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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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  • Summary
  • Abstract
  • 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, carbon nanotubes can only be evenly distributed on the surface of the electrode material, and a continuous three-dimensional conductive network cannot be formed inside the electrode material. And other issues

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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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Effect test

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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