Mononuclear magnesium cationization salt, its preparation method and application

A technology of magnesium cations and salts, applied in the direction of magnesium organic compounds, electrochemical generators, 2/12 group organic compounds without C-metal bonds, etc., can solve the problem of inability to achieve reversible deposition and dissolution, narrow chemical window and high activity Inability to use rechargeable magnesium batteries and other problems, to overcome the cumbersome synthesis method, high magnesium reversible deposition-dissolution efficiency, and overcome the effects of reversible deposition and dissolution

Active Publication Date: 2019-03-08
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0005] Extensive experiments have demonstrated that, compared with the simple lithium-ion salt (LiClO) commonly used in commercial lithium-ion batteries, 4 , LiPF 6 , Li(CF 3 SO 3 ) 2 etc.) differently, in simple mononuclear magnesium cationization salts (such as MgCl 2 , Mg(ClO 4 ) 2 , Mg(CF 3 SO 3 ) 2 etc.) in the aprotic polar solvent electrolyte is easy to form a dense passivation film that does not conduct magnesium ions, so that magnesium ions cannot be reversibly deposited and dissolved (Journal of Electroanalytical Chemistry, 1999, 466 (2): 203-217 ), so cannot be used in rechargeable magnesium batteries
Although studies have found that magnesium can be reversibly deposited and dissolved in ether solutions of Grignard reagents, common Grignard reagents cannot be directly used as electrolytes for rechargeable magnesium batteries due to their narrow electrochemical window and high activity.
Subsequently, ether solutions of organoboron-magnesium salts and organoaluminum-magnesium salts were also found to achieve reversible magnesium deposition and dissolution, making rechargeable magnesium batteries a big step towards practical use, but the cation part of such electrolyte salts is usually dinuclear magnesium Cations are relatively large in size, which is not conducive to ion conduction; and the anion part contains organic groups, which has poor electrochemical stability; in addition, their preparation process is relatively complicated and the cost is relatively high

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  • Mononuclear magnesium cationization salt, its preparation method and application
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  • Mononuclear magnesium cationization salt, its preparation method and application

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Embodiment 1

[0038] Embodiment 1: 56mg anhydrous magnesium chloride (MgCl 2 ) and 158mg of anhydrous aluminum chloride (AlCl 3 ) in 1 mL of ionic liquid 1-butyl-1-methylpyrrolidinium bis(trifluoromethanesulfonyl)imide (n-methyl-(n-butyl)pyrrolidinium bis(trifluoromethanesulfonyl)imide, PYR14TFSI) at 95°C React for 24 hours to obtain a light yellow solution, cool to room temperature, and add 1mL THF to obtain a 0.3M rechargeable magnesium electrolyte. The crystal structure indicates that the electrolyte salt is [Mg(THF) 6 ][AlCl 4 ] 2 , whose crystal structure is as figure 1 shown. Elemental analysis theoretical value is C 36.28, H 6.09; measured value is C 36.27%, N 6.10%. Raman spectrum test result 350cm -1 anion AlCl 4 - Raman peaks of other aluminum chloride anions are not seen.

Embodiment 2

[0039] Embodiment 2: 56mg anhydrous magnesium chloride (MgCl 2 ) and 158mg of anhydrous aluminum chloride (AlCl 3 ) was reacted in 1mL triethylene glycol dimethyl ether (TEGDME) at 30°C for 24 hours to obtain a light yellow solution, cooled to room temperature to obtain a 0.6M rechargeable magnesium electrolyte, and the crystal structure indicated that the electrolyte salt was [Mg(TEGDME) 2 ][AlCl 4 ] 2 . Elemental analysis theoretical value is C 22.87, H4.48; measured value is C, 22.89%; N 4.47%. Raman spectrum test result 350cm -1 anion AlCl 4 - Raman peaks of other aluminum chloride anions were not seen.

Embodiment 3

[0040] Embodiment 3: 56mg anhydrous magnesium chloride (MgCl 2 ) and 158mg of anhydrous aluminum chloride (AlCl 3 ) in 1 mL of toluene at 100°C for 24 hours to obtain a light yellow solution, which was cooled to room temperature to obtain a 0.6M rechargeable magnesium electrolyte. The crystal structure of the electrolyte salt is [Mg(toluene) 6 ][AlCl 4 ] 2 . Elemental analysis theoretical value is C 55.15, H 5.29; measured value is C, 55.10%; H 5.30%. Raman spectrum test result 350cm -1 anion AlCl 4 - Raman peaks of other aluminum chloride anions were not seen.

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Abstract

The invention discloses a mononuclear magnesium cationization salt, its preparation method and application. The chemical formula of the mononuclear magnesium cationization salt is MgR n MX 4‑m Y m , where R is a non-aqueous solvent molecule, M includes Al 3+ and / or B 3+ , X and Y include halide ions or halide-like ions, n is selected from any integer from 0 to 6, and m is selected from any integer from 0 to 4. The mononuclear magnesium cationization salt provided by the invention has simple structure, excellent electrochemical properties, and its preparation method is a low-cost one-step synthesis process, the raw materials are easy to obtain, the preparation process is simple, and it is easy to produce on a large scale. When applied to the electrolyte of rechargeable magnesium batteries, the formed electrolyte has high ionic conductivity, high magnesium reversible deposition-dissolution efficiency, excellent cycle performance and high anodic oxidation decomposition potential. When applied to magnesium batteries, its initial discharge capacity can reach more than 700mAh / g, and it can be cycled for more than 20 cycles.

Description

technical field [0001] The invention specifically relates to a mononuclear magnesium cationization salt, its preparation method and application, and belongs to the field of electrochemical energy. Background technique [0002] Facing the requirements of efficient, clean, economical and safe energy systems in the new stage of the 21st century, the development of new green, high-performance, large-scale energy storage technologies and the efficient use of new energy have become a global concern and an inevitable trend of development. Lithium-ion battery energy storage system, as an effective energy storage method, has attracted the attention and attention of energy departments and energy companies in various countries, and occupies a core position in the field of energy storage industry today. However, the global lithium resource reserves are limited and the spatial distribution is uneven (mainly in South America), which not only results in high cost of raw materials for lithi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07F3/02H01M10/0568H01M10/054
CPCC07F3/003H01M10/054H01M10/0568Y02E60/10
Inventor 张跃钢李宛飞
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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