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Conductive polymer-carbon coated silicon oxide composite material and preparation method thereof

A conductive polymer and silicon oxide technology, applied in the direction of electrochemical generators, circuits, electrical components, etc., can solve the problems of poor cycle performance, poor conductivity, low initial charge and discharge efficiency, etc., to improve cycle performance and reduce manufacturing costs Low, beneficial to the effect of industrial production application

Active Publication Date: 2018-02-02
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The object of the present invention is to provide a conductive polymer-carbon-coated silicon oxide composite material and its preparation method, in order to improve the low initial charge and discharge efficiency, poor conductivity, and cycle performance of the silicon oxide material as the negative electrode material of lithium ion batteries. Bad question

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  • Conductive polymer-carbon coated silicon oxide composite material and preparation method thereof
  • Conductive polymer-carbon coated silicon oxide composite material and preparation method thereof
  • Conductive polymer-carbon coated silicon oxide composite material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0039] (1) Add 1000g of silicon oxide with a D50 of 10μm into the high-speed mixer, then add 100g of coal tar pitch with a D50 of 25μm, and 12g of starch as a pore-forming agent, and the mixing time in the high-speed mixer is 15min , obtain silicon oxide / bitumen / pore-forming agent mixture after mixing;

[0040] (2) Put the silicon oxide / pitch / pore-forming agent mixture obtained above into a rotary furnace, and sinter at a constant temperature of 300°C for 2 hours in a nitrogen atmosphere, and then raise it to 450°C for 4 hours to obtain a carbon coating The silicon oxide material precursor is then transferred to a tube furnace to continue carbonization at a high temperature of 900°C in a nitrogen atmosphere for 4 hours to obtain a carbon-coated silicon oxide material, which is crushed by jet milling before use;

[0041] (3) Take 20 g of carbon-coated silicon oxide in ethanol, add 0.2 g of 3-aminopropyltrimethoxysilane to reflux after magnetic stirring, the reflux temperature i...

Embodiment 2

[0045] (1) Add 1,000 g of silicon oxide with a D50 of 5 μm into the high-speed mixer, and then sequentially add 150 g of petroleum pitch with a D50 of 30 μm, and 20 g of starch as a pore-forming agent. The mixing time in the high-speed mixer is 25 minutes. Obtain silicon oxide / bitumen / pore-forming agent mixture after mixing;

[0046] (2) Put the silicon oxide / pitch / pore-forming agent mixture obtained above into a rotary furnace, and sinter at a constant temperature of 300°C for 8 hours in a nitrogen atmosphere, and then raise it to 550°C for 6 hours to obtain a carbon coating The silicon oxide material precursor is then transferred to a tube furnace and carbonized at a high temperature of 950°C in a nitrogen atmosphere for 7 hours to obtain a carbon-coated silicon oxide material, which is crushed by a jet milling method before use;

[0047] (3) Take 15g of carbon-coated silicon oxide in ethanol, add 0.075g of 3-ureapropyltrimethoxysilane after magnetic stirring, and reflux at ...

Embodiment 3

[0050] (1) Add 1000 g of silicon oxide with a D50 of 8 μm into the high-speed mixer, then add 120 g of petroleum asphalt with a D50 of 30 μm, and 15 g of urea as a pore-forming agent. The mixing time in the high-speed mixer is 12 minutes. Obtain silicon oxide / bitumen / pore-forming agent mixture after mixing;

[0051] (2) Put the silicon oxide / pitch / pore-forming agent mixture obtained above into a rotary furnace, and sinter at a constant temperature of 300°C for 6 hours in a nitrogen atmosphere, and then raise it to 520°C for 3 hours to obtain a carbon coating The silicon oxide material precursor is then transferred to a tube furnace to continue carbonization at a high temperature of 1000°C in a helium atmosphere for 5 hours to obtain a carbon-coated silicon oxide material, which is crushed by jet milling before use;

[0052] (3) Take 10 g of carbon-coated silicon oxide in ethanol, add 1.5 g of ethylenediaminepropyltriethoxysilane to reflux after magnetic stirring, the reflux te...

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Abstract

The invention discloses a conductive polymer-carbon coated silicon oxide composite material and a preparation method thereof. The conductive polymer-carbon coated silicon oxide composite material comprises a conductive polymer, a silane coupling agent, carbon and silicon oxide, wherein the carbon is directly coated on a surface of a silicon oxide particle, the silane coupling agent is absorbed toa surface of the carbon, and the conductive polymer is embedded into carbon gaps and also is uniformly coated on the surface of the carbon by a bridge chain effect of the silane coupling agent. The preparation method of the conductive polymer-carbon coated silicon oxide composite material comprises three steps of highly mixing the silicon oxide and a carbon source, performing high-temperature sintering (curing and carbonization) and coating the polymer. The prepared composite material is very uniform in coating structure and has relatively low volume expansion effect and excellent electrochemical performance, the initial charge-discharge efficiency can be obviously improved, and particularly, relatively poor cycle property of a silicon oxide negative electrode material is improved.

Description

technical field [0001] The invention relates to the field of negative electrode materials for lithium ion batteries, in particular to a conductive polymer-carbon-coated silicon oxide composite material and a preparation method thereof. Background technique [0002] In the early 1970s, Shirakawa et al. synthesized a polyacetylene film, and the conductivity was increased by nearly 100,000 times after doping, which was close to the conductivity of copper at room temperature. This discovery is an epoch-making event for the theoretical research of polymer chemistry and polymer physics. The transformation of the electrical properties of organic polymers from insulators to conductors is of great significance to the basic research of organic polymers. From the perspective of conductive mechanism, conductive polymers can be roughly divided into two categories: the first category is composite conductive polymer materials, which refer to structural polymer materials as the matrix, whic...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M10/0525
CPCH01M4/366H01M4/483H01M4/624H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 齐美洲郭钰静
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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