Electrolyte additive for lithium secondary battery, non-aqueous electrolyte comprising electrolyte additive, and lithium secondary battery

一种非水电解液、锂二次电池的技术，应用在电解液添加剂,锂二次电池领域，能够解决增加气体、不均匀SEI膜、低温输出特性难以得到提高等问题，达到分解防止的效果

Active Publication Date: 2015-08-05
LG ENERGY SOLUTION LTD
View PDF5 Cites 20 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In the prior art, in the case of an electrolyte that does not contain electrolyte additives, or contains electrolyte additives with inferior characteristics, it is difficult to improve low-temperature output characteristics due to the formation of an uneven SEI film
Moreover, in the case where electrolyte additives are included, if the addition amount cannot be adjusted to a desired amount, the above-mentioned strong SEI film cannot be formed on the negative electrode, and thus the negative electrode reacts with the electrolyte solution as a side reaction and the negative electrode Swelling phenomenon of swelling, or there is a problem that the generation of gas is increased due to the decomposition of the electrolyte, thereby reducing the charge and discharge efficiency

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
  • Electrolyte additive for lithium secondary battery, non-aqueous electrolyte comprising electrolyte additive, and lithium secondary battery
  • Electrolyte additive for lithium secondary battery, non-aqueous electrolyte comprising electrolyte additive, and lithium secondary battery
  • Electrolyte additive for lithium secondary battery, non-aqueous electrolyte comprising electrolyte additive, and lithium secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] [Preparation of Electrolyte Solution]

[0045] With ethylene carbonate (EC): propylene carbonate (PC): ethyl methyl carbonate (EMC): dimethyl carbonate (DMC) = 1.32: 1.20: 4.08: 4.28 (parts by weight) combined non- Aqueous organic solvent, and 0.5M LiPF 6 and 0.5M LiFSI were mixed, and with respect to 100 parts by weight of the non-aqueous electrolyte, 1% by weight of lithium difluorooxalate phosphate (LiDFOP), 0.2% by weight of (trimethylsilyl) propane Phosphate-based phosphoric acid ester (TMSPa), 1 wt% of 1,3-propene sultone (PRS), and 1 wt% of vinyl sulfate (ESa), thereby preparing an electrolyte solution.

[0046] [Manufacture of lithium secondary battery]

[0047] 92% by weight LiCoO as the positive electrode active material 2 , 4% by weight of carbon black as a conductive agent, 4% by weight of polyvinylidene fluoride (PVdF) as a binder were added to N-methyl-2-pyrrolidone (NMP) as a solvent, thereby preparing positive electrode mixture slurry. The positive ...

experiment example

[0055]

[0056] The secondary batteries manufactured in Example 1 and Comparative Examples 1 to 2 were stored at 60°C for up to 12 weeks, and the 1st week, 2nd week, 3rd week, 4th week, 8th week, 12th week The secondary battery was charged and discharged at 23° C. and 5 C for 10 seconds, respectively, and the output of the secondary battery was calculated using the voltage difference generated in this case. Based on the initial output (W, week 0), the output of the secondary battery corresponding to each week after high-temperature storage is calculated as a percentage (corresponding week output (W) / initial output (W)*100(% )), and put its result in figure 1 shown in . Experiments were performed at a state of charge (SOC) of 50%.

[0057] From figure 1 As can be seen from the above, the secondary battery of Example 1 is excellent in output characteristics even after high-temperature storage at 60°C. In particular, it was confirmed that in the case of the secondary batter...

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 present invention provides a non-aqueous electrolyte comprising: a non-aqueous organic solvent; an imide-based lithium salt; and, as an electrolyte additive, at least one additive selected from the group consisting of lithium difluorooxalate phosphate (LiDFOP), trimethylsilylpropyl phosphate (TMSPa), 1,3-propenesultone (PRS), and ethylene sulfate (Esa). The electrolyte additive for a lithium secondary battery of the present invention can suppress the PF6- decomposition of a positive electrode surface, which may occur at the time of high-temperature cycle operation of a lithium secondary battery, and prevent an oxidation reaction of an electrolyte, thereby improving output characteristics at high and low temperatures and suppressing a swelling phenomenon.

Description

technical field [0001] The invention relates to an electrolyte solution additive containing four compounds, a nonaqueous electrolyte solution containing the electrolyte solution additive and a lithium secondary battery containing the electrolyte solution additive. Background technique [0002] With the technological development and increase in demand for mobile devices, the demand for secondary batteries as energy sources has increased dramatically. Among these secondary batteries, lithium secondary batteries having high energy density and high voltage have been commercialized and widely used. [0003] Lithium metal oxide is used as a cathode active material of a lithium secondary battery, and lithium metal, lithium alloy, crystalline carbon or amorphous carbon, or a carbon composite material is used as an anode active material. The active material is applied to a current collector with an appropriate thickness and length, or the active material itself is applied as a thin ...

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): H01M10/0567H01M10/0568H01M4/583H01M10/052
CPCH01M10/052H01M10/0567H01M10/0568H01M10/0569H01M2300/0025Y02E60/10H01M4/587
Inventor 金广渊李哲行梁斗景林永敏金宝基安俞贺朴秦贤
Owner LG ENERGY SOLUTION 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