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Lithium battery electrolyte as well as preparation method and application thereof

An electrolyte and lithium battery technology, applied in the field of electrochemistry, can solve problems such as high self-discharge rate, battery passivation, overgrowth, etc., and achieve high thermal stability, strong flame resistance, and low cost

Pending Publication Date: 2020-08-28
犀望新能源科技(昆山)有限公司
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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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  • Lithium battery electrolyte as well as preparation method and application thereof
  • Lithium battery electrolyte as well as preparation method and application thereof
  • Lithium battery electrolyte as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Raw material composition (parts by weight): 5 parts of lithium salt, 1 part of ethylene glycol dibutyl ether, 30 parts of methyl-nonafluorobutyl ether, 2 parts of high and low temperature resistant additives, and 10 parts of imidazole-based ionic liquid.

[0046] Lithium salt is LiBF 4 And bis(oxalate) lithium borate, the mass ratio is 1:1.

[0047] The high and low temperature resistant additives are dihydropyridine, azone and fluoroethylene carbonate, the mass ratio is 1:0.5:3.

[0048] The structural formula of imidazolium-based ionic liquid is:

[0049] The preparation method of lithium battery electrolyte comprises the following steps:

[0050] S1. Use high-purity aluminum sheets for the positive and negative electrodes in an anhydrous environment, turn on the regulated power supply for electrolysis for 10 hours, and the voltage is 3V, and remove the water in the imidazolium-based ionic liquid and methyl-nonafluorobutyl ether;

[0051] S2. dissolving the lithi...

Embodiment 2

[0055] Raw material composition (parts by weight): 12 parts of lithium salt, 3 parts of ethylene glycol dibutyl ether, 50 parts of octafluoropentyl allyl ether, 5 parts of high and low temperature resistant additive, and 15 parts of imidazole-based ionic liquid.

[0056] Lithium salt is LiBF 4 And bis(oxalate)lithium borate, the mass ratio is 1:2.

[0057] The high and low temperature resistant additives are dihydropyridine, azone and fluoroethylene carbonate, and the mass ratio is 1:2:7.

[0058] The structural formula of imidazolium-based ionic liquid is:

[0059] The preparation method of lithium battery electrolyte comprises the following steps:

[0060] S1. Use high-purity aluminum sheets for the positive and negative electrodes in an anhydrous environment, turn on the regulated power supply and electrolyze for 15 hours at a voltage of 6V, and remove the water in the imidazolium-based ionic liquid and octafluoropentyl allyl ether;

[0061] S2. dissolving the lithium ...

Embodiment 3

[0065] Composition of raw materials (parts by weight): 6 parts of lithium salt, 2 parts of ethylene glycol dibutyl ether, 35 parts of sevoflurane, 3 parts of high and low temperature resistant additives, and 11 parts of imidazole-based ionic liquid.

[0066] Lithium salt is LiBF 4 And bis(oxalate)lithium borate, the mass ratio is 1:1.2.

[0067] The high and low temperature resistant additives are dihydropyridine, azone and fluoroethylene carbonate, the mass ratio is 1:0.7:4.

[0068] The structural formula of imidazolium-based ionic liquid is:

[0069] The preparation method of lithium battery electrolyte comprises the following steps:

[0070] S1. Use high-purity aluminum sheets for the positive and negative electrodes in an anhydrous environment, turn on the regulated power supply for electrolysis for 11 hours, and the voltage is 4V, and remove the water in the imidazolium-based ionic liquid and sevoflurane;

[0071] S2. dissolving the lithium salt in the imidazolium-b...

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Abstract

The invention provides a lithium battery electrolyte, which is characterized by comprising a lithium salt, ethylene glycol dibutyl ether, a fluorine-containing organic solvent, a high and low temperature resistant additive and imidazolyl ionic liquid. The lithium battery electrolyte prepared by the invention can form a relatively stable passivation film, and the layer of passivation film is inhibited along with the prolonging of the storage time, so that the storage performance of the lithium battery is remarkably improved, and the storage life of the lithium battery is remarkably prolonged. Meanwhile, the electrolyte has a relatively low freezing point and high-temperature incombustibility, the electrolyte is endowed with very strong flame resistance at the same time, the quick charging performance of the battery can also be enhanced, and the electrolyte can be widely applied to quick-charging lithium batteries.

Description

technical field [0001] The invention relates to the technical field of electrochemistry, in particular to a lithium battery electrolyte and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries have witnessed the flourishing of modern electronic technology, becoming an essential part of modern ubiquitous portable electronic devices. Lithium electrochemical cells, more commonly known as batteries (packs), are used in a wide variety of military and civilian products. Many of these products use high-energy and high-power batteries. Due in part to the miniaturization of portable electronic devices, it is desirable to develop smaller lithium batteries with increased power capacity and service life [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 afte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0566H01M10/0567H01M10/0568H01M10/0569H01M10/0525H01M10/42
CPCH01M10/0566H01M10/0567H01M10/0568H01M10/0569H01M10/0525H01M10/4235H01M2300/0025Y02E60/10
Inventor 袁峰
Owner 犀望新能源科技(昆山)有限公司
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