Expanded graphite anode material supporting willow-leaf-like iron (II,III) oxide and preparation method of expanded graphite anode material

A technology of triiron tetroxide and expanded graphite is applied in the field of material preparation and expanded graphite negative electrode material, which can solve the problems of poor charge-discharge cycle performance and insufficient energy density, and achieve good charge-discharge cycle performance, good electrical conductivity and good electrical conductivity. The effect of thermal and electrical conductivity

Active Publication Date: 2018-07-27
DONGGUAN KAIJIN NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the technical problems of insufficient energy density and poor charge-discharge cycle performance of lithium battery negative electrode materials in the prior art. The present invention provides a novel lithium battery negative electrode material and a preparation method thereof. The negative electrode material has Special morphology, that is, the ferric oxide supported on the surface of expanded graphite has a willow-like structure

Method used

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  • Expanded graphite anode material supporting willow-leaf-like iron (II,III) oxide and preparation method of expanded graphite anode material
  • Expanded graphite anode material supporting willow-leaf-like iron (II,III) oxide and preparation method of expanded graphite anode material
  • Expanded graphite anode material supporting willow-leaf-like iron (II,III) oxide and preparation method of expanded graphite anode material

Examples

Experimental program
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Effect test

Embodiment 1

[0035] S1: Immerse the expanded graphite in water and stir for 10 minutes to obtain a 5g / L expanded graphite suspension;

[0036] S2: prepare 1mol / L ferric salt-containing solution, then add structure directing agent polyvinyl dimethyl ammonium chloride to the ferric salt solution, and dissolve; the added amount of the structure directing agent is the same as The mass ratio of ferric iron is 5:1;

[0037] S3: Slowly add 32.4 mL of the ferric salt solution containing the structure directing agent into 1 L of the expanded graphite suspension, and the addition is completed within 1 min;

[0038] S4: Heating the expanded graphite suspension treated in S3 to reflux for 0.5h, and cooling to room temperature;

[0039] S5: Dissolve 0.408g of sodium borohydride and 3.889g of sodium hydroxide in 20mL of water, then add dropwise to the suspension treated in S4, and stir for 2 hours to prepare a composite material containing iron oxide and expanded graphite;

[0040] S6: Filtrate and wa...

Embodiment 2

[0043] S1: Immerse the expanded graphite in water and stir for 30 minutes to obtain a 10g / L expanded graphite suspension;

[0044] S2: prepare 2mol / L ferric salt-containing solution, then add structure directing agent polyvinyl dimethyl ammonium chloride to the ferric salt solution, and dissolve; the added amount of the structure directing agent is the same as The mass ratio of ferric iron is 10:1;

[0045] S3: Slowly add 16.2 mL of ferric salt-containing solution containing structure directing agent dropwise to 1 L of expanded graphite suspension, and the dropwise addition is completed within 30 seconds;

[0046] S4: Heating the expanded graphite suspension treated in S3 to reflux for 1 h, and cooling to room temperature;

[0047] S5: 0.408g of sodium borohydride and 5.184g of sodium hydroxide were dissolved in 20mL of water, and then added dropwise to the suspension treated in S4, and stirred for 3 hours to prepare a composite material containing iron oxide and expanded gra...

Embodiment 3

[0051] S1: Immerse expanded graphite in water and stir for 1 hour to obtain a 15g / L expanded graphite suspension;

[0052] S2: prepare 5mol / L ferric salt-containing solution, then add structure directing agent polyvinyl dimethyl ammonium chloride to the ferric salt solution, and dissolve; the added amount of the structure directing agent is the same as The mass ratio of ferric iron is 15:1;

[0053] S3: Slowly add 6.5 mL of ferric salt-containing solution containing the structure directing agent dropwise into 1 L of expanded graphite suspension, and the dropwise addition is completed within 20 seconds;

[0054] S4: Heating the expanded graphite suspension treated in S3 to reflux for 1.5h, and cooling to room temperature;

[0055] S5: Dissolve 0.408g of sodium borohydride and 6.48g of sodium hydroxide in 20mL of water, then add dropwise to the suspension treated in S4, and stir for 4 hours to prepare a composite material containing iron oxide and expanded graphite;

[0056] S...

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Abstract

The invention discloses an expanded graphite anode material supporting willow-leaf-like iron (II,III) oxide and a preparation method of the expanded graphite anode material. The preparation method mainly comprises the following steps: (1) dispersing expanded graphite; (2) preparing a mixed solution of an iron salt and a structure-directing agent; (3) dropwise adding the mixed solution of the ironsalt and the structure-directing agent; (4) performing heating reflux; (5) performing reduction with a sodium borohydride alkaline solution; (6) performing filtering and washing; (7) performing intermediate-temperature calcination. The prepared iron (II,III) oxide supported expanded graphite anode material has special morphology and structure and excellent electrochemical performance.

Description

technical field [0001] The invention relates to the field of lithium battery negative electrode materials, in particular to an expanded graphite negative electrode material loaded with willow-shaped iron ferric oxide, and a preparation method of the material. Background technique [0002] With the frequent shortage of non-renewable energy sources such as coal, oil, and natural gas, the energy problem is a serious problem faced by mankind in the 21st century, and the development of new energy and renewable clean energy is of paramount importance. Compared with traditional secondary batteries, lithium-ion batteries have outstanding advantages such as high working voltage, large specific energy, stable discharge voltage, long cycle life, and no environmental pollution. They have been widely used in mobile phones, notebook computers, and portable measuring instruments. and other small and lightweight electronic devices. At the same time, it is also the preferred power source fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/587H01M4/52H01M4/62H01M10/052
CPCH01M4/366H01M4/52H01M4/587H01M4/628H01M10/052H01M2004/021H01M2004/027Y02E60/10
Inventor 晏荦汤占磊仰韻霖
Owner DONGGUAN KAIJIN NEW ENERGY TECH
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