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Silicon-based negative electrode material and method thereof

A silicon-based negative electrode material, nano-silicon technology, applied in battery electrodes, electrical components, electrochemical generators, etc., can solve the problems of small selection of carbon-silicon negative electrode materials and single preparation methods, so as to avoid thickening and increase capacity and cycle performance

Active Publication Date: 2014-10-22
CHERY AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The preparation method in the prior art is single, and those skilled in the art have little choice when preparing carbon-silicon negative electrode materials

Method used

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  • Silicon-based negative electrode material and method thereof
  • Silicon-based negative electrode material and method thereof
  • Silicon-based negative electrode material and method thereof

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preparation example Construction

[0046] In the third aspect, the embodiment of the present invention provides a method for preparing a silicon-based negative electrode material, with figure 2 For the preparation flow chart of this method, as attached figure 2 As shown, the method includes:

[0047] Step 101, dissolving nano-silicon particles and phenolic resin in an organic solution of oxides, stirring until uniformly mixed to obtain a mixed solution, the oxides including at least one of titanium dioxide, aluminum oxide, aluminum trichloride, and silicon dioxide kind.

[0048] Wherein, in step 101, the organic solution must be a solvent for both the phenolic resin and the above-mentioned oxides, so that the nano-silicon particles form a uniform dispersion system therein.

[0049] The above-mentioned organic solution in titanium dioxide, aluminum oxide, aluminum trichloride, and silicon dioxide can be obtained by performing a hydrolysis reaction in an organic solvent using a titanium compound, an aluminum co...

Embodiment 1

[0071] 1) Mix 1ml of tetrabutyl titanate with 9g of ethanol and stir for 2h to obtain a titanium dioxide solution. 0.1 g of nano-silicon particles were added to the titanium dioxide solution, and 1.0 g of phenolic resin was added at the same time, and stirred at 70° C. for 1 h to obtain a mixed solution.

[0072] 2) The above mixed solution was drawn into filamentous fibers by electrospinning, and dried at 50° C. for 10 minutes to obtain cured fibers.

[0073] 3) Under an inert gas environment, place the solidified fiber in a calciner, and at the same time pass methane into the calciner, calcinate at a temperature of 850° C. for 10 minutes, and then cool to room temperature to obtain a carbon-coated cured fiber .

[0074] 4) At normal temperature, the carbon-coated solidified fiber is corroded by hydrofluoric acid with a mass fraction of 10%, to remove titanium dioxide and phenolic resin therein, and obtain the desired silicon-based negative electrode material of the present ...

Embodiment 2

[0076] 1) Mix 1.2ml of isopropyl titanate with 9g of ethanol and stir for 2 hours to obtain a titanium dioxide solution. 0.1 g of nano-silicon particles were added to the titanium dioxide solution, and 1.0 g of phenolic resin was added at the same time, and stirred at 70° C. for 1 h to obtain a mixed solution.

[0077] 2) The above mixed solution was drawn into filamentous fibers by electrospinning, and dried at 20° C. for 15 minutes to obtain cured fibers.

[0078] 3) Under an inert gas environment, place the solidified fiber in a calciner, and at the same time pass toluene into the calciner, calcinate at a temperature of 500 ° C for 15 minutes, and then cool to room temperature to obtain a carbon-coated cured fiber .

[0079] 4) At normal temperature, the carbon-coated solidified fiber is corroded by hydrofluoric acid with a mass fraction of 10%, to remove titanium dioxide and phenolic resin therein, and obtain the desired silicon-based negative electrode material of the pr...

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Abstract

The invention discloses a silicon-based negative electrode material and a preparation method thereof, belonging to the field of negative electrode materials of lithium ion batteries. The silicon-based negative electrode material comprises a carbon tube and nanometer silicon particles in the carbon tube. Since gaps exist in the carbon tube, the silicon particles can be fixed in the limited space in the carbon tube, which enables volume expansion or shrinkage of the silicon particles to be in the limited space; thus, influence on electron transport performance between an active material and a current collector is avoided, thickening of an SEI membrane is prevented, and the capacity and cycle performance of a lithium battery are improved.

Description

technical field [0001] The invention relates to the field of negative electrode materials for lithium ion batteries, in particular to a silicon-based negative electrode material and a method thereof. Background technique [0002] Lithium battery (that is, lithium ion battery) is a rechargeable battery that uses carbon active material as the negative electrode and a lithium-containing compound as the positive electrode. The charging and discharging process is the intercalation and deintercalation process of lithium ions: when charging, lithium ions are deintercalated from the positive electrode, pass through the electrolyte and separator, and embed in the negative electrode. The more lithium ions are embedded in the negative electrode, the higher the specific charge capacity of the battery On the contrary, during discharge, lithium ions are deintercalated from the negative electrode, pass through the electrolyte and separator, and intercalate into the positive electrode. The ...

Claims

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Application Information

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IPC IPC(8): H01M4/134H01M4/1395
CPCH01M4/134H01M4/1395H01M4/386H01M10/0525Y02E60/10
Inventor 王秀田曾绍忠赵志刚陈效华
Owner CHERY AUTOMOBILE CO LTD
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