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class porous znfe 2 o 4 /c Lithium-ion battery negative electrode material and preparation method thereof

A lithium-ion battery, hierarchical porous technology, applied in the field of electrochemistry, can solve the problems of low carbon conversion efficiency and uneven carbon layer, and achieve the effect of high carbon conversion rate, accelerated electrochemical reaction rate, and small size

Active Publication Date: 2021-06-04
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Existing ZnFe 2 o 4 / C preparation method usually uses glucose as carbon source, the conversion efficiency of carbon is low, and the carbon layer formed is not uniform

Method used

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  • class porous znfe <sub>2</sub> o <sub>4</sub> /c Lithium-ion battery negative electrode material and preparation method thereof
  • class porous znfe <sub>2</sub> o <sub>4</sub> /c Lithium-ion battery negative electrode material and preparation method thereof
  • class porous znfe <sub>2</sub> o <sub>4</sub> /c Lithium-ion battery negative electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1

[0066] Example 1-1, Hierarchical Porous ZnFe 2 O 4 / C Lithium Ion Battery Anode Material Preparation Method, including the following steps:

[0067] A), 1.2 ml of deionized water (0.067 mol) was suggested to 2.4 ml of glycerol, and the magnetic force was stirred to mix well, and the solution I was obtained.

[0068] B), 2.5 g of polyacrylic acid is added to the solution I obtained from step a), and the polyacrylic acid has a molecular weight of 10000, thoroughly stirred to polyacrylic acid completely dispersion dissolution, and obtains solution II (uniform solution);

[0069] Note: 1.2ml of deionized water is 1.2g;

[0070] C) Add ZnCl as a precursor to the solution II obtained from step b). 2 (Ie, zinc source) 0.408 g (0.0029 mol) and FECL 2 · 4h 2 O (iron source) 1.192g (0.0058mol), stir until ZnCl 2 FECL 2 · 4h 2 O is completely hydrolyzed to obtain a clear and transparent solution III;

[0071] At this time, deionized water and ZnCl 2 The molar ratio is 23.1: 1 (0.067: 0.0029...

Embodiment 1

[0088] Example 1-2, the temperature of step e, step f, and step j in the oven is changed from 40 ° C to 50 ° C, and the temperature of the drop plus process in step d is changed from no more than 40 ° C In order not to exceed 50 ° C, the rest is equivalent to Example 1.

[0089] Znfe 2 O 4 For hollow skeleton structure, its large pore size is 420 nm, Znfe 2 O 4 / C Macroporous size is 350 nm; ZnFe2O4 mesh is 35 nm, and the ZnFe2O4 / C mesh is 32 nm;

[0090] Znfe 2 O 4 The / C carbon layer has a uniform 4 nm, and the load capacity of carbon is 9.2%, and the conversion of carbon is 55.2%. At the current density of 200mAg -1 The performance of the charge and discharge cycle, the discharge ratio capacitance 860mAh g after 100 turns of the current density charge cycle -1 . In the current density of 1AG -1 The performance of the charge and discharge cycle, the discharge ratio capacitor can retain 670mAh g after the electricity density is 400 laps -1 .

[0091] Znfe 2 O 4 / C, znfe 2 O ...

Embodiment 2

[0102] Example 2, ZnFe is prepared in Example 1-1 2 O 4 Method Change to the following steps:

[0103] A), 1 mL (0.056 mol) of deionized water was added to 2 mL of glycerol, and the magnetic force was stirred to mix well, and the solution I was obtained.

[0104] B), 2.5 g of polyacrylic acid is added to the solution I obtained from step a), and the polyacrylic acid has a molecular weight of 100,000, stirred until the polyacrylic acid is completely dispersed, and the solution II (uniform solution) is obtained;

[0105] C), add Zn as a precursor to the solution II obtained from step b) (NO 3 ) 2 · 6h 2 O 0.826g (0.00278mol) and Fe (NO 3 ) 2 · 6h 2 O 1.60g (0.00556mol), stir until Zn (no 3 ) 2 · 6h 2 O and Fe (NO 3 ) 2 · 6h 2 O is completely hydrolyzed to obtain a clear and transparent solution III;

[0106] At this time, deionized water and ZnCl 2 The molar ratio is 20.1: 1 (0.056: 0.00278);

[0107] Zn (NO) 3 ) 2 · 6h 2 O and Fe (no 3 ) 2· 6h 2 O The molar ratio is 1: 2;

[0108] ...

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Abstract

The invention provides a hierarchical porous ZnFe 2 o 4 The preparation method of / C lithium-ion battery negative pole material, at first ZnFe 2 o 4 Add to Tris-HCl buffer solution and sonicate for 10±1min, then stir for 20-40min to obtain a dispersion; then add dopamine to the obtained dispersion, and magnetically stir for 24±2h to obtain a suspension; centrifuge the obtained suspension to obtain a black The precipitate was dried in an oven at 40-60°C for 48±2h to obtain a black sample; finally, the obtained black sample was placed in a tube furnace and heated to 100-200°C at a heating rate of 2-7°C / min under the protection of argon , keep it warm for 60-120min, then heat it to 400-700℃ at a heating rate of 2-7℃ / min, keep it for 100-300min, and finally get a carbon-coated hierarchical porous ZnFe 2 o 4 / C active electrode material.

Description

Technical field [0001] The present invention relates to the field of electrochemical, and more particularly to a semiconded porous ZnFe 2 O 4 / C lithium ion battery negative electrode material and preparation method thereof. Background technique [0002] In recent years, with the gradual deterioration of the ecological environment and the increasingness of traditional fossil energy, new types of green energy becomes the primary goal of all countries in the world. The chemical power supply has received more attention from domestic and foreign energy. Due to the growing demand for energy conversion and storage, the lithium-ion battery has been greatly concerned from the portable electronic device to electric vehicles, and the lithium ion battery has received great attention due to the superior energy density above other rechargeable batteries. From the portable electronic equipment to electric vehicles, lithium The ion battery has been greatly concerned due to the energy density a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/52H01M4/62H01M10/0525
CPCH01M4/362H01M4/483H01M4/523H01M4/62H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 郭兴忠冯道言杨辉
Owner ZHEJIANG UNIV
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