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Electrolyte for lithium battery and lithium battery using the same

A lithium battery and electrolyte technology, applied in primary batteries, lithium storage batteries, secondary batteries, etc., can solve problems such as excessive growth, high self-discharge rate, and battery passivation

Active Publication Date: 2018-07-06
EVE ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in some cases, such as after long-term storage at room temperature and high temperature storage, the passivation film tends to overgrow, resulting in severe passivation and high self-discharge rate of the battery, causing battery failure

Method used

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  • Electrolyte for lithium battery and lithium battery using the same
  • Electrolyte for lithium battery and lithium battery using the same
  • Electrolyte for lithium battery and lithium battery using the same

Examples

Experimental program
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Effect test

Embodiment 1

[0031] An embodiment of the electrolyte solution for lithium batteries of the present invention, the electrolyte solution described in this embodiment is used for lithium / thionyl chloride batteries, the electrolyte solution contains a conventional electrolyte solution and a pyridine ionic liquid, and the pyridine ionic liquid contains Cation and anion, the cation is N-butylpyridine, the anion is aluminum tetrachloride ion, and the conventional electrolyte is LiAlCl with a concentration of 1.5M 4 -SOCl 2 Lithium / thionyl chloride conventional electrolyte, the volume percentage of pyridine ionic liquid in the electrolyte is 1%. The electrolyte solution of this embodiment is prepared by the following method:

[0032] (1) Pre-electrolysis: Use high-purity aluminum sheets for the positive and negative electrodes in an anhydrous environment, connect to a regulated power supply with a voltage of 1.08V, and perform electrolysis for 24 hours to remove the moisture in the pyridine-based...

Embodiment 2

[0035] An embodiment of the electrolyte solution for lithium batteries of the present invention, the electrolyte solution described in this embodiment is used for lithium / thionyl chloride batteries, the electrolyte solution contains a conventional electrolyte solution and a pyridine ionic liquid, and the pyridine ionic liquid contains Cation and anion, the cation is N-n-butylpyridine, the anion is tetrachlorogallate ion, and the conventional electrolyte is LiAlCl with a concentration of 1.5M 4 -SOCl 2 Lithium / thionyl chloride conventional electrolyte, the volume percentage of pyridine ionic liquid in the electrolyte is 5%. The preparation method of the electrolyte solution of this embodiment is the same as that of Embodiment 1.

Embodiment 3

[0037] An embodiment of the electrolyte solution for lithium batteries of the present invention, the electrolyte solution described in this embodiment is used for lithium / thionyl chloride batteries, the electrolyte solution contains a conventional electrolyte solution and a pyridine ionic liquid, and the pyridine ionic liquid contains Cation and anion, the cation is N-picoline, the anion is bis(trifluoromethylsulfonyl)imide anion, and the conventional electrolyte is LiAlCl with a concentration of 1.5M 4 -SOCl 2 Lithium / thionyl chloride conventional electrolyte, the volume percentage of pyridine ionic liquid in the electrolyte is 10%. The preparation method of the electrolyte solution of this embodiment is the same as that of Embodiment 1.

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Abstract

Disclosed is an electrolyte for a lithium battery. The electrolyte contains a pyridinium ionic liquid, and the pyridinium ionic liquid contains cations and anions, wherein the cations are N-alkyl pyridines; and the anions are one of terachloroaluminate ions, tetrachlorogallate ions, tetrafluoroborate anions, hexafluorophosphate anions, bis(trifluoromethylsulfonyl)imide anions, lactate anions, p-toluene sulfonate anions, acetyl sulfonimide anions, saccharin anions, amino acid anions, sulphate anions, diisooctyl sulfosuccinate anions, 4,5-dinitroimidazole anions and 5-nitrotetrazole anions. The electrolyte of the present invention can effectively suppress the growth of a passivation layer (an SEI film) on the lithium metal surface in a lithium battery, thereby significantly improving the storage performance of the battery. Additionally, also disclosed are a preparation method for the electrolyte and a lithium battery containing the electrolyte.

Description

technical field [0001] The invention relates to an electrolyte solution for a lithium battery and a lithium battery containing the electrolyte solution, in particular to an electrolyte solution for a lithium / thionyl chloride battery or a lithium / manganese dioxide battery or a lithium / carbon fluoride battery And a lithium battery using the electrolyte. Background technique [0002] Lithium batteries are widely used in instrumentation, memory power supply, military, oil drilling and other fields due to their high energy, low self-discharge rate, long storage life and environmental protection. [0003] In a lithium battery, after metal lithium contacts with the electrolyte, a passivation layer (SEI film) will be formed on the surface of the lithium metal. discharge rate and long storage life. However, in some cases, such as after long-term storage at room temperature and high temperature storage, the passivation film tends to overgrow, resulting in severe passivation and high...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M6/16
CPCH01M6/168H01M2300/0017H01M10/052H01M10/0569H01M2300/0045Y02E60/10
Inventor 曹浪袁中直刘金成
Owner EVE ENERGY CO LTD
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