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A kind of amorphous manganese oxide coated iron oxide lithium/sodium ion battery negative electrode material and preparation method thereof

A sodium ion battery, manganese oxide technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as the harm of lithium / sodium ion batteries, achieve good electrochemical performance, improve kinetic performance, and low cost. Effect

Active Publication Date: 2018-06-19
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the MnO in this material 2 It has a crystal form, so there is a certain amount of crystal water, and the existence of water molecules has a certain harmful effect on lithium / sodium ion batteries

Method used

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  • A kind of amorphous manganese oxide coated iron oxide lithium/sodium ion battery negative electrode material and preparation method thereof
  • A kind of amorphous manganese oxide coated iron oxide lithium/sodium ion battery negative electrode material and preparation method thereof
  • A kind of amorphous manganese oxide coated iron oxide lithium/sodium ion battery negative electrode material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Solution A: Weigh 80mg Fe 2 o 3 , dispersed it in 25mL deionized water, and obtained a uniform dispersion after ultrasonication for 30 minutes. Solution B: 0.20g KMnO 4 Dissolve in 25mL deionized water, then add 0.8mL 1M HCl, stir well. After solution B was heated to 95°C, solution A was added dropwise thereto. Under magnetic stirring, the mixture was heated at 95 °C for 2 h. After natural cooling, the product was washed several times by centrifugation with deionized water and ethanol, and then dried at 80°C to obtain brown amorphous MnO 2 Coated Fe 2 o 3 composite material.

[0027] In the above preparation method, heating the mixed solution at 95°C for 2h to extend to 5h, 8h, 14h or 23h can also obtain brown amorphous MnO 2 Coated Fe 2 o 3 composite material.

[0028] In N-methyl-pyrrolidone (NMP) as solvent, the amorphous MnO 2 Coated Fe 2 o 3 The composite material is mixed evenly with acetylene black and polyvinylidene fluoride (PVDF) according to the...

Embodiment 2

[0034] Solution A: Weigh 400mg Fe 2 o 3 , dispersed it in 25mL deionized water, and obtained a uniform dispersion after ultrasonication for 30 minutes. Solution B: 1.20g KMnO 4 Dissolve in 25mL deionized water, then add 10.0mL 1M HCl, stir well. After solution B was heated to 140°C, solution A was added dropwise thereto. Under magnetic stirring, the mixture was heated at 140 °C for 8 h. After natural cooling, the product was washed several times by centrifugation with deionized water and ethanol, and then dried at 80°C to obtain brown amorphous MnO 2 Coated Fe 2 o 3 composite material. in H 2 (30%H 2 and 70% Ar) atmosphere, the prepared MnO 2 Coated Fe 3 o 4 The composite was fired at 350°C for 5h. After cooling to room temperature, the product was centrifuged and then dried to obtain amorphous MnO 2 Coated Fe 3 o 4 composite material.

[0035] In N-methyl-pyrrolidone (NMP) as solvent, the amorphous MnO 2 Coated Fe 3 o 4 The composite material is mixed even...

Embodiment 3

[0037] in H 2 (30%H 2 and 70% Ar) atmosphere, the Fe 2 o 3 Burn at 350°C for 5h. After being cooled to room temperature, the product was subjected to centrifugal washing and drying to obtain Fe 3 o 4 . Solution A: Weigh 40mg Fe 3 o 4 , dispersed it in 25mL deionized water, and obtained a uniform dispersion after ultrasonication for 30 minutes. Solution B: 0.40g KMnO 4 Dissolve in 25mL deionized water, then add 0.5mL 2M HCl, stir well. After solution B was heated to 95°C, solution A was added dropwise thereto. Under magnetic stirring, the mixture was heated at 95 °C for 8 h. After natural cooling, the product was washed several times by centrifugation with deionized water and ethanol, and then dried at 80°C to obtain brown amorphous MnO 2 Coated Fe 3 o 4 composite material.

[0038] In N-methyl-pyrrolidone (NMP) as solvent, MnO 2 Coated Fe 3 o 4 The composite material is mixed evenly with acetylene black and polyvinylidene fluoride (PVDF) according to the mass...

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Abstract

The invention discloses a preparation method of an amorphous-form manganese oxide coated iron oxide lithium / sodium ion battery anode material. The preparation method comprises the following steps of heating a mixture liquid of potassium permanganate and acid to 20-200 DEG C, dropwise adding an iron oxide solution which is uniformly dispersed in deionized water, carrying out heat preservation for 1-48 hours at 20-200 DEG C, and washing and centrifuging the product to a shell-core structured amorphous-form manganese oxide coated iron oxide composite material. The shell-core structured amorphous-form manganese oxide coated iron oxide lithium / sodium ion battery anode material prepared according to the preparation method has the advantages of high conductivity, stability in structure, high specific capacity and excellent cycle performance; and moreover, the amorphous-form manganese oxide coated iron oxide lithium / sodium ion battery anode material is rich in raw material and economic in cost, the preparation method is simple and controllable, and mass production can be achieved.

Description

technical field [0001] The invention belongs to the field of energy materials, and in particular relates to a novel lithium-ion or sodium-ion battery electrode material and a preparation method thereof. Background technique [0002] With the rapid development of the global economy, energy and environmental issues have become increasingly prominent. The development of new green energy materials has become an extremely urgent task, especially in lithium-ion / sodium-ion battery electrode materials. The traditional negative electrode material is carbon material such as graphite, due to its small specific capacity (372mAh g -1 ), has been difficult to meet the current demand. In recent years, due to their high theoretical specific capacity (~500-1000mAh g -1 ), high energy density, abundant raw materials, low cost, and environmental friendliness have attracted more and more attention, especially iron oxides. Iron oxides currently used as negative electrode materials are mainly...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/50H01M4/52H01M4/1391H01M10/0525H01M10/054
CPCH01M4/1391H01M4/50H01M4/52H01M10/0525H01M10/054Y02E60/10
Inventor 肖巍汪的华周静徐寅
Owner WUHAN UNIV
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