Multiplex overcharging protection functional electrolyte for lithium ion battery

A technology for lithium-ion batteries and protection functions, applied in secondary batteries, circuits, electrical components, etc., can solve problems such as damage and unsolved battery performance, reduce impact and damage, improve overcharge safety performance, and reduce negative effects Effect

Inactive Publication Date: 2011-03-23
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the four published patents, lithium-ion batteries are protected against overcharging, and no specific implementation methods and principles are used to prevent multiple (times) overcharging of the battery, nor does it solve the repeated local overcharging and mild overcharging of the battery Impact on battery performance and damage issues

Method used

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  • Multiplex overcharging protection functional electrolyte for lithium ion battery
  • Multiplex overcharging protection functional electrolyte for lithium ion battery
  • Multiplex overcharging protection functional electrolyte for lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] In a glove box filled with argon or nitrogen (H 2 O≤1ppm, O 2 ≤1ppm):

[0048] (1) Preparation of lithium-ion battery electrolyte

[0049] Weigh 29.16g each of organic solvents ethylene carbonate (EC), diethyl carbonate (DEC), and dimethyl carbonate (DMC) to prepare a mixed solvent in a mass ratio of 1:1:1; weigh the electrolyte lithium hexafluorophosphate (LiPF 6 ) 12.5g, slowly added to the mixed solvent several times in batches, shake well until the lithium salt is completely dissolved and cooled to normal temperature to prepare lithium-ion battery electrolyte, that is, blank comparison electrolyte. Among them, the solvent accounts for 87.5%, and the electrolyte accounts for 12.5%;

[0050] (2) Preparation of lithium-ion battery multiple overcharge protection functional electrolyte

[0051] Weigh 97.5g of lithium-ion battery electrolyte, redox pair additive 3-chloroanisole (3CA, oxidation potential 4.5V (vs.Li / Li + )) 0.5g, electropolymerization additive bipheny...

Embodiment 2

[0055] In a glove box filled with argon or nitrogen (H2O≤1ppm, O2≤1ppm):

[0056] (1) Preparation of lithium-ion battery electrolyte

[0057] Weigh 29.16g each of organic solvents ethylene carbonate (EC), ethyl methyl carbonate (EMC), and dimethyl carbonate (DMC) to prepare a mixed solvent in a mass ratio of 1:1:1; weigh the electrolyte lithium hexafluorophosphate (LiPF 6 ) 12.5g, slowly added to the mixed solvent several times in batches, shake well until the lithium salt is completely dissolved and cooled to normal temperature to prepare lithium-ion battery electrolyte. Among them, the solvent accounts for 87.5%, and the electrolyte accounts for 12.5%;

[0058] (2) Preparation of lithium-ion battery multiple overcharge protection functional electrolyte

[0059] Weigh 96g of lithium ion battery electrolyte, redox couple additive 2,5-difluoro-1,4-dimethoxybenzene (F 2 DMB, onset oxidation potential 4.27V, peak potential 4.37V (vs.Li / Li + )) 1g, electropolymerization additi...

Embodiment 3

[0063] In a glove box filled with argon or nitrogen (H 2 O≤1ppm, O 2 ≤1ppm):

[0064] (1) Preparation of lithium-ion battery electrolyte

[0065] Weigh organic solvents ethylene carbonate (EC), diethyl carbonate (DEC), dimethyl carbonate (DMC), propylene carbonate (PC) to prepare a total of 87.5g of mixed solvents in a mass ratio of 3:3:3:1 ; Weigh the electrolyte lithium hexafluorophosphate (LiPF 6 ) 12.5g, slowly added to the mixed solvent in batches several times, shake well until the lithium salt is completely dissolved and cooled to normal temperature to prepare lithium-ion battery electrolyte;

[0066] (2) Preparation of lithium-ion battery multiple overcharge protection functional electrolyte

[0067] Weigh 97.5g of lithium-ion battery electrolyte, redox pair additive 3-chloroanisole (3CA, oxidation potential 4.5V (vs.Li / Li + )) 0.5g, gas generating additive pyrocarbonate 2g, add together to the lithium ion battery electrolyte, shake well and disperse evenly to pre...

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Abstract

The invention belongs to secondary electrolyte for a lithium ion battery, and in particular relates to functional electrolyte used under the condition of overcharging or misuse of the lithium ion battery. The multiplex overcharging protection functional electrolyte for the lithium ion battery adopts oxidation reduction to combine an overcharging additive and one or more of an electropolymerizationadditive or a gas generation additive, not only can solve the problem of overcharging safety of a commercialized small-scale lithium ion battery under the condition of 3C / 10V but also can greatly improve the safety performance of a dynamic lithium ion battery through the combination of different additives, can prevent the influence and the damage of repeated local overcharging or slight overcharging of the lithium ion battery on the battery performance through combination of the different additives according to certain sequence and principle, and can reduce the negative effects of the additives on other battery performances by optimization of the different additives according to different proportions.

Description

technical field [0001] The invention belongs to the secondary lithium ion battery electrolyte, in particular to a functional electrolyte suitable for use under the overcharge or abuse conditions of the lithium ion battery. Background technique [0002] With the aggravation of environmental pollution, lack of energy and the promulgation and implementation of ROHS directives (battery cadmium content <20ppm) in the European Union, the United States, Japan and other countries, lithium-ion batteries have high energy density, long cycle life, high working voltage, stable discharge and "Green" environmental protection and many other advantages are widely used in mobile communications, information technology, consumer electronics, aerospace and other aspects. The use of power batteries in electric tools, electric vehicles, hybrid electric vehicles and other fields has also received more and more attention, but battery safety issues have seriously restricted its promotion and appl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/36
CPCY02E60/122Y02E60/10
Inventor 黄可龙曾彪刘素琴刘建生
Owner CENT SOUTH UNIV
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