Cathode materials for carbon nano-tube composite lithium ion battery and preparation method thereof

A carbon nanotube composite, negative electrode material technology, applied in electrode manufacturing, battery electrodes, circuits, etc., can solve the problem that electrode materials cannot form a continuous three-dimensional conductive network, and achieve high production efficiency, excellent comprehensive performance, and improved permeability. Effect

Inactive Publication Date: 2010-06-30
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The purpose of the present invention is to provide a carbon nanotube composite lithium battery negative electrode material and its preparation method, so as to solve the problem that in the prior art,

Method used

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  • Cathode materials for carbon nano-tube composite lithium ion battery and preparation method thereof
  • Cathode materials for carbon nano-tube composite lithium ion battery and preparation method thereof
  • Cathode materials for carbon nano-tube composite lithium ion battery and preparation method thereof

Examples

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Embodiment 1

[0029] Embodiment 1: Synthetic carbon nanotube composite natural graphite negative electrode material

[0030] (1) Select carbon nanotubes with a length of 10-15 μm and a diameter of 50-150 nm as raw materials. Add 60 g of carbon nanotubes and 6 g of dispersant polyvinylpyrrolidone (PVP) into 2000 ml of deionized water; after ultrasonic dispersion, continue stirring and mixing at high speed to make a uniform dispersion of carbon nanotubes;

[0031] (2) with 6000g spherical natural graphite, the average particle diameter D50=19.6 μ m of natural graphite, tap density is 0.98g / cm 3 , with a specific surface area of ​​6.4m 2 / g, particle diameter is less than 5 μ m particle cumulative volume ratio is 3.1%, (002) interplanetary distance is 0.3365nm, and 6000g deionized water, join among the uniformly dispersed 60g carbon nanotube slurry that above-mentioned step 1 obtains, adopt The three-dimensional mixer performs full mixing in the liquid state, and after drying, a uniform mixt...

Embodiment 2

[0036] Embodiment 2: Synthesis of carbon nanotube composite artificial graphite negative electrode material

[0037] (1) Select carbon nanotubes with a length of 10-15 μm and a diameter of 50-150 nm as raw materials. Add 60 g of carbon nanotubes and 6 g of dispersant polyvinylpyrrolidone (PVP) into 2000 ml of deionized water; continue stirring and mixing at high speed after ultrasonic dispersion to make a uniform dispersion of carbon nanotubes;

[0038] (2) With 6000g artificial graphite, the average particle diameter D50=15.2 μm of artificial graphite, tap density is 0.98g / cm 3 , the specific surface area is 4.59m 2 / g, the distance between (002) planes is 0.3359nm, the reversible capacity of this graphite is 290mAh / g, and the first efficiency is 87.01%. Add the above-mentioned artificial graphite and 6000g of deionized water to the uniformly dispersed 60g of carbon nanotube slurry obtained in the above step 1, use a three-dimensional mixer to fully mix the liquid state, an...

Embodiment 3

[0043] Example 3: Synthesis of carbon nanotube composite mixed graphite negative electrode material

[0044] (1) Select carbon nanotubes with a length of 10-15 μm and a diameter of 50-150 nm as raw materials. Add 60 g of carbon nanotubes and 6 g of dispersant polyvinylpyrrolidone (PVP) into 2000 ml of deionized water; continue stirring and mixing at high speed after ultrasonic dispersion to make a uniform dispersion of carbon nanotubes;

[0045] (2) With 3000g spherical natural graphite, the average particle diameter of natural graphite D50=19.6 μm. And 3000g artificial graphite, the average particle diameter D50=15.2 μ m of artificial graphite, and 6000g deionized water, join among the uniformly dispersed 60g carbon nanotube slurry that above-mentioned step 1 obtains, adopt three-dimensional mixer to carry out liquid state and fully mix, After drying, a uniform mixture of artificial graphite, natural graphite and carbon nanotubes is obtained.

[0046] (3) Take 600 g of petr...

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Abstract

The invention belongs to the technical field of electrode materials for lithium ion batteries and particularly relates to long-cycle-life and high-compacted-density cathode materials for a carbon nano-tube composite lithium ion battery and a preparation method thereof. By adding carbon nano-tubes in situ in the preparation process of the cathode materials, the invention not only ensures that the carbon nano-tubes can be evenly dispersed on the surface of the cathode materials, but also achieves the even dispersion of the bulk phase inside the cathode materials, thereby forming a continuously penetrating three-dimensional carbon nano-tube conductive network. Accordingly, the invention prolongs the cycle life of the lithium ion battery and improves the seeping capacity of electrode sheets prepared from composite electrode materials; the prepared lithium ion battery has high-rate discharge performance; and the invention has the characteristic of low cost and is prone to industrialization. Therefore, the invention is expected to be applied to high-rate lithium ion batteries.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery electrode materials, and in particular relates to a carbon nanotube composite lithium-ion battery negative electrode material with high cycle life and high compaction density and a preparation method. Background technique [0002] As a new generation of high-energy secondary battery products, lithium-ion batteries have outstanding characteristics such as high discharge voltage, high specific energy and specific power, small self-discharge, and long cycle life. They have been widely used in mobile communication equipment, notebook computers, mobile phones, instruments, etc. instrumentation and other fields. Since commercialization in the 1990s, lithium-ion battery products have continued to develop rapidly at an annual rate of about 30%, and their market share has quickly surpassed other secondary battery products such as nickel-metal hydride batteries and nickel-cadmium batteries in ju...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/04
CPCY02E60/12Y02E60/10
Inventor 成会明闻雷英哲李峰王作明
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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