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Self-supporting flexible carbon nano-tube paper composite electrode material for lithium ion battery

A technology of carbon nanotube paper and lithium-ion batteries, which is applied in the fields of chemical engineering and energy and chemical engineering, to achieve the effects of promoting progress and development, improving performance, and avoiding capacity loss

Inactive Publication Date: 2012-07-18
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In order to further improve the conductivity of the positive pole piece, existing work replaces the above-mentioned conductive additive conductive carbon black with carbon nanotubes, and mixes and coats it with a binder. This method can further improve the conductivity of the pole piece to a certain extent (Zhang Qingtang , Qu Meizhen, etc. Patent Publication No.: CN1770515A), but still need to use binder and current collector

Method used

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  • Self-supporting flexible carbon nano-tube paper composite electrode material for lithium ion battery
  • Self-supporting flexible carbon nano-tube paper composite electrode material for lithium ion battery
  • Self-supporting flexible carbon nano-tube paper composite electrode material for lithium ion battery

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Embodiment 1

[0028] Carbon nanotubes with a diameter of 10 nanometers and a length of 50 micrometers prepared by the fluidized bed chemical vapor deposition process and vermiculite as a catalyst are used as raw materials; commercial LiFePO 4(particle size is 100 nanometers) is a positive electrode active material assembly carbon nanotube paper composite electrode material. Carbon nanotubes and lithium iron phosphate (LiFePO 4 ) particles were shear dispersed in 100mL N-methylpyrrolidone (carbon nanotube concentration 1mg / mL, LiFePO 4 Particle concentration 4mg / mL). Carbon nanotube paper / LiFePO was obtained on filter paper by vacuum filtration 4 The particle composite material can remove the carbon nanotube paper from the filter paper by drying. The carbon nanotube paper composite electrode has good flexibility and can undergo large elastic deformation under external force. The mass ratio of carbon nanotubes to active materials in the electrodes is 1:4. Scanning electron microscope obse...

Embodiment 2

[0030] The carbon nanotubes obtained by the planktonic chemical vapor deposition process are used as raw materials, with a diameter of 100 nanometers and a length of 1000 microns; cobalt oxide and lithium carbonate are used as raw materials, weighed according to the molar ratio of Li:Co=1:1, and mixed with carbon nanotubes Tube mixing for air shear dispersion. Perform high-temperature solid-phase synthesis at a high temperature of 800-900°C to obtain lithium cobaltate (LiCoO 2 ) particle / carbon nanotube composite structure, LiCoO 2 The particle size is 1 micron. The carbon nanotube composite material is placed in dimethylformamide for liquid phase shear dispersion, and the carbon nanotube paper material is obtained by filtering, and the carbon nanotube paper composite electrode material can be removed from the filter paper after drying. Next, the carbon nanotubes and LiCoO in the composite electrode 2 The mass ratio of the particles is 1:0.1, which exhibits excellent mechan...

Embodiment 3

[0032] The carbon nanotube obtained by thermal chemical vapor deposition process is used as a raw material, and the diameter of the carbon nanotube is 1 nanometer and the length is 0.5 micrometer. The carbon nanotubes were dispersed in FeSO through a liquid phase shearing process 4 In the solution, in an environment with a pH of about 10, oxygen induction and air oxidation are successively adopted to obtain ferric oxide (Fe 3 o 4 ) / carbon nanotube composite, wherein the particle size of ferric oxide is 50 nanometers, obtained through suction filtration and washing with ferric oxide as the carbon nanotube paper composite electrode of the negative active material, carbon nanotubes and carbon nanotubes in the electrode material The mass ratio of ferroferric oxide is 1:10, and the capacity can still maintain 400mAh / g after 100 cycles at a discharge intensity of 0.1C, and the capacity decay is less than 25% compared with the initial capacity, showing good cycle performance.

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Abstract

The invention discloses a self-supporting flexible carbon nano-tube paper composite electrode material for a lithium ion battery. A carbon nano-tube paper network of the material is formed by using interlaced carbon nano-tubes, and active anode material particles or cathode material particles of the lithium ion battery are compounded with carbon nano-tube paper to form the carbon nano-tube paper composite electrode material. In the electrode material, the carbon nano-tubes form an efficient three-dimensional conductive network, so that a better electron channel is provided for active material particles with low electrical conductivity. Because a bonding agent and a current collector are not needed, the electrode material has a higher active material ratio, and the performance of the electrode material is further improved. Meanwhile, the high mechanical property of the carbon nano-tube paper makes the composite electrode material show flexible characteristics, and as a flexible electrode material, the self-supporting flexible carbon nano-tube paper composite electrode material is hopeful to be widely used in next-generation flexible electronic equipment.

Description

field of invention [0001] The invention relates to an electrode material for a lithium ion battery, in particular to a self-supporting flexible carbon nanotube paper composite electrode material for a lithium ion battery, which belongs to the fields of chemical engineering and energy chemical industry. Background technique [0002] Lithium-ion batteries, as a class of batteries with high energy density, are currently widely used in personal electronic devices. However, as the performance of personal portable devices continues to leap forward, the requirements for supporting energy systems are also increasing. It is necessary to develop lithium-ion batteries with higher energy, higher power density, longer life, and even flexibility, so that Lithium-ion batteries for next-generation electronic devices. [0003] Lithium-ion batteries store and release electrical energy through the migration of lithium ions between the positive and negative active materials. The energy storag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38
CPCY02E60/12Y02E60/10
Inventor 魏飞黄佳琦张强刘晓斐朱万诚
Owner TSINGHUA UNIV
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