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A transition metal-doped sodium titanomanganese phosphate/carbon composite positive electrode material and its preparation and application in sodium-ion batteries

A composite positive electrode material, titanium manganese sodium phosphate technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of difficult capacity, poor rate performance, and low conductivity

Active Publication Date: 2021-03-12
湖南钠邦新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However Na 3 MnTi(PO 4 ) 3 The conductivity is low, the capacity is difficult to develop, and the rate performance is extremely poor

Method used

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  • A transition metal-doped sodium titanomanganese phosphate/carbon composite positive electrode material and its preparation and application in sodium-ion batteries
  • A transition metal-doped sodium titanomanganese phosphate/carbon composite positive electrode material and its preparation and application in sodium-ion batteries
  • A transition metal-doped sodium titanomanganese phosphate/carbon composite positive electrode material and its preparation and application in sodium-ion batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Take 0.015 mol of sodium acetate, 0.0045 mol of manganese acetate, 0.005 mol of tetrabutyl titanate, 0.0005 mol of iron acetate, 0.015 mol of ammonium dihydrogen phosphate and 0.5 g of polyvinylpyrrolidone, and dissolve them in 100 mL of deionized water in sequence. The solution was transferred to a reaction kettle, and the spherical precursor was synthesized by hydrothermal treatment at 180 °C for 24 hours; the precursor was treated at 650 °C for 6 h under an argon atmosphere to obtain nitrogen-doped carbon-modified spherical Na 3 mn 0.9 Fe 0.1 Ti(PO 4 ) 3 / C Composite. The produced Na 3 mn 0.9 Fe 0.1 Ti(PO 4 ) 3 The X-ray diffraction pattern (XRD) of / C cathode material sees figure 1 . The produced Na 3 mn 0.9 Fe 0.1 Ti(PO 4 ) 3 The shape of / C is spherical, and the particle size is 200-500nm.

[0062] The positive electrode material of the sodium ion battery prepared in this example and the sodium sheet are assembled into a button battery, as can be s...

Embodiment 2

[0064] Take 0.015mol sodium acetate, 0.004mol manganese acetate, 0.005mol tetrabutyl titanate, 0.001mol iron acetate, 0.015mol ammonium dihydrogen phosphate and 0.5g polyvinylpyrrolidone, and dissolve them in 100mL deionized water in sequence. The solution was transferred to a reaction kettle and subjected to hydrothermal treatment at 180°C for 24 hours to synthesize a spherical precursor; the precursor was treated at 650°C for 5 hours under an argon atmosphere to obtain nitrogen-doped carbon-modified spherical Na 3 mn 0.8 Fe 0.2 Ti(PO 4 ) 3 / C Composite. The sodium ion battery cathode material prepared in this embodiment and the sodium sheet are assembled into a button battery, and Na 3 mn 0.8 Fe 0.2 Ti(PO 4 ) 3 The / C sodium-ion battery has a specific capacity of 107.5mAh / g at a rate of 0.05C, and a specific capacity of 47.2mAh / g at a high rate of 20C.

Embodiment 3

[0066] Take 0.015mol sodium acetate, 0.0045mol manganese acetate, 0.005mol tetrabutyl titanate, 0.0005mol cobalt acetate, 0.015mol ammonium dihydrogen phosphate and 0.5g polyvinylpyrrolidone, and dissolve them in 100mL deionized water in sequence. The solution was transferred to a reaction kettle and subjected to hydrothermal treatment at 180°C for 24 hours to synthesize a spherical precursor; the precursor was treated at 650°C for 5 hours under an argon atmosphere to obtain nitrogen-doped carbon-modified spherical Na 3 mn 0.9 co 0.1 Ti(PO 4 ) 3 / C Composite. The sodium ion battery cathode material prepared in this embodiment and the sodium sheet are assembled into a button battery, and Na 3 mn 0.9 co 0.1 Ti(PO 4 ) 3 The / C sodium-ion battery has a specific capacity of 117.5mAh / g at a rate of 0.05C, and a specific capacity of 63.6mAh / g at a high rate of 20C.

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Abstract

The invention belongs to the field of sodium ion battery materials, and specifically discloses a transition metal-doped sodium titanium manganese phosphate / carbon composite positive electrode material, which is a composite material of transition metal doped titanium manganese sodium phosphate and carbon materials. The chemical formula of metal doped titanium manganese sodium phosphate is Na 3 mn 1‑x m x Ti(PO 4 ) 3 , wherein, 0<x≤0.2; M is a transition metal Fe, Co or Ni. The invention also discloses the preparation and application of the composite cathode material. The present inventors found that by partially replacing the manganese in the sodium titanium manganese phosphate lattice with the transition metal, the electrical performance can be significantly improved, especially the capacity performance under high current can be significantly improved; it can be used as a positive electrode material for a sodium ion battery. High voltage, high capacity and excellent cycle stability. The preparation method is simple to operate and has broad prospects for commercial application.

Description

technical field [0001] The invention relates to a high-energy sodium ion battery cathode material, in particular to a sodium fast ion conductor type cathode material and the application of the material as a sodium ion battery, belonging to the field of sodium ion batteries. Background technique [0002] Due to the advantages of high energy density, high stability, and long life, lithium-ion batteries have rapidly occupied the market of portable electronic products (notebook computers, smart mobile equipment, tablet computers, etc.), and continue to penetrate into the field of electric vehicles. However, the reserves of lithium resources in the earth's crust are low and the geographical distribution is uneven, which makes lithium prices continue to rise during the process of large-scale promotion and application of lithium-ion batteries, resulting in high prices for lithium-ion batteries. Therefore, the application of lithium-ion batteries in the field of large-scale power st...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/054H01M4/136
CPCH01M4/136H01M4/366H01M4/5825H01M4/625H01M4/626H01M4/628H01M10/054Y02E60/10
Inventor 张治安赖延清李煌旭王大鹏张凯李劼
Owner 湖南钠邦新能源有限公司
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