Electrolyte and lithium secondary battery comprising same

A lithium secondary battery and electrolyte technology, applied in secondary batteries, secondary battery repair/maintenance, circuits, etc., to achieve improved lithium ion deposition, long-lasting effects, and high reliability

Active Publication Date: 2019-11-12
安徽圣格能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the deficiencies of the prior art, to provide an additive with double lithium dendrite inhibition and its application to solve the problem of lithium dendrite formation and growth in lithium batteries. The present invention can effectively prevent lithium secondary Dendrites are deposited on the surface of the electrode, thereby greatly improving the safety of lithium secondary batteries

Method used

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  • Electrolyte and lithium secondary battery comprising same
  • Electrolyte and lithium secondary battery comprising same
  • Electrolyte and lithium secondary battery comprising same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 1) Electrolyte configuration

[0037] The first step is to accurately weigh 1.177g lithium hexafluorophosphate (LiPF 6 ), dissolved in 8.823g propylene carbonate (PC)

[0038] 1M LiPF in solution 6 / PC electrolyte; the second step, accurately weigh 0.01g additive HO-CH 2 -CH 2 -(O-CH 2 -CH 2 ) 98 -(O-CH(CH 3 )-CH 2 ) 67 -(O-CH 2 -CH 2 ) 98 -CH 2 -CH 2 -OH, dissolved in 4.99g 1M LiPF 6 / PC, an electrolyte with an additive mass fraction of 0.2% was obtained. Stand for three days for later use. The above steps are all completed in a glove box (both water and oxygen content are less than 0.1ppm).

[0039] 2) Electrolyte and separator wettability test

[0040] Electrolyte surface tension test: Use a surface tension meter to test the surface tension of the electrolyte

[0041] Diaphragm liquid absorption test: first step, make polyethylene (PE) diaphragm into a small disc with a diameter of 16mm; second step, take a small amount of electrolyte in 1) with a ...

Embodiment 2

[0054] Electrolyte configuration

[0055] The first step is to accurately weigh 1.177g lithium hexafluorophosphate (LiPF 6 ) was dissolved in 8.823g propylene carbonate (PC) to prepare 1M LiPF 6 / PC electrolyte; in the second step, accurately weigh 0.025g additive HO-CH in the glove box 2 -CH 2 -(O-CH 2 -CH 2 ) 98 -(O-CH(CH 3)-CH 2 ) 67 -(O-CH 2 -CH 2 ) 98 -CH 2 -CH 2 -OH, dissolved in 4.975g 1M LiPF 6 / PC, an electrolyte with an additive mass fraction of 0.5% was obtained. Stand for three days for later use.

[0056] All the other steps are similar to Example 1.

Embodiment 3

[0058] Electrolyte configuration

[0059] The first step is to accurately weigh 1.177g lithium hexafluorophosphate (LiPF 6 ) was dissolved in 8.823g propylene carbonate (PC) to prepare 1M LiPF 6 / PC electrolyte; the second step, accurately weigh 0.05g additive HO-CH with a balance in the glove box 2 -CH 2 -(O-CH 2 -CH 2 ) 98 -(O-CH(CH 3 )-CH 2 ) 67 -(O-CH 2 -CH 2 ) 98 -CH 2 -CH 2 -OH, dissolved in 4.95g 1M LiPF 6 / PC, the electrolyte solution with additive mass fraction of 1% was obtained. Stand for three days for later use.

[0060] All the other steps are similar to Example 1.

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Abstract

The invention provides an electrolyte for a lithium secondary battery and the lithium secondary battery comprising the electrolyte. The electrolyte comprises an additive, a lithium and an organic solvent, wherein the chemical general formula of the additive is ABA or AB, A is a hydrophilic functional group and is selected from one of polyethylene oxide HO-(CH2-CH2-O)n-H or polyhydric alcohol CnH2<n+2>-x(OH)x, x is more than or equal to 3, B is a hydrophobic functional group and is selected from one of polypropylene oxide, alkylphenol, straight chain hydrocarbon or branch chain hydrocarbon, andthe mass percent of the additive in the electrolyte accounts for 0.05-5% on the basis of total mass of the electrolyte.

Description

[0001] This application is a divisional application of an invention patent application with an application date of August 9, 2016, an application number of 201610649434.3, and an invention titled "An additive with double lithium dendrite effect and its application". technical field [0002] The invention belongs to the technical field of batteries, and in particular relates to an organic additive for the electrolyte of a lithium secondary battery with double lithium dendrite inhibition and its application in the preparation of the electrolyte. Background technique [0003] Energy crisis and environmental pollution are two major problems facing society today. Due to the non-renewability of fossil energy, people have to turn their attention to some new renewable energy, such as wind energy, tidal energy, biomass energy and so on. However, due to the instability and intermittent nature of these new energy sources, in order to improve their utilization, a high energy density, sa...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): H01M10/0567H01M10/0525H01M10/42
CPCH01M10/0525H01M10/0567H01M10/4235Y02E60/10Y02P70/50
Inventor项宏发谢勇梁栋栋
Owner安徽圣格能源科技有限公司