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Preparation method and purpose for iron oxide-based anode material for lithium ion battery

A technology for ion batteries and negative electrode materials, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of cycle performance degradation, limited practical application, low conductivity, etc., and achieve improved cycle stability, good electrochemical performance, cycle The effect of excellent stability

Inactive Publication Date: 2012-11-28
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

However, Fe 2 o 3 and Fe 3 o 4 The conductivity of the material itself is low, and volume expansion will occur during the cycle. After the first reaction, it will transform into particles with a size of several nanometers, which may cause electrode cracks. At the same time, due to the fundamental change in the structure before and after lithium storage, the solid electrolyte interface ( SEI) film cannot exist stably, which eventually leads to capacity attenuation and cycle performance degradation, which limits the practical application of this material.
The preparation method and morphology of the material have a great influence on the performance of the material. At present, iron oxides used as anode materials for lithium-ion batteries are mainly prepared by hydrothermal method and co-precipitation method. The reaction process is uncontrollable, the repeatability is poor and The yield is very low, which cannot be mass-produced and also limits the practical application of this material

Method used

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  • Preparation method and purpose for iron oxide-based anode material for lithium ion battery
  • Preparation method and purpose for iron oxide-based anode material for lithium ion battery
  • Preparation method and purpose for iron oxide-based anode material for lithium ion battery

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preparation example Construction

[0020] The preparation method of iron oxide-based lithium ion battery negative electrode material comprises the following steps:

[0021] 1) Dissolve the iron salt precursor in water, mix well and then add combustion agent, the molar ratio of combustion agent to iron ion is 0.5:1-4:1, mix well and then add ammonia water to adjust the pH of the solution to 6.5-7.5 ;

[0022] 2) Heat and evaporate the solution in a water bath, keep the temperature constant at 70-100°C, and stir continuously for 1-4 hours until a viscous gel is formed;

[0023] 3) Put the gel in a muffle furnace pre-heated to 200-500°C for combustion reaction, and keep it warm for 1 hour after the combustion reaction to obtain Fe 2 o 3 Powder;

[0024] 4) Fe 2 o 3 The powder and the organic carbon source are ground and mixed at a mass ratio of 1:0.01 to 1:1, then placed in a tube furnace, and then heat treated at 400 to 800°C for 1 to 10 hours in an argon atmosphere to obtain Fe. 3 o 4 / C composites, where...

Embodiment 1

[0028] 1) Dissolve ferric nitrate in water, mix well and then add citric acid, the molar ratio of citric acid to iron ion is 2:1, mix well and then add ammonia water to adjust the pH of the solution to 7;

[0029] 2) Heat and evaporate the solution in a water bath, keep the temperature constant at 80°C, and stir continuously for 1 to 4 hours until a viscous gel is formed;

[0030] 3) Put the gel in a muffle furnace preheated to 500°C for combustion reaction, and keep it warm for 1 hour after the combustion reaction to obtain fluffy Fe 2 o 3 Powder;

[0031] From figure 1 The Fe prepared in Example 1 2 o 3 The X-ray diffraction pattern of the powder shows that the position of the diffraction peak of the sample is the same as that of Fe in the standard spectrum. 2 o 3 (JCPDS No33-0664) The diffraction peak positions are consistent, proving that the prepared Fe is pure 2 o 3 Mutually.

[0032] figure 2 is the Fe prepared in Example 1 2 o 3 The scanning electron micr...

Embodiment 2

[0037] 1) Dissolve ferric nitrate in water, mix well and then add citric acid, the molar ratio of citric acid to iron ion is 2:1, mix well and then add ammonia water to adjust the pH of the solution to 7;

[0038] 2) Heat and evaporate the solution in a water bath, keep the temperature constant at 80°C, and stir continuously for 1 to 4 hours until a viscous gel is formed;

[0039] 3) Put the gel in a muffle furnace preheated to 500°C for combustion reaction, and keep it warm for 1 hour after the combustion reaction to obtain fluffy Fe 2 o 3 Powder;

[0040] 4) Fe 2 o 3 The powder and sucrose are ground and mixed at a mass ratio of 1:0.6, then placed in a tube furnace, and heat-treated at 500°C for 2 hours in an argon atmosphere to incompletely burn the sucrose and reduce Fe 2 o 3 , get Fe 3 o 4 / C composites, where carbon accounts for Fe 3 o 4 The mass fraction of / C is 13.34%.

[0041] From Figure 4 The Fe prepared in Example 2 3 o 4 The X-ray diffraction patter...

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Abstract

The invention discloses a preparation method and purposes for an iron oxide-based anode material for lithium ion batteries. The method comprises the following steps: 1) dissolving a ferric salt precursor in water, adding combustion agents after mixing uniformly, and after mixing uniformly, adding ammoniacal liquor to adjust the pH value; 2) placing the solution obtained in water bath for heating and evaporating, until the formation of viscous gel; 3) placing the gel in a muffle furnace for combustion reaction to obtain Fe2O3 powder; 4) obtaining a Fe3O4 / C composite material after heat treatment at the temperature of 400-800 DEG C in the argon atmosphere of the Fe3O4 powder and an organic carbon source, wherein the carbon accounts for 0.5-40% by mass of the Fe3O4 / C composite material. The Fe2O3 powder and the Fe3O4 / C composite material prepared by using the method are used for preparing anode materials for lithium ion batteries. The method is simple and controllable and can be used in mass production; the Fe3O4 powder prepared by the method has a large specific surface area, and high purity; and by using the Fe3O4 / C composite material prepared through reduction carbon coating as the anode material for lithium ion batteries, the batteries has high specific capacity, and good cycle stability and multiplying power performance.

Description

technical field [0001] The invention relates to a preparation method and application of an iron oxide-based lithium ion battery negative electrode material, belonging to the technical field of lithium ion batteries. Background technique [0002] Because of its light weight, high voltage, high capacity, high power, stable discharge, and environmental friendliness, lithium-ion batteries are considered to be the most potential system in mobile energy storage systems and have broad application prospects. As lithium-ion batteries The main body of lithium storage, the anode material is an important part of the lithium-ion battery, and whether the anode material can be prepared with high efficiency and reversible lithium ion intercalation and desorption is one of the keys to the successful application of the lithium-ion battery. The commercial lithium-ion battery anode material is graphitized carbon material, which can provide stable and high working voltage, rich in sources, and l...

Claims

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Application Information

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IPC IPC(8): H01M4/52H01M4/583
CPCY02E60/12Y02E60/10
Inventor 姜银珠胡梅娟严密
Owner ZHEJIANG UNIV
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