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A high-capacity iron-based lithium-ion battery cathode material α-lifeo 2 preparation method

A technology for lithium ion batteries and positive electrode materials, which is applied in the field of preparation of α-LiFeO2, a positive electrode material for high-capacity iron-based lithium ion batteries, can solve the problems of complicated synthesis methods, poor electrochemical performance, and impure products, and achieve electrochemical performance. Good, single phase, low price effect

Active Publication Date: 2020-03-27
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to aim at existing α-LiFeO 2 Due to the shortcomings of complex synthesis methods, poor electrochemical performance, complex structure, and impure products, a high-capacity iron-based lithium-ion battery cathode material α-LiFeO is provided. 2 The preparation method; This method adopts the synthetic method at room temperature, by strictly controlling Li + / Fe 3+ Preparation of α-LiFeO by Molar Ratio 2 , whose main feature is to dissolve the reactants in absolute ethanol and directly synthesize α-LiFeO by magnetic stirring at room temperature 2 , Lithium-rich α-LiFeO can be obtained by introducing metallic lithium as a reducing protective agent during the reaction 2 The product, the obtained product is dried after centrifugal separation and washing, and then ground and refined, and then dried to obtain a lithium-ion battery α-LiFeO with excellent electrochemical performance. 2 positive electrode material; and, the manufacturing cost is low, the synthesis method is simple, suitable for large-scale industrial production

Method used

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  • A high-capacity iron-based lithium-ion battery cathode material α-lifeo <sub>2</sub> preparation method
  • A high-capacity iron-based lithium-ion battery cathode material α-lifeo <sub>2</sub> preparation method
  • A high-capacity iron-based lithium-ion battery cathode material α-lifeo <sub>2</sub> preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Dissolve 0.035mol (1.473g) of lithium hydroxide monohydrate and 0.004mol (1.616g) of ferric nitrate nonahydrate in an appropriate amount of absolute ethanol, and add the ferric nitrate solution dropwise to lithium hydroxide at room temperature and under magnetic stirring. Add 0.004mol (about 0.028g) lithium metal to the solution, and stir magnetically at room temperature for 5 hours to obtain a dark brown-brown precipitate; after centrifugation, wash repeatedly with absolute ethanol and deionized water for 5 times, and finally Wash with absolute ethanol to remove excess Li + and other impurity ions, and then put the final sample washed with absolute ethanol in a blast drying oven at 80°C for 4 hours, then manually grind the dried sample for 20 minutes, and then put the refined powder into an 80°C drying oven again Continue to dry for 20h in the middle to obtain lithium-rich layered α-LiFeO 2 Lithium-ion battery cathode material.

[0032] For the above α-LiFeO 2 Lithi...

Embodiment 2

[0034] Dissolve 0.109mol (7.211g) of anhydrous lithium acetate and 0.012mol (5.05g) of ferric nitrate nonahydrate in an appropriate amount of absolute ethanol, and add the ferric nitrate solution dropwise to anhydrous lithium acetate at room temperature and under magnetic stirring. In the solution, add 0.012mol (approximately 0.084g) lithium metal, stir magnetically at room temperature for 5h to obtain a dark brown-brown precipitate, after centrifugation, wash repeatedly 5-8 times with absolute ethanol and deionized water alternately, to remove excess Li + and other impurity ions, and then put the final sample washed with absolute ethanol in a blast drying oven at 80°C for 4 hours, then manually grind the dried sample for 20 minutes, and then put the refined powder into an 80°C drying oven again Continue to dry for 20h in the middle to obtain lithium-rich layered α-LiFeO 2 Lithium-ion battery cathode material. Use it as a positive electrode active material, mix it with acety...

Embodiment 3

[0036] Dissolve 0.048mol (2.016g) of lithium hydroxide monohydrate and 0.004mol (1.616g) of ferric nitrate nonahydrate in an appropriate amount of absolute ethanol, and add the ferric nitrate solution dropwise to hydrogen monohydrate at room temperature and under magnetic stirring. Add 0.004mol (about 0.028g) lithium metal to the lithium oxide solution, and continue magnetic stirring at room temperature for 5 hours to obtain a dark brown precipitate. After centrifugation, wash repeatedly with absolute ethanol and deionized water alternately. to remove excess Li + and other impurity ions, and then the final sample washed with absolute ethanol was dried in a blast drying oven at 80°C for 6 hours, and then the dried sample was manually ground for 20 minutes, and the obtained fine powder was dried again at 80°C Continue to dry in the box for 16h to obtain lithium-rich layered α-LiFeO 2 Lithium-ion battery cathode material. Use it as positive electrode active material, mix with a...

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Abstract

The invention belongs to the field of lithium ion batteries and provides a high-capacity iron-based lithium ion battery positive electrode material α-LiFeO 2 The preparation method is used to overcome the existing α-LiFeO 2 Cathode materials have the disadvantages of complicated synthesis methods, poor electrochemical performance, complex structure, and impure products. This method adopts the method of synthesis at room temperature, through strict control of Li + / Fe 3+ Molar ratio preparation of α‑LiFeO 2 , each reactant was dissolved in absolute ethanol, and α-LiFeO was directly synthesized by magnetic stirring at room temperature 2 , Li-rich α-LiFeO is obtained by introducing metallic lithium as a reducing protective agent during the reaction 2 product, the obtained product is dried after centrifugal separation and washing, and then ground and refined, and then dried to obtain α-LiFeO of lithium ion battery 2 Positive electrode material; the material has no impurities, high purity, single phase, uniform particle size distribution, and the first discharge specific capacity reaches 450mAh / g, 260mAh / g and 202mAh / g at 0.1C, 0.2C and 0.5C respectively. And the manufacturing cost is low, the synthesis method is simple, and it is suitable for large-scale industrial production.

Description

technical field [0001] The invention belongs to the field of lithium-ion batteries, and relates to a high-capacity iron-based lithium-ion battery cathode material α-LiFeO 2 method of preparation. Background technique [0002] The non-renewability and high pollution of traditional energy force people to constantly seek new alternative energy sources with high specific energy and low pollution. The second United Nations Environment Conference focused on green and sustainable development, focusing on the development and utilization of green new energy. As a big energy consumer, China has been making great efforts to develop green new energy. Lithium-ion secondary batteries have been widely studied and applied because of their advantages such as high energy density, long cycle life, no memory effect, reusability, environmental friendliness, and no pollution. It is also the main energy supply system for power stations and portable mobile electronic products, and it is also a ne...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G49/02H01M4/525H01M10/0525
CPCC01G49/02C01P2002/72C01P2004/03C01P2006/40H01M4/525H01M10/0525Y02E60/10
Inventor 刘兴泉胡友作刘珊珊谭铭舒小会张美玲何泽珍
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA