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Silicon-carbon cathode material and method for preparing same

A negative electrode material, silicon carbon technology, applied in battery electrodes, electrical components, circuits, etc., can solve the problems of ion obstruction, affecting the kinetic properties of silicon carbon materials, etc., to achieve simple and easy methods, excellent electrochemical performance, and improved electrical Effects of chemical properties

Active Publication Date: 2017-06-27
GUANGDONG ZHUGUANG NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, its two-dimensional sheet structure has an obvious hindering effect on the transport of ions inside and outside the silicon-carbon negative electrode particles, thus affecting the dynamic performance of silicon-carbon materials.

Method used

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  • Silicon-carbon cathode material and method for preparing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment 1, differs from comparative example in that this embodiment comprises the following steps:

[0033] Step 1, select the modified graphene (the graphene sheet contains hydroxyl, carboxyl, etc.) that the thickness of the sheet is 1nm and the plane size of the sheet is 40 μm, dissolve in water to obtain a solution, and then spray into the coating chamber, and make It has a negative charge of 10e;

[0034] Step 2. Preparation of core structure: select 100nm silicon particles, mix them uniformly with the conductive agent components, and then spheroidize to obtain a secondary particle core structure with a particle diameter of about 12 μm, and then spray it into the coating chamber, and make it with Has a positive charge of 20e;

[0035] Step 3, adjusting the airflow in the coating chamber, so that the particles in step 1 are evenly coated on the surface of the nuclear structure described in step 2 under the action of negative charges;

[0036] Step 4, water vapor...

Embodiment 2

[0037] Embodiment 2 is different from Embodiment 1 in that this embodiment includes the following steps:

[0038]Step 1, select the modified graphene (the graphene sheet contains hydroxyl, carboxyl, etc.) that the thickness of the sheet is 1nm and the plane size of the sheet is 40 μm, dissolve in water to obtain a solution, and then spray into the coating chamber, and make It has a negative charge of 10e;

[0039] Step 2. Preparation of core structure: Select 100nm silicon particles, mix them evenly with the conductive agent components, and then spheroidize to obtain a secondary particle core structure with a particle diameter of about 12 μm, and then spray it into the coating chamber, and make it with Has a positive charge of 100e;

[0040] Others are the same as in Example 1, and will not be repeated here.

Embodiment 3

[0041] Embodiment 3 is different from Embodiment 1 in that this embodiment includes the following steps:

[0042] Step 1, select the modified graphene (the graphene sheet contains hydroxyl, carboxyl, etc.) that the thickness of the sheet is 1nm and the plane size of the sheet is 40 μm, dissolve in water to obtain a solution, and then spray into the coating chamber, and make It has a negative charge of 10e;

[0043] Step 2. Preparation of core structure: Select 100nm silicon particles, mix them evenly with the conductive agent components, and then spheroidize to obtain a secondary particle core structure with a particle diameter of about 12 μm, and then spray it into the coating chamber, and make it with Has a positive charge of 500e;

[0044] Others are the same as in Example 1, and will not be repeated here.

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Abstract

The invention belongs to the field of research on energy storage, and particularly relates to a silicon-carbon cathode material and a method for preparing the same. The silicon-carbon cathode material comprises core structures and shell structures. The shell structures are uniformly coated on the surfaces of the core structures, and the thicknesses h of the shell structures are smaller than or equal to 100 nm. The method for preparing the silicon-carbon cathode material includes steps of 1, preparing coating layer slurry with graphene, feeding sprayed mist in coating chambers and allowing formed particles to carry electric charge; 2, spraying components of the core structures into the coating chambers and allowing the surfaces of the components of the core structures to carry electric charge opposite to the electric charge of the particles; 3, carrying out coating reaction, to be more specific, regulating gas flow in the coating chambers and uniformly coating the particles obtained at the step 1 on the surfaces of the core structures obtained at the step 2; 4, carrying out after-treatment to obtain finished products which are silicon-carbon particles. The electrified capacity of each particle at the step 1 is Q1. The electrified capacity of each particle on the surface of the corresponding component of the corresponding core structure is Q2. The silicon-carbon cathode material and the method have the advantage that the silicon-carbon cathode material prepared by the aid of the method is excellent in performance.

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): H01M4/36H01M4/38H01M4/583
CPCH01M4/366H01M4/386H01M4/583Y02E60/10
Inventor 毛方会杨玉洁
Owner GUANGDONG ZHUGUANG NEW ENERGY TECH
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