A kind of titanium-doped carbon-coated sodium iron phosphate material and preparation method thereof

A carbon-coated sodium iron phosphate and titanium doping technology, applied in active material electrodes, electrical components, electrochemical generators, etc., can solve the problems of high cost, complex operation steps, high energy consumption, and achieve reduced side reactions, The effect of fast ion transport and high specific surface area

Active Publication Date: 2018-01-02
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the titanium-doped carbon-coated lithium iron phosphate synthesized by this method has a high discharge specific capacity, it has high cost, complicated operation steps, and high energy consumption.

Method used

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  • A kind of titanium-doped carbon-coated sodium iron phosphate material and preparation method thereof
  • A kind of titanium-doped carbon-coated sodium iron phosphate material and preparation method thereof
  • A kind of titanium-doped carbon-coated sodium iron phosphate material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Add 0.09mol (12.96g) FeC 2 o 4 , 0.1mol (15.6g) NaH 2 PO 4 2H 2 O, 0.022mol (7.53g) sucrose and 0.01mol (0.8g) TiO 2 Put it in a ball mill jar, add 60mL of ethanol as a dispersant, mix well, ball mill at a speed of 200r / min for 4h, and then dry in an oven at 80°C for 15h to obtain a precursor; (2) Step (1) The obtained precursor is placed in a ball mill, and ground at a speed of 150r / min for 1 hour to obtain a powdery precursor; (3) The powdery precursor obtained in step (2) is calcined at 600°C under high-purity argon 8h, Ti-doped carbon-coated NaFePO was obtained 4 Material.

[0033] Such as figure 1 As shown, the obtained titanium-doped carbon-coated sodium iron phosphate positive electrode material has high crystallinity and complete crystal form, and what is detected is sodium iron phosphate.

[0034] Such as figure 2 As shown, the primary particles of the obtained titanium-doped carbon-coated sodium iron phosphate positive electrode material are relati...

Embodiment 2

[0040] (1) 0.099mol (14.256g) FeC 2 o 4 , 0.1mol (15.6g) NaH 2 PO 4 2H 2 O, 0.019mol (6.5g) sucrose and 0.001mol (0.08g) TiO 2 Put it in a ball mill jar, add 120mL of ethanol as a dispersant, mix well, ball mill at a speed of 100r / min for 3h, and then dry in an oven at 60°C for 10h to obtain a precursor; (2) Step (1) The obtained precursor is placed in a ball mill, and ground at a speed of 100r / min for 0.5h to obtain a powdery precursor; (3) The powdery precursor obtained in step (2) is placed under high-purity argon at 550°C, Calcined for 6h to obtain titanium-doped carbon-coated NaFePO 4 Material.

[0041] Battery assembly: Weigh 0.24g of titanium-doped NaFePO obtained in this example 4 The material is used as the positive electrode material, adding 0.03g acetylene black (SP) as the conductive agent and 0.03g PVDF (HSV-900) as the binder, after fully grinding, add 2mL NMP to disperse and mix, mix the slurry evenly, and pull it on a 16μm thick aluminum foil Slurry was...

Embodiment 3

[0043] (1) Add 0.08mol (11.52g) FeC 2 o 4 , 0.1mol (15.6g) NaH 2 PO 4 2H 2 O, 0.0263mol (9.0g) sucrose and 0.02mol (1.6g) TiO 2 Put it in a ball mill jar, add 90mL ethanol as a dispersant, mix evenly, ball mill at a speed of 300r / min for 7h, and then dry in an oven at 90°C for 24h to obtain a precursor; (2) Step (1) The obtained precursor is placed in a ball mill, and ground at a speed of 200r / min for 2 hours to obtain a powdery precursor; (3) The powdery precursor obtained in step (2) is calcined at 650°C under high-purity argon 10h, Ti-doped carbon-coated NaFePO 4 Material.

[0044] Battery assembly: Weigh 0.24g of titanium-doped NaFePO obtained in this example 4 The material is used as the positive electrode material, adding 0.03g acetylene black (SP) as the conductive agent and 0.03g PVDF (HSV-900) as the binder, after fully grinding, add 2mL NMP to disperse and mix, mix the slurry evenly, and pull it on a 16μm thick aluminum foil Slurry was used to make the positi...

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Abstract

The invention relates to a titanium-doped carbon-coated sodium ferric phosphate material and a preparation method thereof. The titanium-doped carbon-coated sodium ferric phosphate material is prepared by virtue of the following method: taking cane sugar as a carbon source, taking ethanol as a dispersing agent, ball milling FeC2O4, NaH2PO4.2H2O, cane sugar and TiO2 in the ethanol, drying, re-milling, and calcining, to obtain the titanium-doped carbon-coated sodium ferric phosphate material. The particle size of primary particles of the titanium-doped carbon-coated sodium ferric phosphate material is 100nm to 300nm, the titanium-doped carbon-coated sodium ferric phosphate material has characteristics of short sodium ion dispersion distance, high transmission rate, high specific surface area, high conductivity, high ion transmission speed and the like, and is excellent in electrochemical performance, capable of being used as a positive material of a secondary sodium-ion battery, high in safety, cheap in price, wide in application range and applicable to an energy storage device, a backup power supply, a reserved power supply and the like. The preparation method is low in synthetic temperature, simple in procedures, easy for obtaining raw materials and convenient in industrialization.

Description

technical field [0001] The invention relates to a sodium ion battery cathode material and a preparation method thereof, in particular to a titanium-doped carbon-coated sodium iron phosphate material and a preparation method thereof. Background technique [0002] Since the 1990s, lithium-ion batteries have been widely used in electronic devices such as mobile devices due to their high energy density and light weight. However, lithium-ion batteries have disadvantages such as high price and limited reserves. [0003] CN 102013496 A discloses a metal titanium-doped carbon-coated lithium iron phosphate and a preparation method thereof. The steps are as follows: (1) Lithium source, Fe 2 o 3 、TiO 2 and NH 4 h 2 PO 4 Dosing is weighed according to the ratio of molar ratio lithium: iron: titanium: phosphorus = 1:1-x:x:1, where 0<x≤0.2; (2) Add acetone to the prepared powder and place it in a ball mill Rotate at a rate of 200-500r / min for 2-10 hours, the amount of acetone is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M4/136H01M4/1397H01M10/054
CPCH01M4/136H01M4/1397H01M4/362H01M4/5825H01M4/626H01M10/054H01M2004/028Y02E60/10
Inventor 张宝刘益明磊张佳峰王小玮童汇
Owner CENT SOUTH UNIV
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