Electrolyte for Lithium Secondary Battery and Lithium Secondary Battery Containing the Same

A secondary battery and electrolyte technology, applied in the field of lithium secondary battery electrolyte and lithium secondary battery containing the same, can solve the problems of high volatility and high flammability, and achieve improved discharge Capacity, excellent life characteristics, the effect of improving the capacity recovery rate

Inactive Publication Date: 2016-03-23
SK INNOVATION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these organic electrolytes are generally volatile and highly flammable, so when they are applied to lithium-ion secondary batteries, when internal heat is generated by overcharging or overdischarging, fires may occur due to internal short circuits. Safety issues at high temperatures

Method used

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  • Electrolyte for Lithium Secondary Battery and Lithium Secondary Battery Containing the Same
  • Electrolyte for Lithium Secondary Battery and Lithium Secondary Battery Containing the Same
  • Electrolyte for Lithium Secondary Battery and Lithium Secondary Battery Containing the Same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0113] [Example 1] (4R,5R)-1,3,2-diazolethiophene-4,5-dicarboxylic acid dimethyl ester 2-oxide (dimethyl(4R,5R)-1,3,2-dioxathiolane- 4,5-dicarboxylate2-oxide, hereinafter also referred to as 'PEA96') synthesis

[0114] In a 100ml round bottom flask, 3.56g of dimethyl-L-tartrate (dimethyl-L-tartrate, 20mmol) and 3.96g of pyridine (pyridine, 50mmol) were dissolved in 40ml of dichloromethane, and then The temperature dropped to 0°C. Under a nitrogen atmosphere, 2.86 g of thionyl chloride (24 mmol) was slowly injected for 30 minutes, and then the temperature was raised to normal temperature. After reacting at normal temperature for 15 minutes, 30 ml of distilled water was added to complete the reaction. After separating the organic layer and the aqueous layer, the aqueous layer was extracted again with 20 ml of dichloromethane, thereby collecting the organic layer, and, for the organic layer, after washing once with 20 ml of 1N HCl solution, washed with 20 ml of saturated sodium...

Embodiment 2

[0116] [Example 2] (4R,5R)-1,3,2-dioxathiophene-4,5-dicarboxylic acid diethyl ester 2-oxide (diethyl(4R,5R)-1,3,2-dioxathiolane -4,5-dicarboxylate2-oxide, hereinafter also referred to as 'PEA97') synthesis

[0117] In a 100ml round bottom flask, 4.12g of diethyl-L-tartrate (diethyl-L-tartrate, 20mmol) and 3.96g of pyridine (pyridine, 50mmol) were dissolved in 40ml of dichloromethane, and then The temperature dropped to 0°C. Under a nitrogen atmosphere, 2.86 g of thionyl chloride (24 mmol) was slowly injected for 30 minutes, and then the temperature was raised to normal temperature. After reacting at normal temperature for 15 minutes, 30 ml of distilled water was added to complete the reaction. After separating the organic layer and the aqueous layer, the aqueous layer was extracted again with 20 ml of dichloromethane, thereby collecting the organic layer, and, for several layers, after washing once with 20 ml of 1N HCl solution, washed with 20 ml of saturated sodium bicarbon...

Embodiment 3

[0119] [Example 3] (4R,5R)-1,3,2-Dioxazolethiophene-4,5-dicarboxylic acid diisopropyl ester 2-oxide (diisopropyl(4R,5R)-1,3,2- dioxathiolane-4,5-dicarboxylate2-oxide, hereinafter, also known as 'PEA98')

[0120] In a 100ml round bottom flask, 4.69g of diisopropyl-L-tartrate (diisopropyl-L-tartrate, 20mmol) and 3.96g of pyridine (pyridine, 50mmol) were dissolved in 40ml of dichloromethane, after The temperature was lowered to 0 °C. Under a nitrogen atmosphere, 2.86 g of thionyl chloride (24 mmol) was slowly injected for 30 minutes, and then the temperature was raised to normal temperature. After reacting at normal temperature for 15 minutes, 30 ml of distilled water was added to complete the reaction. After separating the organic layer and the aqueous layer, the aqueous layer was extracted again with 20 ml of dichloromethane, thereby collecting the organic layer, and, for several layers, after washing once with 20 ml of 1N HCl solution, washed with 20 ml of saturated sodium b...

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Abstract

Provided are an electrolyte for a lithium secondary battery and a lithium secondary battery containing the same. The lithium secondary battery using the electrolyte for a lithium secondary battery according to the present invention has excellent high-temperature stability, high-temperature capacity recovery rate, low-temperature discharge capacity, and life cycle characteristics.

Description

technical field [0001] The present invention relates to a lithium secondary battery electrolyte and a lithium secondary battery containing the same, more specifically, to a lithium secondary battery electrolyte containing a heterocyclic compound containing a sulfite group (sulfitegroup) in the ring and A lithium secondary battery including the same. Background technique [0002] Recently, with the widespread popularization of mobile electronic devices, and with the miniaturization, thinning and light weight of these mobile electronic devices, people are focusing on the miniaturization and weight reduction of secondary batteries used as power sources for mobile electronic devices, and Extensive research has been carried out on the ability to charge and discharge batteries for a long time. [0003] Lithium secondary batteries generate electrical energy through oxidation and reduction reactions when lithium ions are inserted and removed from the positive and negative electrode...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/052
CPCH01M10/052H01M10/0567H01M10/0525H01M10/0568H01M10/0569H01M2220/30H01M2300/0037Y02E60/10
Inventor 金镇诚金喆禹吴承娟李光国李成日
Owner SK INNOVATION CO LTD
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