Electrolyte solution additive and lithium-ion battery based on glycerol carbonate compounds

An electrolyte additive, glycerol carbonate technology, applied in the application of lithium battery electrolyte additives, glycerol carbonate compounds, can solve problems such as decreased stability, improve stability and uniformity, promote rapid film formation, The effect of improving battery performance

Inactive Publication Date: 2017-05-03
TIANJIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to overcome the shortcoming that the stability of the electrolyte drops under high-density current in the prior art, and to provide a kind of electrolyte additive based on glycerol carbonate compounds, and the electrolyte using the additive can make the lithium-ion battery operate at high Good cycle performance and high capacity retention under current conditions

Method used

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  • Electrolyte solution additive and lithium-ion battery based on glycerol carbonate compounds
  • Electrolyte solution additive and lithium-ion battery based on glycerol carbonate compounds
  • Electrolyte solution additive and lithium-ion battery based on glycerol carbonate compounds

Examples

Experimental program
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Effect test

Embodiment 1

[0038] Preparation of electrolyte:

[0039] (1) The organic solvent is prepared into a mixed solvent according to the volume ratio of 50 parts of ethylene carbonate and 50 parts of dimethyl carbonate, and molecular sieves are used, and calcium hydride removes water to make its moisture lower than 10ppm.

[0040] (2) The conductive lithium salt LiPF 6 Dissolved in the mixed solvent obtained in step (1), stirred evenly, and made into a common electrolyte, wherein the conductive lithium salt LiPF 6 The final concentration in common electrolyte is 1.0mol / L.

[0041] (3) adding a tris (glycerol carbonate) borate additive whose mass is 0.5% of the total mass of lithium salt and organic solvent to the common electrolyte prepared in step (2).

[0042] How to make a negative half cell:

[0043] The mesocarbon microsphere material, polyvinylidene fluoride (PVDF), and conductive graphite were weighed according to the mass ratio of 90:5:5, and put into a vacuum drying oven for drying t...

Embodiment 2

[0049] Electrolyte preparation:

[0050] (1) The organic solvent is formulated into a mixed solvent according to the volume ratio of 50 parts of ethylene carbonate and 50 parts of dimethyl carbonate. Molecular sieves and calcium hydride are used to remove water to make the moisture lower than 10 ppm.

[0051] (2) The conductive lithium salt LiPF 6 Dissolve in the mixed solvent obtained in step (1), stir evenly, and make common electrolyte solution, wherein conductive lithium salt LiPF 6 The final concentration in common electrolyte is 1.0mol / L.

[0052] (3) Add tris(glycerol carbonate) borate additive whose mass is 1.0% of the total mass of lithium salt and organic solvent to the ordinary electrolyte prepared in step (2).

[0053] The production and testing of the battery are the same as in Example 1.

Embodiment 3

[0055] (1) The organic solvent is formulated into a mixed solvent according to the volume ratio of 50 parts of ethylene carbonate and 50 parts of dimethyl carbonate. Molecular sieves and calcium hydride are used to remove water to make the moisture lower than 10 ppm.

[0056] (2) The conductive lithium salt LiPF 6 Dissolve in the mixed solvent obtained in step (1), stir evenly, and make common electrolyte solution, wherein conductive lithium salt LiPF 6 The final concentration in common electrolyte is 1.0mol / L.

[0057] (3) Add a tris(glycerol carbonate) borate additive whose mass is 2% of the total mass of the lithium salt and the organic solvent to the ordinary electrolyte prepared in step (2).

[0058] The production and testing of the battery are the same as in Example 1.

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Abstract

The invention provides an electrolyte additive based on glycerol carbonate compounds and a lithium ion battery. An electrolyte using the additive enables the lithium ion battery to still have good cycle performance and high capacity retention ratio under high current. The electrolyte additive based on the glycerol carbonate compounds comprises a compound having a molecular structure shown in the specification, wherein n is an integer and is larger than 1 and smaller than 5, and R1 is one of a group with the carbon number being 1-10, straight-chain alkylene, a straight-chain group containing oxygen and / or halogen, boron atoms, a group containing aromatic hydrocarbons, alkylene containing saturated branched chains and a group containing oxygen and / or halogen elements and saturated branched chains.

Description

technical field [0001] The invention belongs to the field of lithium batteries, and in particular relates to the application of a glycerol carbonate compound as an electrolyte additive for lithium batteries. Background technique [0002] In recent years, with the continuous popularization and rapid development of mobile communications, mobile office electronic products and technologies, and transportation energy batteries, higher requirements have been placed on the endurance and fast charging of lithium-ion batteries. [0003] Due to the increased oxidation performance and decreased stability of the cathode material under high-density current, the current commercial organic electrolytes are prone to electrochemical reactions on the surface of the cathode, and then decompose to generate gas. At the same time, transition metal elements (such as cobalt, nickel, etc.) in the positive electrode material also undergo a reduction reaction and precipitate, which leads to the deteri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567H01M2300/0025Y02E60/10
Inventor 刘靖梁山孙冬兰
Owner TIANJIN UNIV OF SCI & TECH
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