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Composite flame retardant and electrolyte for enhancing safety of lithium ion battery

A composite flame retardant, lithium-ion battery technology, applied in the direction of secondary batteries, secondary battery repair/maintenance, circuits, etc., can solve the problems of difficult synthesis, influence of lithium-ion battery electrochemical performance, high price, etc., and achieve oxidation potential High, good thermal stability and chemical stability, low cost effect

Pending Publication Date: 2020-08-25
HENAN FAENLAITE NEW ENERGY SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, safe electrolytes include methods such as adding flame retardant additives, high flash point organic solvents or introducing high conductivity, non-flammable ionic liquids into the electrolyte, but the current flame retardants are also harmful to lithium-ion batteries to a certain extent The electrochemical performance has been affected, and there are also problems such as difficult synthesis and high price.

Method used

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  • Composite flame retardant and electrolyte for enhancing safety of lithium ion battery
  • Composite flame retardant and electrolyte for enhancing safety of lithium ion battery
  • Composite flame retardant and electrolyte for enhancing safety of lithium ion battery

Examples

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Embodiment 1

[0032] Embodiment 1 of the present invention provides an electrolyte solution for enhancing the safety of lithium-ion batteries. The electrolyte solution is mainly prepared by mixing the following components in parts by weight: 12 parts of lithium salt, 83 parts of organic solvent, 3 parts of additives and composite resistors. Fuel agent 2 parts.

[0033] Among them, the lithium salt is lithium hexafluorophosphate (LiPF 6 ), its concentration is 1.05mol / L.

[0034] The organic solvent is mainly made by mixing ethyl methyl carbonate (EMC), dimethyl carbonate (DMC) and ethylene carbonate (EC) at a mass ratio of 1:2.5:1.1.

[0035] The additive is mainly made by uniformly mixing vinylene carbonate (VC), fluoroethylene carbonate (FEC) and 1,3-propane sultone (1,3-PS) in a mass ratio of 1:1:1.

[0036] In this example, trifluoromethoxyphosphazene is selected as the composite flame retardant, and its chemical structure is shown in formula II:

[0037]

Embodiment 2

[0039] Embodiment 2 of the present invention provides an electrolyte solution for enhancing the safety of lithium-ion batteries. The electrolyte solution is mainly prepared by mixing the following components in parts by weight: 8 parts of lithium salt, 85 parts of organic solvent, 4 parts of additives and composite resistors. 3 parts fuel.

[0040] Among them, the lithium salt is lithium hexafluorophosphate (LiPF 6 ), its concentration is 1.05mol / L.

[0041] The organic solvent is mainly made by mixing ethyl methyl carbonate (EMC), dimethyl carbonate (DMC) and ethylene carbonate (EC) in a mass ratio of 1:3:1.5.

[0042] The additive is mainly made by uniformly mixing vinylene carbonate (VC), fluoroethylene carbonate (FEC) and 1,3-propane sultone (1,3-PS) in a mass ratio of 2:1:1.

[0043] The composite flame retardant is trifluoromethoxyphosphazene.

Embodiment 3

[0045] Embodiment 3 of the present invention provides an electrolyte solution for enhancing the safety of lithium-ion batteries. The electrolyte solution is mainly prepared by mixing the following components in parts by weight: 15 parts of lithium salt, 80 parts of organic solvent, 4 parts of additives and composite resistors. 3 parts fuel.

[0046] Among them, the lithium salt is lithium hexafluorophosphate (LiPF 6 ), its concentration is 1.05mol / L.

[0047] The organic solvent is mainly made by mixing ethyl methyl carbonate (EMC), dimethyl carbonate (DMC) and ethylene carbonate (EC) in a mass ratio of 1:2:1.

[0048] The additive is mainly made by uniformly mixing vinylene carbonate (VC), fluoroethylene carbonate (FEC) and 1,3-propane sultone (1,3-PS) at a mass ratio of 2:1.5:1.

[0049] The composite flame retardant is trifluoroethylphosphazene, whose chemical structure is shown in formula III:

[0050]

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Abstract

The invention discloses a composite flame retardant and an electrolyte for enhancing the safety of a lithium ion battery, and belongs to the technical field of lithium ion batteries. The composite flame retardant contains a plurality of effective flame retardant elements; due to the synergistic effect of the flame retardant elements, the characteristics of the plurality of flame retardants can beintegrated, and therefore, the use amount of the flame retardant can be reduced, and the flame retardant effect of the flame retardant can be improved. The electrolyte is mainly prepared by mixing thefollowing components in parts by weight: 8-15 parts of lithium salt; 78-87 parts of an organic solvent; 2-5 parts of an additive; and 2-3 parts of a composite flame retardant. The electrolyte is goodin flame retardant effect, good in stability, excellent in electrochemical performance and relatively good in safety performance.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a composite flame retardant and an electrolyte solution for enhancing the safety of lithium ion batteries. Background technique [0002] In recent years, lithium-ion batteries have been widely used due to their high energy density, high charging efficiency, excellent cycle performance, and easy production and processing. At the same time, safety accidents caused by the abuse of lithium-ion batteries occur from time to time, most of which are due to the overheating of the electrolyte, which causes the battery to expand, leak or even burn and explode. These lithium-ion batteries, especially the unsafe electrolyte, have extremely serious potential safety hazards. Therefore, the development of safe electrolytes has become the main way to solve the safety problems of lithium-ion batteries today. [0003] At present, safe electrolytes include methods such as...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07F9/06H01M10/0525H01M10/0567H01M10/42
CPCC07F9/065H01M10/0567H01M10/0525H01M10/4235Y02E60/10
Inventor 邵俊华孔东波王郝为王亚洲宋东亮韩飞乔文忠郭飞张利娟
Owner HENAN FAENLAITE NEW ENERGY SCI & TECH CO LTD