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Preparation method of molybdenum-carbon composite cathode material of lithium ion battery

A lithium-ion battery and negative electrode material technology, which is applied in battery electrodes, circuits, electrical components, etc., can solve problems such as poor electronic conductance and ionic conductance, and achieve the effects of high specific capacity, stable cycle performance, and uniform structure dispersion.

Inactive Publication Date: 2013-04-24
SHANGHAI JINZHONG INFORMATION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

MoO 2 As a negative electrode material for lithium-ion batteries, it has great application prospects, but it also has certain disadvantages: its electronic conductance and ion conductance are poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Preparation of High Specific Surface Carbon

[0027] Mix polyacrylonitrile and anhydrous sodium carbonate with a weight ratio of 1:2 evenly, add N,N-dimethylformamide solvent, stir for 3 hours, and distill off the solvent under reduced pressure to obtain a solid mixture. Under the protection of nitrogen, put it into a tube furnace for roasting. The heating program is as follows: first keep at 120°C for 3h, the heating rate is 3°C / min, then raise the temperature to 800°C and keep for 2h, the heating rate is 8°C / min, roasting The obtained sample was first washed with water until the pH value was neutral, then washed three times with ethanol, and dried at 45° C. until constant weight.

[0028] Preparation of Molybdenum Oxide Nanomaterials

[0029] Ammonium molybdate (NH 4 ) 6 Mo 7 o 24 4H 2 O is dissolved in deionized water as a molybdenum source, and stirred evenly to make a clear and transparent ammonium molybdate solution, wherein the amount of molybdenum adde...

Embodiment 2

[0033] Preparation of High Specific Surface Carbon

[0034] Mix polyacrylonitrile and anhydrous sodium carbonate with a weight ratio of 1:4 evenly, add N,N-dimethylformamide solvent, stir for 3 hours, and distill off the solvent under reduced pressure to obtain a solid mixture. Under the protection of nitrogen, put it into a tube furnace for roasting. The heating program is as follows: first keep at 160°C for 2h, the heating rate is 5°C / min, then raise the temperature to 850°C and keep for 1h, the heating rate is 10°C / min, roasting The obtained sample was first washed with water until the pH value was neutral, then washed three times with ethanol, and dried at 50° C. until constant weight.

[0035] Preparation of Molybdenum Oxide Nanomaterials

[0036] Ammonium molybdate (NH 4 ) 6 Mo 7 o 24 4H 2 O is dissolved in deionized water as a molybdenum source, and stirred evenly to make a clear and transparent ammonium molybdate solution, wherein the amount of molybdenum add...

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Abstract

The invention discloses a molybdenum-carbon composite cathode material of a lithium ion battery and a preparation method thereof. The method comprises preparing carbon with a high specific surface, dissolving ammonium molybdate (NH4)6Mo7O24*4H2O as a molybdenum source in deionized water, stirring to prepare an ammonium molybdate solution; adding polyvinyl alcohol into distilled water to obtain a clear and transparent polyvinyl alcohol aqueous solution, adding 5-10 parts of the ammonium molybdate solution into the prepared polyvinyl alcohol aqueous solution, cooling to obtain a molybdenum oxide precursor sol, preparing composite nanowire of the molybdenum oxide and the polyvinyl alcohol by electrospinning; and preparing the molybdenum oxide nano / carbon composite materials. According to the molybdenum-carbon composite material provided by the invention, the composite material is stable in structure and uniform in distribution by uniformly distributing the molybdenum oxide nano-materials in and out of the carbon with the high specific surface, so that the composite material is high in energy density and furthermore stable in cyclic performance, and when used as the cathode material of the lithium ion battery, is high in specific capacity, good in cyclic performance and long in service life.

Description

technical field [0001] The invention relates to a preparation method of a negative electrode material of a lithium ion electrode, in particular to a molybdenum-carbon composite negative electrode material of a lithium ion battery and a preparation method thereof. Background technique [0002] The trend of miniaturization, high energy, and portability of electronic appliances, the development of space technology, the demand for national defense equipment, and the research and development of electric vehicles have higher requirements for the performance of lithium-ion batteries. The improvement of lithium-ion battery performance mainly depends on the improvement of energy density and cycle life of lithium intercalation electrode materials. [0003] The commercially widely used graphite-based carbon anode materials have some disadvantages: the potential of the carbon electrode is very close to that of metal lithium (100 mV vs. Li + / Li), metal lithium is easily precipitated on...

Claims

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Application Information

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IPC IPC(8): H01M4/583H01M4/36
CPCY02E60/12Y02E60/10
Inventor 姜波
Owner SHANGHAI JINZHONG INFORMATION TECH
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