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Preparation method of sodium ferric pyrophosphate electrode material coated with metal oxide, product and application of sodium ferric pyrophosphate electrode material

A technology of sodium iron pyrophosphate and electrode material, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of toxicity, incompatibility with sodium-ion battery system, expensive vanadium resources, etc., and achieves low pyrolysis treatment temperature and intrinsic Increased ion diffusivity, effect of green process flow

Pending Publication Date: 2022-07-05
SOUTHWEST UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current research on polyanions is mainly concentrated on vanadium-based materials, such as sodium vanadium fluorophosphate / sodium vanadyl fluorophosphate and other materials, which have the advantage of high specific capacity, but because vanadium resources are relatively expensive, and the oxidation of vanadium and vanadium The substance is toxic and has certain limitations in large-scale applications, and it does not meet the starting point of developing a low-cost sodium-ion battery system.

Method used

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  • Preparation method of sodium ferric pyrophosphate electrode material coated with metal oxide, product and application of sodium ferric pyrophosphate electrode material
  • Preparation method of sodium ferric pyrophosphate electrode material coated with metal oxide, product and application of sodium ferric pyrophosphate electrode material
  • Preparation method of sodium ferric pyrophosphate electrode material coated with metal oxide, product and application of sodium ferric pyrophosphate electrode material

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Experimental program
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Embodiment 1

[0043] A manganese dioxide-coated sodium iron pyrophosphate (Na 7 Fe 4.5 (P 2 O 7 ) 4 @MnO 2 ) electrode material, and the specific method specifically includes the following steps:

[0044] (1) Sodium acetate, ferrous oxalate dihydrate, concentration is 1moL -1 Phosphoric acid is mixed to obtain mixture (wherein the mol ratio of the sodium in sodium acetate, the iron in ferrous oxalate dihydrate and the phosphate radical in phosphoric acid is 7:4.5:8) after adding the ball mill tank, and adding alcohol (the alcohol quality added is 200% of the mass of the mixture) as a dispersing solvent, add agate beads (the mass of the agate beads added is 300% of the mass of the mixture) as a grinding medium, carry out ball milling, and the product obtained after the ball milling is a pale yellow homogenate, and the homogenate and the agate beads are mixed together. Separation is carried out through a screen, and then the separated homogenate is dried to obtain a sodium ferric pyroph...

Embodiment 2

[0051] A nickel oxide-coated sodium ferric pyrophosphate (Na 8 Fe 5 (P 2 O 7 ) 4.5 @NiO electrode material, the specific method includes the following steps:

[0052] (1) mix sodium carbonate, ferrous chloride and ammonium dihydrogen phosphate to form a mixture (wherein the molar ratio of sodium in sodium carbonate, iron in ferrous chloride and phosphate in ammonium dihydrogen phosphate is 8:5 : 9) After adding the ball mill tank, and adding alcohol (the added alcohol mass is 200% of the mixture mass) as a dispersing solvent, adding zirconia beads (the added zirconia bead mass is 300% of the mixture mass) as a grinding medium, carry out Ball milling, the product obtained after the ball milling is a pale yellow homogenate, the homogenate and the agate beads are separated together through a screen, and then the separated homogenate is dried to obtain a sodium ferric pyrophosphate precursor (p-(Na). 8 Fe 5 (P 2 O 7 ) 4.5 );

[0053] (2) the above-prepared sodium iron py...

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Abstract

The invention relates to a preparation method of a metallic oxide coated sodium ferric pyrophosphate electrode material, a product and application thereof, and belongs to the technical field of electrode material preparation. The metallic oxide-coated sodium ferric pyrophosphate electrode material comprises sodium ferric pyrophosphate and a metallic oxide coated on the surface of the sodium ferric pyrophosphate, a simple continuous ball milling method is used as a synthesis method, the process is simple and easy to copy and amplify, and after the sodium ferric pyrophosphate is coated with the metallic oxide on the surface, the sodium ferric pyrophosphate can be used for preparing the metallic oxide-coated sodium ferric pyrophosphate electrode material. The stability of the material is further improved, the intrinsic ion diffusivity of the material is also obviously improved, the first effect reaches 88% or above, the specific capacity per gram can reach 107 mA h g <-1 >, the capacity retention rate exceeds 90% after 200 cycles, and the electrochemical performance is close to that of other polyanion materials. Therefore, the material is beneficial to large-current charging and discharging and long-time cycle application in a sodium-ion battery material.

Description

technical field [0001] The invention belongs to the technical field of electrode material preparation, and relates to a preparation method, product and application of a metal oxide-coated sodium iron pyrophosphate electrode material. Background technique [0002] With the rapid development of society, people's demand for energy is increasing. From the actual point of view in my country, although the total oil / natural gas reserves are ranked in the top 10 in the world, the lack of per capita energy resources is a key factor hindering the rapid development of my country. Therefore, the development of Renewable clean energy becomes a necessity. Na-ion batteries, also known as sodium batteries, are similar in form and structure to lithium-ion batteries and are a new type of energy storage medium. conversion between. Compared with lithium-ion batteries, sodium-ion batteries have the advantage of being extremely rich in sodium resources and their distribution is not restricted by...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/48H01M10/054
CPCH01M4/366H01M4/5825H01M4/483H01M10/054H01M2004/028Y02E60/10
Inventor 岳亮徐茂文戚钰若雷雨司李杰李连接
Owner SOUTHWEST UNIVERSITY
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