Additive with dual lithium dendrite inhibition effect and application of additive

An inhibitory, lithium dendrite technology, applied in sustainable manufacturing/processing, final product manufacturing, electrolyte battery manufacturing, etc., to achieve long-lasting effects, improved lithium ion deposition, and high reliability

Inactive Publication Date: 2016-12-21
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 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 ions from Dendrites are deposited on the electrode surface, which greatly improves the safety of lithium secondary batteries

Method used

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  • Additive with dual lithium dendrite inhibition effect and application of additive
  • Additive with dual lithium dendrite inhibition effect and application of additive
  • Additive with dual lithium dendrite inhibition effect and application of additive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1) Electrolyte configuration

[0032] The first step is to accurately weigh 1.177g lithium hexafluorophosphate (LiPF 6 ), dissolved in 8.823g propylene carbonate (PC) solution to prepare 1M LiPF 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).

[0033] 2) Electrolyte and separator wettability test

[0034] Electrolyte surface tension test: Use a surface tension meter to test the surface tension of the electrolyte

[0035] 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 ce...

Embodiment 2

[0048] Electrolyte configuration

[0049] 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.

[0050] All the other steps are similar to Example 1.

Embodiment 3

[0052] Electrolyte configuration

[0053] 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.

[0054] All the other steps are similar to Example 1.

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Abstract

The invention discloses an additive with a dual lithium dendrite inhibition effect and an application of the additive, an electrolyte containing the additive, a battery and a preparation method of the battery. The additive is a typical non-ionic surfactant and the mass fraction of the additive in the electrolyte is 0.05%-5%. Through a simple method of adding an organic additive to the electrolyte, formation of lithium dendrites on the surface of an electrode is inhibited from two aspects as follows: (1) the wettability of the electrolyte and a membrane is improved by reducing the surface tension of the electrolyte and transmission channels of lithium ions in the membrane are increased, so that lithium ion flow is uniformly distributed on the surface of the electrode to finally achieve the target of inhibiting formation of the lithium dendrites; and (2) deposition sites of the lithium ions on the surface of the electrode are further improved through adsorption of the additive on the surface of the electrode, thereby inhibiting formation of the lithium dendrites. The safety and the cycle performance of a lithium secondary battery are greatly improved by adding the additive to the electrolyte.

Description

technical field [0001] 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 [0002] 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, safe and stable energy storage device must be used to store these energy sources and then release them smoothly. The problem of urban environmental pollution is becoming more and more prominent, most of which come from the exhaust emissions of fuel vehicles. The emergen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/058H01M10/0525
CPCH01M10/0525H01M10/0567H01M10/4235Y02E60/10Y02P70/50
Inventor 项宏发谢勇梁栋栋
Owner HEFEI UNIV OF TECH
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