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Sodium titanium phosphate surface modified P2-type manganese-based sodium ion battery positive electrode material with Nasicon structure and preparation method thereof

A sodium-ion battery and positive electrode material technology, applied in the direction of battery electrodes, positive electrodes, secondary batteries, etc., to achieve low cost, good reproducibility, and reduce side reactions

Active Publication Date: 2020-04-28
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003]Sodium titanium phosphate has an open three-dimensional framework and a fast ion diffusion rate. It is often used in solid electrolytes and sodium anodes. It is an ideal coating material. Currently There is no literature report on the surface modification of sodium titanium phosphate cathode material

Method used

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  • Sodium titanium phosphate surface modified P2-type manganese-based sodium ion battery positive electrode material with Nasicon structure and preparation method thereof
  • Sodium titanium phosphate surface modified P2-type manganese-based sodium ion battery positive electrode material with Nasicon structure and preparation method thereof
  • Sodium titanium phosphate surface modified P2-type manganese-based sodium ion battery positive electrode material with Nasicon structure and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0031] (1) According to the synthesis of 10g of Na 0.65 Ni 0.16 co 0.14 mn 0.7 o 2 The molar ratio of Mn, Ni and Co elements in the solution is weighed manganese nitrate, nickel nitrate and cobalt nitrate and dissolved in 200mL deionized water, adding sodium nitrate in excess of 1mol%, stirring constantly, after the metal salt is dissolved, weigh 1g of citric acid Add it to the solution, stir and evaporate to dryness at 80°C to obtain a gel substance.

[0032] (2) Vacuum-dry the gel obtained in step (1) at 80°C, crush it, pre-calcine at 400°C for 4 hours in an air atmosphere, then sinter at 850°C for 12 hours, and cool to room temperature to obtain the pure phase P2 NaNCM is a positive electrode material for manganese-based sodium-ion batteries.

[0033] (3) Weigh 5g of the pure-phase product NaNCM and disperse it in 50mL of absolute ethanol, stir for 1 hour to obtain a uniformly dispersed suspension, and then 2 (PO 4 ) 3 The mass ratio to NaNCM is 0.0005:1. Weigh buty...

Embodiment 2

[0037] (1) According to the synthesis of 10g of Na 2 / 3 Ni 1 / 3 mn 2 / 3 o 2 In the mol ratio of Mn, Ni element, take manganese acetate, nickel acetate and dissolve in 200mL deionized water, add sodium acetate excessive 3mol%, keep stirring, after the step metal salt dissolves, take by weighing 2g of citric acid and add in the solution, Stir and evaporate to dryness at 90°C to obtain a gel substance.

[0038] (2) Vacuum-dry the gel obtained in step (1) at 90°C, crush it, pre-calcine at 500°C for 5 hours in an air atmosphere, then sinter at 925°C for 15 hours, and cool to room temperature to obtain the pure phase P2 Manganese-based sodium-ion battery cathode material NaNM.

[0039] (3) Weigh 5g of the pure-phase product NaNM and disperse it in 20mL of acetone, stir for 2 hours to obtain a uniformly dispersed suspension, and then 2 (PO 4 ) 3 The mass ratio of NaNM to NaNM is 0.1:1. Weigh titanium isopropoxide and add it to the suspension, then use deionized water to prepare d...

Embodiment 3

[0043] (1) According to the synthesis of 10g of Na 0.5 Ni 0.23 Fe 0.13 mn 0.63 o 2 The molar ratio of Mn, Ni and Fe in the element is weighed manganese nitrate, nickel nitrate and ferrous nitrate and dissolved in 200mL of deionized water, the excess of sodium nitrate added is 5 mol%, stirring constantly, after the step metal salt is dissolved, weigh 5g Tartaric acid was added to the solution, stirred and evaporated to dryness at 100°C to obtain a gel substance.

[0044] (2) Vacuum-dry the gel obtained in step (1) at 100°C, crush it, pre-calcine at 600°C for 6 hours in an air atmosphere, then sinter at 1000°C for 18 hours, and cool to room temperature to obtain the pure phase P2 Manganese-based sodium-ion battery cathode material NaNFM.

[0045] (3) Weigh 5g of the pure-phase product NaNFM and disperse it in 25mL of absolute ethanol and 25mL of acetone mixed solution, stir for 3 hours to obtain a uniformly dispersed suspension, and then 2 (PO 4 ) 3 The mass ratio to NaN...

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Abstract

The invention discloses a sodium titanium phosphate surface modified P2-type manganese-based sodium ion battery positive electrode material with a Nasicon structure and a preparation method of the material. The material is composed of a surface coating layer and a P2-type manganese-based sodium ion battery positive electrode material, wherein the surface coating layer is NaTi2(PO4)3, and the P2-type manganese-based sodium ion battery positive electrode material is NaxMnaM<1-a>O2. According to the invention, the sodium titanium phosphate surface modified P2 type manganese-based sodium ion battery positive electrode material is prepared by preparing a precursor through a sol-gel method and carrying out high-temperature solid-phase sintering reaction and surface modification. The surface coating layer is provided with a rapid sodium ion diffusion channel, so that sodium ion de-intercalation is facilitated. By utilizing the NaTi2(PO4)3 surface modified P2-type manganese-based sodium ion battery positive electrode material, the cycle performance and the rate capability of the material can be effectively improved. The preparation method disclosed by the invention is simple to operate, low in cost, environment-friendly and easy to realize industrial large-scale production.

Description

technical field [0001] The invention belongs to the technical field of preparation of electrode materials for sodium ion batteries, and in particular relates to a Nasicon structure sodium titanium phosphate surface-modified P2 type manganese-based sodium ion battery positive electrode material and a preparation method thereof. Background technique [0002] In recent years, with the rise of research on cheaper and more efficient electrochemical energy storage technologies, people have refocused on sodium-ion batteries, and have researched and developed a series of positive and negative electrode materials for sodium-ion batteries. Cathode materials for sodium-ion batteries are key materials for sodium-ion batteries, and a lot of research work has been done on cathode materials for sodium-ion batteries. Due to the advantages of relatively low cost, high capacity, and long cycle life, P2-type manganese-based sodium-ion battery cathode materials have great application prospects....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/505H01M10/054
CPCH01M4/505H01M4/628H01M10/054H01M2004/028H01M2004/021Y02E60/10
Inventor 杨成浩邓强郑锋华钟文涛
Owner SOUTH CHINA UNIV OF TECH
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