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Gamma-LiAlO2 and gamma-Al2O3 composite nanosheet and application of thereof in preparation of alkali metal ion electrolyte

A technology of nanosheets and electrolytes, which is applied in the application field of γ-LiAlO2 and γ-Al2O3 composite nanosheets and the preparation of alkali metal ion electrolytes, which can solve the problems of short cycle life, low energy density of alkali metal ion batteries, and ion conductivity. and the number of migrations is not high

Active Publication Date: 2020-10-27
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The invention solves the technical problem that the ion conductivity and transfer number of the electrolyte material are not high in the prior art, resulting in the low energy density and short cycle life of the alkali metal ion battery. The invention provides a γ-LiAlO 2 with γ-Al 2 o 3 Composite nano sheet filler and its preparation method and application of preparing alkali metal ion electrolyte, the composite polymer electrolyte prepared by using this filler and polymer matrix, electrolyte salt, non-aqueous organic solvent has high room temperature conductivity and migration number, room temperature conductivity The rate can reach ~10 -3 S / cm, and lithium ion migration number ~ 0.91, is an ideal alkali metal ion electrolyte

Method used

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  • Gamma-LiAlO2 and gamma-Al2O3 composite nanosheet and application of thereof in preparation of alkali metal ion electrolyte
  • Gamma-LiAlO2 and gamma-Al2O3 composite nanosheet and application of thereof in preparation of alkali metal ion electrolyte
  • Gamma-LiAlO2 and gamma-Al2O3 composite nanosheet and application of thereof in preparation of alkali metal ion electrolyte

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preparation example Construction

[0043] The preparation method of composite polymer electrolyte in the present invention specifically comprises:

[0044] (1) γ-LiAlO 2 / γ-Al 2 o 3 Preparation of nanosheet fillers

[0045] First, stir 30min in a mixed solution of 0.5g sodium dodecylsulfonate, 5mmol urea, 5mmol aluminum isopropoxide and ethylene glycol / ethanol to form a solution; then transfer the above solution to a 100mL reactor, Reaction at 110°C for 12h. After the reaction is completed and the reactor is cooled to room temperature, the product is cleaned by centrifugal washing, and the cleaning solution is ethanol. Wash and dry to get a fluffy white powder, the white powder is amorphous Al 2 o 3 Nanosheets.

[0046] Weigh 3g white powder and disperse it in 20mL ethanol, add 0.15g Li 2 CO 3 After mixing evenly, dry at 70°C, and anneal the dried powder at 700°C for 3 hours to obtain γ-LiAlO 2 / γ-Al 2 o 3 Nanosheets.

[0047] (2) γ-LiAlO 2 / γ-Al 2 o 3 Preparation of nanosheet / vinylidene fluorid...

Embodiment 1

[0055] Preparation of γ-LiAlO 2 / γ-Al 2 o 3 Nanosheet: PVDF-HFP=2wt% composite polymer electrolyte film, the specific steps are as follows:

[0056] First, stir 30min in a mixed solution of 0.5g sodium dodecylsulfonate, 5mmol urea, 5mmol aluminum isopropoxide and ethylene glycol / ethanol to form a solution; then transfer the above solution to a 100mL reactor, Reaction at 110°C for 12h. The product is centrifuged, washed and dried to obtain a fluffy white powder. The TEM and XRD of the product show that it is amorphous Al 2 o 3 nanosheets, such as figure 1 and figure 2 shown.

[0057] Weigh 3g white powder and disperse it in 20mL ethanol, add 0.15g Li 2 CO 3 After mixing evenly, dry at 70°C. The dried powder is annealed at 700°C for 3 hours to obtain the product. XRD, TEM and SEM of the product show that it is γ-LiAlO with uniform morphology 2 / γ-Al 2 o 3 Porous nanosheets, such as image 3 and Figure 4 shown. Its specific surface area is 121m 2 / g.

Embodiment 2

[0059] Preparation of γ-LiAlO 2 / γ-Al 2 o 3 Nanosheet: PVDF-HFP=2wt% composite polymer electrolyte film, the specific steps are as follows:

[0060] Fully dissolve 0.6g PVDF-HFP in 8mL acetone and stir at 60°C, then add 0.012g of γ-LiAlO prepared in Example 1 2 / γ-Al 2 o 3 Nanosheets, continuously stirred for 3h and ultrasonicated for 15min so that the nanosheets can be uniformly dispersed in the solution.

[0061] γ-LiAlO 2 / γ-Al 2 o 3 The PVDF-HFP solution in which the nanosheets were uniformly dispersed was poured on the glass slide substrate. After the acetone solvent in the solution was volatilized, the obtained film was heated at 60°C for 24 hours under vacuum, and the residual solvent was continuously removed to obtain 2% γ-LiAlO 2 / γ-Al 2 o 3 Nanosheet / PVDF-HFP composite polymer film labeled 2% LAO-PVDF.

[0062]After fully drying the polymer film in the composition of 1M LiPF 6 / EC:DMC:EMC(1:1:1by v / v / v) / 1% VC electrolyte soaked for 12 hours, so that the c...

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Abstract

The invention discloses a gamma-LiAlO2 and gamma-Al2O3 composite nanosheet as well as a preparation method and application thereof in preparation of an alkali metal ion electrolyte, and belongs to thetechnical field of alkali metal ion batteries. The preparation method of the gamma-LiAlO2 and gamma-Al2O3 composite nanosheet filler comprises the steps of dissolving an aluminum source and a surfactant into an organic solvent; performing hydrothermal reaction, centrifuging, washing and drying to obtain the amorphous Al2O3 nanosheet, fully and uniformly mixing the amorphous Al2O3 nanosheet with alithium salt, and performing annealing treatment to obtain the gamma-LiAlO2 and gamma-Al2O3 composite nanosheet filler. The composite polymer electrolyte disclosed by the invention is prepared from the gamma-LiAlO2 and gamma-Al2O3 composite nanosheet filler, a polymer matrix and an electrolyte. The gamma-LiAlO2 / gamma-Al2O3 nanosheet prepared by the method has a high specific surface area and richsurface functional groups, the prepared composite polymer electrolyte has high room-temperature conductivity and migration number, the room-temperature conductivity can reach 10<-3>S / cm, and the lithium ion migration number is 0.91. The lithium metal battery based on the electrolyte can stably circulate for 1500 circles or above under 2C multiplying power, and the capacity of 94.7% is still kept.

Description

technical field [0001] The invention belongs to the technical field of alkali metal ion batteries, and relates to a gamma-LiAlO 2 with γ-Al 2 o 3 Composite nanosheets and their preparation methods and applications for the preparation of alkali metal ion electrolytes, more specifically, a γ-LiAlO 2 with γ-Al 2 o 3 Composite nano sheet filler, composite polymer electrolyte and alkali metal battery, and the application of the composite polymer electrolyte for preparing alkali metal ion electrolyte. Background technique [0002] With the popularity of electric vehicles and mobile portable devices, people have put forward higher requirements for electrochemical energy storage technology. The development of high energy and high power density has become the key to the development of energy storage technology. Alkali metal batteries use alkali metal as the negative electrode and have a very high theoretical capacity. However, due to their active chemical properties, alkali me...

Claims

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Application Information

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IPC IPC(8): H01M10/0565H01M10/0525B82Y40/00
CPCB82Y40/00H01M10/0525H01M10/0565H01M2300/0025Y02E60/10
Inventor 郭新周晓燕李卓
Owner HUAZHONG UNIV OF SCI & TECH
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