Unlock instant, AI-driven research and patent intelligence for your innovation.

A kind of sodium ion battery positive electrode na 2+2x fe 2‑x (so 4 ) 3 @Carbon composite material and preparation method thereof

A technology of carbon composite materials and sodium-ion batteries, applied in battery electrodes, batteries, positive electrodes, etc., can solve the problems of low ion diffusion coefficient and poor electronic conductivity, achieve high ion diffusion coefficient, increase electronic conductivity, and electronic conductivity sex high effect

Active Publication Date: 2017-12-15
CENT SOUTH UNIV
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, Na 2+2x Fe 2-x (SO 4 ) 3 There are disadvantages such as poor electronic conductivity and low ion diffusion coefficient, so how to improve the conductivity of the material has become a Na 2+2x Fe 2-x (SO 4 ) 3 As the key to the research of cathode materials for sodium-ion batteries

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A kind of sodium ion battery positive electrode na <sub>2+2x</sub> fe <sub>2‑x</sub> (so <sub>4</sub> ) <sub>3</sub> @Carbon composite material and preparation method thereof
  • A kind of sodium ion battery positive electrode na <sub>2+2x</sub> fe <sub>2‑x</sub> (so <sub>4</sub> ) <sub>3</sub> @Carbon composite material and preparation method thereof
  • A kind of sodium ion battery positive electrode na <sub>2+2x</sub> fe <sub>2‑x</sub> (so <sub>4</sub> ) <sub>3</sub> @Carbon composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Weigh 0.142g sodium sulfate (Na 2 SO 4 ), 0.276g ferrous sulfate heptahydrate (FeSO 4 ·7H 2 O) and 0.176g of antioxidants were added to 40ml of deionized water, stirred by magnetic force for 10min to fully dissolve, then transferred to a high-pressure reactor, and heated to 180°C at a rate of 2°C / min to carry out hydrothermal reaction for 12h, after cooling centrifuged and dried to obtain Na 2 Fe(SO 4 ) 2 4H 2 O@carbon composites.

[0031] Na 2 Fe(SO 4 ) 2 4H 2 The O@carbon composite material is placed in a tube furnace protected by an inert atmosphere, and heated at a rate of 1 °C / min to 350 °C for 24 hours at a high temperature to obtain Na 2+2x Fe 2-x (SO 4 ) 3 @carboncomposites.

[0032] The sodium battery composite positive electrode material prepared in this example and the sodium sheet were assembled into a button battery, and its material characterization and electrochemical performance are shown in the figure:

[0033] figure 1 showed that the ...

Embodiment 2

[0038] Weigh 0.142g sodium sulfate (Na 2 SO 4 ), 0.276g ferrous sulfate heptahydrate (FeSO 4 ·7H 2 O) and 0.176g of antioxidants were added to 40ml of deionized water, stirred by magnetic force for 10min to fully dissolve, then transferred to an autoclave, and heated to 200°C at a rate of 5°C / min for 6h of hydrothermal reaction, after cooling centrifuged and dried to obtain Na 2 Fe(SO 4 ) 2 4H 2 O@carbon composites.

[0039] Na 2 Fe(SO 4 ) 2 4H 2 The O@carbon composite material is placed in a tube furnace protected by an inert atmosphere, and heated at a rate of 1 °C / min to 400 °C for 24 hours at a high temperature to obtain Na 2+2x Fe 2-x (SO 4 ) 3 @carboncomposites.

[0040] Gained Na 2+2x Fe 2-x (SO 4 ) 3 @Carbon composite particle size is about 260nm, carbon layer thickness is about 10nm. The positive electrode composite material prepared in this example and the sodium sheet are assembled into a button battery. When discharged at a constant current of 1...

Embodiment 3

[0042] Weigh 0.142g sodium sulfate (Na 2 SO 4 ), 0.276g ferrous sulfate heptahydrate (FeSO 4 ·7H 2 O) and 0.200g of antioxidant were added to 40ml of deionized water, stirred by magnetic force for 10min until fully dissolved, then transferred to an autoclave, heated to 150°C at a rate of 5°C / min for hydrothermal reaction for 12h, after cooling centrifuged and dried to obtain Na 2 Fe(SO 4 ) 2 4H 2 O@carbon composites.

[0043] Na 2 Fe(SO 4 ) 2 4H 2 The O@carbon composite material is placed in a tube furnace protected by an inert atmosphere, and heated at a rate of 1 °C / min to 400 °C for 24 hours at a high temperature to obtain Na 2+2x Fe 2-x (SO 4 ) 3 @carbon composites.

[0044] Gained Na 2+2x Fe 2-x (SO 4 ) 3 The particle size of @carbon composite material is about 200nm, and the thickness of the carbon layer is about 20nm. The positive electrode composite material prepared in this example and the sodium sheet are assembled into a button battery. When disc...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
particle diameteraaaaaaaaaa
thicknessaaaaaaaaaa
Login to View More

Abstract

The invention discloses a sodium-ion battery positive pole Na2+2xFe2-x(SO4)3@ carbon composite material and a preparing method thereof. The composite material is formed by coating the surfaces of Na2+2xFe2-x(SO4)3 particles with a carbon material layer and is of a core-shell structure, wherein x is 1-2; the preparing method comprises the steps that a water solution containing sodium sulfate, ferrous sulfate and organic antioxidant is subjected to a hydrothermal reaction at first to obtain a Na2+2xFe2-x(SO4)3@ carbon composite material precursor; the precursor is placed in protective atmosphere and roasted at high temperature to obtain the composite material. The preparing method is simple, low in cost and environmentally friendly, and the prepared Na2+2xFe2-x(SO4)3@ carbon composite material can be used for preparing sodium-ion batteries with high specific capacity, high working voltage, good rate capacity and long cycle life.

Description

technical field [0001] The present invention relates to a kind of sodium ion battery positive pole Na 2+2x Fe 2-x (SO 4 ) 3 @Carbon composite materials and their preparation methods belong to the field of sodium-ion batteries. Background technique [0002] Lithium-ion batteries are currently the dominant electrochemical energy storage system. With the rapid popularization of mobile devices such as personal computers, cameras, and mobile phones, and their good application prospects in electric vehicles and hybrid vehicles, the demand for lithium-ion batteries keep growing. However, difficulties in lithium extraction and limited reserves have become bottlenecks in mass production and large-scale commercialization. Sodium-ion batteries have attracted extensive attention due to their rich reserves of sodium resources and environmental friendliness. The research and development of sodium-ion batteries can alleviate the limited development of batteries caused by the shortage ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M4/136H01M4/1397H01M10/54
CPCH01M4/136H01M4/1397H01M4/366H01M4/5825H01M4/625H01M4/628H01M10/54H01M2004/028H01M2220/20Y02E60/10Y02W30/84
Inventor 张治安赵星星李劼张娟赖延清张凯
Owner CENT SOUTH UNIV