Sodium-ion battery positive electrode material, preparation method thereof and sodium-ion battery

A sodium-ion battery and cathode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems that cannot be used in sodium batteries, achieve excellent specific capacity and cycle performance, convenient operation, and environmentally friendly operation

Inactive Publication Date: 2018-09-21
东北大学秦皇岛分校
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] However, the above-mentioned scheme has the problem that the positive electrode material specific capacity needs to be further improved, and the stability needs to be further strengthened. CN104409716A and "Concentration gradient positive electrode material LiNi for lithium ion battery 0.643 co 0.055 mn 0.302 o 2 Synthesis and Characterization of the "Synthesis and Characterization" There is still the problem that it cannot be used in sodium batteries

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  • Sodium-ion battery positive electrode material, preparation method thereof and sodium-ion battery
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  • Sodium-ion battery positive electrode material, preparation method thereof and sodium-ion battery

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Embodiment 1

[0076] The present embodiment adopts the following method to prepare the positive electrode material of sodium ion battery:

[0077] (1) Na 2 CO 3 Fully dissolve 0.3mol / L ammonia water in deionized water to obtain an alkaline solution, mix it with a mixed metal salt solution containing nickel salt, cobalt salt and manganese salt, carry out a co-precipitation reaction at 50°C, and add the manganese salt solution dropwise to the co-precipitation reaction In the precipitation reaction system, the pH of the coprecipitation reaction system controlled by the flow rate of the alkali solution is 7.5, and the mol ratio of the nickel element, cobalt element and manganese element in the coprecipitation reaction system is 1.67:1.67:6.7, suction filtration, to The obtained solid is dried and sieved to obtain mixed metal carbonate;

[0078] Wherein, the Na in the alkaline solution 2 CO 3 The solute mass ratio to ammonia water is 13:1, and the nickel salt is NiSO 4 , the cobalt salt is ...

Embodiment 2

[0088] The present embodiment adopts the following method to prepare the positive electrode material of sodium ion battery:

[0089] (1) Na 2 CO 3 Fully dissolve 0.3mol / L ammonia water in deionized water to obtain an alkaline solution, mix it with a mixed metal salt solution containing nickel salt, cobalt salt and manganese salt, carry out a co-precipitation reaction at 50°C, and add the manganese salt solution dropwise to the co-precipitation reaction In the precipitation reaction system, the pH of the coprecipitation reaction system controlled by the flow rate of the alkali solution is 7.8, and the mol ratio of the nickel element, cobalt element and manganese element in the coprecipitation reaction system is 1.67:1.67:6.7, suction filtration, to The obtained solid is dried and sieved to obtain mixed metal carbonate;

[0090] Wherein, the Na in the alkaline solution 2 CO 3 The solute mass ratio to ammonia water is 13:1, and the nickel salt is NiSO 4 , the cobalt salt is ...

Embodiment 3

[0100] The present embodiment adopts the following method to prepare the positive electrode material of sodium ion battery:

[0101] (1) Na 2 CO 3 Fully dissolve 0.3mol / L ammonia water in deionized water to obtain an alkaline solution, mix it with a mixed metal salt solution containing nickel salt, cobalt salt and manganese salt, carry out a co-precipitation reaction at 50°C, and add the manganese salt solution dropwise to the co-precipitation reaction In the precipitation reaction system, the pH of the coprecipitation reaction system controlled by the flow rate of the alkali solution is 8.2, and the mol ratio of the nickel element, cobalt element and manganese element in the coprecipitation reaction system is 1.67:1.67:6.7, suction filtration, to The obtained solid is dried and sieved to obtain mixed metal carbonate;

[0102] Wherein, the Na in the alkaline solution 2 CO 3 The solute mass ratio to ammonia water is 13:1, and the nickel salt is NiSO 4 , the cobalt salt is ...

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Abstract

The invention provides a sodium-ion battery positive electrode material, a preparation method thereof and a sodium-ion battery. The chemical formula of the sodium-ion battery positive electrode material is NaxNi0.167Co0.167Mn0.6702, wherein x is more than or equal to 0.5 and less than or equal to 0.8, the shape of the sodium-ion battery positive electrode material is spherical, and the concentrations of manganese and nickle are distributed in a gradient manner along the radial direction. The preparation method provided by the invention comprises the following steps: (1) mixing aqueous alkali with a mixed metal salt solution, performing co-precipitation reaction, adding a manganese solution into a co-precipitation reaction system, and performing solid-liquid separation, so as to obtain a precipitate which is mixed metal carbonate; (2) presintering the mixed metal carbonate in an air atmosphere to obtain a mixed metal oxide; and (3) mixing the mixed metal oxide with a sodium source and then calcining, thus obtaining the sodium-ion battery positive electrode material. The sodium-ion battery positive electrode material provided by the invention has excellent specific capacity and cycleperformance.

Description

technical field [0001] The invention belongs to the field of energy materials, and relates to a positive electrode material of a sodium ion battery, a preparation method thereof and a sodium ion battery. Background technique [0002] With the increasingly serious problems of energy shortage and environmental pollution, the development of clean and sustainable new energy has become the focus of scientists all over the world. Traditional lithium-ion batteries have been successfully used in large-scale energy storage fields such as portable devices and aerospace. However, due to the shortage of lithium resources and rising prices, how to develop a green, environmentally friendly, renewable and inexpensive clean energy has attracted widespread attention and research. Since sodium and lithium are in the same main group, the chemical properties are the most similar, and the reserves are abundant and the price is low. Therefore, the development of a cathode material for sodium-ion...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M10/054
CPCH01M4/505H01M4/525H01M10/054Y02E60/10
Inventor 罗绍华王志远包硕王庆闫绳学冯建张亚辉刘欢刘颖颖刘延国郝爱民
Owner 东北大学秦皇岛分校
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