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Silicon-based negative electrode material and preparation method thereof

A technology of silicon-based anode materials and silicon nanoparticles, which is applied in nanotechnology for materials and surface science, battery electrodes, electrical components, etc., can solve problems such as loss of electrical contact, collapse of electrode structure, and cycle capacity decay. Effects of inhibiting decomposition, reducing contact area, and avoiding direct contact

Active Publication Date: 2018-12-04
RES INST OF XIAN JIAOTONG UNIV & SUZHOU
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The above-mentioned binder can maintain the structure stability of the silicon electrode in a certain cycle, but after multiple charge and discharge, the silicon particles will break away from the long-chain polymer, resulting in irreversible slip, breaking away from the current collector, losing electrical contact, and the electrode structure collapses. capacity decay

Method used

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

Examples

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Embodiment 1

[0049] This embodiment provides a method for preparing a silicon-based negative electrode material, see figure 1 , the specific method is as follows:

[0050] (1) Take 100 mg of SiNPs and 50 mg of citric acid CA, dissolve in 100 mL of ultrapure water, and stir magnetically for 12 hours to mix SiNPs and CA evenly.

[0051] (2) Seal the mixed sample with filter paper, freeze it in a refrigerator at -76°C for 2 hours, and then dry it in a small freeze dryer for 24 hours to obtain a SiNPs@CA sample.

[0052] (3) Take the SiNPs@CA sample, conductive carbon black and PVDF according to the mass ratio of 8:1:1, use N-methylpyrrolidone NMP as the solvent, mix the slurry, and stir it magnetically for 12 hours to prepare CA-PVDF as the SiNPs adhesive. The silicon-based anode material of the binder is hereinafter referred to as SiNPs(53%)@CA-PVDF.

[0053] The silicon-based negative electrode material of the present embodiment includes several SiNPs1, binder 3 and conductive carbon blac...

Embodiment 2

[0055] The silicon-based negative electrode material (hereinafter referred to as SiNPs(40%)@CA-PVDF) was prepared according to the method of Example 1, except that in step (1), the mass of citric acid CA was 100 mg.

Embodiment 3

[0057] The silicon-based negative electrode material (hereinafter referred to as SiNPs(27%)@CA-PVDF) was prepared according to the method of Example 1, except that in step (1), the mass of citric acid CA was 200 mg.

[0058] In order to prove that CA is coated on the surface of SiNPs, the phase composition of SiNPs@CA obtained in step (2) in Example 1-3 was analyzed by XRD, as figure 2 shown in . figure 2 Among them, SiNPs(67%)@CA, SiNPs(50%)@CA, SiNPs(33%)@CA respectively correspond to the products of step (2) in Examples 1, 2, and 3, and the percentages thereof represent SiNPs@CA samples The proportions of SiNPs are 67%, 50%, and 33%, respectively, and the meanings of the names in the drawings below are the same as here. It can be seen from the figure that after coating the surface of SiNPs with different contents of citric acid CA, the three samples all have obvious diffraction peaks at 2θ of 28.4°, 47.2°, 56.1°, 69.2°, and 79.5°, corresponding to The (111), (220), (311...

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Abstract

The invention relates to a silicon-based negative electrode material. The silicon-based negative electrode material includes a plurality of silicon nanoparticles and a binder. The silicon nanoparticles are interconnected by the binder. The binder includes citric acid and a macromolecular chain polymer, the citric acid is coated on the surfaces of the silicon nanoparticles, and the macromolecular chain polymer is connected to the citric acid on the surfaces of the silicon nanoparticles. The invention also provides a preparation method of the silicon-based negative electrode material. The methodincludes: mixing the silicon nanoparticles with citric acid in water evenly, then performing refrigeration at a temperature ranging from -60DEG C to -80DEG C for 2h or more, and then conducting drying to obtain citric acid coated silicon nanoparticles; and blending the citric acid coated silicon nanoparticles with the macromolecular chain polymer evenly in an organic solvent, thus obtaining the silicon-based negative electrode material. The synergistic effect of the double adhesives macromolecular chain polymer and CA is utilized to form a three-dimensional cross-linked structure serving as the binder of the silicon-based negative electrode material, thus enhancing the structural stability of the electrode material.

Description

technical field [0001] The invention relates to the technical field of electrode material preparation, in particular to a silicon-based negative electrode material and a preparation method thereof. Background technique [0002] Lithium-ion battery is currently one of the portable chemical power sources with the highest specific energy. Compared with other types of rechargeable batteries, lithium-ion batteries have high energy density, long charge and discharge life, no memory effect, little environmental pollution, and self- Low discharge and other advantages. Its development direction is from batteries used in mobile phones, notebook computers, digital cameras and portable small appliances, and batteries used in submarines, aerospace, and aviation fields, and gradually towards the field of electric vehicle power. As the global energy and environment are becoming more and more severe, vehicles have switched to energy storage batteries as the main power source, and the devel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/366H01M4/386H01M4/621H01M4/622H01M4/628H01M10/0525Y02E60/10
Inventor 王小兰徐慧金宏王红洁吴世超陈睿张亚文
Owner RES INST OF XIAN JIAOTONG UNIV & SUZHOU
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