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Preparation method and application of carbon-coated ferrous borate with core-shell structure

A technology of carbon-coated ferrous borate and core-shell structure, applied in structural parts, nanotechnology for materials and surface science, electrical components, etc., can solve the problems of negative electrode materials restricting practical applications, and achieve excellent application prospects. The effect of high purity and excellent cycle stability

Active Publication Date: 2019-11-15
FUJIAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the practical application of sodium-ion batteries is restricted due to the lack of suitable anode materials, and the development of anode materials with excellent performance is currently a research hotspot and focus in this field.

Method used

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  • Preparation method and application of carbon-coated ferrous borate with core-shell structure
  • Preparation method and application of carbon-coated ferrous borate with core-shell structure
  • Preparation method and application of carbon-coated ferrous borate with core-shell structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) Dissolve 0.8 g of ferric nitrate, 0.1 g of boric acid and 2 g of citric acid in 40 ml of deionized water, and stir magnetically for 2 h;

[0019] (2) Put the solution obtained in step (1) into a constant temperature drying oven, and react at a constant temperature of 100 °C for 12 hours to obtain a gel;

[0020] (3) Put the gel obtained in step (2) into a muffle furnace, anneal at 600 °C for 6 h to obtain a brown powder, and then grind for 6 h;

[0021] (4) Disperse the brownish-yellow powder ground in step (3) into 50 ml of 15 mM tris-hydroxymethylaminomethane solution, sonicate for 1 h, then add dopamine hydrochloride, stir for 5 h, wash with deionized water and ethanol After ultrasonic cleaning 3 times, dry at 60 °C;

[0022] (5) Put the powder obtained in step (4) into a tube furnace, and keep it warm at 400 °C for 5 h in an Ar atmosphere to prepare the carbon-coated ferrous borate ((FeO) 2 FeBO 3 @C);

[0023] (6) Assembly of sodium ion battery: according t...

Embodiment 2

[0025] (1) Dissolve 1.2 g of ferric nitrate, 0.3 g of boric acid and 4 g of citric acid in 70 ml of deionized water, and stir magnetically for 5 h;

[0026] (2) Put the solution obtained in step (1) into a constant temperature drying oven, and react at a constant temperature of 100-200 ℃ for 8-12 hours to obtain a gel;

[0027] (3) Put the gel obtained in step (2) into a muffle furnace, anneal at 800 °C for 2 h to obtain a brown-yellow powder, and then grind for 20 h;

[0028] (4) Disperse the brownish-yellow powder after grinding in step (3) into 100 ml of 5 mM tris-hydroxymethylaminomethane solution, sonicate for 5 h, then add dopamine hydrochloride, stir for 20 h, wash with deionized water and ethanol After ultrasonic cleaning several times, dry at 60 °C;

[0029] (5) Put the powder obtained in step (4) into a tube furnace, and keep it warm at 700°C for 2 h in an Ar atmosphere to prepare the carbon-coated ferrous borate ((FeO) 2 FeBO 3 @C);

[0030] (6) Assembly of sodi...

Embodiment 3

[0032] (1) Dissolve 1.0 g of ferric nitrate, 0.2 g of boric acid and 3 g of citric acid in 55 ml of deionized water, and stir magnetically for 3.5 hours;

[0033] (2) Put the solution obtained in step (1) into a constant temperature drying oven, and react at a constant temperature of 150 °C for 10 h to obtain a gel;

[0034] (3) Put the gel obtained in step (2) into a muffle furnace, anneal at 700 °C for 4 h to obtain a brown-yellow powder, and then grind for 13 h;

[0035] (4) Disperse the brownish-yellow powder ground in step (3) into 75 ml of 10 mM tris-hydroxymethylaminomethane solution, sonicate for 3 h, then add dopamine hydrochloride, stir for 12 h, wash with deionized water and ethanol After ultrasonic cleaning several times, dry at 60 °C;

[0036] (5) Put the powder obtained in step (4) into a tube furnace, and keep it warm at 550°C for 3.5 h in an Ar atmosphere to prepare the carbon-coated ferrous borate ((FeO) 2 FeBO 3 @C);

[0037] (6) Assembly of sodium ion ba...

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Abstract

The invention discloses a preparation method and application of carbon-coated ferrous borate with a core-shell structure. Ferric nitrate, boric acid and citric acid are used as raw materials and subjected to constant temperature reaction at 100 to 200 DEG C for 8 to 12 hours to acquire gel. Annealing and dispersing in a trimethylolaminomethane solution are carried out. Dopamine hydrochloride is added. Finally, calcination is carried out in an Ar atmosphere to acquire carbon-coated ferrous borate with the core-shell structure. The carbon-coated ferrous borate with the core-shell structure, which is prepared by the invention, is used in a sodium ion battery, exhibits relatively high specific capacity and excellent cycle stability, and has excellent application prospects in a low-cost high-performance sodium ion battery.

Description

technical field [0001] The invention belongs to the technical field of electrode material preparation, and in particular relates to a preparation method and application of carbon-coated ferrous borate with a core-shell structure. Background technique [0002] Sodium is one of the most abundant elements on the earth, and its chemical properties are similar to lithium, so sodium-ion batteries and lithium-ion batteries also show many similarities. Compared with lithium-ion batteries, sodium-ion batteries have many advantages, such as low cost and good safety. With the deepening of research, sodium-ion batteries are becoming more and more cost-effective, and are expected to replace lithium-ion batteries in the future and be widely used. At present, the practical application of sodium-ion batteries is restricted due to the lack of matching suitable anode materials, and the development of anode materials with excellent performance is currently a research hotspot and focus in this ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/054B82Y30/00
CPCH01M4/366H01M4/5825H01M4/625H01M10/054B82Y30/00Y02E60/10
Inventor 洪振生陈扬周凯强黄志高
Owner FUJIAN NORMAL UNIV
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