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A lithium battery electrode material α-fe 2 o 3 The preparation method of nanosphere

An electrode material, nanosphere technology, applied in battery electrodes, nanotechnology for materials and surface science, negative electrodes, etc., can solve the problems of capacity fading, poor capacity, etc. The effect of the chemical window

Inactive Publication Date: 2020-03-10
HENAN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The currently studied iron oxide-based anode materials mainly include Fe 3 o 4 , FeO, Fe 2 o 3 These materials have excellent specific capacity performance, but the capacity is poor due to the rapid decay of the capacity accompanied by the volume change of the material during the charge and discharge test.

Method used

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  • A lithium battery electrode material α-fe <sub>2</sub> o <sub>3</sub> The preparation method of nanosphere
  • A lithium battery electrode material α-fe <sub>2</sub> o <sub>3</sub> The preparation method of nanosphere
  • A lithium battery electrode material α-fe <sub>2</sub> o <sub>3</sub> The preparation method of nanosphere

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Embodiment 1

[0023] The lithium ion battery electrode material α-Fe of the present embodiment 2 o 3 The preparation method of nanosphere, concrete steps are as follows:

[0024] (1) Dissolve potassium chlorate and ferrous sulfate in deionized water to obtain a mixed solution, wherein the concentration of potassium chlorate is 1mol / L, and the concentration of ferrous sulfate is 0.5mol / L;

[0025] (2) Adjust the pH value of the solution to 10 by using coconut acid diethanolamide with a concentration of 0.25 mol / L, place the mixed solution in a high-pressure reactor, heat it at 140°C for 12 hours, and then take out the reactor;

[0026] (3) Repeated ultrasonic washing with deionized water for 30 min, and separated the precipitated product;

[0027] (4) The precipitated product is dried and calcined at 350°C for 5 hours under an oxygen atmosphere to obtain the final dark brown powder product α-Fe, an electrode material for lithium-ion batteries 2 o 3 nanospheres.

[0028] figure 1 is the...

Embodiment 2

[0032] The lithium ion battery electrode material α-Fe of the present embodiment 2 o 3 The preparation method of nanosphere, concrete steps are as follows:

[0033] (1) Dissolve potassium chlorate and ferrous sulfate in deionized water to obtain a mixed solution, wherein the concentration of potassium chlorate is 0.8mol / L, and the concentration of ferrous sulfate is 0.4mol / L;

[0034] (2) Adjust the pH value of the solution to 10 by using coconut acid diethanolamide with a concentration of 0.2mol / L, put the mixed solution in a high-pressure reactor, heat it at 120°C for 14 hours, and then take out the reactor;

[0035] (3) Repeated ultrasonic washing with deionized water for 50 min, and separated the precipitated product;

[0036] (4) The precipitated product is dried and calcined at 300°C for 6 hours under an oxygen atmosphere to obtain the final dark brown powder product α-Fe, an electrode material for lithium-ion batteries 2 o 3 nanospheres.

Embodiment 3

[0038] The lithium ion battery electrode material α-Fe of the present embodiment 2 o 3 The preparation method of nanosphere, concrete steps are as follows:

[0039] (1) Dissolve potassium chlorate and ferrous sulfate in deionized water to obtain a mixed solution, wherein the concentration of potassium chlorate is 1.2mol / L, and the concentration of ferrous sulfate is 0.6mol / L;

[0040] (2) Adjust the pH value of the solution to 10 by using coconut acid diethanolamide with a concentration of 0.3mol / L, place the mixed solution in a high-pressure reactor, heat it at 150°C for 10 hours, and then take out the reactor;

[0041] (3) Repeated ultrasonic washing with deionized water for 20 min, and separated the precipitated product;

[0042] (4) The precipitated product is dried and calcined at 400°C for 4 hours under an oxygen atmosphere to obtain the final dark brown powder product α-Fe, an electrode material for lithium-ion batteries2 o 3 nanospheres.

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Abstract

The invention discloses a preparation method of a lithium battery electrode material alpha-Fe2O3 nanosphere. The specific steps include: dissolving potassium chlorate and ferrous sulfate in deionizedwater to obtain a mixed solution, using a coconut diethanolamide solution to adjust the pH value of the solution to 10, putting the mixed solution in a high-pressure reaction kettle, performing heating at 120DEG C-150DEG C for 10h-14h, and then taking the product out of the reaction kettle; conducting repeated ultrasonic washing with deionized water for 20min-50min, and separating the precipitateproduct; drying the precipitate product, and performing calcinations at 350DEG C in oxygen atmosphere for 51h, thus obtaining the final black brown powder product. The Fe2O3 prepared by the method provided by the invention has cheap and easily available raw materials, also can have a wider electrochemical window and better rate performance under the same conditions, and has good cycle performance.

Description

technical field [0001] The invention belongs to the technical field of preparation of new energy materials, in particular to a lithium battery electrode material α-Fe 2 o 3 Preparation methods of nanospheres. Background technique [0002] Because of its high energy density, long cycle life, low self-discharge rate, high working voltage, wide operating temperature range, no memory effect, and high open circuit voltage, lithium-ion batteries are widely welcomed by consumers and have been widely used. Used in mobile devices such as laptops, mobile phones, cameras, etc., and has gradually replaced traditional energy sources. In the field of smart phones, people have put forward higher requirements for the battery life stability of mobile phones, which has led to an increasingly urgent demand for batteries with cycle performance. Compared with today's commercialized graphite anode materials, the Fe we prepared 2 o 3 It has a wider electrochemical window, more excellent rate ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G49/06H01M4/52H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01G49/06C01P2002/72C01P2004/03C01P2004/32C01P2004/64H01M4/52H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 陈泽华张波邢宝林陈兴颖张火利曹建亮孙广孟哈日巴拉张传祥张战营
Owner HENAN POLYTECHNIC UNIV
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