Functional additive for electrolyte, long-circulation electrolyte of lithium ion battery and lithium ion battery

A technology for lithium ion batteries and functional additives, which is applied in secondary batteries, circuits, electrical components, etc., can solve the problems of limited improvement of lithium battery cycle life, increase of negative electrode surface film formation resistance, limited effect of film formation additives, etc. The effect of resistance, reducing internal resistance and improving stability

Active Publication Date: 2016-11-16
CHINA AVIATION LITHIUM BATTERY LUOYANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As the number of battery cycles increases, the SEI film on the surface of the negative electrode is destroyed, the electrolyte is continuously decomposed, and the graphite negative electrode is continuously damaged, resulting in a continuous decline in battery cycle performance.
In order to improve the cycle life of lithium-ion batteries, it is usually considered to add special film-forming additiv

Method used

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  • Functional additive for electrolyte, long-circulation electrolyte of lithium ion battery and lithium ion battery

Examples

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Example Embodiment

[0025] Example 1

[0026] The functional additive for electrolyte of this embodiment is composed of the following components by weight: 2 parts by weight of vinylene carbonate, 0.5 part by lithium bisoxalate borate, 0.1 part by lithium bisfluorosulfonimide (LiFSI), 0.5 part by vinyl sulfate Parts, 1 part of butyl sultone.

[0027] The long-cycle lithium ion battery electrolyte of this embodiment is composed of a lithium salt, an organic solvent and the above-mentioned functional additives; the lithium salt is lithium hexafluorophosphate, and the concentration in the electrolyte is 1 mol / L; each group of the functional additives And its mass percentage in the electrolyte (based on the total mass of the electrolyte): vinylene carbonate 2%, lithium bisoxalate borate 0.5%, lithium bisfluorosulfonimide (LiFSI) 0.1%, 0.5% of vinyl sulfate and 1% of butyl sultone; the organic solvent is a mixture of cyclic carbonate and chain carbonate in a mass ratio of 3:7, and the cyclic carbonate is ...

Example Embodiment

[0029] Example 2

[0030] The functional additive for electrolyte of this embodiment is composed of the following components by weight: 2.5 parts of vinylene carbonate, 0.5 parts of lithium bisoxalate borate, 0.5 parts of lithium bisfluorosulfonimide (LiFSI), 0.5 parts of vinyl sulfate Parts, 1 part of butyl sultone.

[0031] The long-cycle lithium ion battery electrolyte of this embodiment is composed of a lithium salt, an organic solvent and the above-mentioned functional additives; the lithium salt is lithium hexafluorophosphate, and the concentration in the electrolyte is 1 mol / L; each group of the functional additives And its mass percentage in the electrolyte (based on the total mass of the electrolyte): vinylene carbonate 2.5%, lithium bisoxalate borate 0.5%, lithium bisfluorosulfonimide (LiFSI) 0.5%, 0.5% of vinyl sulfate and 1% of butyl sultone; the organic solvent is a mixture of cyclic carbonate and chain carbonate in a mass ratio of 3:7, and the cyclic carbonate is eth...

Example Embodiment

[0033] Example 3

[0034] The functional additive for the electrolyte of this embodiment is composed of the following components by weight: 2 parts by weight of vinylene carbonate, 0.5 part by lithium bisoxalate borate, 0.1 part by lithium bisfluorosulfonimide (LiFSI), and 1 part by weight of vinyl sulfate. Parts, 1.5 parts of butyl sultone.

[0035] The long-cycle lithium ion battery electrolyte of this embodiment is composed of a lithium salt, an organic solvent and the above-mentioned functional additives; the lithium salt is lithium hexafluorophosphate, and the concentration in the electrolyte is 1 mol / L; each group of the functional additives And its mass percentage in the electrolyte (based on the total mass of the electrolyte): vinylene carbonate 2%, lithium bisoxalate borate 0.5%, lithium bisfluorosulfonimide (LiFSI) 0.1%, 1% of vinyl sulfate and 1.5% of butyl sultone; the organic solvent is a mixture of cyclic carbonate and chain carbonate in a mass ratio of 3:7, and the ...

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Abstract

The invention discloses a functional additive for an electrolyte, a long-circulation electrolyte of a lithium ion battery and the lithium ion battery. The functional additive comprises the following constituents by weight part: 0.5-2.5 parts of vinylene carbonate, 0.5-2 parts of lithium bisoxalatoborate, 0.1-2 parts of lithium bisimide, 0.5-2 parts of ethylene sulfate and 0.5-2 parts of butane sultone. The functional additive for the electrolyte, disclosed by the invention, is formed by combining the vinylene carbonate, the lithium bisoxalatoborate, the lithium bisimide (LiFSI), the ethylene sulfate and butane sultone. When the functional additive is added to the electrolyte for use, the stability of an SEI membrane on a surface of a negative electrode is improved, the internal resistance of the SEI membrane is reduced, the SEI membrane is prevented from being damaged during the circulation process to further cause reaction of the electrolyte and the negative electrode, and thus, the cycle lifetime of the battery is prolonged.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, specifically relates to a functional additive for electrolyte, and also relates to a long-cycle lithium ion battery electrolyte and lithium ion battery using the functional additive. Background technique [0002] Lithium-ion battery, as a new type of green high-energy battery, has attracted much attention in the fields of energy chemistry and material chemistry; it has gradually become the mainstream choice for vehicle power batteries due to its high energy and power density, no memory effect, and low self-discharge. one. The electrolyte is an important part of the lithium-ion battery. It not only transports and conducts current between the positive and negative electrodes, but also determines the working mechanism of the battery to a large extent, affecting the specific energy, safety performance, rate charge and discharge performance, and cycle of the battery. Lifespan and produc...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01M10/0567
CPCH01M10/0525H01M10/0567Y02E60/10
Inventor 支岩辉仝俊利潘芳芳余琦向德波王玲
Owner CHINA AVIATION LITHIUM BATTERY LUOYANG
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