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Lithium ion battery cathode material and preparation method thereof

A technology for lithium ion batteries and negative electrode materials, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as difficulty in large-scale production, complex preparation processes, and complex product components, and achieve a wide range of metal types and materials. The effect of low preparation cost and simple process

Active Publication Date: 2010-06-09
北京华科讯能石墨烯新技术研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

General [LQ. Xu et al. Formation, characterization, and magnetic properties of Fe 3 o 4 nanowiresencapsulated in carbon microtubes.J.Phys.Chem.B 2004, 108.] The pressure and temperature used in the experiment are very high (≥16Mpa, ≥600°C), and the purity of the product is poor (while the nanoparticle is formed, it is also accompanied by Fuller Oxides@C core-shell nanostructures: one-pot synthesis, rational conversion, and Li storage property. Chem. Mater. 2006, 18.] Polysaccharides or polysaccharides are used as carbon sources to react with highly dispersed nano-scale metal oxide particle catalysts at high temperatures (180-1000°C) to prepare nano-metal oxide / carbon materials. This method is often mixed with gas phase growth Carbon fibers or carbon nanotubes, the product components are complex, difficult to separate, the yield is very small, the reaction time is long, and it is difficult to achieve large-scale production; Liu Hao et al.[Hao Liu et al.Magnetite / carbon core-shell nanorods as anode materials forlithium -ion ​​batteries.Electrochemistry Commun.2008, 10.] with α-Fe 2 o 3 Nanorods as templates for the preparation of carbon-coated Fe by hydrothermal method 3 o 4
Apparently, this method requires pre-preparation of nano-α-Fe 2 o 3 template, many steps are required for preparation, the preparation process is complicated, and it is not suitable for industrial scale preparation

Method used

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  • Lithium ion battery cathode material and preparation method thereof
  • Lithium ion battery cathode material and preparation method thereof
  • Lithium ion battery cathode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Weigh 10g of analytically pure resorcinol and 20g of ferrocene according to a mass ratio of 1:2, mix with 200ml of acetone solvent and stir until uniform, then dry in a constant temperature water bath at 40°C until the acetone is completely volatilized to obtain a solid, and place the solid in In a high pressure reactor. Heating is carried out under the protection of nitrogen, and the heating rate is maintained at 3°C / min. When the temperature rises from normal temperature to 450°C, the heating is stopped. When the temperature drops to normal temperature, pyrolysis products are obtained.

[0037] Using pyridine as a solvent, at a temperature of 120°C, the pyrolysis product was repeatedly washed and extracted until the filtrate became colorless and clear. The filter residue after drying is carbon-coated nano-Fe 3 o 4 Composite material with a yield of 68%. Through thermogravimetric analysis, it is obtained that this material contains Fe 3 o 4 was 39.8%.

[0038] Su...

Embodiment 2

[0042] The operation method is the same as in Example 1. Weigh 10 g of analytically pure benzaldehyde and 20 g of iron acetylacetonate according to a mass ratio of 1:2, add them to 200 ml of ethanol solvent, mix and stir until uniform, and then dry in a constant temperature water bath at 40 ° C until the ethanol is completely volatilized A solid was obtained, and the solid was placed in an autoclave. Heating is carried out under the protection of nitrogen, and the heating rate is maintained at 3°C / min. When the temperature rises from normal temperature to 450°C, the heating is stopped immediately. When the temperature drops to room temperature, pyrolysis products are obtained, and the system self-increasing pressure finally reaches 6.0Mpa.

[0043] Using pyridine as a solvent, at a temperature of 120°C, the pyrolysis product was repeatedly washed and extracted until the filtrate became colorless and clear. Finally, the carbon-coated nano-Fe3O4 composite material with particle ...

Embodiment 3

[0045] Weigh 10 g of analytically pure isophthalic acid and 20 g of ferrocene according to a mass ratio of 1:2, and the other steps are the same as in Example 1. Finally, carbon-coated nano-Fe with a particle size distribution of 20-80nm is obtained 3 o 4 The composite material is analyzed by thermogravimetric analysis, and the content of metal oxide in the material is 38.3%. Using the same method as in Example 1 to carry out charge and discharge tests, the results show that the negative electrode material exhibits good cycle stability, the first discharge capacity is as high as 985mAh / g, and the capacity can be maintained after 30 cycles at a current density of 50mA / g. At 379mAh / g.

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Abstract

The invention relates to a lithium ion battery cathode material and a preparation method thereof. The cathode material comprises a carbon-coated nano-metal oxide composite material, wherein a carbon-coated nano-metal oxide has a nuclear shell structure, grains are uniformly dispersed, the diameter range of the grains is 10-80nm, and the thickness of a carbon coating is 2.5-10nm. An electrode made of the cathode material has higher reversible capacity and excellent cyclical stability.

Description

Technical field: [0001] The invention relates to a lithium ion battery negative electrode material and a preparation method thereof, belonging to the field of lithium ion secondary battery electrode materials. Background technique: [0002] Lithium-ion secondary batteries have the advantages of high voltage, high specific energy, long life, and no pollution. They have replaced nickel-cadmium batteries and nickel-metal hydride batteries in the field of small secondary batteries and become the mainstream of commercial secondary batteries. The rapid rise, the practical application of electric vehicles has received great attention from all over the world, and the application of lithium batteries in the automotive industry will become more and more popular, so higher requirements are put forward for chemical power materials. [0003] Compared with the current industrially used carbon anode materials (such as: natural graphite, artificial graphite), transition metal oxides have a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/139
CPCY02E60/122Y02E60/12Y02E60/10
Inventor 宋怀河付伯承周继升陈晓红
Owner 北京华科讯能石墨烯新技术研究院有限公司
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