Sulfur-nitrogen co-doped graphene loaded nano-silicon three-dimensional electrode material and preparation method thereof

A three-dimensional electrode, nano-silicon technology, applied in nanotechnology, battery electrodes, nanotechnology, etc., can solve the problems of volume effect limiting practical application, low first cycle Coulomb efficiency, low conductivity of silicon materials, etc., to improve the cycle stability performance. , good cycle stability and excellent electrical conductivity

Active Publication Date: 2020-07-10
内蒙古杉杉科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the conductivity of silicon is low, and the volume effect of silicon greatly limits its practical application in the process of lithium intercalation and deintercalation.
[0003] Graphene's unique two-dimensional structure and remarkable mechanical properties, outstanding electronic properties, good electrical conductivity and wide electrochemical window and other excellent physical and chemical properties It has attracted extensive research and attention in various fields, but graphene also has obvious shortcomings as an anode material for lithium-ion batteries. The charge-discharge curve of pure graphene is very similar to that of hard carbon and activated carbon materials with high specific surface area, and both have the first cycle Coulombic efficiency. Low, high charging and discharging platform, serious potential hysteresis and other shortcomings

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  • Sulfur-nitrogen co-doped graphene loaded nano-silicon three-dimensional electrode material and preparation method thereof
  • Sulfur-nitrogen co-doped graphene loaded nano-silicon three-dimensional electrode material and preparation method thereof
  • Sulfur-nitrogen co-doped graphene loaded nano-silicon three-dimensional electrode material and preparation method thereof

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Embodiment 1

[0034] Embodiment 1: as figure 1 and figure 2 As shown, a sulfur-nitrogen co-doped graphene-loaded nano-silicon three-dimensional electrode material, which includes graphene doped with sulfur atoms and nitrogen atoms, the electrode reactivity of the doped graphene has been significantly improved, and then improved The electrochemical performance of the electrode material is improved; graphene has an intricate three-dimensional network structure, and nano-silicon is distributed between the graphene sheets, which provides a space for silicon to expand during charge and discharge, and greatly improves the cycle stability of silicon electrodes. ; The average particle size of nano-silicon is 3-10nm.

[0035] The doped sulfur atoms exist in the form of sulfide, S-S / S-C, S-O and salt-SOn-, the doped nitrogen atoms exist in three types: pyridinic-N, pyrrolic-N and Quaternary-N, and the doping of S and N atoms The amount is about 2%, and the nano-silicon accounts for about 10-20% of...

Embodiment 2

[0037] Embodiment 2: a kind of method for preparing sulfur and nitrogen co-doped graphene loaded nano-silicon three-dimensional electrode material, it comprises the following steps: (1) select raw material; (2) mix; (3) hydrothermal synthesis; (4) natural Cooling; (5) impurity removal and drying;

[0038](1) Selection of raw materials: Select the sulfur and nitrogen source doping solution, graphene oxide dispersion and nano-silica colloidal solution respectively according to the ratio of 7:1.5:1; the concentration of the sulfur and nitrogen source doping solution is about 100 mg / ml; The concentration in the graphene dispersion is about 4mg / ml; the concentration of the nano-silica colloidal solution is about 3mg / ml;

[0039] The sulfur and nitrogen source doping solution not only provides S and N atoms for electrode materials, but also can be used as a reducing agent for graphene oxide to reduce it to graphene with a three-dimensional network structure, which has the effect of ...

Embodiment 3

[0051] Embodiment 3: a kind of method for preparing sulfur and nitrogen co-doped graphene loaded nano-silicon three-dimensional electrode material, it comprises the following steps: (1) select raw material; (2) mix; (3) hydrothermal synthesis; (4) natural Cooling; (5) impurity removal and drying;

[0052] (1) Selection of raw materials: Select the sulfur and nitrogen source doping solution, graphene oxide dispersion and nano-silica colloidal solution respectively according to the ratio of 5:1.5:1; the concentration of the sulfur and nitrogen source doping solution is about 100 mg / ml; The concentration in the graphene dispersion is about 4mg / ml; the concentration of the nano-silica colloidal solution is about 3mg / ml;

[0053] The sulfur and nitrogen source doping solution not only provides S and N atoms for electrode materials, but also can be used as a reducing agent for graphene oxide to reduce it to graphene with a three-dimensional network structure, which has the effect of...

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Abstract

The invention discloses a sulfur-nitrogen co-doped graphene loaded nano-silicon three-dimensional electrode material and a preparation method thereof. The electrode material comprises graphene doped with sulfur atoms and nitrogen atoms, graphene is of a complex three-dimensional network structure, and nano-silicon is distributed between graphene sheet layers; the preparation method comprises the following steps: (1) selecting raw materials; (2) mixing; (3) performing hydrothermal synthesis; (4) performing naturally cooling; and (5) removing impurities and drying. The preparation method has thebeneficial effects that the electrode material provided by the invention is good in cycling stability and excellent in conductivity; in the lithium intercalation-deintercalation process, the initialenergy density of the electrode is improved, and the initial cycle coulombic efficiency, the cycle performance and the rate capability are relatively high; the preparation method disclosed by the invention is simple, and meanwhile, the complexity of an electrode plate manufacturing process is reduced due to the design of a three-dimensional structure.

Description

Technical field: [0001] The patent of the invention belongs to the field of preparation of lithium-ion battery materials, and specifically relates to a sulfur-nitrogen co-doped graphene-loaded nano-silicon three-dimensional electrode material and a preparation method thereof. Background technique: [0002] Nowadays, with the rapid development of science and technology, the demand for new energy is also increasing; among them, with the gradual acceleration of the development of new energy electric vehicles, lithium-ion batteries are widely used in electric vehicles due to their excellent electrochemical properties. superior. Moreover, the negative electrode material in lithium-ion batteries is one of the key factors affecting battery performance. The commercialized graphite negative electrode material has a theoretical specific capacity of only 372mAh / g, which cannot meet the requirements of the new generation of lithium-ion batteries. Silicon and lithium can form a lithium-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/583H01M10/0525B82Y30/00
CPCH01M4/366H01M4/386H01M4/583H01M10/0525B82Y30/00Y02E60/10
Inventor 李俊利耿海龙刘金峰姚恩东刘智君
Owner 内蒙古杉杉科技有限公司
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