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Process for producing high capacity molybdenum dioxide/carbon cathode materials

A molybdenum dioxide and negative electrode material technology, applied in the field of lithium ion batteries, can solve the problems of applications that cannot meet industrial production, long heat treatment time, etc., and achieve the effects of high rate performance, high specific capacity, and long cycle life

Inactive Publication Date: 2012-08-01
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The heat treatment time in the preparation process is longer, and the prepared MoO 2 The specific capacity is only 318mAh g -1 , less than MoO 2 Half of the theoretical specific capacity, and the reported number of cycles is only 20 times (Journal of Power Sources, 179(2008): 357-360), which cannot meet the application of industrial production

Method used

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  • Process for producing high capacity molybdenum dioxide/carbon cathode materials
  • Process for producing high capacity molybdenum dioxide/carbon cathode materials
  • Process for producing high capacity molybdenum dioxide/carbon cathode materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] First, a cotton fiber fabric with a size of 20 mm×20 mm was soaked in an ethanol solution of phosphomolybdic acid with a concentration of 0.1 mM / ml, and stirred for 2 hours.

[0029] Then, it was dried at 60° C. for 5 minutes, and aged at 90° C. for 3 hours.

[0030] Finally in Ar / H 2 (preferably H 2 Accounting for 5% of the total volume) heat treatment at 500°C for 5 hours in a mixed atmosphere to obtain an ultrafine MoO 2 MoO with nanoparticles (2 / C nanostructured composites.

[0031] figure 1 It is the SEM figure of the product of the present invention, shows that the final product still keeps the initial appearance of cotton fiber fabric. figure 2 is a TEM image of the product of the present invention, illustrating that MoO 2 Nanoparticles ( image 3 It is the EDX figure of the product of the present invention, illustrates that the main component of the product of the present invention is MoO 2 and carbon.

[0032] The product obtained above is used as an el...

Embodiment 2

[0034] A cotton fiber fabric with a size of 20 mm×20 mm was soaked in an ethanol solution of phosphomolybdic acid with a concentration of 0.05 mM / ml, and stirred for 2 hours. Then, dry at 50°C for 30 minutes, then aging at 100°C for 6 hours, under Ar / H 2 (5%) heat treatment at 600°C for 5 hours in a mixed atmosphere to obtain MoO 2 / C composites, whose morphology is characterized by ultrafine MoO 2 The nanoparticles are uniformly distributed in the carbon matrix.

[0035] The above obtained MoO 2 The / C composite material was assembled into a button battery in the same manner as in Example 1, and the electrochemical performance was tested.

Embodiment 3

[0037] A cotton fiber fabric with a size of 20 mm×20 mm was soaked in an ethanol solution of phosphomolybdic acid with a concentration of 0.15 mM / ml, and stirred for 2 hours. Then, it was dried at 70° C. for 5 minutes, and then aged at 80° C. for 6 hours. in Ar / H 2 (5%) heat treatment at 550°C for 6 hours in a mixed atmosphere to obtain MoO 2 / C Composite.

[0038] The above obtained MoO 2 The / C composite material was assembled into a button battery in the same manner as in Example 1, and the electrochemical performance was tested.

[0039] In above-mentioned each embodiment, the size of cotton fiber fabric, the ethanol solution of phosphomolybdic acid are only exemplary, are not limited to on the above-mentioned consumption, generally speaking, the size of cotton fiber fabric can be selected according to specific circumstances, phosphorus molybdenum The ethanol solution of the acid is acceptable as long as it satisfies a certain range, such as 0.05-0.2mM / ml. At the same...

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Abstract

The invention discloses a process for producing high capacity molybdenum dioxide / carbon cathode materials. The process includes the steps of 1) immersing cotton fiber fabric of a certain size in an ethanol solution of phosphomolybdic acid and stirring; 2) drying and ageing the immersed cotton fiber fabric; and 3) subjecting the dried and aged cotton fiber fabric to heat treatment in mixed gases, and obtaining the molybdenum dioxide / the carbon (MoO2 / C) composite materials. The invention further discloses cathode materials which are produced by the process, an electrode slice which is made of the cathode materials and a button cell which comprises the electrode slice. According to the molybdenum dioxide / the carbon composite materials produced by the process, the specific capacity is high, the multiplying power property and the cycling stability are good, and the coulomb efficiency is high. The process is simple and suitable for large-scale production.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a preparation method of a negative electrode material with high capacity and long cycle life. Background technique [0002] Lithium-ion batteries have been widely used in mobile and portable appliances due to their advantages such as high energy density, high average open circuit voltage and long cycle life. Flexible packaging lithium-ion batteries are widely used in the field of consumer electronics due to their advantages such as flexible size design and good safety performance. However, the development of miniaturization and thinning of electronic products has higher and higher energy density requirements for lithium-ion batteries, and higher and higher capacity requirements for lithium-ion battery electrode materials, especially negative electrode active materials. [0003] At present, graphite materials are mostly used as anode materials for commercialized lithium-ion b...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/13H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 胡先罗孙永明黄云辉罗巍李真袁利霞张五星
Owner HUAZHONG UNIV OF SCI & TECH
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