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Electrolyte additive based on glycerol carbonate compounds and lithium ion battery

An electrolyte additive, glycerol carbonate technology, applied in the field of lithium batteries, can solve problems such as stability decline, achieve the effects of improving stability and uniformity, promoting rapid film formation, and improving battery performance

Inactive Publication Date: 2015-10-28
TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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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 additive based on glycerol carbonate compounds and lithium ion battery
  • Electrolyte additive based on glycerol carbonate compounds and lithium ion battery
  • Electrolyte additive based on glycerol carbonate compounds and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Electrolyte preparation:

[0039] (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.

[0040] (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.

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

[0042] How to make the negative half-cell:

[0043] The mesophase carbon 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 treatm...

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 put forward for lithium-ion batteries in terms of battery life and fast charging. [0003] Due to the high-density current, the oxidation performance of the positive electrode material increases and the stability decreases, so the current commercial organic electrolyte is prone to electrochemical reactions on the surface of the positive electrode, and then decomposes to generate gas. At the same time, the transition metal elements (such as cobalt, nickel, etc.) in the positive electrode material also undergo a reduction reacti...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567H01M2300/0025Y02E60/10
Inventor 刘靖梁山孙冬兰
Owner TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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