Electrolyte additive, electrolyte and application in magnesium metal secondary battery

An electrolyte additive and secondary battery technology, applied in secondary batteries, circuits, electrical components, etc., can solve problems such as hindering the penetration of Mg2+, limiting the optional range of magnesium electrolyte components, and uneven growth of magnesium metal. Achieve the effect of facilitating industrialization promotion and application, improving interface compatibility, and high production efficiency

Pending Publication Date: 2022-08-05
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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AI-Extracted Technical Summary

Problems solved by technology

However, recently, Banerjee et al. and Pint et al. have reported the uneven growth behavior of magnesium metal during the electrodeposition process, proving that magnesium metal anodes also have potential safety hazards of dendrite growth (Mater.Horiz., 2020, 7(3 ):843-854; Joule, 2020, 4(6):1324-1336)
In addition, the early studies on the magnesium electrolyte system all believed that once a passivation layer is formed on the surface of the magnesium metal...
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Method used

As can be seen from Fig. 5 and 6, the battery performance in the electrolytic solution provided by embodiment 1 is all better than the electrolytic solution of comparative example 1 in aspects such as discharge specific capacity, discharge voltage platform and charge-discharge reversibi...
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Abstract

The invention belongs to the technical field of batteries, and particularly relates to a functional electrolyte additive containing inorganic chloride, an electrolyte and application of the functional electrolyte additive in a magnesium metal secondary battery. The electrolyte additive is one or more of inorganic chlorides AClx shown in the specification, A is an element in IIIA, IVA or VA main groups, and the value of x is between 2 and 4. According to the invention, an in-situ chemical reaction between one or more specific inorganic metal chlorides in the electrolyte and magnesium metal is utilized to form a compact and stable protective solid electrolyte interface film (SEI film) on the surface of the magnesium metal negative electrode, so that further reaction between an additive, magnesium salt and the magnesium metal negative electrode is slowed down; and the interface compatibility between the electrolyte and the magnesium metal negative electrode is improved, so that the cycle performance of the magnesium metal secondary battery is greatly improved.

Application Domain

Secondary cellsOrganic electrolytes

Technology Topic

Electrical batteryMetal chloride +6

Image

  • Electrolyte additive, electrolyte and application in magnesium metal secondary battery
  • Electrolyte additive, electrolyte and application in magnesium metal secondary battery
  • Electrolyte additive, electrolyte and application in magnesium metal secondary battery

Examples

  • Experimental program(3)
  • Comparison scheme(1)
  • Effect test(1)

Example Embodiment

[0028] Example 1
[0029] Magnesium electrolyte, which comprises magnesium salt, organic solvent and electrolyte additive, wherein, the magnesium salt is magnesium bis-trifluoromethylsulfonimide and magnesium chloride, and the concentrations are respectively 0.25mol/L and 0.5mol/L; the solvent is ethyl acetate Glycol dimethyl ether; the electrolyte additive is bismuth trichloride, and the weight percentage in the electrolyte is 1%wt.

Example Embodiment

[0030] Example 2
[0031] Magnesium electrolyte, which comprises magnesium salt, organic solvent and electrolyte additive, wherein, the magnesium salt is magnesium bis-trifluoromethylsulfonimide and magnesium chloride, and the concentrations are respectively 0.25mol/L and 0.5mol/L; the solvent is ethyl acetate Glycol dimethyl ether; the electrolyte additive is tin tetrachloride, and the weight percentage in the electrolyte is 1%wt.

Example Embodiment

[0032] Example 3
[0033] Magnesium electrolyte, which comprises magnesium salt, organic solvent and electrolyte additive, wherein, the magnesium salt is magnesium bis-trifluoromethylsulfonimide and magnesium chloride, and the concentrations are respectively 0.25mol/L and 0.5mol/L; the solvent is ethyl acetate Glycol dimethyl ether; the electrolyte additive is aluminum trichloride, and the weight percentage in the electrolyte is 1%wt.

PUM

PropertyMeasurementUnit
Thickness100.0µm

Description & Claims & Application Information

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