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High-safety electrolyte, and preparation method and application of electrolyte

A high-safety, electrolyte-based technology, applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, circuits, etc., can solve problems such as unsatisfactory cycle efficiency and cycle life, unstable electrolyte, and poor cycle performance, and achieve low Effects of viscosity, interfacial film stabilization, and freezing point depression

Inactive Publication Date: 2019-06-11
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are problems of poor cycle performance and short life. The very important reason is that the electrolyte is unstable, which leads to interface instability and makes the Coulombic efficiency low and unstable. Currently, high-concentration electrolytes are used to alleviate this problem, but the cycle efficiency and The cycle life is not ideal, so it is very important and meaningful to find a stable electrolyte to make the lithium metal battery have a long cycle life and high Coulombic efficiency

Method used

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  • High-safety electrolyte, and preparation method and application of electrolyte
  • High-safety electrolyte, and preparation method and application of electrolyte
  • High-safety electrolyte, and preparation method and application of electrolyte

Examples

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Effect test

Embodiment 1

[0033] Prepare a high-voltage electrolyte, the solvent is N-methyl-N-butylpyrrolidine bisfluorosulfonimide salt (PYR14-FSI) and C with a molar ratio of 1:0.05 4 h 6 f4 O, the solute is lithium bisfluorosulfonyl imide (LiFSI), and the solute concentration is 0.01moL / L.

Embodiment 2

[0035] Prepare a high-voltage electrolyte, and the solvent is N-methyl-N-propylpiperidine bis(trifluoromethylsulfonyl)imide salt (P1A3-TFSI) and C with a molar ratio of 1:0.2 5 h 4 f 8 O, the solute is lithium bis(trifluoromethylsulfonyl)imide (LiTFSI), and the solute concentration is 0.2moL / L.

Embodiment 3

[0037] Prepare a high-voltage electrolyte, and the solvent is N-methyl-N-butylimidazole bis(fluorosulfonyl)imide salt (BMIM-FSI) and C with a molar ratio of 1:1 6 h 4 f 10 O, the solute is lithium bisfluorosulfonimide (LiFSI), and the concentration of the solute is 0.8moL / L.

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Abstract

The invention discloses a high-safety electrolyte, and a preparation method and an application of the electrolyte. The electrolyte utilizes the electronegativity and the low polarity of a fluorine atom in fluoroalkyl ether, so that a freezing point of a mixed solvent consisting of ionic liquid and the fluoroalkyl ether is reduced; the lightning is increased; the oxidation resistance is improved; and the wettability to an electrode is also improved to some extent. A low-viscosity and stable electrolytic solution can be easily obtained on the premise that the high oxidability of the existing electrolyte is not lost. An interfacial film formed by an electrolyte system is high in ionic conductivity and stable, has a relatively wide electrochemical window, and has very high safety.

Description

【Technical field】 [0001] The invention belongs to the field of lithium-ion batteries, and in particular relates to a high-safety electrolyte and a preparation method and application thereof. 【Background technique】 [0002] Compared with other batteries, lithium-ion batteries are favored by various industries due to their high specific energy, small size, no maintenance, and environmental friendliness. However, current electronic products have higher and higher requirements on the energy density of batteries, making the current commercial lithium-ion batteries It is difficult for batteries to meet the requirements, so the use of high-voltage, high-capacity positive electrode materials is the general trend, and the oxidation and decomposition of ordinary lithium-ion battery electrolytes under high voltage limit the development of high-voltage lithium-ion batteries. From the current public reports of domestic and foreign research progress From the point of view, in the developm...

Claims

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Application Information

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IPC IPC(8): H01M10/0569H01M10/0525H01M10/058
CPCY02E60/10Y02P70/50
Inventor 宋江选雷文雅熊仕昭
Owner XI AN JIAOTONG UNIV
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