Preparation method for silicon-carbon negative electrode material and silicon-carbon negative electrode material prepared by adopting method

A negative electrode material, silicon carbon technology, applied in battery electrodes, electrical components, circuits, etc., can solve problems affecting the electrochemical performance of silicon carbon materials, weak adhesion, etc., achieve excellent electrochemical performance, smooth filling, and reduce dispersion effect of difficulty

Inactive Publication Date: 2017-08-22
GUANGDONG ZHUGUANG NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, the bonding force between the nanostructured silicon-based material and the conductive agent is weak, and it is easy to cause...

Method used

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  • Preparation method for silicon-carbon negative electrode material and silicon-carbon negative electrode material prepared by adopting method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Embodiment 1, differs from comparative example in that this embodiment comprises the following steps:

[0039] Step 1, dry-mix lithium metal powder, elemental silicon with a diameter of 100 nm, and graphite particles with a particle size of 6 μm until uniform;

[0040] Step 2, select the electrolyte solution with lithium hexafluorophosphate as the salt and PC as the solvent, add it to the above mixture and continue stirring. At this time, under the action of metal lithium powder, PC will peel off the graphite particles to form an open structure, and at the same time, the elemental silicon particles will fill into the mouth structure;

[0041] Step 3, after the filling is completed, the electrolyte components are removed, coated and carbonized to obtain a silicon-carbon negative electrode material.

[0042] The rest are the same as the comparative example and will not be repeated here.

Embodiment 2

[0043] Embodiment 2 is different from the comparative example in that the present embodiment comprises the following steps:

[0044] Step 1, mixing and kneading elemental silicon with a diameter of 100 nm, graphite particles with a particle size of 6 μm, and an electrolyte with lithium hexafluorophosphate as the salt and PC as the solvent until uniform;

[0045] Step 2, assemble the counter electrode with lithium iron phosphate as the power source material, and then form the counter electrode with the material obtained in step 1, connect the external circuit, charge with a current of 1A, peel off the graphite particles, and form a graphite sheet opening structure; Afterwards, the nano-silicon particles will continue to fill into the opening structure of the graphite sheet;

[0046] Step 3, after the filling is completed, the electrolyte components are removed, coated and carbonized to obtain a silicon-carbon negative electrode material.

[0047] The rest are the same as the c...

Embodiment 3

[0048] Embodiment 3 is different from Embodiment 1 in that this embodiment includes the following steps:

[0049] Step 1, dry mixing and kneading lithium metal powder, elemental silicon with a diameter of 100 nm, methyl methacrylate, tetraethoxysilane, and graphite particles with a particle size of 6 μm until uniform;

[0050] Step 2, select the electrolyte solution with lithium hexafluorophosphate as the salt and PC as the solvent, add it to the above mixture and continue stirring. At this time, under the action of metal lithium powder, PC will peel off the graphite particles to form an open structure, and at the same time, the elemental silicon particles will fill into the opening structure;

[0051] Step 3, dissolving tert-butyl peroxybenzoate in PC to form an initiator solution, after the filling described in step 3 is completed, add the initiator solution, increase the temperature, and impel the polymerization reaction of the polymer monomer, in the elemental silicon A p...

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Abstract

The invention belongs to the energy storage and research field and particularly to a preparation method for a silicon-carbon negative electrode material. The method mainly comprises the steps of 1, performing dry mixing on a power source material 1, nanometer silicon granules and graphite granules until the mixture is mixed uniformly; 2 adding an electrolyte 1, continuing to mix to form an ionic channel, and under the effect of the power source material, performing stripping of the graphite granules to form a graphite sheet layer opening structure; under the mix acting force, constantly filling the graphite sheet layer opening structure with the nanometer silicon granules; or step 1', performing uniform mixing on nanometer silicon granules, graphite granules and an electrolyte 2 for use; step 2', performing assembling on the power source material 2 and the product obtained in the step 1' to form counter electrodes, applying a current to the space between the two electrodes, and performing stripping of the graphite granules to form a graphite sheet layer opening structure, and then constantly filling the graphite sheet layer opening structure with the nanometer silicon granules; and step 3, after complete filling, removing the electrolyte component, and performing coating and carbonization to obtain the silicon-carbon negative electrode material. When a silicon-carbon negative electrode is prepared by adopting the method, the graphene granule sheet layer opening and silicon nanometer granule filling can be carried out at the same time, so that filling can be performed more smoothly, thereby ensuring the excellent electrochemical performance of the silicon-carbon negative electrode material.

Description

technical field [0001] The invention belongs to the technical field of energy storage materials, and in particular relates to a method for preparing a silicon-carbon negative electrode material and a silicon-carbon negative electrode material prepared by the method. Background technique [0002] Lithium-ion batteries have brought revolutionary changes to the field of energy storage since their birth, and are widely used in various in portable electronic devices and electric vehicles. However, with the improvement of people's living standards, higher user experience puts forward higher requirements for lithium-ion batteries: lighter weight, longer service life, etc.; in order to solve the above problems, it is necessary to find new electrode materials with better performance. [0003] The current commercial lithium-ion battery anode material is mainly graphite, but its theoretical capacity is only 372mAh g -1 , can no longer meet the urgent needs of users; therefore, the de...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/62
CPCH01M4/364H01M4/625Y02E60/10
Inventor 毛方会
Owner GUANGDONG ZHUGUANG NEW ENERGY TECH
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