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Double-strategy modified layered oxide sodium-ion battery positive electrode material as well as preparation method and application thereof

A sodium-ion battery and positive electrode material technology, applied in active material electrodes, chemical electrode manufacturing, electrode manufacturing, etc., can solve problems such as unsatisfactory cycle stability, and achieve good industrial production potential, good application prospects, and high working voltage.

Pending Publication Date: 2022-05-20
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a very important positive electrode material in sodium-ion batteries, layered oxide materials have always occupied an important position in scientific research and industry because of their high voltage and specific capacity, simple synthesis process, and good tap (compact) density. status, but its cyclical stability is still unsatisfactory

Method used

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  • Double-strategy modified layered oxide sodium-ion battery positive electrode material as well as preparation method and application thereof
  • Double-strategy modified layered oxide sodium-ion battery positive electrode material as well as preparation method and application thereof
  • Double-strategy modified layered oxide sodium-ion battery positive electrode material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Step 1, sol-gel method combined with wet chemical method to prepare Na 0.67 Ni 0.28 Mg 0.05 mn 0.67 o 2 -1%ZrO 2 Cathode material

[0043] The target product of synthesis is Na 0.67 Ni 0.28 Mg 0.05 mn 0.67 o 2 -1%ZrO 2 The positive electrode material is composed of sodium acetate, nickel acetate, magnesium acetate and manganese acetate, the chelating agent is citric acid, and the solvent is deionized water.

[0044] Sodium acetate, nickel acetate, magnesium acetate and manganese acetate are dissolved in desiccant according to the molar ratio in the target product and citric acid (the total molar weight of sodium, nickel, magnesium and manganese metal ions and the molar ratio of citric acid are 1:1.6). In deionized water, place in an oil bath at 80°C with constant stirring and evaporate to dryness until a gel is formed. The gel was dried in an oven at 150 °C for 6 h, and then it was ground in a mortar to obtain the precursor powder. The precursor powder was ...

Embodiment 2

[0059] The preparation method is the same as that of Example 1, except that the raw materials are 0.67 Ni 0.28 Mg 0.05 mn 0.67 o 2 -0.5%ZrO 2 The stoichiometric ratio is added.

[0060] Figure 9 It is the XRD spectrum of the target product obtained in Example 2. It can be seen from the figure that the synthesized material has good crystallinity, and has a P2 phase structure and a P63 / mmc space group.

[0061] Figure 10 For the obtained target product of embodiment 2 at 0.1C (1C=173mAg -1 ) charge-discharge curve at the current density, it can be seen from the figure that this material has a higher specific capacity of 122.9mAh g when applied to sodium-ion batteries -1 .

Embodiment 3

[0063] The preparation method is the same as that of Example 1, except that the raw materials are 0.67 Ni 0.28 Mg 0.05 mn 0.67 o 2 -2%ZrO 2 The stoichiometric ratio is added.

[0064] Figure 11 It is the XRD spectrum of the target product obtained in Example 3. It can be seen from the figure that the synthesized material has good crystallinity, and has a P2 phase structure and a P63 / mmc space group.

[0065] Figure 12 For the obtained target product of embodiment 3 at 0.1C (1C=173mAg -1 ) charge-discharge curve at the current density, it can be seen from the figure that this material has a higher specific capacity of 114.6mAh g when applied to sodium-ion batteries -1 .

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Abstract

The invention provides a double-strategy modified layered oxide sodium ion battery positive electrode material as well as a preparation method and application thereof, the positive electrode material is obtained by modifying a P2 type nickel-manganese-based layered transition metal oxide Na < 0.67 > Ni < 0.33 > Mn < 0.67 > O2 through double strategies of Mg < 2 + > doping and ZrO2 surface modification, and the chemical formula of the positive electrode material is Na < 0.67 > Ni < 0.33-x > Mg < x > Mn < 0.67 > O2-n% ZrO2, 0 lt, xlt; 0 < = n% < = 3%, and n% represents the mass percentage of ZrO2 in the sodium ion battery positive electrode material. The positive electrode material provided by the invention has the advantages of high working voltage, stable structure, good cycling stability, good rate capability under high current density and the like, and has a good application prospect in sodium ion battery positive electrode materials.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a dual-strategy modified layered oxide sodium-ion battery positive electrode material and a preparation method and application thereof. Background technique [0002] As one of the three pillars of the development of human civilization, energy has always been a hot issue that people pay attention to. The depletion of traditional non-renewable fossil energy such as coal and oil has made people pay more and more attention to renewable energy such as wind energy, solar energy, and hydropower. But unfortunately, this kind of renewable energy has the characteristics of regionality and discontinuity. It cannot be directly integrated into the grid, and needs to be stored with energy storage equipment first. Due to the high abundance of sodium and the similar working principle to lithium-ion batteries, sodium-ion batteries have become more and more popular in the field of e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/525H01M4/505H01M4/485H01M4/04H01M4/131H01M4/1391H01M10/054
CPCH01M4/366H01M4/525H01M4/505H01M4/0471H01M4/485H01M4/049H01M4/131H01M4/1391H01M10/054H01M2004/028Y02E60/10
Inventor 章根强万广林
Owner UNIV OF SCI & TECH OF CHINA
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