Low-temperature electrolyte and lithium ion battery containing same

A lithium-ion battery and electrolyte technology, applied in secondary batteries, circuits, electrical components, etc., can solve problems such as hindering the low-temperature performance of the battery, increasing the internal resistance of the battery, etc., achieving excellent low-temperature performance and cycle performance, and improving conductivity. efficiency, high ionic conductivity

Pending Publication Date: 2022-05-27
HEFEI GUOXUAN HIGH TECH POWER ENERGY
View PDF1 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The publication number is a patent disclosing an ultra-low temperature electrolyte. By forming a low-impedance SEI film on the surface of the negative electrode, the electrolyte has good compatibility with the positive and negative electrode materials, and realizes the improvement of cy

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
  • Low-temperature electrolyte and lithium ion battery containing same
  • Low-temperature electrolyte and lithium ion battery containing same
  • Low-temperature electrolyte and lithium ion battery containing same

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0033] Example 1

[0034] In an inert atmosphere glove box with both water content and oxygen content below 5 ppm, the organic solvent ethylene carbonate (EC) and ethyl methyl carbonate (EMC) were prepared into an organic solvent in a mass ratio of 1:1. Slowly add lithium hexafluorophosphate to the solvent to dissolve, then add 1% fluoroethylene carbonate and 1% pyrrole-1-sulfonic acid pyrrol-1-yloxyalkanecarboxylic acid anhydride (structural formula shown in formula (2)) ), stirring to make it completely dissolved to obtain a lithium-ion battery electrolyte. The mass fractions of lithium hexafluorophosphate, organic solvent, fluoroethylene carbonate, and pyrrole-1-sulfonic acid pyrrol-1-yloxanecarboxylic acid anhydride (denoted as a) were 13.5%, 84.5%, 1%, and 1%, respectively.

[0035]

[0036] The preparation method of the (pyrrol-1-yloxy) methane acid methyl ester compound is the existing method, and the (pyrrol-1-yloxy) methane acid methyl ester compound in the prior ...

Example Embodiment

[0040] Example 2

[0041] The organic solvents ethylene carbonate (EC), ethyl methyl carbonate (EMC), and dimethyl carbonate (DMC) were mixed in a mass of 1:1:1 in an inert atmosphere glove box with both water and oxygen content below 5 ppm. Than be prepared into an organic solvent, slowly add lithium hexafluorophosphate to the prepared organic solvent to dissolve, then add 1% of the total mass of the electrolyte, fluoroethylene carbonate, 1% of (pyrrol-1-yloxy) formic acid-pyrrole-2 -base ester (the structural formula is shown in formula (3)), which is completely dissolved after stirring to obtain an electrolyte for a lithium ion battery. The mass fractions of lithium hexafluorophosphate, organic solvent, fluoroethylene carbonate, and (pyrrol-1-yloxy)carboxylate-pyrrol-2-yl ester (denoted as b) were 13.5%, 84.5%, 1%, and 1%, respectively.

[0042]

[0043] Compared with Example 1, R in the preparation process of (pyrrol-1-yloxy) formic acid-pyrrol-2-yl ester in this examp...

Example Embodiment

[0045] Example 3

[0046] The organic solvents ethylene carbonate (EC), ethyl methyl carbonate (EMC) and dimethyl carbonate were prepared in a mass ratio of 1:1:1 in an inert atmosphere glove box with water content and oxygen content below 5ppm. organic solvent, slowly add lithium hexafluorophosphate (LiPF 6 ) to dissolve, then add 1% fluoroethylene carbonate and 1% (pyrrol-1-yloxy) trifluoromethyl formate (structural formula is shown in formula (4)) of the total mass of the electrolyte, and after stirring It was completely dissolved to obtain a lithium-ion battery electrolyte. The mass fractions of lithium hexafluorophosphate, organic solvent, fluoroethylene carbonate and trifluoromethyl (pyrrol-1-yloxy)formate (denoted as c) were 13.5%, 84.5%, 1% and 1%, respectively.

[0047]

[0048] Compared with Example 1, in this example (pyrrol-1-yloxy) trifluoromethyl formate preparation process R is -CF 3 .

[0049] Subsequent battery preparation operations were the same as in...

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 low-temperature electrolyte, and relates to the technical field of lithium ion batteries, the low-temperature electrolyte comprises, by mass, 80-85% of an organic solvent, 10-15% of a lithium salt and 0.5-10% of a functional additive; the functional additive is (pyrrole-1-yloxy) methyl methanoate, and the structural formula of the functional additive is shown in the specification. The invention also provides a lithium ion battery containing the low-temperature electrolyte. Compared with the prior art, the method has the beneficial effects that the used functional additive is nitrogen-containing formate and still has relatively high ionic conductivity under the low-temperature condition of-40 DEG C, and oxygen-containing and nitrogen-containing formate can form a stable SEI film on the surface of an electrode material, so that rapid intercalation and deintercalation of lithium ions in the cycle process of the lithium ion battery are guaranteed, and the lithium ion battery has high electrochemical performance. The problem of lithium precipitation of the negative electrode under a low-temperature condition is effectively solved, and the negative electrode shows relatively excellent discharge curve and cycle performance in a low-temperature environment.

Description

technical field [0001] The present invention relates to the technical field of lithium ion batteries, in particular to a low-temperature electrolyte and a lithium ion battery containing the electrolyte. Background technique [0002] Science and technology are the primary productive forces for human development. With the advancement and development of modern science and technology, the thirst for energy is increasing day by day. As a result, problems such as the depletion of petroleum resources, the deterioration of the ecological environment and the general trend of green recycling development have led to the replacement of crude oil energy by new energy sources, which has become an exclusive topic of this century. Develop renewable resources, of which lithium-ion batteries are the primary development target, and electric vehicles will gradually replace fuel vehicles. [0003] Lithium-ion batteries mainly include positive electrode materials, separators, electrolytes and ne...

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): H01M10/0567H01M10/0525
CPCH01M10/0567H01M10/0525Y02E60/10
Inventor 王鹏李国庆梁大宇沈剑马云翔梁伟路
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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