High-temperature high-voltage non-aqueous electrolyte and lithium ion battery containing non-aqueous electrolyte

A non-aqueous electrolyte, high-voltage technology, applied in secondary batteries, circuits, electrical components, etc., can solve problems such as battery charge-discharge cycle performance degradation, poor battery high-temperature storage performance, and poor electrolyte matching. Achieve the effect of improving high temperature cycle performance, improving high and low temperature performance, improving cycle performance and high temperature storage performance

Active Publication Date: 2019-05-28
SHANSHAN ADVANCED MATERIALS QUZHOU CO LTD
View PDF8 Cites 20 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after the working voltage of the ternary power battery is increased, the performance of the battery such as charge and discharge cycles is reduced.
The reason may be: on the one hand, the positive electrode material is not stable enough under high voltage, on the other hand, the matching between the electrolyte and the material is not good, and the ordinary electrolyte will be oxidized and decomposed under high voltage conditions, resulting in high-temperature storage of the battery. Poor performance, poor high temperature cycle performance, poor low temperature discharge performance and poor safety
[0004] Chinese invention patent application (publication number CN103579676A) proposes to use fluorinated solvents (FEC, TFPC, etc.) On the graphite negative electrode, the thickness of the SEI film will increase, which will affect the charge and discharge performance. At the same time, the moisture brought in during the test will also make the LiPF 6 Decompose to generate HF, so that the thickness of SEI film increases continuously, and gas production occurs

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
  • High-temperature high-voltage non-aqueous electrolyte and lithium ion battery containing non-aqueous electrolyte
  • High-temperature high-voltage non-aqueous electrolyte and lithium ion battery containing non-aqueous electrolyte
  • High-temperature high-voltage non-aqueous electrolyte and lithium ion battery containing non-aqueous electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] In a glove box filled with argon, with an oxygen content of ≤1ppm and a water content of ≤1ppm, uniformly mix ethylene carbonate, ethyl methyl carbonate, and diethyl carbonate at a mass ratio of 1:1:1, and pour into the mixture Add 0.1% of the total mass of the electrolyte 1-(trimethylsilyl) imidazole (TMSI) and 1% of the total mass of the electrolyte vinyl sulfate (DTD), 0.5% of the total mass of the electrolyte 1,3-propenesulfone Acid lactone (PST), and then respectively add lithium hexafluorophosphate (LiPF 6 ) and lithium bisfluorosulfonimide (LiFSI) with 1% of the total mass of the electrolyte, lithium difluorooxalate borate (LiDFOB) with 1% of the total mass of the electrolyte, and stirred to completely dissolve it to obtain the electrolyte of Example 1.

[0032] Inject the prepared electrolyte solution into a soft-packed lithium-ion battery with NCM622 as the positive electrode material and graphite negative electrode as the negative electrode. After the liquid i...

Embodiment 2

[0034] In a glove box filled with argon, with an oxygen content of ≤1ppm and a water content of ≤1ppm, uniformly mix ethylene carbonate, ethyl methyl carbonate, and diethyl carbonate at a mass ratio of 1:1:1, and pour into the mixture Add TMSI with 0.2% total mass of electrolyte, DTD with 1% total mass of electrolyte, PST with 0.5% total mass of electrolyte, and then add LiPF with 12.5% ​​total mass of electrolyte to the mixed solution respectively 6 LiFSI with 1% of the total mass of the electrolyte and LiDFOB with 1% of the total mass of the electrolyte were stirred to dissolve completely, except that, the same operation as in Example 1 was performed to prepare a lithium-ion battery.

Embodiment 3

[0036] In a glove box filled with argon, with an oxygen content of ≤1ppm and a water content of ≤1ppm, uniformly mix ethylene carbonate, ethyl methyl carbonate, and diethyl carbonate at a mass ratio of 1:1:1, and pour into the mixture Add TMSI with 0.5% of the total mass of the electrolyte, DTD with 1% of the total mass of the electrolyte, and PST with 0.5% of the total mass of the electrolyte, and then add LiPF with a total mass of 12.5% ​​of the total electrolyte to the mixed solution 6 LiFSI with 1% of the total mass of the electrolyte and LiDFOB with 1% of the total mass of the electrolyte were stirred to dissolve completely, except that, the same operation as in Example 1 was performed to prepare a lithium-ion battery.

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 relates to the technical field of lithium ion batteries, in particular to a high-temperature high-voltage non-aqueous electrolyte and a lithium ion battery containing the non-aqueous electrolyte. The high-temperature high-voltage non-aqueous electrolyte comprises a lithium salt, a non-aqueous solvent and an additive, wherein the additive comprises a first borate additive, a second nitrogen-containing lithium salt additive, a third silicon-nitrogen-based additive and a fourth sulfonate and sulfate mixed additive. According to the present invention, after the various additives areproperly proportioned, the advantages of the additives can be provided, the disadvantages of the additives can be mutually inhibited, the high-temperature storage performance of the battery is improved through the synergistic effect of the additives, the high-temperature cycle performance of the battery is improved, and the application prospect is good under the conditions of high temperature andhigh voltage.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a high-temperature, high-voltage non-aqueous electrolytic solution and a lithium-ion battery containing the non-aqueous electrolytic solution. Background technique [0002] In lithium-ion batteries, high-voltage ternary cathode materials are widely used in portable electronic devices such as mobile phones, notebook computers, electric vehicles, and large energy storage devices due to their high energy density, environmental friendliness, and long cycle life. The energy density requirements of batteries are getting higher and higher, making it difficult for commercial ternary cathode material lithium-ion batteries (working voltage 4.2V) to meet the requirements. [0003] At present, studies have shown that one of the effective ways to increase the energy density of ternary electrode materials is to increase the working voltage of the battery, which is the trend of ba...

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 Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCY02E60/10
Inventor 郭洁朱学全大浦靖何建辉
Owner SHANSHAN ADVANCED MATERIALS QUZHOU CO LTD
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