after thorough mixing, and the hydrothermal reaction was carried out in an oven at 180 °C for 6 h, then cooled to 30 °C, and filtered to obtain a precipitate. Washed with deionized water for 3 times, dried at 60 °C for 300 min to obtain the pre...

Embodiment 2

[0057] This example is used to illustrate the sodium-rich cathode material for sodium ion battery of the present invention and the preparation method thereof.

[0058]At 25°C, a mixture of 0.3g nickel nitrate, 0.3g cobalt nitrate and 0.88g manganese nitrate (that is, the molar ratio of nickel ion, cobalt ion and manganese ion is 0.33:0.33:1) was dissolved in 50ml of deionized water and stirred. , to obtain a homogeneous solution 1; dissolve the mixture of 0.94g of sodium nitrate and 3.19g of potassium oxalate (that is, the molar ratio of sodium ions and oxalate is 0.58:1) in 50ml of deionized water, and stir to obtain a homogeneous solution 2; The obtained solution 1 and solution 2 were dropped into a continuously stirring reactor, and the reactor was sealed after being fully mixed, and the hydrothermal reaction was carried out in an oven at 120 ° C for 18 h, and then cooled to 30 ° C, and filtered to obtain a precipitate. The precipitate was washed three times with absolute e...

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Abstract

The invention discloses a sodium-rich cathode material of a sodium ion battery, a preparation method of the sodium-rich cathode material and the sodium ion battery. The method comprises the following steps of: (1) mixing a nickel salt solution, a cobalt salt solution, a manganese salt solution, an oxalate solution and a sodium salt solution under stirring, wherein in a mixing condition, the ratio of the total mole number of Ni<2+>, Co<2+>, Mn<2+> and Na<+> in the mixed solution to the mole number of oxalate ions is (0.8-1):1; (2) carrying out hydrothermal reaction on the mixed solution in a sealed environment, and then carrying out cooling, solid-liquid separation, washing and drying to obtain a precursor; and (3) calcining the precursor in an air atmosphere to obtain the sodium-rich cathode material of the sodium ion battery. By means of the sodium-rich cathode material of the sodium ion battery, obtained according to the preparation method, high-capacity charging and discharging of the sodium ion battery can be achieved, and moreover, the sodium ion battery has excellent cycling stability.

Description

technical field [0001] The invention relates to the field of chemical power supply material preparation and sodium ion battery positive electrode material, in particular to a sodium ion battery rich sodium positive electrode material and a preparation method thereof and a sodium ion battery. Background technique [0002] In today's society, energy is an important material basis for the survival and development of human society. With the rapid development of social economy, human's demand for energy will continue to increase. At present, traditional fossil energy such as coal, oil, natural gas, etc. are still the main energy sources used by human society, but the reserves of such fossil energy are decreasing day by day, and it has brought about increasingly serious environmental pollution problems. All countries are looking for new environmentally friendly energy sources. energy. [0003] Although renewable energy sources such as wind energy and solar energy are environmenta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M10/054
CPCY02E60/10
Inventor 吴伯荣吴川穆道斌蔡昊张琳静吴锋陈实
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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