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Lithium ion battery low-temperature electrolyte and preparation method thereof

A lithium-ion battery and electrolyte technology applied in the field of lithium-ion batteries to achieve good cycle stability, good high and low temperature charge and discharge performance, and good high and low temperature charge and discharge performance

Inactive Publication Date: 2014-04-30
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But lithium-sulfur batteries have obvious safety issues

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] The concentration of lithium difluorodioxalate borate is 0.6 mol / L, and the weight percent composition of organic solvent and additives is as follows: ethylene carbonate 90%, hydroxy carboxylic acid 10%.

[0014] The preparation method is as follows: First, weigh the organic solvent and additives according to the proportion, then fully mix the organic solvent evenly in a drying room with a humidity less than 1%, configure it as an electrolyte solvent, then add additives, and then add lithium salt. After fully dissolving, leave it aside for 24 hours; the low-temperature electrolyte solution of the present invention is obtained.

Embodiment 2

[0016] The concentration of lithium dioxalate borate and lithium difluorodioxalate borate is 1.5 mol / L, and the weight percentage of organic solvent and additive is composed of: ethylene carbonate 40%, ethyl methyl carbonate 20%, propylene carbonate 20%, Diphenyl carbonate 10%, hydroxycarboxylic acid 5%, pyrimidine 5%.

[0017] The preparation method is as follows: First, weigh the organic solvent and additives according to the proportion, then fully mix the organic solvent evenly in a drying room with a humidity less than 1%, configure it as an electrolyte solvent, then add additives, and then add lithium salt. After fully dissolving, leave it aside for 24 hours; the low-temperature electrolyte solution of the present invention is obtained.

Embodiment 3

[0019] The concentration of lithium hexafluorophosphate is 1.1mol / L, and the weight percentage of organic solvent and additive is composed of: ethylene carbonate 25%, dimethyl carbonate 50%, methyl formate 5%, tetrahydrofuran 5%, hydroxycarboxylic acid 8%, cycloalkane Base benzene 4%, diphenyl carbonate 3%.

[0020] The preparation method is as follows: First, weigh the organic solvent and additives according to the proportion, then fully mix the organic solvent evenly in a drying room with a humidity less than 1%, configure it as an electrolyte solvent, then add additives, and then add lithium salt. After fully dissolving, leave it aside for 24 hours; the low-temperature electrolyte solution of the present invention is obtained.

[0021] After testing, the low-temperature electrolyte prepared in Examples 1-3 of the present invention and the developed lithium vanadium phosphate battery are charged and discharged at 0.2C, and the specific capacity of the material reaches 170mAh...

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PUM

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Abstract

The invention discloses lithium ion battery low-temperature electrolyte. The electrolyte consists of an organic solvent, an additive and lithium salt, wherein the concentration of the lithium salt is 0.6 to 1.5mol / L, and the weight percents of the organic solvent and additives is as follows: 70 to 98 percent of the organic solvent, and 2 to 30 percent of the additive; the organic solvent is selected from one or more of ethylene carbonate, diethyl carbonate, methyl formate, methyl carbonate, tetrahydrofuran, ethyl methyl carbonate and propene carbonate; the additive is selected from one or more of hydroxycarboxylic acid, naphthenic benzene, diphenyl carbonate, dihydroxybenzene aromatic oxide aryl oxide, pyrimidine and a porphyrin compound; the lithium salt is selected from one or more of lithium bis(oxalate)borate, lithium hexafluorophosphate and lithium difluoro(oxalato)borate. The electrolyte is good in high-low-temperature charging-discharging performance and cycling stability. The normal-temperature electric performance of the electrolyte is not sacrificed. The gram capacity of a positive material can be maintained.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a low-temperature electrolyte for lithium-ion batteries and a preparation method thereof. Background technique [0002] Due to the advantages of light weight, high specific energy and long life, lithium-ion batteries are widely used in various electronic devices once they are marketed. Among them, the flexible packaging lithium-ion battery also has the advantages of simple packaging, easy to change the geometric shape of the battery, ultra-light, ultra-thin and high safety, and has become the preferred power source for many mobile electronic products. In addition to civilian electronic products, lithium-ion batteries have gradually replaced traditional nickel-cadmium batteries to become the mainstream power supply in the field of military communications, and are also the key direction for the development of new communication power supplies. Military communication p...

Claims

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Application Information

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IPC IPC(8): H01M10/0569H01M10/058
CPCH01M10/0569H01M10/058Y02E60/10Y02P70/50
Inventor 杨震宇陈付春张宁古宁宇
Owner NANCHANG UNIV
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