Unlock instant, AI-driven research and patent intelligence for your innovation.

A functional additive for electrolyte, long-cycle lithium-ion battery electrolyte and lithium-ion battery

A technology of lithium-ion batteries and functional additives, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of limited cycle life improvement of lithium batteries, increased film-forming resistance on the negative electrode surface, and limited role of film-forming additives, etc., to reduce Impedance, reduce internal resistance, improve the effect of stability

Active Publication Date: 2019-04-23
CHINA AVIATION LITHIUM BATTERY LUOYANG
View PDF3 Cites 2 Cited by
  • 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 additives to the electrolyte to improve the stability of the SEI film on the surface of the negative electrode, in order to improve the cycle life of lithium-ion batteries; but usually a single film-forming additive has limited effects , and will greatly increase the film-forming resistance on the surface of the negative electrode, which will limit the improvement of the cycle life of the lithium battery

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A functional additive for electrolyte, long-cycle lithium-ion battery electrolyte and lithium-ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0027] The long-cycle lithium-ion battery electrolyte of the present embodiment is composed of lithium salt, organic solvent and the above-mentioned functional additive; the lithium salt is lithium hexafluorophosphate, and the concentration in the electrolyte is 1mol / L; each group of the functional additive Components and their mass percentages in the electrolyte (based on the total mass of the electrolyte) are: vinylene carbonate 2%, lithium bisoxalate borate 0.5%, lithium bisfluorosulfonyl imide (LiFSI) 0.1%, Vinyl sulfate 0.5%, butyl sultone 1%; The organic solvent is a mixture of cyclic carbonate and chain carbonate in a mass ratio of 3:7, and the cyclic carbonate is ...

Embodiment 2

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

[0031] The long-cycle lithium-ion battery electrolyte of the present embodiment is composed of lithium salt, organic solvent and the above-mentioned functional additive; the lithium salt is lithium hexafluorophosphate, and the concentration in the electrolyte is 1mol / L; each group of the functional additive The components and their mass percentages in the electrolyte (based on the total mass of the electrolyte) are: vinylene carbonate 2.5%, lithium bisoxalate borate 0.5%, lithium bisfluorosulfonyl imide (LiFSI) 0.5%, Vinyl sulfate 0.5%, butyl sultone 1%; The organic solvent is a mixture of cyclic carbonate and chain carbonate in a mass ratio of 3:7, and the cyclic carbo...

Embodiment 3

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

[0035] The long-cycle lithium-ion battery electrolyte of the present embodiment is composed of lithium salt, organic solvent and the above-mentioned functional additive; the lithium salt is lithium hexafluorophosphate, and the concentration in the electrolyte is 1mol / L; each group of the functional additive Components and their mass percentages in the electrolyte (based on the total mass of the electrolyte) are: vinylene carbonate 2%, lithium bisoxalate borate 0.5%, lithium bisfluorosulfonyl imide (LiFSI) 0.1%, Vinyl sulfate 1%, butyl sultone 1.5%; The organic solvent is a mixture of cyclic carbonate and chain carbonate in a mass ratio of 3:7, and the cyclic carbonate is ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
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