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Magnesium ion battery negative electrode material, magnesium ion battery and preparation method thereof

A magnesium ion battery and negative electrode material technology, applied in battery electrodes, electrolyte storage battery manufacturing, secondary batteries, etc., can solve the problems of complex preparation methods, high cost, hindering the deposition and dissolution of magnesium ions, and achieve low cost, lower potential, The effect of excellent electrochemical cycle stability and rate performance

Active Publication Date: 2020-06-05
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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Problems solved by technology

Artificially prepared graphene is based on the limitations of various preparation methods, and there are inevitably various structural defects, which affect the physical and chemical properties of graphene, but high-quality graphene often has complicated preparation methods, low yield and high cost.
[0005] In the electrolyte method, commonly used Mg(TFSI) 2 , Mg(PF 6 ) 2 , Mg(HMDS) 2 Such organic electrolyte systems will decompose on the surface of magnesium metal, hindering the deposition and dissolution of magnesium ions. In order to solve such problems, it is proposed to use inorganic electrolyte MgCl in magnesium ion batteries. 2 -AlCl 3 , but due to the electrode potential of Al (Al (vs.SHE) =-1.66V) compared to the reduction electrode potential of Mg (Mg (vs.SHE) =-2.37V) is relatively high, so Al will co-deposit with Mg during magnesium deposition, which will affect the overall electrochemical performance of the battery

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  • Magnesium ion battery negative electrode material, magnesium ion battery and preparation method thereof
  • Magnesium ion battery negative electrode material, magnesium ion battery and preparation method thereof
  • Magnesium ion battery negative electrode material, magnesium ion battery and preparation method thereof

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preparation example Construction

[0041] The embodiment of the present invention firstly provides a negative electrode material for a magnesium ion battery, the negative electrode material for a magnesium ion battery is a defect-rich reduced graphene oxide obtained by reducing graphene oxide with a reducing agent hydrazine hydrate; Defect-containing refers to the intensity ratio (I D / I G ) is in the range of 1 to 1.5. Its preparation method comprises the following steps:

[0042] S11, adopting improved Hummers method to prepare graphene oxide;

[0043] S12. Prepare the prepared graphene oxide into a solution with a concentration of 0.2 mg / mL-0.6 mg / mL, add hydrazine hydrate, stir and mix, and then reduce at a temperature of 80°C-100°C for 20min-1h to prepare reduced graphite oxide ene, and the reduced graphene oxide is used as a negative electrode material for a magnesium ion battery.

[0044] In step S12, the mass ratio of the graphene oxide to the hydrazine hydrate is preferably 10:8˜10:10.

[0045] An...

Embodiment 1

[0054] Embodiment 1: the preparation of negative electrode material and negative electrode

[0055] (1) Firstly, graphene oxide (GO) was prepared by the modified Hummers method.

[0056] (2) Then, the prepared graphene oxide (GO) was formulated into a 0.5 mg / mL solution, added with hydrazine hydrate, stirred and mixed, and then reduced at high temperature.

[0057] (3) After the reduction reaction is completed, it is filtered and washed with deionized water until neutral, and dried in an oven to obtain highly active and defect-rich reduced graphene oxide (rGO).

[0058] (4) Dissolving the reduced graphene oxide in absolute ethanol to obtain a dispersion, adding the dispersion to the current collector and drying it to prepare a negative electrode.

[0059] In this example, three kinds of reduced graphene oxide samples rGO-1, rGO-2 and rGO-3 were prepared by adjusting the mass ratio of hydrazine hydrate and graphene oxide added in the above step (2) and the reduction reaction t...

Embodiment 2

[0068] Embodiment 2: the preparation of electrolyte

[0069] (1), 19mg of magnesium chloride (MgCl 2 ) and 78mg yttrium trichloride (YCl 3 ) into 0.8 mL of N-butylpyridine bistrifluoromethanesulfonic acid ionic liquid, heated and stirred at 160° C. for 24 h, and then cooled to room temperature to form the first solution.

[0070] (2), add 1.5mL diethylene glycol dimethyl ether to coordinate with magnesium ions in the first solution, prepare and obtain based on MgCl 2 -YCl 3 The electrolyte of the solution, hereinafter denoted as MgCl 2 -YCl 3 electrolyte.

[0071] As a comparison, this embodiment also prepared electrolytes commonly used in other two magnesium-ion batteries:

[0072] The first one: 0.533g aluminum trichloride (AlCl 3 ) was slowly added into 6mL of tetrahydrofuran (THF), stirred until dissolved, then 4mL of benzyl magnesium chloride solution (2M PhMgCl in THF) was slowly added dropwise to the above solution, and stirred at room temperature for 24h to prep...

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Abstract

The invention discloses a magnesium ion battery negative electrode material. The magnesium ion battery negative electrode material is defect-rich reduced graphene oxide obtained by reducing graphene oxide through hydrazine hydrate serving as a reducing agent. The invention also discloses a magnesium ion battery and a preparation method thereof, and the magnesium ion battery comprises a positive electrode, a negative electrode, a diaphragm and an electrolyte, wherein the negative electrode comprises a current collector and reduced graphene oxide attached to the current collector, and the electrolyte is MgCl<2>-YCl<3> electrolyte. In the magnesium ion battery provided by the invention, YCl<3> is used as an electrolyte additive to replace common AlCl<3>, so that the problem of co-deposition of Al<3+> and Mg<2+> can be avoided, and the potential of a polarized electrode is reduced; and on the other hand, the reduced graphene oxide is adopted as a negative electrode material, the reduced graphene oxide rich in defects can adsorb more magnesium ions and has good matching performance with the MgCl<2>-YCl<3>-based electrolyte, and the magnesium ion battery formed by matching and assemblingthe reduced graphene oxide and the MgCl<2>-YCl<3>-based electrolyte has excellent electrochemical cycling stability and rate capability.

Description

technical field [0001] The invention belongs to the technical field of secondary batteries, and in particular relates to a magnesium ion battery negative electrode material and a preparation method thereof, and also relates to a magnesium ion battery and a preparation method thereof. Background technique [0002] As the global fossil resources are scarce year by year and the environmental pollution caused by their use is increasing, people's demand for green energy is increasing. Electrochemical energy storage systems, especially rechargeable batteries, are becoming increasingly important. As we all know, lithium-ion batteries (LIBs) have been widely used in portable electronic products and electric vehicles. However, challenges such as shortage, uneven distribution, and high cost of lithium raw material resources limit the large-scale sustainable application of LIBs. [0003] Rechargeable magnesium-ion batteries have low cost, safe operation and theoretical volumetric cap...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583H01M10/054H01M10/0568H01M10/058
CPCH01M4/583H01M10/0568H01M10/054H01M10/058Y02E60/10Y02P70/50
Inventor 张跃钢王敏胥燕王健
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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