Gel type ionic liquid electrolyte for lithium ion battery as well as preparation method and application thereof

An ionic liquid and electrolyte technology, which is applied in the manufacture of electrolyte batteries, electrolytes, lithium batteries, etc., can solve the problems of aggravating the interface rupture and regeneration of solid electrolytes, and consume electrolytes, so as to inhibit the growth of dendrites, reduce interface impedance, and improve mechanical properties. performance effect

Active Publication Date: 2020-09-11
BEIJING UNIV OF CHEM TECH
View PDF16 Cites 11 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These contact problems can exacerbate the rupture and regeneration of the solid electrolyte interface (SEI) film cau

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
  • Gel type ionic liquid electrolyte for lithium ion battery as well as preparation method and application thereof
  • Gel type ionic liquid electrolyte for lithium ion battery as well as preparation method and application thereof
  • Gel type ionic liquid electrolyte for lithium ion battery as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Under an argon atmosphere, first dissolve 0.14g LiTFSI and 0.09g LiFSI polylithium salt solutes in 0.79g cyclic ether organic solvent DOL in a glass sample bottle, and then add 0.31g of ionic liquid Pyr 14 TFSI, mixed evenly by magnetic stirring; finally add 0.15g of Lewis acid lithium salt initiator LiPF 6 , it was completely dissolved by magnetic stirring, and the Pyr-containing 14 TFSI's trilithium salt gel-type ionic liquid electrolyte precursor solution, after standing for 2 days at room temperature, obtained Pyr-containing 14 TFSI's triple lithium salt gel-type ionic liquid electrolyte. Pyr 14 The structure of TFSI is as follows:

[0059]

[0060] The Pyr 14 In TFSI's triple lithium salt gel-type ionic liquid electrolyte, the content of ionic liquid is 21 wt%, the content of cyclic ether organic solvent is 53.4 wt%, the content of Lewis acid lithium salt initiator is 10.1 wt%, and more The content of lithium salt solute is 15.5wt%.

Embodiment 2

[0062] Under an argon atmosphere, first dissolve 0.17g LiTFSI and 0.11g LiFSI in 0.93 g ethylene glycol diglycidyl ether in a glass sample bottle, and add 0.03 g of SiO with a particle size of 30 nm 2 nanoparticles; then add 0.22g ionic liquid PI 34 FSI, mixed evenly by magnetic stirring; finally, add 0.18g of Lewis acid lithium salt initiator LiBF 4 , dissolved completely by magnetic stirring to obtain 34 The trilithium salt gel-type ionic liquid electrolyte precursor solution of FSI, after standing for 3 days at room temperature, obtained PI-containing 34 FSI's triple lithium salt gel-type ionic liquid electrolyte. P.I. 34 The structure of the FSI is as follows:

[0063]

[0064] The containing PI 34 In FSI's triple lithium salt gel-type ionic liquid electrolyte, the content of ionic liquid is 13.4 wt%, the content of cyclic ether organic solvent is 56.7 wt%, the content of Lewis acid lithium salt initiator is 11 wt%, more The content of the lithium salt solute is 1...

Embodiment 3

[0066] Under an argon atmosphere, first dissolve 0.11g LiTFSI and 0.07g LiFSI in 0.82 g 1,4-butanediol glycidyl ether in a glass vial, and add 0.02 g of SiO with a particle size of 50 nm 2 nanoparticles; then add 0.16g ionic liquid PI 13 FSI, uniformly mixed by magnetic stirring; finally, add 0.25g of Lewis acid lithium salt initiator LiClO 4 , dissolved completely by magnetic stirring to obtain 13 The trilithium salt gel-type ionic liquid electrolyte precursor solution of FSI, after standing for 5 days at room temperature, obtained PI-containing 13 FSI's triple lithium salt gel-type ionic liquid electrolyte. P.I. 13 The structure of the FSI is as follows:

[0067]

[0068] The containing PI 13In FSI's triple lithium salt gel-type ionic liquid electrolyte, the content of ionic liquid is 11.2 wt%, the content of cyclic ether organic solvent is 57.3 wt%, the content of Lewis acid lithium salt initiator is 17.5 wt%, more The content of the lithium salt solute is 12.6wt%,...

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

PropertyMeasurementUnit
Thermal decomposition temperatureaaaaaaaaaa
Particle sizeaaaaaaaaaa
Particle sizeaaaaaaaaaa
Login to view more

Abstract

The invention provides a gel type ionic liquid electrolyte for a lithium ion battery as well as a preparation method and application thereof. The method comprises the following steps: adding a Lewis acid type lithium salt initiator; initiating in-situ ring-opening polymerization of a cyclic ether organic solvent at a low temperature to form a three-dimensional cross-linked network polymer; and limiting the ionic liquid, the lithium salt and the like in a three-dimensional polymer structure by taking the polymer as a skeleton structure. Therefore, the in-situ preparation of the gel-type ionic liquid electrolyte is realized, the sufficient contact between the electrolyte and an electrode material as well as a diaphragm is ensured, the interface impedance can be effectively reduced, a Lewis acid type lithium salt initiator and a multi-lithium salt solute form a multi-lithium salt system, and the improvement of the cycle performance and stability of the gel-type ionic liquid electrolyte isfacilitated; besides, the ionic liquid is introduced, so that the thermal stability and the electrochemical window of the electrolyte are improved while the growth of lithium dendrites is remarkablyinhibited, and the safety performance of the electrolyte is effectively improved.

Description

technical field [0001] The invention relates to a gel-type ionic liquid electrolyte for lithium-ion batteries, a preparation method and application thereof, and belongs to the technical field of lithium-ion batteries. Background technique [0002] The ever-increasing demand for energy has promoted the development of sustainable storage technologies, and electronic devices have become a necessity for people to live and work. Lithium metal has a high theoretical specific capacity (3860mAh g -1 ), low standard reduction potential (-3.04V vs. SHE) and low mass density (0.54g cm -3 ), so the research on secondary batteries using lithium metal as the negative electrode is crucial to meet the energy density and safety requirements of new smart electronic devices for secondary batteries. [0003] Lithium metal dendrites are easily formed during the charging process of traditional liquid electrolyte batteries, which leads to a great decline in the Coulombic efficiency and capacity ...

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
IPC IPC(8): H01M10/0565H01M10/058H01M10/052H01M10/42
CPCH01M10/0565H01M10/058H01M10/052H01M10/4235H01M2300/0085H01M2300/0091Y02E60/10Y02P70/50
Inventor 于乐李念武关俊陈晨
Owner BEIJING UNIV OF CHEM TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap