Preparation method of titanium dioxide/iron oxide composite negative electrode material

A technology of titanium dioxide and negative electrode materials, applied in battery electrodes, electrical components, circuits, etc., can solve the problems of no lithium-ion battery patent reports, unfavorable large-scale production, cumbersome steps, etc., and achieve low price, short cycle, and process route simple effect

Active Publication Date: 2017-02-01
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Currently available Fe 2 o 3 The preparation method of composite materials and titanium dioxide materials is mainly to synthesize one of the materials (Fe 2 o 3 or titanium dioxide), and then proceed to the next step to load another material (titanium dioxide or Fe 2 o 3 ), and finally get Fe 2 o 3 Composite materials with titanium dioxide, this method has cumbersome steps, relatively long cycle, high energy consumption, and is not conducive to large-scale production. There is no report on the one-step Fe 2 o 3 Materials and Titanium Dioxide Composites
[0006] Currently for Fe 2 o 3 Composite materials with titanium dioxide, there is no patent report for lithium-ion batteries

Method used

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  • Preparation method of titanium dioxide/iron oxide composite negative electrode material
  • Preparation method of titanium dioxide/iron oxide composite negative electrode material
  • Preparation method of titanium dioxide/iron oxide composite negative electrode material

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Embodiment 1, a kind of preparation method of titanium dioxide / iron oxide composite negative electrode material, carries out following steps successively:

[0037] 1), weigh 0.36 grams (1.39×10 -3 mol) titanyl sulfate, dissolved in 2 milliliters of deionized water (0.11mol), then added 0.37 grams (1.37 × 10 -3 mol) ferric chloride, stir to form an orange-yellow solution;

[0038] 2), add 0.25 grams of polyvinylpyrrolidone to the solution obtained in step 1) and stir until it is completely dissolved;

[0039] 3) Under the condition of vigorous stirring, slowly add 0.5 ml of formamide dropwise to the solution obtained in step 2) (that is, drop it in about half a minute), and after stirring for 5 minutes, age the gel at 60°C for 3 hours;

[0040] 4), drying the gel obtained in step 3) at 60°C under normal pressure for 24 hours to obtain a precursor product;

[0041] 5) The temperature of the obtained precursor product was raised to 600° C. for 5 hours in an air atmosphe...

Embodiment 2

[0043] Embodiment 2, a kind of preparation method of titanium dioxide / iron oxide composite negative electrode material, carries out following steps successively:

[0044] 1), weigh 0.36 grams (1.39×10 -3 mol) titanyl sulfate, dissolved in 2 milliliters (0.11mol) of deionized water, and then added 0.5 grams (1.85×10 -3 mol) high ferric chloride, stir to form an orange-yellow solution;

[0045] 2), add 0.25 g of polyvinylpyrrolidone to the solution obtained in step 1) and stir until it is completely dissolved,

[0046] 3) Under the condition of vigorous stirring, slowly add 0.5 ml of formamide dropwise to the solution obtained in step 2) (dropping is completed in about half a minute), and after stirring for 5 minutes, age the gel at 60°C for 3 hours;

[0047] 4), drying the gel obtained in step 3) at 60°C under normal pressure for 24 hours to obtain a precursor product;

[0048] 5) The temperature of the obtained precursor product was raised to 600° C. for 5 hours in an air a...

Embodiment 3

[0050] Embodiment 3, a kind of preparation method of titanium dioxide / iron oxide composite negative electrode material, carry out following steps successively:

[0051] 1), weigh 0.7 grams (2.71×10 -3 mol) titanyl sulfate, dissolved in 4 milliliters (0.22mol) of deionized water, and then added 0.37 grams (1.37×10 -3 mol) high ferric chloride, stir to form an orange-yellow solution;

[0052] 2), add 0.25 grams of polyvinylpyrrolidone to the solution obtained in step 1) and stir until it is completely dissolved;

[0053] 3) Slowly add 0.5 ml of formamide dropwise to the solution obtained in step 2) under vigorous stirring (about half a minute to finish), stir for 5 minutes and then age the gel at 60°C for 3 hours;

[0054] 4), drying the gel obtained in step 3) at 60°C under normal pressure for 24 hours to obtain a precursor product;

[0055] 5) The temperature of the obtained precursor product was raised to 600° C. for 5 hours in an air atmosphere, and then cooled to room te...

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Abstract

The invention discloses a preparation method of a titanium dioxide / iron oxide composite anode material. The preparation method sequentially comprises the following steps of (1) dissolving titanyl sulfate into deionized water, then, adding iron salt, and stirring until the iron salt is dissolved; (2) adding polyvinylpyrrolidone into the solution obtained in the step (1), and stirring until polyvinylpyrrolidone is completely dissolved; (3) dropwise adding methanamide into the solution obtained in the step (2) while fiercely stirring, and aging gel after stirring for 5-10 minutes; (4) drying the gel obtained in the step (3) under normal pressure at 50-70 DEG C for 22-26 hours to obtain a precursor product; and (5) heating the precursor product at the air atmosphere to 500-800 DEG C, keeping the temperature for 5-7 hours, and cooling to the room temperature to obtain the titanium dioxide / iron oxide composite anode material. The titanium dioxide / iron oxide composite anode material has relatively-high specific capacity and stable circulating performance.

Description

technical field [0001] The invention belongs to the field of new energy materials for lithium ion batteries, and in particular relates to a preparation method of a titanium dioxide / iron oxide composite negative electrode material. Background technique [0002] As a new type of green high-energy chemical power source, lithium-ion batteries are widely used in various small portable devices such as mobile phones, cameras, and computers. At the same time, they also have important application prospects in electric vehicles, aerospace and other fields. In recent years, new industrial technologies represented by electric vehicles have developed rapidly, and at the same time, higher performance requirements have been put forward for lithium-ion batteries. The negative electrode material is the main component of lithium-ion batteries. At present, commercial lithium-ion batteries generally use graphite-based materials as negative electrode materials, and their lithium storage specific...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/1391H01M4/48
CPCH01M4/1391H01M4/362H01M4/48H01M4/52Y02E60/10
Inventor 郭兴忠朱文均王子晨杨辉
Owner ZHEJIANG UNIV
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