Liquid metal (at) rGO nano-droplet room-temperature liquid metal battery positive electrode material and preparation method thereof

A liquid metal battery and liquid metal technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as poor battery performance, and achieve stable cycle performance, excellent rate performance, and low production costs.

Pending Publication Date: 2022-06-07
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims at the problem of poor battery performance due to the agglomeration of positive electrode material droplets, huge volume expansion, rupture of SEI film and hindered ion diffusion in the prior art in liquid metal batteries, and provides a liquid metal @rGO nano-droplet liquid state at room temperature The preparation method of the positive electrode material of the metal battery, the invention mixes liquid metal nano-droplets and graphene oxide in an alcohol system, and realizes in-situ reduction and self-assembly of GO on the surface of liquid metal nano-droplets by means of ultrasonic treatment at room temperature Coating; making the positive electrode material of the battery have high core-shell structural stability, large reversible charge / discharge specific capacity, excellent rate performance and stable cycle performance

Method used

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  • Liquid metal (at) rGO nano-droplet room-temperature liquid metal battery positive electrode material and preparation method thereof
  • Liquid metal (at) rGO nano-droplet room-temperature liquid metal battery positive electrode material and preparation method thereof
  • Liquid metal (at) rGO nano-droplet room-temperature liquid metal battery positive electrode material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Example 1: Liquid Metal Ga 92 Sn 8 The preparation method of @rGO nanodroplet room temperature liquid metal battery cathode material, the specific steps are as follows:

[0037] (1) 3.4g of liquid metal Ga 92 Sn 8 Dispersed in 40 mL of ethanol, and ultrasonically treated with an ultrasonic probe for 1 h at room temperature to obtain liquid metal Ga 92 Sn 8 Suspension, Liquid Metal Ga 92 Sn 8 The suspension was centrifuged at a speed of 2000 rmp / min for 5 minutes, and the upper suspension was taken, and the liquid metal Ga was obtained after vacuum drying at a temperature of 40 ° C for 4 hours. 92 Sn 8 Nanodroplets;

[0038] (2) 80mg liquid metal Ga obtained in step (1) 92 Sn 8 The nanodroplets were dispersed in 1 ml of ethanol and ultrasonically treated for 30 min at room temperature to obtain liquid metal Ga 92 Sn 8 Nanosuspension;

[0039] (3) adding 8mg graphene oxide to ethanol for ultrasonic pre-dispersion for 1h, adding it to the liquid metal nano-sus...

Embodiment 2

[0046] Example 2: Liquid Metal Ga 75.5 In 24.5 The preparation method of @rGO nanodroplet room temperature liquid metal battery cathode material, the specific steps are as follows:

[0047] (1) 6.8g liquid metal Ga 75.5 In 24.5 Disperse in 53 mL of isopropanol, and ultrasonically treat it with an ultrasonic probe for 1.5 h at room temperature to obtain liquid metal Ga 75.5 In 24.5 Suspension, Liquid Metal Ga 75.5 In 24.5 The suspension was centrifuged at 3000 rmp / min for 6 min, the upper suspension was taken, and the liquid metal Ga was obtained after vacuum drying at a temperature of 40 ° C for 5 h. 75.5 In 24.5 Nanodroplets;

[0048] (2) 210mg liquid metal Ga obtained in step (1) 75.5 In 24.5 The nano-droplets were dispersed in 5 ml of isopropanol and ultrasonically treated for 35 min at room temperature to obtain liquid metal Ga 75.5 In 24.5 Nanosuspension;

[0049] (3) 10mg graphene oxide was added to 15mL isopropanol for ultrasonic pre-dispersion for 1.2h, ad...

Embodiment 3

[0053] Example 3: Preparation method of liquid metal Ga@rGO nano-droplets at room temperature liquid metal battery cathode material, the specific steps are as follows:

[0054] (1) Disperse 2.23 g of liquid metal Ga in 4.46 mL of methanol, and ultrasonically treat it with an ultrasonic probe for 2 hours at room temperature to obtain a liquid metal Ga suspension. Liquid metal Ga nano-droplets were obtained after vacuum drying at a temperature of 35 °C for 5 h;

[0055] (2) 20mg liquid metal Ga nano-droplets obtained in step (1) are dispersed in 2ml methanol, and ultrasonically treated for 40min at room temperature to obtain a liquid metal Ga nano-suspension;

[0056] (3) 1.2 mg of graphene oxide was added to 3 mL of methanol for ultrasonic pre-dispersion for 1.5 h, added to the liquid metal nanosuspension obtained in step (2), ultrasonically treated for 1.2 h at room temperature, and centrifuged at 4000 rmp / min for 5 min , take the upper suspension and dry it to obtain liquid ...

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Abstract

The invention relates to a preparation technology of a room-temperature liquid metal battery positive electrode material, in particular to a liquid metal (at) rGO nano-droplet room-temperature liquid metal battery positive electrode material and a preparation method thereof. According to the liquid metal (at) rGO nano-droplet room-temperature liquid metal battery positive electrode material, the liquid metal (at) rGO nano-droplet comprises a liquid nano-metal core and a reduced graphene oxide shell coating the liquid metal core, and the reduced graphene oxide shell is prepared by in-situ reduction and self-assembly coating of GO on the surface of the liquid metal nano-droplet; wherein the liquid metal is gallium or gallium-based alloy, and the melting point is not higher than 200 DEG C. According to the method, liquid metal nano liquid drops and graphene oxide are mixed in an alcohol system, and in-situ reduction and self-assembly coating of GO on the surfaces of the liquid metal nano liquid drops are achieved in an ultrasonic treatment mode at the room temperature. The battery positive electrode material provided by the invention has high core-shell structure stability, large reversible charge / discharge specific capacity, excellent rate capability and stable cycle performance.

Description

technical field [0001] The invention relates to a technology for preparing a positive electrode material for a room temperature liquid metal battery, in particular to a liquid metal@rGO nanodroplet positive electrode material for a room temperature liquid metal battery and a preparation method thereof. Background technique [0002] Gallium-based liquid metals have high specific capacity and good self-healing properties, and are promising cathode materials for realizing room temperature liquid metal batteries (LMBs). However, most liquid metal cathode materials face key challenges, including huge volume expansion, unstable solid electrolyte interface (SEI) layers, hindered ion diffusion, and severe capacity fading. [0003] The bulk liquid metal makes it difficult for anode ions to diffuse throughout the active material. The use of liquid metal nanodroplets can shorten the ion diffusion path and improve the diffusion speed of negative ions. However, during the charge / discha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/587
CPCH01M4/38H01M4/366H01M4/587Y02E60/10
Inventor 王恺钊胡劲陈天友王玉天王开军张维钧
Owner KUNMING UNIV OF SCI & TECH
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