Doped silicate sodium ion battery positive electrode material and preparation method thereof

A sodium ion battery and positive electrode material technology, applied in the direction of silicate, battery electrode, alkali metal silicate, etc., can solve the problems that cannot meet the requirements of commercial energy storage batteries, and achieve the improvement of electronic conductivity and sodium ion migration rate , The preparation method is simple, the effect of long cycle life

Inactive Publication Date: 2016-08-03
NINGBO POLYTECHNIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although anode materials for sodium-ion batteries have been greatly developed in recent years, they still cannot meet the requirements of commercial energy storage batteries in terms of energy density and cycle life.

Method used

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  • Doped silicate sodium ion battery positive electrode material and preparation method thereof
  • Doped silicate sodium ion battery positive electrode material and preparation method thereof
  • Doped silicate sodium ion battery positive electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A preparation method of a sodium ion battery cathode material, comprising the following steps:

[0033] Accurately weigh 0.98 mol sodium oxalate, 0.02 mol magnesium oxalate, 1.0 mol ferrous oxalate, 1.0 mol tetraethyl orthosilicate, put them into a ball mill jar, then use an appropriate amount of deionized water as a mixing medium, and use a ball mill to fully mill for 2 hours , after drying at 110°C, the powder was pre-fired at 400°C for 4 hours under the protection of high-purity nitrogen at a heating rate of 5°C / min, and the pre-fired powder was dispersed with polyethylene glycol by mass Mix at a ratio of 1:0.2, add an appropriate amount of deionized water, adjust to a rheological state, and obtain a rheological phase precursor. The precursor was heated to 650°C at a heating rate of 5°C / min under the protection of high-purity nitrogen, and sintered for 8 hours to obtain a magnesium-doped silicate sodium-ion battery cathode material Na 1.96 Mg 0.02 FeSiO 4 .

[00...

Embodiment 2

[0038]Accurately weigh 1.94mol of sodium bicarbonate, 0.03mol of magnesium acetate, 1.0mol of ferric citrate, and 1.0mol of tetraethyl orthosilicate, put them into a ball mill jar, then use an appropriate amount of deionized water as a mixing medium, and use a ball mill to fully mill for 3 Hours, after drying at 120°C, the powder was pre-fired at 350°C for 4 hours under the protection of high-purity nitrogen at a rate of 3°C / min, and the pre-fired powder was dispersed with glucose at a mass ratio of : Mix at a ratio of 0.3, add an appropriate amount of deionized water, adjust to a rheological state, and obtain a rheological phase precursor. The precursor was heated to 700°C at a heating rate of 3°C / min under the protection of high-purity nitrogen, and sintered for 5 hours to obtain a magnesium-doped silicate sodium-ion battery cathode material Na 1.94 Mg 0.03 FeSiO 4 .

[0039] Performance Testing:

[0040] The prepared sodium ion battery cathode material Na 1.94 Mg 0.03...

Embodiment 3

[0042] Accurately weigh 1.98mol of sodium acetate, 0.01mol of magnesium hydroxide, 1.0mol of ferrous acetate, and 1.0mol of silicon dioxide, put them into a ball mill jar, then use an appropriate amount of deionized water as a mixing medium, and use a ball mill to fully mill for 4 hours. After drying at 105°C, the powder is pre-fired at 450°C for 2 hours at a heating rate of 6°C / min under the protection of high-purity nitrogen, and the pre-fired powder is dispersed with citric acid at a mass ratio of 1:0.5 Mixed in a certain ratio, adding an appropriate amount of deionized water, adjusted to a rheological state, and obtained a rheological phase precursor. The precursor was heated to 750°C at a heating rate of 6°C / min under the protection of high-purity nitrogen, and sintered for 4 hours to obtain a magnesium-doped silicate sodium-ion battery cathode material Na 1.98 Mg 0.01 FeSiO 4 .

[0043] The prepared sodium ion battery cathode material Na 1.98 Mg 0.01 FeSiO 4 Mix ev...

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Abstract

The invention relates to a doped silicate sodium ion battery positive electrode material and a preparation method thereof, and belongs to the field of chargeable battery positive electrode materials in energy materials. The formula of the positive electrode material is Na<2(1-x)>Mg<x>FeSiO4; x=0-0.05. The preparation method comprises the following steps: precisely weighing a sodium source compound, a magnesium source compound, an iron source compound, and a silicic acid radical source compound according to a mole ratio of Na:Mg:Fe:SiO4<2->=2(1-x):x:1:1; adding a proper amount of deionized water, evenly mixing the raw materials through ball milling, pre-burning the mixture in inert gas, grinding the obtained solid after pre-burning, then mixing the powder with a carbon source compound, adding a proper amount of deionized water to form a rheology state so as to obtain a rheology precursor; and finally burning the precursor in an inert atmosphere to obtain magnesium doped sodium silicate battery positive electrode material (Na<2(1-x)>Mg<x>FeSiO4). The positive material has a good cycle performance, and has a wide application prospect as a novel sodium ion battery positive electrode material.

Description

technical field [0001] The invention belongs to the field of anode materials for sodium ion batteries, in particular to a doped silicate sodium ion battery anode material Na 2(1-x) Mg x FeSiO 4 and its preparation method. Background technique [0002] Due to the characteristics of high voltage, large capacity, long life and good safety performance, lithium-ion batteries have shown broad application prospects from portable electronic devices, energy storage batteries to electric vehicles. With the successful application of lithium-ion batteries on a global scale, the demand for lithium resources has greatly increased, and the reserves of lithium in the earth's crust are limited, even without considering the large-scale application requirements of lithium-ion batteries in the fields of electric vehicles and energy storage in the future , it is estimated that the demand for lithium resources will increase by 5% per year, and the proven exploitable lithium resources can only ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/32H01M4/58H01M10/054
CPCC01B33/32C01P2004/03C01P2004/82C01P2006/40H01M4/5825H01M10/054Y02E60/10
Inventor 袁正勇彭振博
Owner NINGBO POLYTECHNIC
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