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Silylene negative electrode plate capable of being directly used for preparing lithium ion battery and preparation and application of silylene negative electrode plate

A technology for lithium-ion batteries and negative plates, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of long reaction time of silicene, low product quality, and low yield of silicene, and avoid high-temperature and high-vacuum reactions Conditions, high process safety, and the effect of reducing production costs

Active Publication Date: 2022-01-18
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] For the preparation of silicene by epitaxial growth method, the output is low, the cost is high, and it is difficult to prepare in batches. The reaction time of silicene prepared by chemical method is long and the product quality is not high. Due to technical problems such as low silicene output and low efficiency, the present invention provides a preparation method that can be directly used to prepare silicene negative electrodes for lithium-ion batteries. It is a new method for preparing two-dimensional silicene materials. The obtained silicene As an active ingredient, it can be directly applied to lithium-ion battery anode materials

Method used

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  • Silylene negative electrode plate capable of being directly used for preparing lithium ion battery and preparation and application of silylene negative electrode plate
  • Silylene negative electrode plate capable of being directly used for preparing lithium ion battery and preparation and application of silylene negative electrode plate
  • Silylene negative electrode plate capable of being directly used for preparing lithium ion battery and preparation and application of silylene negative electrode plate

Examples

Experimental program
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Effect test

Embodiment 1

[0037] (1) Preparation of electrode foil: CaSi 2 , conductive carbon black, and polyvinylidene fluoride are mixed and dispersed in N-methylpyrrolidone at a mass ratio of 7:2:1, ultrasonicated at room temperature for 1 hour, stirred for 3 hours to form a uniform slurry, and the slurry is coated on copper foil On, vacuum drying to remove solvent to prepare electrode foil;

[0038] (2) Construction of the electrochemical reaction cell: use platinum wire as the cathode or anode, insert the platinum wire into the electrolyte of the reaction cell, use the electrode foil prepared in step (1) as the anode or cathode, and place the electrode foil on the reaction cell. Between the pool and the base, the electrolyte is a mixture of hydrochloric acid: ethanol = 1:10 (v / v) to construct an electrochemical reaction cell; the concentration of HCl in the hydrochloric acid is 37wt%;

[0039] (3) Carrying out the electrochemical reaction: on the electrochemical workstation, set the current dens...

Embodiment 2

[0041] The difference with Example 1 is only that the reaction time of step (3) is 10min, all the other steps and conditions are the same, and the scanning electron micrograph of the prepared silicene is as follows figure 2 as shown in b.

Embodiment 3

[0043] The only difference from Example 1 is that the current collector in step (1) uses carbon-coated copper foil, and the current density in step (3) is 50mA / cm 2 , the rest of the steps and conditions are the same, the scanning electron micrograph of the prepared silicene is as follows figure 2 as shown in c.

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Abstract

The invention discloses a silylene negative electrode plate capable of being directly used for preparing a lithium ion battery, a preparation method of the silylene negative electrode plate and application of the silylene negative electrode plate in preparation of the lithium ion battery. The preparation method comprises the following steps: (1) mixing and dispersing a silicon precursor, conductive carbon black and a binder in a solvent, performing ultrasonic treatment and stirring to form slurry, coating a current collector with the slurry, and performing vacuum drying to remove the solvent to obtain an electrode plate, wherein the silicon precursor is CaSi2 or MgSi2; and (2) inserting a platinum wire serving as a cathode or an anode into an electrolyte containing inorganic acid and an organic solvent, constructing an electrochemical reaction tank by taking the electrode plate prepared in the step (1) as the anode or the cathode, carrying out electrochemical reaction, cleaning the surface of the electrode plate after the reaction is finished, and carrying out vacuum drying to obtain the silylene negative electrode plate which can be directly used for preparing the lithium ion battery. The electrochemical reaction conditions are as follows: the current density is greater than or equal to 1mA / cm < 2 > and less than or equal to 300mA / cm < 2 >, and the reaction time is greater than or equal to 1min and less than or equal.

Description

technical field [0001] The invention relates to the field of preparation of two-dimensional silicene materials, in particular to a silicene negative plate that can be directly used to prepare lithium-ion batteries and its preparation and application. Background technique [0002] Silicon and carbon belong to Group IVA elements of the periodic table of elements. Similar to graphene, silicene is also a layered material with a honeycomb structure and is the thinnest two-dimensional form of silicon. Unlike graphene, the six silicon atoms of silicene on the honeycomb surface are not strictly on the same plane, but form a wrinkled and curved "chair-shaped" structure. Lithium ions can be intercalated between silicene layers, and the lattice constant of silicene is larger than that of graphite. When it is used as the negative electrode of lithium-ion batteries, its theoretical capacity can reach about three times that of graphite. The van der Waals force between the silicene layers...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/134H01M4/1395H01M4/38H01M4/62H01M10/0525
CPCH01M4/134H01M4/386H01M4/623H01M4/1395H01M10/0525Y02E60/10
Inventor 张校刚王华兰贺文杰刘雪李岩
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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