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Preparation method of ferric pyrophosphate and application of ferric pyrophosphate in sodium-ion batteries

A technology of sodium ferric pyrophosphate and phosphoric acid, applied in the directions of phosphate, phosphorus oxyacid, secondary battery, etc., can solve the problem of high rate performance, poor cycle life and poor conductivity, poor repeatability, difficult to achieve large-scale production, phase purity It can achieve the effect of uniform morphology, excellent cycle stability and high surface electrochemical activity.

Active Publication Date: 2017-01-18
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In most of the preparation methods, solid-phase ball milling method alone can realize large-scale industrial production, but the prepared materials have poor morphology and low phase purity, resulting in high rate performance, cycle life and conductivity. are poor
Hydrothermal preparation of Na 2 FeP 2 o 7 High temperature and high pressure equipment is required, the preparation process is complicated, and the repeatability is difficult to achieve large-scale production.

Method used

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  • Preparation method of ferric pyrophosphate and application of ferric pyrophosphate in sodium-ion batteries

Examples

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Embodiment 1

[0038] 1) In this example, 0.03 mol of the target product, sodium ferric pyrophosphate, is designed, and 0.03 mol of ferrous oxide is added to 6.92 g of phosphoric acid (85% in mass concentration), stirred for 3 days at 200° C., and the obtained white powder is obtained by using acetone After washing three times, filter and dry to obtain FeH 2 P 2 o 7,From Figure 4 It can be seen that the obtained product is pure phase FeH 2 P 2 o 7 .

[0039] 2) Combine 0.0315mol sodium oxalate with the FeH obtained in the above steps 2 P 2 o 7 Mixed uniformly by high-energy ball milling to obtain the precursor of sodium ferric pyrophosphate;

[0040] 3) The precursor is placed in a hydrogen-argon mixed gas atmosphere, heated at 5°C / min to 580°C for sintering for 9 hours, and naturally cooled to room temperature to obtain the sodium iron pyrophosphate material.

[0041] The sodium ion battery composite positive electrode material prepared in this example is assembled into a button ...

Embodiment 2

[0047] This embodiment includes the following steps:

[0048] (1) This embodiment is designed to generate 0.03 mol of the target product, sodium ferric pyrophosphate, and 0.03 mol of ferrous oxide is added to 6.92 g of phosphoric acid (85% by mass), and stirred at 220°C for 3 days to obtain a white powder After washing three times with acetone, it was filtered and dried to obtain FeH 2 P 2 o 7 ;

[0049] 2) Combine 0.0315mol sodium oxalate with the FeH obtained in the above steps 2 P 2 o 7 Mixed uniformly by high-energy ball milling to obtain the precursor of sodium ferric pyrophosphate;

[0050] 3) The precursor is placed in a hydrogen-argon mixed gas atmosphere, heated at 5°C / min to 580°C for sintering for 9 hours, and naturally cooled to room temperature to obtain the sodium iron pyrophosphate material.

[0051] The battery assembly and testing methods of the materials obtained in this example are the same as those in Example 1, and the average particle size of the p...

Embodiment 3

[0053] This embodiment includes the following steps:

[0054] 1) This embodiment is designed to generate 0.03 mol of the target product, sodium ferric pyrophosphate, and 0.03 mol of ferrous oxide is added to 6.92 g of phosphoric acid (85% concentration by mass), and stirred for 5 days at 200° C., and the obtained white powder is obtained by After washing with acetone three times, filter and dry to obtain FeH 2 P 2 o 7 ;

[0055] 2) Combine 0.0315mol sodium oxalate with the FeH obtained in the above steps 2 P 2 o 7 Mixed uniformly by high-energy ball milling to obtain the precursor of sodium ferric pyrophosphate;

[0056] 3) The precursor is placed in a hydrogen-argon mixed gas atmosphere, heated at 5°C / min to 580°C for sintering for 9 hours, and naturally cooled to room temperature to obtain the sodium iron pyrophosphate material.

[0057] The battery assembly and test method of the material obtained in this example are the same as in Example 1. The average particle siz...

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Abstract

The invention discloses a preparation method of ferric pyrophosphate and application of the ferric pyrophosphate in sodium-ion batteries. The preparation method of the ferric pyrophosphate comprises two steps that FeH2P2O7 is firstly prepared through a liquid phase method and is evenly mixed with a sodium source, and then calcination is performed to obtain the ferric pyrophosphate. The method is simple in process, facilitates large-scale production, the prepared ferric pyrophosphate is uniform in particle size distribution, low in impurity content and superior in electrochemical performance and can serve as an anode material for preparing high-performance sodium-ion batteries.

Description

technical field [0001] The invention relates to a sodium iron pyrophosphate material, in particular to a preparation method of the sodium iron pyrophosphate material and its application as a positive electrode material of a sodium ion battery; it belongs to the field of sodium ion batteries. Background technique [0002] Since the commercial production of lithium-ion batteries, lithium-ion batteries have been widely used in various fields, and have an absolute advantage in the field of mobile energy storage. However, due to the shortage of lithium metal resources in the world, large-scale energy storage fields such as electric vehicles and energy storage power stations require a large amount of raw materials, and the manufacturing cost of lithium-ion batteries is on the rise. In the field of energy storage, there is an urgent need for secondary batteries with excellent performance and low price to replace the current energy storage batteries. Sodium, which is in the same ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/525H01M10/054C01B25/45C01B25/26C01B25/37C01B25/42
CPCC01B25/265C01B25/375C01B25/425C01B25/45H01M4/525H01M4/58H01M10/054Y02E60/10
Inventor 张治安陈晓彬宋俊肖赖延清李劼
Owner CENT SOUTH UNIV
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