Carbon-series/active-substance compound and preparation method thereof

A manufacturing method and composite technology, which can be applied to electrical components, electrochemical generators, battery electrodes, etc., can solve the problems of inability to reduce tin dioxide, electrical decay, and inability to effectively reduce the irreversible capacitance of the first cycle.

Inactive Publication Date: 2014-02-12
黄炳照
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This material can have a capacity of 521 mAh / g in the application of lithium-ion batteries, but due to the dual limitations of thermal carbon reduction temperature and low melting point of tin metal, the heat treatment temperature range of this material is limited to sintering below 400 °C, However, the metal tin particles reduced by hot carbon will separate from the carbon material and aggregate to a size of a few microns, and the electrical properties will decline rapidly.
However, the calcination temperature of only 400°C is not enough to completely carbonize the carbon-based matrix, so that the electrical conductivity of the material is not good, and the carbon-based matrix cannot effectively inhibit the aggregation of reducing active substances, so the reduction of tin dioxide cannot be performed. It also leads to the ineffective reduction of the first-cycle irreversible capacitance of the material

Method used

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  • Carbon-series/active-substance compound and preparation method thereof
  • Carbon-series/active-substance compound and preparation method thereof
  • Carbon-series/active-substance compound and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0046] First, 2.5 grams of graphite (Graphite), 2.5 grams of sodium nitrate (Sodium nitrate, NaNO 3 ) with 115 ml of sulfuric acid (Sulfuric acid, H 2 SO 4 ), uniformly mixed in a 500 ml ice-bath reaction flask, and stirred with a magnet. Then slowly add 7.5 grams of potassium permanganate (Potassium Permanganate, KMnO 4 ) and avoid the reaction temperature exceeding 20°C. Then the reaction bottle was moved to a 35°C water bath for 30 minutes of reaction. After the reaction was completed, 115 ml of deionized water was slowly added to the bottle, and the reaction temperature was raised to 98°C for 15 minutes of reaction. Then inject 350 ml of deionized water and 23 ml of 35% hydrogen peroxide (Hydrogen peroxide, H 2 o 2 ), and after waiting for natural cooling, the reactant was washed to neutrality by dialysis water washing to prepare a graphene oxide aqueous solution 21 (as shown in Figure 2(a) and 2(b)). Take 10 ml of 1 wt% graphene oxide aqueous solution 21, add 3.6 g ...

Embodiment 2

[0050] Add 3.6 g of glucose (>99.5%; preferably D(+) glucose) to 10 mL of deionized water, and stir with a magnet for 90 minutes to fully dissolve the glucose, then add 1 g of micron tin powder (>99%; Sigma -Aldrich) stirred for half an hour. After mixing evenly, the mixed solution was transferred into a 100 ml reaction kettle, and the pressure was 10 bar (Bar) and the temperature was 180° C., and the oil bath was continuously heated and stirred for 5 hours. After the reactor was naturally cooled, the black powder was taken out, rinsed with 500 ml of deionized water, and dried overnight in an oven at 80°C. Move 2.25 g of the dried powder to a place containing an inert gas (N 2 ), and controlled calcination at 400°C for 4 hours to produce nanoscale tin dioxide carbon composites.

Embodiment 3

[0052] Add 3.6 g of glucose (>99.5%; preferably D(+) glucose) to 10 ml of deionized water, and stir with a magnet for 90 minutes to fully dissolve the glucose, followed by adding 1 g of micron tin powder (>99%; Sigma -Aldrich) stirred for half an hour. After mixing evenly, the mixture was transferred into a 100 ml reaction kettle, and the mixture was continuously heated and stirred for 5 hours in an oil bath with a pressure of 10 bar (Bar) and a temperature of 180°C. After waiting for the reactor to cool down naturally, the black powder was taken out, rinsed with 500 ml of deionized water, and dried overnight in an oven at 80°C. Move the dried powder (about 2.25 g) to an inert gas mixture (5% H 2 & 95% Ar) and calcined at 600 °C for 4 hours to produce nanoscale metallic tin / carbon composites.

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Abstract

The invention discloses a carbon-series/active-substance compound and a preparation method thereof. The compound comprises: active particles with size of 1-100 nm and one-dimension or two-dimension carbon skeleton which are mutually connected via three-dimension carbon material, and the compound possesses the capability of storing both faraday charges and nonfaraday charges. The addition of multi-dimension carbon allotrope helps to substantially inhibit agglomeration phenomenon of active substances during synthesis and disintegration phenomenon of the active substances during electric charging-discharging, and a multi-dimension conduction network structure after stacking is formed, so that the conductive capability of the material is improved, and further the charging-discharging rate of the material is improved. The invention additionally provides a simple green synthetic method, and thus the carbon-series/active-substance compound possesses batch production potential, and becomes a potential green-energy storage material applicable to lithium ion secondary batteries, super-capacitance lithium-air batteries.

Description

technical field [0001] The present invention relates to a carbon-based active compound, in particular to a multi-dimensional structure high-capacity energy storage material and a manufacturing method thereof. The multi-dimensional carbon-based nanoscale active compound can be used to manufacture high-energy-density energy storage devices, especially It is a lithium-ion secondary battery core and a battery pack made by using it. Background technique [0002] In the 21st century, when the technological revolution and environmental awareness are on the rise, in order to cope with the rapid evolution of the new generation of technology and green energy products, consumers' performance requirements and demands for energy storage products are also growing simultaneously. For example, portable 3C products, such as mobile phones, PDAs, smart phones, notebook (tablet) computers, digital cameras, etc., or large-scale transportation such as electric vehicles, hybrid vehicles, etc. As ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/583
CPCH01M4/362H01M4/625H01M10/0525Y02E60/10
Inventor 黄炳照郑铭尧郑如翔黄正良邱则明
Owner 黄炳照
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