Sodium ferric phosphate-coated carbon nanotube positive electrode material with low iron-phosphorus ratio and preparation method of sodium ferric phosphate-coated carbon nanotube positive electrode material

A technology of carbon nanotubes and sodium iron phosphate, applied in nanotechnology, nanotechnology, electrode manufacturing, etc., can solve the problems of high cost and high equipment requirements, and achieve the effects of increasing cycle life, low preparation cost, and reducing diffusion distance

Pending Publication Date: 2022-08-02
宁波市稻禾科技有限公司
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Problems solved by technology

This method prepares sodium iron phosphate with high discharge specific capacity and excellent rate performance, but because ethanol is used as a dispersion solvent, the cost is high and the requirements for equipment are relatively high

Method used

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  • Sodium ferric phosphate-coated carbon nanotube positive electrode material with low iron-phosphorus ratio and preparation method of sodium ferric phosphate-coated carbon nanotube positive electrode material
  • Sodium ferric phosphate-coated carbon nanotube positive electrode material with low iron-phosphorus ratio and preparation method of sodium ferric phosphate-coated carbon nanotube positive electrode material
  • Sodium ferric phosphate-coated carbon nanotube positive electrode material with low iron-phosphorus ratio and preparation method of sodium ferric phosphate-coated carbon nanotube positive electrode material

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[0031] The invention provides a preparation method of a low iron-phosphorus ratio sodium iron phosphate@carbon nanotube positive electrode material, comprising the following steps:

[0032] The iron source, phosphorus source, sodium source, carbon nanotube, dispersant and water are mixed and ground to obtain a mixed slurry; the mixed slurry is spray-dried to obtain a precursor; the precursor is calcined in a protective atmosphere to obtain a low Iron phosphorus ratio sodium iron phosphate@carbon nanotube cathode material.

[0033] In the present invention, the molar ratio of Na, Fe, and P in the mixed slurry is preferably 0.95-1:0.94-1:1, more preferably 0.955-0.98:0.955-0.99:1, more preferably 0.96:0.98:1 .

[0034] In the present invention, the mass of carbon nanotubes is preferably 0.5-5%, more preferably 0.8-4.1%, and more preferably 3.2% of the mass of the low iron-phosphorus ratio sodium iron phosphate@carbon nanotube cathode material.

[0035] In the present invention...

Embodiment 1

[0050] This embodiment provides a low iron-phosphorus ratio sodium iron phosphate@carbon nanotube cathode material, wherein the molar ratio of Na, Fe, and P is 0.96:0.955:1;

[0051] The preparation method includes the following steps:

[0052] (1) Disperse 18.0g polyethylene glycol in 1800mL ultrapure water, shear and disperse for 5min, then add 13.0g of carbon nanotubes, continue shearing and dispersing for 2h to form a uniformly dispersed conductive paste; mix 452.6g Fe, P Ferric phosphate with a molar ratio of 0.955:1 and 156.6 g of sodium carbonate were added to the conductive slurry in turn, transferred to a sand mill, and ground for 6 hours at a linear speed of 20 m / s (the grinding medium was zirconia balls with a particle size of 0.6 mm). ) to obtain a mixed slurry with a median particle size of 200 nm;

[0053] (2) carrying out two-fluid spray drying of the mixed slurry, controlling the temperature of the spray inlet to 240°C and the temperature of the outlet to 100°...

Embodiment 2

[0056] This embodiment provides a low iron-to-phosphorus ratio sodium iron phosphate@carbon nanotube positive electrode material, wherein the molar ratio of Na, Fe, and P is 0.97:0.95:1;

[0057] See Example 1 for the preparation method, except that in step (1), 452.6 g of Fe, iron phosphate with a P molar ratio of 0.95:1, and 154.2 g of sodium carbonate were added to the conductive paste.

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Abstract

The invention belongs to the technical field of sodium ion batteries, and discloses a sodium ferric phosphate and carbon nanotube positive electrode material with a low iron-phosphorus ratio and a preparation method thereof. The preparation method comprises the following steps: mixing an iron source, a phosphorus source, a sodium source, a carbon nanotube, a dispersing agent and water, grinding, performing spray drying, and finally calcining in a protective atmosphere to obtain the positive electrode material. The positive electrode material is of a micro-nano spherical structure, and the introduction of a carbon nanotube conductive network can greatly improve the positive electrode conductivity of the material and prolong the cycle life of the material; the intrinsic conductivity of the sodium ferric phosphate can be improved by reducing the iron-phosphorus ratio in the sodium ferric phosphate; the design of the micro-nano spherical structure can reduce the diffusion distance of sodium ions and increase the rate capability of the sodium ions. The preparation method has the advantages of simple preparation process flow, easiness in large-scale production, wide raw material source, low preparation cost and environmental friendliness.

Description

technical field [0001] The invention relates to the technical field of sodium ion batteries, in particular to a low iron-to-phosphorus ratio sodium iron phosphate@carbon nanotube positive electrode material and a preparation method thereof. Background technique [0002] At present, lithium batteries have frequent fire accidents, and electric vehicles and energy storage accidents frequently occur. The electrochemical performance of sodium-ion batteries is relatively stable, and it is easy to passivate and deactivate during thermal runaway. The safety test performance is better than that of lithium-ion batteries. The sodium-ion battery does not emit smoke, fire, or explode when it is acupuncture, and it will not catch fire and burn after being subjected to short-circuit, overcharge, over-discharge, extrusion and other experiments. Compared with the initial self-heating temperature of lithium-ion battery reaching 165 °C, the initial self-heating temperature of sodium-ion batter...

Claims

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Application Information

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IPC IPC(8): H01M4/04H01M4/36H01M4/58H01M4/62H01M10/054B82Y40/00B82Y30/00
CPCH01M4/0471H01M4/366H01M4/5825H01M4/625H01M10/054B82Y40/00B82Y30/00H01M2004/028H01M2004/021Y02E60/10
Inventor 焦玉志秦军李金武张超阮殿波李胜
Owner 宁波市稻禾科技有限公司
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