A kind of two-dimensional nanostructure electrolyte additive, preparation method and application

A two-dimensional nanostructure, electrolyte additive technology, applied in the fields of electrolyte battery manufacturing, nanotechnology, secondary batteries, etc., can solve problems such as the decrease of additive concentration and the inability to meet long-term stability, and achieve better thickness control and improvement. Conductivity and ion mobility number, the effect of uniform interaction

Active Publication Date: 2021-04-06
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the electrolyte additives in the prior art are continuously consumed during the alkali metal deposition / stripping process, resulting in a decrease in the concentration of the additives, which cannot meet the long-term stability

Method used

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  • A kind of two-dimensional nanostructure electrolyte additive, preparation method and application
  • A kind of two-dimensional nanostructure electrolyte additive, preparation method and application
  • A kind of two-dimensional nanostructure electrolyte additive, preparation method and application

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preparation example Construction

[0027]The preparation method of the two-dimensional nanostructure electrolyte additive includes the following steps:

[0028](1) The organic or inactive block material is peeled off into a two-dimensional nanof piece having a thickness of less than 10 nanometers using ball milling, ultrasonic dispersion or chemistry. Wherein, the ball mill is 10 h to 20 h; the ultrasonic dispersed time is 1 h to 10h; the dispersant used for ultrasonic dispersion is water, ethanol, isopropanol, N, N-dimethylformamide, N- One or more of methylpyrrolidone.

[0029](2) The two-dimensional nano sheet was added to the deionized water and dispersed uniform, obtained a two-dimensional nano-sperm dispersion, and then dissipated the two-dimensional nanoconographic dispersion to obtain a two-dimensional nano-structural electrolyte additive. Among them, a two-dimensional nano-melen dispersion solution is also required to perform vacuum filtration before the two-dimensional nanocarbon dispersion is freeze.

[0030]The pr...

Embodiment 1

[0033]Preparation of additives

[0034]The preparation method of the additive of the present embodiment includes the steps of:

[0035](1) 2 g of hexagonal boron and 120 g of urea were added to a 150 ml of polytetrafluoroethylene ball, and after sealed at room temperature at a 500rpm tension ball milling 24h.

[0036](2) The mixture obtained by step (1) was added to 1 L of deionized water, and the ultrasound was dispersed for 1 h.

[0037](3) The dispersion obtained by step (2) was vacuum filtered and washed twice with deionized water, and the dried dried.

[0038]The additive of the present embodiment is a white powder, and a colloid can be formed in the electrolyte, adding from 0.7% by mass.

[0039]2. Preparation of electrolyte

[0040]By mixing DOL, DME is mixed in volume ratio 1: 1, then add LITFSI and LINO3, Equipped with 1M LITFSI and 2WT% LINO3The electrolyte was dissolved, and the above additive was dissolved, and the mass ratio of 99.3: 0.7 was mixed, and the desired electrolyte was obtained a...

Embodiment 2

[0043]The preparation method of the additive is basically the same as that of Example 1, but is used instead of urea ball milling using sucrose. Further, the additive and the electrolyte were mixed in accordance with 99: 1 mass ratio, and the electrolyte salt was used in 1 m Litfsi and an organic solvent using Dol + DME (1: 1, Vol). Also test lithium metal symmetry batteries, the amount of electrolyte is not used. Test its room temperature cycle performance.

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Abstract

The invention belongs to the technical field of electrolytes for alkali metal batteries, and specifically discloses a two-dimensional nanostructure electrolyte additive, a preparation method and an application. The two-dimensional nanostructure electrolyte additive is a two-dimensional structure organic or inorganic nanosheet, and the two-dimensional nanostructure material is boron nitride nanosheet, graphene oxide, transition metal sulfide nanosheet, two-dimensional metal organic framework material, One or more of two-dimensional covalent organic framework materials, the thickness of which is not greater than 10 nanometers. The method includes peeling organic or inorganic bulk materials into two-dimensional nanosheets with a thickness of less than 10 nanometers, adding them into deionized water to disperse evenly, and freeze-drying to obtain a two-dimensional nanostructure electrolyte additive. The electrolyte includes electrolyte salt, non-aqueous organic solvent, and the above-mentioned two-dimensional nanostructure electrolyte additive. The invention can improve the long-term cycle stability and safety of the battery.

Description

Technical field[0001]The present invention belongs to the technical field of alkali metal battery electrolyte technology, and more particularly to a two-dimensional nano structural electrolyte additive, preparation method and application.Background technique[0002]Lithium-ion batteries are one of the most popular secondary batteries in commercial batteries, but current commercial lithium-ion batteries are close to theoretical energy density, which cannot meet high energy density energy storage requirements such as electric vehicles and grids. Compared to ordinary lithium-ion batteries, the alkali metal cells using alkali metal are extremely high, but the alkali metal reactivity is high, and the electrolytic solution can be continuously reacted, resulting in loss of electrolyte, dendritic growth Short circuit with the battery. Suitable electrolyte additives help reduce the sub-reaction of the alkali metal and passivate their surface to limit the further reaction of the alkali metal ne...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/058H01M10/42B82Y30/00
CPCB82Y30/00H01M10/0567H01M10/058H01M10/4235Y02E60/10Y02P70/50
Inventor 李真吴敬一黄云辉袁利霞
Owner HUAZHONG UNIV OF SCI & TECH
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