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High-magnification niobium-tungsten oxide fast-charging electrode materials as well as preparation method and application thereof

An oxide, high-rate technology, applied in battery electrodes, circuits, secondary batteries, etc., to achieve the effect of increasing volumetric energy density and overcoming poor electronic conductivity

Inactive Publication Date: 2019-06-25
武汉瑞科美新能源有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the above-mentioned problems existing in the existing electrode materials, a high-rate niobium-tungsten oxide fast charging electrode material and its preparation method and application are provided, aiming to provide a method that can effectively improve the volumetric energy density and usage of lithium-ion secondary batteries. Niobium-tungsten oxide fast-charging electrode material that solves the problem of fast charging and discharging of lithium-ion secondary batteries

Method used

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  • High-magnification niobium-tungsten oxide fast-charging electrode materials as well as preparation method and application thereof
  • High-magnification niobium-tungsten oxide fast-charging electrode materials as well as preparation method and application thereof
  • High-magnification niobium-tungsten oxide fast-charging electrode materials as well as preparation method and application thereof

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Embodiment 1

[0023] NbO 2 (purchased from Alfa Aesar, 99+%) and WO 2 (purchased from Alfa Aesar, 99+%) was mixed according to the mass ratio of 16:5 and manually ground in a mortar for 1 h, then pressed into a block with a pressure of 10 MPa, and then placed in a metal platinum crucible at 10 ° C / Min heating rate is heated from room temperature to 1200 °C, and finally cooled to room temperature in air for about 2 hours to obtain a high rate niobium tungsten oxide fast charging electrode material Nb 16 W 5 o 55 .

[0024] Such as figure 1 As shown, the electrode material Nb provided in the embodiments of the present invention 16 W 5 o 55 The shape is uniform and the size reaches the micron level.

[0025] In the present invention, grind the above-mentioned electrode material with conductive agent acetylene black and binder PVDF (polyvinylidene fluoride) according to the mass ratio of 8:1:1, add solvent NMP (methylpyrrolidone) for half an hour, and stir at room temperature Prepare...

Embodiment 2

[0028] NbO 2 (purchased from Alfa Aesar, 99+%) and WO 2 (purchased from Alfa Aesar, 99+%) was mixed according to the mass ratio of 18:16 and manually ground in a mortar for 1 h, then pressed into a block with a pressure of 10 MPa, and then placed in a metal platinum crucible at 10 ° C / Min heating rate is heated from room temperature to 1200 °C, and finally cooled to room temperature in air for about 2 hours to obtain a high rate niobium tungsten oxide fast charging electrode material Nb 18 W 16 o 93 .

[0029] In the present invention, grind the above-mentioned electrode material with conductive agent acetylene black and binder PVDF (polyvinylidene fluoride) according to the mass ratio of 8:1:1, add solvent NMP (methylpyrrolidone) for half an hour, and stir at room temperature Prepare a slurry for 6 hours, and then evenly coat the prepared slurry on the copper foil with a scraper to prepare a pole piece. The pole piece is punched into a disc and used as a working electro...

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Abstract

The invention relates to high-magnification niobium-tungsten oxide fast-charging electrode materials as well as a preparation method and application thereof, and the preparation method comprises: mixing NbO2 and WO2, performing grinding and pressing into blocks, heating the blocks to 1200 DEG C from room temperature, and performing air-cooling to cool to room temperature. Two micron-sized Nb16W5O55 and Nb18W16O93 niobium-tungsten oxides are prepared to serve as lithium ion battery negative electrode materials by a high-temperature thermal oxidation method, the micron-sized active materials canundergo delithiation and lithium intercalation reactions in a few minutes, and have great significance for high-power fast-charging devices, the micron-scale structures can effectively improve the overall volume energy density of batteries, so that a traditional electrode material nano structure strategy is broken through, and the problem of poor ion diffusion and electron conductivity can be effectively overcome by virtue of a sub-stable crystal structure.

Description

technical field [0001] The invention relates to the technical field of energy storage, in particular to a high-rate niobium-tungsten oxide fast charging electrode material and a preparation method and application thereof. Background technique [0002] Batteries play an important role in practical applications in our lives, including electronic consumption, powering automobiles, stationary loads for intermittent renewable energy generation, etc. [0003] However, the current commercial batteries can no longer meet the needs of the rapid development of society, such as portable electronic devices, electric vehicles, network energy storage systems, etc. Now the development of batteries needs to have higher energy density and faster charge and discharge speed , and to increase the power and reduce charging time of Li-ion batteries, new high-rate electrode materials are needed that can store a large amount of charge within a few minutes. [0004] The most intuitive and commonly ...

Claims

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Application Information

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IPC IPC(8): C04B35/495C04B35/622H01M4/48H01M10/0525
CPCY02E60/10
Inventor 罗巧玲
Owner 武汉瑞科美新能源有限责任公司
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