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Three-dimensional conductive network-supported porous silicon nanomaterial and preparation method and application thereof

A technology of nanomaterials and conductive networks, which is applied in the field of porous silicon nanomaterials and its preparation, can solve the problems of reduced specific capacity and energy density, no scalability, cumbersome synthesis process, etc., and achieves reduced production costs and good reliability. Scalability, the effect of simple preparation process

Inactive Publication Date: 2016-07-06
THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, the binder polyvinylidene fluoride (PVDF) used in traditional lithium-ion batteries greatly inhibits its performance when used in silicon anode materials (Science2011, 334, 75); although there are some modified adhesive However, on the one hand, the synthesis process of these binders is cumbersome, complicated, high cost, and not scalable; on the other hand, compared with traditional binders, Its dosage is large, which greatly reduces the specific capacity and energy density relative to the overall electrode weight

Method used

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  • Three-dimensional conductive network-supported porous silicon nanomaterial and preparation method and application thereof
  • Three-dimensional conductive network-supported porous silicon nanomaterial and preparation method and application thereof
  • Three-dimensional conductive network-supported porous silicon nanomaterial and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Mix porous silicon nanomaterials and graphene oxides converted from silica fume produced during the industrial smelting of metal silicon alloys in water at a mass ratio of 30:70, and prepare composite membranes by filtration. The obtained membranes After further drying for 12 h at 100 °C under hydrogen, a porous silicon nanomaterial supported by a three-dimensional graphene conductive network was prepared.

[0034] figure 2 For the AFM photo of the graphene oxide used in this embodiment; image 3 It is an optical photo of the porous silicon nanomaterial supported by three-dimensional graphene obtained in this example. from figure 2 , 3 It can be seen that the graphene oxide used in the present invention is a very thin two-dimensional sheet structure.

[0035] The porous silicon nanomaterial supported by the prepared three-dimensional graphene conductive network is directly used as the test electrode, and the metal lithium foil is used as the counter electrode. The...

Embodiment 2

[0037] Mix porous silicon nanomaterials and multi-walled carbon nanotubes in toluene at a mass ratio of 99:1, which are converted from silica fume produced during the industrial smelting of iron-silicon alloys, and prepare their composite films by spraying. Vacuum After drying, a porous silicon nanomaterial supported by a three-dimensional carbon nanotube conductive network is prepared.

[0038] Subsequent tests were as in Example 1. At a current density of 0.2C, the porous silicon nanomaterial supported by the three-dimensional carbon nanotube conductive network still has a specific capacity as high as 3100mAh / g; after 30 cycles, the capacity retention rate can reach 99%.

Embodiment 3

[0040]Mix porous silicon nanomaterials and bacterial cellulose in water at a mass ratio of 50:50, which are converted from silica fume produced during industrial smelting of metal silicon and iron-silicon alloys, and prepare composite films by drop coating , after the obtained film was heat-treated at 900°C for 0.5h in a mixed atmosphere of argon and hydrogen, a porous silicon nanomaterial supported by a three-dimensional carbon fiber conductive network was prepared.

[0041] Subsequent tests were as in Example 1. Under the current density of 0.2C, the porous silicon nanomaterial supported by the three-dimensional carbon fiber conductive network still has a specific capacity as high as 2550mAh / g; after 50 cycles, the capacity retention rate can reach 96%.

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Abstract

The invention discloses a three-dimensional conductive network-supported porous silicon nanomaterial and a preparation method and an application thereof. The three-dimensional conductive network-supported porous silicon nanomaterial is prepared by directly compounding a porous silicon nanomaterial converted from silica fume generated in the process of industrially smelting alloys of silicon metal, iron-silicon and the like and a conductive nanomaterial through filtering, spin-coating, drop-coating and / or spraying methods. The preparation method disclosed by the invention is low in cost, simple in process, low in energy consumption and large in scale; and the three-dimensional conductive network-supported porous silicon nanomaterial can be directly used as a negative electrode of a binderless lithium-ion battery and high in charge-discharge specific capacity and cycling stability.

Description

technical field [0001] The invention belongs to the field of energy storage electrodes, in particular to a porous silicon nanomaterial supported by a three-dimensional conductive network, a preparation method and application thereof. Background technique [0002] Lithium-ion batteries have become ideal power sources for portable electronic devices such as mobile phones and notebook computers due to their outstanding advantages such as high specific energy, large capacity, high voltage, low self-discharge, good cycle performance, and long service life. In order to meet the growing demand and develop higher-performance lithium-ion batteries, the development of new lithium-ion battery electrodes with high energy density, high power density, and long cycle life is an extremely important research direction in the field of lithium-ion battery research. . [0003] Silicon is a new type of negative electrode material for lithium-ion batteries. Its lithium storage reaction voltage p...

Claims

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Application Information

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IPC IPC(8): H01M4/134H01M4/1395H01M4/38B82Y30/00
CPCY02E60/10
Inventor 李祥龙张兴豪智林杰
Owner THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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