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Preparation method of layered carbon-doped sodium ferric phosphate positive electrode material

A technology of sodium iron phosphate and positive electrode materials, which is applied in the direction of positive electrodes, battery electrodes, active material electrodes, etc., can solve the problems of low specific capacity, poor cycle performance and discharge rate performance of sodium-ion batteries, and achieve improved discharge specific capacity, Enhanced cycle stability and short diffusion distance

Active Publication Date: 2022-01-25
GUANGDONG BRUNP RECYCLING TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with the layered oxide Naa[NbMcQd which is easy to release oxygen and the crystal structure is easy to collapse during charge and discharge ]O2 type sodium ion positive electrode material compared (N, M, Q such as Ni, Cu, Ti, Mn and other elements, a, b, c, d between 0 to 1 Between), this type of positive electrode material (olivine-type NaFePO4 electrode material) has good structural stability and thermal stability, so it has good stability during charge and discharge; however, compared with Compared with LiFePO4(LFP) batteries of the same type, the NaFePO4 in olivine-type NaFePO4 has deficiencies such as larger radius of sodium ions and lower specific capacity, which lead to The cycle performance and discharge rate performance of ion batteries are poor, which has become the main factor restricting the application of olivine-type NaFePO4 materials

Method used

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  • Preparation method of layered carbon-doped sodium ferric phosphate positive electrode material
  • Preparation method of layered carbon-doped sodium ferric phosphate positive electrode material
  • Preparation method of layered carbon-doped sodium ferric phosphate positive electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] In this example, a layered carbon-doped sodium iron phosphate positive electrode material is prepared, and the specific process is as follows:

[0038](1) Ferronickel is crushed and ground into ferronickel powder, and mixed acid (the volume ratio of phosphoric acid and sulfuric acid is 30:30, H + About 14.5mol / L) leaching, the solid-liquid ratio of nickel-iron powder and mixed acid is 1:8.5g / ml, the leaching solution is nickel-iron salt solution, add 0.050mol / L sodium hydroxide to adjust pH=2.4 to obtain iron hydroxide precipitation, add Purify and remove impurities with dilute alkali to obtain ferric hydroxide, separate and dry for storage;

[0039] (2) Dissolve 3.83mol ferric hydroxide and 7.1L 0.30mol / L sulfuric acid, add 8.4mol iron powder and stir for reduction, then add 3.5L 1.21mol / L phosphoric acid to obtain ferrous phosphate precipitation, separate, purify, dry, anti-oxidation;

[0040] (3) Put 160g of superfine sodium carbonate powder in a high-temperature-r...

Embodiment 2

[0044] In this example, a layered carbon-doped sodium iron phosphate positive electrode material is prepared, and the specific process is as follows:

[0045] (1) Ferronickel is crushed and ground into ferronickel powder, and mixed acid (the volume ratio of phosphoric acid and sulfuric acid is 30:45, H + About 16.5mol / L) leaching, the solid-liquid ratio of nickel-iron powder and mixed acid is 1:8.8g / ml, the leaching solution is nickel-iron salt solution, add 0.20mol / L sodium hydroxide to adjust pH=2.7, pH=7.9 to obtain hydrogen respectively Precipitate iron oxide and nickel hydroxide, add dilute alkali to purify and remove impurities respectively, and obtain iron hydroxide and nickel hydroxide, which are stored in a dry place.

[0046] (2) Dissolve 4.73mol of ferric hydroxide and 6.7L of 0.60mol / L sulfuric acid, add 9.50mol of iron powder and stir for reduction, then add 3.5L of 1.0mol / L phosphoric acid to obtain ferrous phosphate precipitation, separate, purify, dry, anti-ox...

Embodiment 3

[0050] In this example, a layered carbon-doped sodium iron phosphate positive electrode material is prepared, and the specific process is as follows:

[0051] (1) Ferronickel is crushed and ground into ferronickel powder, and mixed acid (the volume ratio of phosphoric acid and sulfuric acid is 30:30, H + About 14.5mol / L) leaching, the solid-liquid ratio of nickel-iron powder and mixed acid is 1:10.0g / ml, the leaching solution is nickel-iron salt solution, add 0.050mol / L sodium hydroxide to adjust pH=2.6 to obtain iron hydroxide precipitation, add Purify and remove impurities with dilute alkali to obtain ferric hydroxide, separate and dry for storage;

[0052] (2) Dissolve 3.96mol ferric hydroxide and 4.5L 0.50mol / L sulfuric acid, add 8.4mol iron powder and stir for reduction, then add 3.5L 1.21mol / L phosphoric acid to obtain ferrous phosphate precipitation, separate, purify, dry, anti-oxidation;

[0053] (3) Put 140g of ultra-fine sodium carbonate powder in a high-temperatur...

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Abstract

The invention discloses a preparation method of a layered carbon-doped sodium ferric phosphate positive electrode material. The preparation method comprises the following steps: placing carbonate powder in an inert atmosphere, introducing a gaseous organic matter, carrying out heating reaction to prepare an MCO3 / C layered carbon material, mixing the MCO3 / C layered carbon material, a sodium source, ferrous phosphate and a dispersing agent in the inert atmosphere, then grinding, then washing and drying to remove the dispersing agent, and heating and reacting in an inert atmosphere to obtain the layered carbon-doped sodium ferric phosphate positive electrode material. Compared with a NaFePO4 positive electrode material synthesized without introduction of layered carbon, the layered carbon-doped NaFePO4 positive electrode material prepared by introduction of the MCO3 powder has the advantages of short sodium ion diffusion distance and higher transmission rate during charging and discharging of a battery, improvement of the phase transition of sodium ions in a sodium ion deintercalation process, improvement of the specific discharge capacity, and enhancement of the cyclic stability of the sodium ferric phosphate crystal structure.

Description

technical field [0001] The invention belongs to the technical field of sodium ion batteries, and in particular relates to a preparation method of a layered carbon-doped sodium iron phosphate cathode material. Background technique [0002] Lithium-ion batteries have been widely used in portable electronic consumer markets, new energy vehicles and other fields due to their advantages such as high energy density, high cycle times, and environmental protection. However, with the rapid growth of the new energy industry, there is a huge gap in the consumption demand of lithium-ion batteries. At this stage, due to problems such as the lack of lithium ore resources and the high price of lithium-ion materials, it has become an obstacle to the further expansion of production and application of lithium-ion batteries. And sodium is the second element of group IA in the periodic table of elements. After the element lithium, its physical and chemical properties are similar to the element ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M10/054
CPCH01M4/366H01M4/5825H01M4/583H01M10/054H01M2004/028Y02E60/10H01M4/5805C01B25/45C01B25/375C01P2006/40
Inventor 余海军钟应声李爱霞谢英豪张学梅李长东
Owner GUANGDONG BRUNP RECYCLING TECH
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