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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 enhancing interface stability

Active Publication Date: 2020-03-24
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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  • Two-dimensional nanostructure electrolyte additive, preparation method and application
  • Two-dimensional nanostructure electrolyte additive, preparation method and application
  • 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 comprises the following steps:

[0028] (1) Exfoliate organic or inorganic bulk materials into two-dimensional nanosheets with a thickness of less than 10 nanometers by ball milling, ultrasonic dispersion or chemical methods. Wherein, the time for the ball milling is 10h-20h; the time for the ultrasonic dispersion is 1h-10h; the dispersant used for the ultrasonic dispersion is water, ethanol, isopropanol, N,N-dimethylformamide, N- One or more of methylpyrrolidone.

[0029] (2) adding the two-dimensional nanosheets into deionized water to disperse evenly to obtain a two-dimensional nanosheet dispersion, and freeze-drying the two-dimensional nanosheet dispersion to obtain a two-dimensional nanostructure electrolyte additive. Wherein, before the freeze-drying of the two-dimensional nanosheet dispersion, the two-dimensional nanosheet dispersion needs to be vacuum filtered.

[0030] The presen...

Embodiment 1

[0033] 1. Preparation of Additives

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

[0035] (1) Add 2g of hexagonal boron nitride and 120g of urea into a 150mL polytetrafluoroethylene ball mill jar, seal and ball mill at room temperature at 500rpm for 24h.

[0036] (2) Add the mixture obtained in step (1) into 1 L of deionized water, and ultrasonically disperse for 1 h.

[0037] (3) Vacuum filter the dispersion obtained in step (2), wash twice with deionized water, and freeze-dry to obtain the final product.

[0038] The additive in this embodiment is a white powder, which can form a colloid in the electrolyte, and is added at a mass ratio of 0.7%.

[0039] 2. Electrolyte Preparation

[0040] Mix DOL and DME at a volume ratio of 1:1, then add LiTFSI and LiNO 3 , formulated with 1M LiTFSI and 2wt% LiNO 3 After dissolving, add the above-mentioned additives, mix according to the mass ratio of 99.3:0.7, and stir overnight to obta...

Embodiment 2

[0043] The preparation method of the additive is basically the same as in Example 1, but sucrose is used instead of urea ball milling. In addition, the additive and the electrolyte were mixed in a mass ratio of 99:1, the electrolyte salt was 1M LiTFSI, and the organic solvent was DOL+DME (1:1, vol). The lithium metal symmetric battery was also tested, and the amount of electrolyte was not changed. Test its room temperature cycle performance.

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Abstract

The invention belongs to the technical field of alkali metal battery electrolyte, and particularly discloses a two-dimensional nanostructure electrolyte additive, a preparation method and application.The two-dimensional nanostructure electrolyte additive is a two-dimensional structure organic or inorganic nanosheet, the two-dimensional nanostructure material is one or more of a boron nitride nanosheet, graphene oxide, a transition metal sulfide nanosheet, a two-dimensional metal organic framework material and a two-dimensional covalent organic framework material, and the thickness of the two-dimensional nanostructure material is not greater than 10 nanometers. The method comprises the following steps: stripping an organic or inorganic blocky material into two-dimensional nanosheets with the thickness of less than 10 nanometers, adding the two-dimensional nanosheets into deionized water, uniformly dispersing, and carrying out freeze drying to obtain the two-dimensional nanostructure electrolyte additive. The electrolyte comprises an electrolyte salt, a non-aqueous organic solvent and the two-dimensional nanostructure electrolyte additive. According to the invention, the long-actingcycling stability and safety of the battery can be improved.

Description

technical field [0001] The invention belongs to the technical field of electrolytes for alkali metal batteries, and more specifically relates to a two-dimensional nanostructured electrolyte additive, a preparation method and an application. Background technique [0002] Lithium-ion batteries are one of the most popular secondary batteries in commercial batteries. However, the current commercial lithium-ion batteries are close to the theoretical energy density, which cannot meet the high energy density energy storage needs of electric vehicles and power grids. Compared with ordinary lithium-ion batteries, alkali metal batteries using alkali metal as the negative electrode have extremely high theoretical capacity. However, the alkali metal has a high reactivity and can continuously react with the electrolyte, resulting in the loss of electrolyte and the growth of dendrites. and battery short circuit. Appropriate electrolyte additives help reduce the side reactions of alkali m...

Claims

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Application Information

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Patent Type & Authority Applications(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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