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O3 type sodium ion battery cathode material and preparation method thereof

A technology for sodium ion batteries and cathode materials, applied in battery electrodes, secondary batteries, chemical instruments and methods, etc., can solve the problems of low reversible capacity and cycle performance, and achieve great application value, good cycle stability, and production efficiency. high effect

Inactive Publication Date: 2019-06-11
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Therefore, it is necessary to modify the cathode material of Na-ion battery with O3 phase structure to solve the problem of low reversible capacity and cycle performance when the cut-off voltage is higher than 4.0V.

Method used

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  • O3 type sodium ion battery cathode material and preparation method thereof
  • O3 type sodium ion battery cathode material and preparation method thereof
  • O3 type sodium ion battery cathode material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Prepare NiCl with a total metal ion concentration of 0.5mol / L 2 ·6H 2 O, MnCl 2 4H 2 O, FeCl 3 ·6H 2 O and AlCl 3 ·6H 2 O mixed solution is used as the spray pyrolysis precursor solution, wherein the ratio of the amount of each metal element is Ni:Mn:Fe:Al=(1 / 3:1 / 3:1 / 3) 0.95 : 0.05. The resulting solution was ultrasonically atomized and pyrolyzed at a temperature of 800 °C with a carrier gas (O 2 ) flow rate is 5L / min, collect the metal oxide powder material after pyrolysis, the SEM spectrum of this material is as follows figure 1 shown. Depend on figure 1 It can be seen that the obtained (Ni 1 / 3 mn 1 / 3 Fe 1 / 3 ) 0.95 al 0.05 o 2 It is a micron-sized spherical particle with a particle diameter of 1-4 μm and uniform distribution. Weigh the oxide precursor (Ni 1 / 3 mn 1 / 3 Fe 1 / 3 ) 0.95 al 0.05 o 2 Mix and grind with anhydrous sodium carbonate according to the total metal molar to sodium molar ratio of 1:1.05 (Na excess coefficient is 5%), use a mold t...

Embodiment 2

[0035] Prepare Ni(NO 3 ) 2 ·6H 2 O, Mn(NO 3 ) 2 ·H 2 O, Fe(NO 3 ) 3 9H 2 O and Al(NO 3 ) 3 9H 2 O mixed solution is used as spray pyrolysis precursor solution, wherein the ratio of the amount of each metal element substance is Ni:Mn:Fe:Al=(2 / 5:1 / 2:1 / 10) 0.8 : 0.2. The resulting solution was ultrasonically atomized and pyrolyzed at a temperature of 800 °C with a carrier gas (O 2 ) with a flow rate of 5 L / min to collect the pyrolyzed metal oxide powder material. Weigh the oxide precursor (Ni 1 / 10 mn 1 / 2 Fe 2 / 5 ) 0.8 al 0.2 o 2 Mix and grind with anhydrous sodium carbonate according to the total metal molar to sodium molar ratio of 1:1.05 (Na excess coefficient is 5%), use a mold to press the powder into a disc with a diameter of 12mm under a pressure of 20MPa, and place it on a corundum burner in a boat, placed in a tube furnace at O 2 Under the atmosphere, calcining at 850°C for 20h at a heating rate of 5°C / min, and cooling to room temperature with the furna...

Embodiment 3

[0038] Prepare NiSO with a total metal ion concentration of 0.5mol / L 4 ·6H 2 O, MnSO 4 4H 2 O, Fe 2 (SO 4 ) 3 9H 2 O and Al 2 (SO 4 ) 3 18H 2 O mixed solution is used as spray pyrolysis precursor solution, wherein the ratio of the amount of each metal element substance is Ni:Mn:Fe:Al=(3 / 5:1 / 5:1 / 5) 0.75 : 0.25. The resulting solution was ultrasonically atomized and pyrolyzed at a temperature of 800 °C with a carrier gas (O 2 ) with a flow rate of 5 L / min, and use a powder collector to collect the pyrolyzed metal oxide powder material. Weigh the oxide precursor (Ni 4 / 5 mn 1 / 10 Fe 1 / 10 ) 0.55 al 0.45 o 2 Mix and grind with anhydrous sodium carbonate according to the total metal molar to sodium molar ratio of 1:1.05 (Na excess coefficient is 5%), use a mold to press the powder into a disc with a diameter of 12mm under a pressure of 20MPa, and place it on a corundum burner in a boat, placed in a tube furnace at O 2 Under the atmosphere, calcining at 1000 °C for ...

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Abstract

The invention provides an O3 type sodium ion battery cathode material and a preparation method thereof. The preparation method comprises the following steps: firstly preparing metal salt of nickel, manganese, iron, and aluminum into a precursor solution; performing spraying pyrolysis on the precursor solution to obtain powder product; and finally uniformly mixing the powder material and the sodiumsalt to perform tabletting and high-temperature sintering to obtain the O3 type sodium ion battery cathode material. The preparation method is simple in operation, high in production efficiency, large in capacity, and strong in adaptability. The manufactured cathode material is a sheet structure, the sheet diameter is 1-5 microns, the thickness is 0.5-0.1 micron, the morphology and particle sizeis uniform, the reversible specific capacity under high voltage is high, the cycling stability is good; the charging / discharging specific capacity is measured in the 2.0-4.2V voltage interval, the first discharging specific capacity is more than 148mAh.g-1, and the coulombic efficiency is more than 92%.

Description

technical field [0001] The invention relates to the field of battery cathode materials, in particular to an O3 type sodium ion battery cathode material and a preparation method thereof. Background technique [0002] In recent years, with the massive consumption of non-renewable energy and environmental pollution, the development of green and sustainable new energy to replace traditional fossil energy has become a global research hotspot. Due to the advantages of high energy density, long cycle life, good safety performance and no memory effect, lithium-ion batteries have been widely used in new energy vehicles, new energy power generation (solar energy, wind energy, etc.) Natural reserves are limited, unevenly distributed, and expensive, which seriously restricts their application in large-scale energy storage devices. Sodium-ion batteries have a similar storage mechanism to lithium-ion batteries. Sodium is rich in resources, widely distributed, and low in cost. Because the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/505H01M4/525H01M10/0525C01G53/00
CPCY02E60/10
Inventor 颜果春马安霞李新海王志兴郭华军尹周澜王接喜胡启阳彭文杰
Owner CENT SOUTH UNIV
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