Positive electrode material for lithium ion cells and preparation method thereof

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, circuits, electrical components, etc., can solve the problem of poor rate characteristics and cycle stability of vanadium pentoxide nanomaterials, poor stability of layered structures, and unsuitability for large currents Charge and discharge and other issues, to achieve the effect of facilitating transportation, improving capacity and cycle stability, and improving rate characteristics

Inactive Publication Date: 2012-02-29
CHANGZHOU POWERGENIE MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the layered structure of vanadium oxide compound and lithium vanadate is not stable enough. During the charging and discharging process, the multiple phase transitions of lithium ion intercalation / deintercalation process make the capacity of the material decay quickly and the cycle performance is poor; Suitable for high current charge and discharge, poor rate characteristics
These defects of vanadium pentoxide limit its commercial application
However, the rate characteristics and cycle stability of the vanadium pentoxide nanomaterials reported in the literature and the prior art are relatively poor, and the experimental process is complicated, the conditions are not easy to control, and the synthesis cost is high.

Method used

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  • Positive electrode material for lithium ion cells and preparation method thereof
  • Positive electrode material for lithium ion cells and preparation method thereof
  • Positive electrode material for lithium ion cells and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1. Mix 1.0 g of vanadium pentoxide and 1.0 g of mesoporous carbon at room temperature, and grind with a mortar until the color is uniform. Then the powder is placed in a tube furnace, and under the protection of inert gas nitrogen, the temperature is raised from room temperature to 750 °C at a rate of 5 °C / min and sintered at a constant temperature of 750 °C for 20 minutes at a high temperature. After cooling to room temperature, di Composites of vanadium and mesoporous carbon.

[0024] 2. Place the obtained composite in a muffle furnace, heat up to 650°C from room temperature at a heating rate of 5°C / min, calcinate in air and at a constant temperature of 650°C for 40 minutes, remove the mesoporous carbon to obtain a porous five Vanadium oxide.

Embodiment 2

[0026] 1. Mix 1.0 g of vanadium pentoxide and 1.0 g of mesoporous carbon at room temperature, and grind with a mortar until the color is uniform. Then the powder is placed in a tube furnace, and under the protection of inert gas nitrogen, the temperature is raised from room temperature to 750 °C at a rate of 5 °C / min and sintered at a constant temperature of 750 °C for 20 minutes at a high temperature. After cooling to room temperature, di Composites of vanadium and mesoporous carbon.

[0027] 2. Place the obtained composite in a muffle furnace, heat up to 600°C from room temperature at a heating rate of 5°C / min, calcinate in air and at a constant temperature of 600°C for 45 minutes, remove the mesoporous carbon to obtain porous five Vanadium oxide.

Embodiment 3

[0029] 1. Mix 1.0 g of ammonium metavanadate and 1.0 g of mesoporous carbon at room temperature, and grind with a mortar until the color is uniform. Then the powder is placed in a tube furnace, and under the protection of inert gas nitrogen, the temperature is raised from room temperature to 750 °C at a rate of 5 °C / min and sintered at a constant temperature of 750 °C for 20 minutes at a high temperature. After cooling to room temperature, di Composites of vanadium and mesoporous carbon.

[0030] 2. Place the obtained composite in a muffle furnace, heat up to 650°C from room temperature at a heating rate of 5°C / min, and calcinate in air and at a constant temperature of 650°C for 45 minutes to remove the mesoporous carbon to obtain porous five Vanadium oxide.

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Abstract

The invention relates to a positive electrode material for lithium ion cells and a preparation method thereof. The material provided by the invention is porous vanadic anhydride with an amorphous carbon layer on the surface of vanadic anhydride, wherein the weight friction of vanadic anhydride is 80-99.9% and the weight friction of carbon is 0.1-20%. In comparison with the prior art, the preparation method provided by the invention has advantages of simple technological process, short reaction time, low production cost and the like.

Description

technical field [0001] The invention relates to a lithium ion battery cathode material and a preparation method thereof, in particular to a preparation method corresponding to the porous vanadium pentoxide of the lithium ion battery cathode material. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, high power density, high working voltage, light weight, long cycle life, good safety performance, and no memory effect. As a new type of energy storage device, the development of lithium-ion batteries and lithium-ion battery energy storage systems will surely promote the effective use of renewable energy and the development of new energy vehicles, which is of great significance for solving energy shortages and reducing environmental pollution. Further improving the performance of lithium-ion batteries and reducing costs are the prerequisites for their effective application. As an important part of lithium-ion batteries, electrode mat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48
CPCY02E60/10
Inventor 王开学张晓菲陈接胜
Owner CHANGZHOU POWERGENIE MATERIALS
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