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Hexagonal ferric oxide/carbon negative electrode material and preparation method therefor

A technology of ferric oxide and carbon negative electrode materials, applied in battery electrodes, secondary batteries, electrochemical generators, etc., to achieve the effects of low reaction temperature, shortened transmission path, and short cycle

Active Publication Date: 2018-02-16
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when testing the assembled battery at a current of 100 mAh / g, the discharge capacity of the first 3 cycles is maintained above 800 mAh / g, and after 30 cycles, the specific capacity decays to 600 mAh / g. It shows that the cycle performance of the material still needs to be improved

Method used

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  • Hexagonal ferric oxide/carbon negative electrode material and preparation method therefor
  • Hexagonal ferric oxide/carbon negative electrode material and preparation method therefor
  • Hexagonal ferric oxide/carbon negative electrode material and preparation method therefor

Examples

Experimental program
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Effect test

Embodiment 1

[0040] (1) Mix 10mL deionized water and 30mL N,N-dimethylformamide evenly to obtain 40mL homogeneous solution;

[0041] (2) Add 4mmol ferric chloride hexahydrate and 4mmol fumaric acid to the 40mL homogeneous solution obtained in step (1), stir and dissolve evenly to obtain a mixed solution;

[0042] (3) Put the mixed solution obtained in step (2) in a polytetrafluoroethylene high-pressure reaction kettle, seal it, put it in a high-temperature drying oven, heat it at 140°C for 16 hours, cool it to room temperature naturally, filter it, and use it without Water, ethanol and deionized water were used to cross-wash the filtrate 4 times respectively, and dry in an oven at 60°C for 24 hours to obtain a yellow powder;

[0043] (4) Calcining the yellow powder obtained in step (3) at 400° C. for 6 hours in a high-purity argon atmosphere, and naturally cooling to room temperature to obtain a hexagonal ferric oxide / carbon negative electrode material.

[0044] Such as figure 1 As shown...

Embodiment 2

[0050] (1) Mix 5 mL of deionized water and 35 mL of N,N-dimethylformamide evenly to obtain 40 mL of a homogeneous solution;

[0051] (2) Add 8 mmol of ferric nitrate nonahydrate and 2 mmol of terephthalic acid to 40 mL of the homogeneous solution obtained in step (1), stir and dissolve evenly to obtain a mixed solution;

[0052] (3) Put the mixed solution obtained in step (2) in a polytetrafluoroethylene high-pressure reaction kettle, seal it, put it in a high-temperature drying oven, heat it at 160°C for 10 hours, cool it to room temperature naturally, filter it, and use it without Water, ethanol and deionized water were respectively cross-washed and filtered 4 times, and dried in an oven at 100°C for 12 hours to obtain a yellow powder;

[0053] (4) Calcining the yellow powder obtained in step (3) at 600° C. for 4 hours in a high-purity nitrogen atmosphere, and naturally cooling to room temperature to obtain a hexagonal ferric oxide / carbon negative electrode material.

[005...

Embodiment 3

[0060] (1) Mix 8 mL deionized water and 32 mL N,N-dimethylformamide evenly to obtain 40 mL homogeneous solution;

[0061] (2) Add 0.4mmol ferric nitrate nonahydrate and 0.8mmol 3,5-diaminobenzoic acid to the 40mL homogeneous solution obtained in step (1), stir and dissolve evenly to obtain a mixed solution;

[0062] (3) Put the mixed solution obtained in step (2) in a polytetrafluoroethylene high-pressure reaction kettle, seal it, put it in a high-temperature drying oven, heat it at 100°C for 24 hours, cool it to room temperature naturally, filter it, and use it without Water, ethanol and deionized water were respectively cross-washed and filtered 4 times, and dried in an oven at 60°C for 24 hours to obtain a yellow powder;

[0063] (4) Calcining the yellow powder obtained in step (3) at 400° C. for 6 hours in a high-purity nitrogen atmosphere, and naturally cooling to room temperature to obtain a hexagonal ferric oxide / carbon negative electrode material.

[0064] It has been...

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Abstract

The invention discloses a hexagonal ferric oxide / carbon negative electrode material and a preparation method therefor. The negative electrode material is prepared by the steps of (1) performing uniform mixing on water and N, N-dimethyl formamide to obtain a uniform solution; (2) adding an iron source and an organic ligand and performing stirring to obtain a mixed solution; (3) performing sealing,a heating reaction, cooling, filtering, washing and drying to obtain yellow powder; and (4) performing roasting and cooling in an inert atmosphere. The negative electrode material obtained in the invention is 3-5[mu]m in grain diameter and is a mesoporous material; when the negative electrode material is assembled into a battery, the initial charging specific capacity can reach 923.5mAh.g<-1> at 0.01-3V and 100mA.g<-1>; after 200 cycles, the capacity retention ratio can be greater than or equal to 95%; the initial discharging specific capacity can reach 1,368.8mAh.g<-1>; in the charging and discharging processes, low volume expansion, high conductivity, stable charging and discharging performance and high cycle performance are achieved; and the method is simple, low in reaction temperature, short in period and low in cost.

Description

technical field [0001] The invention relates to a negative electrode material and a preparation method thereof, in particular to a hexagonal ferric oxide / carbon negative electrode material for a lithium ion battery and a preparation method thereof. Background technique [0002] With the needs of social development, people's requirements for energy storage equipment are increasing day by day, and lithium-ion batteries have attracted much attention as the current mainstream equipment. Due to the high theoretical specific capacity (1009 mAh g -1 ), and has attracted much attention because of its environmental friendliness. However, due to the large volume change of the Fe2O3 negative electrode material during charging and discharging, it is easy to be crushed, and its conductivity is poor. [0003] CN106953093A discloses a colloidal core-shell structure α-Fe 2 o 3 The method for preparing lithium-ion battery anodes from materials is to use glycine as a structure-directing a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/525H01M4/625H01M10/0525Y02E60/10
Inventor 童汇姚赢赢张宝董鹏远陈核章王旭郑俊超喻万景张佳峰
Owner CENT SOUTH UNIV
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