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Layered manganese-based positive electrode material of sodium-ion battery and preparation method thereof

A technology of sodium ion battery and cathode material, which is applied in the field of electrochemistry to achieve the effects of good safety performance, short preparation time and simple operation

Inactive Publication Date: 2020-10-13
NINGXIA UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no record of the successful preparation of layered manganese-based cathode materials for sodium-ion batteries with structural characteristics without phase transition in a wide voltage range by liquid-phase method.

Method used

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  • Layered manganese-based positive electrode material of sodium-ion battery and preparation method thereof
  • Layered manganese-based positive electrode material of sodium-ion battery and preparation method thereof
  • Layered manganese-based positive electrode material of sodium-ion battery and preparation method thereof

Examples

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Effect test

Embodiment 1

[0041] Na 2 / 3 Ni 1 / 3 mn 2 / 3-x Ti x o 2 The preparation method of (x=1 / 10) comprises the following steps: take by weighing 1.20g sodium nitrate, 4.08g manganese nitrate, 1.92g nickel nitrate hexahydrate and 0.58g tetrabutyl titanate are dissolved in distilled water, then add 6.42g anhydrous Citric acid, heated to 60°C and subjected to magnetic stirring to obtain a gel. The gel was dried at 100°C for 5 h to obtain a solid sample, which was then manually ground into a powder. The obtained sample was transferred to a tube furnace, heated to 700°C in an air atmosphere for calcination, the heating rate was 5°C / min, calcined for 12 hours, and the positive electrode material was obtained after natural cooling, and its molecular formula was Na 2 / 3 Ni 1 / 3 mn 17 / 30 Ti 1 / 10 o 2 .

Embodiment 2

[0043] Na 2 / 3 Ni 1 / 3 mn 2 / 3-x Ti x o 2 The preparation method of (x=1 / 10) comprises the following steps: take by weighing 1.20g sodium nitrate, 4.08g manganese nitrate, 1.92g nickel nitrate hexahydrate and 0.58g tetrabutyl titanate are dissolved in distilled water, then add 6.42g anhydrous Citric acid, heated to 70°C and subjected to magnetic stirring to obtain a gel. The gel was dried at 100°C for 6 h to obtain a solid sample, which was then manually ground into powder. The obtained sample was transferred to a tube furnace, heated to 900°C in an air atmosphere for calcination, the heating rate was 5°C / min, and calcined for 10 hours. After natural cooling, the positive electrode material was obtained, and its molecular formula was Na 2 / 3 Ni 1 / 3 mn 17 / 30 Ti 1 / 10 o 2 . Na prepared in this example 2 / 3 Ni 1 / 3 mn 17 / 30 Ti 1 / 10 o 2 See the XRD pattern of figure 1 , SEM image see image 3 . Na prepared in this example 2 / 3 Ni 1 / 3 mn 17 / 30 Ti 1 / 10 o 2 The first...

Embodiment 3

[0045] Na 2 / 3 Ni 1 / 3 mn 2 / 3-x Ti x o 2 The preparation method of (x=2 / 10) comprises the following steps: take by weighing 1.20g sodium nitrate, 3.365g manganese nitrate, 1.92g nickel nitrate hexahydrate and 1.36g tetrabutyl titanate are dissolved in distilled water, then add 6.42g anhydrous Citric acid, heated to 60°C and subjected to magnetic stirring to obtain a gel. The gel was dried at 100°C for 5 h to obtain a solid sample, which was then manually ground into a powder. The obtained sample was transferred to a tube furnace, heated to 700°C in an air atmosphere for calcination, the heating rate was 5°C / min, calcined for 12 hours, and the positive electrode material was obtained after natural cooling, and its molecular formula was Na 2 / 3 Ni 1 / 3 mn 7 / 15 Ti 2 / 10 o 2 .

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Abstract

The invention discloses a layered manganese-based positive electrode material of a sodium-ion battery and a preparation method of the layered manganese-based positive electrode material. The general formula of the positive electrode material is Na<2 / 3>Ni<1 / 3>Mn<2 / 3-x>Ti<x>O<2> (1 / 10 < = x < = 3 / 10). The manganese-based positive electrode material prepared by the invention has a P2-phase layered structure, smooth surface morphology and uniform size, and the particle size is 1-3 microns. The material does not generate phase transformation in the charging and discharging process within a wide voltage range of 2.5-4.4 V, has good structural stability and stability in air, and has excellent rate capability and cycling stability. A sol-gel method and a high-temperature calcination method are adopted for synthesis, the preparation process is easy and convenient to operate, the sintering temperature is low, time is short, and energy consumption is low.

Description

technical field [0001] The invention relates to the technical field of electrochemistry, in particular to a layered manganese-based cathode material for a sodium ion battery and a preparation method thereof. Background technique [0002] In recent years, my country has developed rapidly in new energy fields such as solar energy, wind energy, geothermal energy, and tidal energy. However, these clean energy sources are highly random, regional, intermittent, and unstable. The power grid will have a huge impact on the entire system. The development of a smart grid with efficient energy storage technology can not only improve energy utilization efficiency, but also improve the stability of grid output power, so as to achieve continuous and stable large-scale application of new energy. [0003] Among many energy storage technologies, electrochemical energy storage has the advantages of high energy density, high power density, high conversion efficiency, and good safety performance,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00H01M4/485H01M4/505H01M4/525H01M10/054
CPCC01G53/006C01P2002/20C01P2004/61H01M4/485H01M4/505H01M4/525H01M10/054Y02E60/10
Inventor 曹志杰李丽江马晓波
Owner NINGXIA UNIVERSITY
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