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Three-dimensional C/Fe3O4 lithium ion battery negative electrode material and preparation method thereof

A technology for lithium ion batteries and negative electrode materials, applied in battery electrodes, secondary batteries, nanotechnology for materials and surface science, etc., can solve the problems of large volume change and poor conductivity of negative electrode materials, and improve adsorption performance. , Improve the binding ability, promote the effect of load

Active Publication Date: 2020-10-13
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Based on the technical problems existing in the background technology, the present invention proposes a three-dimensional C / Fe 3 o 4 Lithium-ion battery negative electrode material and preparation method thereof, the purpose is to improve Fe 3 o 4 Due to the disadvantages of poor electrical conductivity of negative electrode materials and large volume changes in the cycle, the improvement of Fe 3 o 4 Electrochemical performance of the negative electrode

Method used

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  • Three-dimensional C/Fe3O4 lithium ion battery negative electrode material and preparation method thereof
  • Three-dimensional C/Fe3O4 lithium ion battery negative electrode material and preparation method thereof
  • Three-dimensional C/Fe3O4 lithium ion battery negative electrode material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Preparation of citric acid modified bacterial cellulose:

[0027] Dissolve 3.84g of citric acid in 200mL of water to prepare an aqueous solution of citric acid, then add 5g of bacterial cellulose with a diameter of 40-60nm into the aqueous solution of citric acid and stir at 20°C for 30 minutes, then wash until the pH is 6-7. After drying, the citric acid modified bacterial cellulose was obtained.

[0028] Preparation of three-dimensional C / Fe 3 o 4 Lithium-ion battery anode materials:

[0029] S1, 1.35g FeCl 3 ·6H 2 O was dissolved in 20mL water to prepare FeCl 3 ·6H 2 O aqueous solution, then add 5g of the above-mentioned citric acid-modified bacterial cellulose to FeCl 3 ·6H 2 In the aqueous solution of O, soak at 30°C for 5 hours, then filter and dry, and repeat the soaking, filtering and drying twice;

[0030] S2. Raise the material obtained in step S1 to 300°C at a rate of 3°C / min in a nitrogen atmosphere, keep it warm for 1h, and obtain a three-dimension...

Embodiment 2

[0032] Preparation of citric acid modified bacterial cellulose:

[0033] Dissolve 11.52g of citric acid in 200mL of water to prepare an aqueous solution of citric acid, then add 5g of bacterial cellulose with a diameter of 40-60nm into the aqueous solution of citric acid and stir at 80°C for 60min, then wash until the pH is 6-7. After drying, the citric acid modified bacterial cellulose was obtained.

[0034] Preparation of three-dimensional C / Fe 3 o 4 Lithium-ion battery anode materials:

[0035] S1, 33.83g FeCl 3 ·6H 2 O was dissolved in 100mL water to prepare FeCl 3 ·6H 2 O aqueous solution, then add 5g of the above-mentioned citric acid-modified bacterial cellulose to FeCl 3 ·6H 2 In the aqueous solution of O, soak at 40°C for 8 hours, then filter and dry, repeat the soak, filter and dry for 3 times;

[0036] S2. Raise the material obtained in step S1 to 500°C at a heating rate of 6°C / min in a nitrogen atmosphere, keep it warm for 3 hours, and obtain a three-dimen...

Embodiment 3

[0038] Preparation of citric acid modified bacterial cellulose:

[0039] Dissolve 10g of citric acid in 200mL of water to prepare an aqueous solution of citric acid, then add 5g of bacterial cellulose with a diameter of 40-60nm into the aqueous solution of citric acid and stir at 60°C for 40min, then wash until the pH is 6-7, and dry After drying, the citric acid modified bacterial cellulose was obtained.

[0040] Preparation of three-dimensional C / Fe 3 o 4Lithium-ion battery anode materials:

[0041] S1, first 13.5g FeCl 3 ·6H 2 O was dissolved in 50mL water to prepare FeCl 3 ·6H 2 O aqueous solution, then add 5g of the above-mentioned citric acid-modified bacterial cellulose to FeCl 3 ·6H 2 In the aqueous solution of O, soak at 35°C for 6 hours, then filter and dry, and repeat the soaking, filtering and drying twice;

[0042] S2. Raise the material obtained in step S1 to 400°C at a rate of 5°C / min in a nitrogen atmosphere, keep it warm for 2 hours, and obtain a thre...

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Abstract

The invention discloses a three-dimensional C / Fe3O4 lithium ion battery negative electrode material and a preparation method thereof, and the three-dimensional C / Fe3O4 lithium ion battery negative electrode material is prepared by taking cellulose as a template and ferric salt as a precursor, firstly loading iron ions on the template through dipping treatment, and then carrying out calcining treatment in an inert atmosphere. The three-dimensional C / Fe3O4 lithium ion battery negative electrode material prepared by the invention can overcome the defects of poor conductivity and large volume change in circulation of the Fe3O4 negative electrode material, and can greatly improve the electrochemical performance of the Fe3O4 negative electrode.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery negative electrode materials, in particular to a three-dimensional C / Fe 3 o 4 Lithium-ion battery negative electrode material and preparation method thereof. Background technique [0002] Compared with carbon materials, transition metal oxides (MxOy, M=Fe, Co, Cu, Ti) as lithium-ion battery anode materials have higher theoretical capacity, better safety performance and rate performance, and have attracted people's attention. where Fe 3 o 4 It is because of its high theoretical capacity (927mAhg -1) , the highest electron conductivity (σ=2×10 4 S / m, superior to other transition metal oxides), rich in resources, non-toxic, environmentally friendly, good corrosion resistance and low cost, etc., are favored. However, Fe 3 o 4 The drastic volume change (>200%) during the charge and discharge process makes it pulverize, fall off, agglomerate, etc., and even lose electrical contact...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/52H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCH01M4/362H01M4/523H01M4/62H01M4/625H01M4/628H01M10/0525B82Y30/00B82Y40/00Y02E60/10
Inventor 毕超奇林少雄蔡桂凡石永倩梁栋栋王健王叶
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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