Mn-based cathode material of Na-ion battery

A technology of sodium ion battery and cathode material, applied in the field of electrochemistry, can solve the problems of changing material structure, restricting the widespread promotion of sodium ion battery, reducing the practicability of manganese-based layered materials, etc. The effect of good environmental stability

Active Publication Date: 2017-11-28
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, manganese-based layered materials also have their inherent disadvantages. Such materials are easily reacted with water and carbon dioxide when exposed to the air. In addition, this type of material is easy to dissolve manganese into the electrolyte during the charging and discharging process of the battery. Changes the structure of the material, greatly reducing the practicability of manganese-based layered materials
[0004] At present, there is no environmentally stable layered cathode material for sodium-ion batteries that meets the commercialization requirements of sodium-ion batteries, which restricts the widespread promotion of sodium-ion batteries.

Method used

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  • Mn-based cathode material of Na-ion battery
  • Mn-based cathode material of Na-ion battery
  • Mn-based cathode material of Na-ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) According to the molar ratio of 0.5:0.4:0.1:0.1, accurately weigh the corresponding mass of Na 2 CO 3 , Mn 2 o 3 , NiO and TiO 2 , put into the ball mill tank, and then add ball mill balls into it, and ball mill for 20h under the condition of 200r / min, and mix the above precursors evenly.

[0036] (2) Press the ball-milled mixture into a disc with a diameter of 16 mm under a pressure of 4 MPa.

[0037] (3) Place the sheet-shaped sample obtained in step (2) in a tube furnace, raise the temperature to 900°C at 5°C / min in an oxygen atmosphere, and heat-treat for 15 hours; quench to room temperature to obtain a manganese-based positive electrode material for a sodium-ion battery , whose molecular formula is NaMn 0.8 Ni 0.1 Ti 0.1 o 2 , the material is in the form of powder particles with a particle size of 2-10 μm.

[0038] The manganese-based positive electrode material of the sodium-ion battery prepared above was characterized, and the results were as follows...

Embodiment 2

[0042] Change the molar ratio of each substance, according to the molar ratio of 0.5:0.45:0.05:0.05, accurately weigh the corresponding mass of Na 2 CO 3 , Mn 2 o 3 , NiO and TiO 2 , according to the method of step (1)-(3) in embodiment 1, the manganese-based cathode material of sodium-ion battery is prepared, and its molecular formula is NaMn 0.9 Ni 0.05 Ti 0.05 o 2 .

Embodiment 3

[0044] Change the molar ratio of each substance, according to the molar ratio of 0.5:0.35:0.15:0.15, accurately weigh the corresponding mass of Na 2 CO 3 , Mn 2 o 3 , NiO and TiO 2 , according to the method of step (1)-(3) in embodiment 1, the manganese-based cathode material of sodium-ion battery is prepared, and its molecular formula is NaMn 0.7 Ni 0.15 Ti 0.15 o 2 .

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Abstract

The invention relates to a Mn-based cathode material of a Na-ion battery. A general formula of the Mn-based cathode material is NaMnXTiYM(1-X-Y)O2, wherein M is Ni, Co or Fe, X is larger than 0.5 and smaller than 1, and Y is larger than 0 and smaller than 0.5; the cathode material is granular, and a titanium oxide layer is formed on the surface of the cathode material. A preparation method of the material is simple, the raw materials are rich, the cost is low, the practical degree is high, the synthesized cathode material is uniform in grain size, Ti is enriched on the surface, the cathode material has good stability in wet air and an organic electrolyte, and the material structure can be kept very well in charge-discharge process; when the material is taken as the cathode material of the Na-ion battery, cycling stability and rate capability of the battery can be effectively improved. The method has good application prospect in optimization of performance of a Na-ion battery energy storage device.

Description

technical field [0001] The invention relates to the field of electrochemistry, in particular to a manganese-based cathode material for a sodium ion battery. Background technique [0002] Sodium is the sixth most abundant element in the earth's crust. It has similar physical and chemical properties to lithium and is cheap. Therefore, sodium-ion batteries are considered to be one of the most promising new energy storage materials to replace lithium-ion batteries. However, sodium-ion batteries have problems such as difficulty in the migration of sodium ions, poor stability, and low energy density. [0003] In recent years, layered transition metal oxides have attracted a lot of attention from researchers due to their advantages such as high specific capacity, simple preparation method, and environmental friendliness. In particular, manganese-based layered materials are considered to be one of the most promising cathode materials for commercialization due to their low price and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/054B82Y30/00
CPCB82Y30/00H01M4/366H01M4/505H01M4/525H01M4/628H01M10/054Y02E60/10
Inventor 郭少华周豪慎
Owner NANJING UNIV
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