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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 it, can solve the problems of high volatility and high flammability, and achieve improved battery expansion, increased discharge capacity, excellent Effect of high temperature storage characteristics

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

AI Technical Summary

Problems solved by technology

However, such an organic electrolyte is usually volatile and highly flammable. Therefore, when it is applied to a lithium-ion secondary battery, when internal heat is generated due to overcharging or overdischarging, internal short circuits may occur. Safety issues under high temperature such as fire

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

[0114] [Example 1] Tetrakis (2,2,3,3,3-pentafluoropropyl) diboronic acid ester (tetrakis (2,2,3,3,3-pentafluoropropyl) hypodiborate, hereinafter, also known as 'PEA65 ')Synthesis

[0115]

[0116] In a 100ml round bottom flask, 6.00g of 2,2,3,3,3-pentafluoro-1-propanol (2,2,3,3,3-pentafluoro-1-propanol, 40mmol) and 3.96 g of tetrakis(dimethylamino)diboron (tetrakis(dimethylamino)diboron, 20mmol) was dissolved in 30ml of heptane, and then the temperature was raised to 50°C under a nitrogen atmosphere. After reacting at 50° C. for 24 hours, the temperature was lowered to normal temperature. After filtering the crystals generated at normal temperature, the filtrate was vacuum-dried to obtain 8.0 g of the title compound.

[0117] 1 H-NMR (400MHz, CDCl 3 )δ: 4.18(t, J=20.9Hz, 8H)

Embodiment 2-7 and comparative example 1-2

[0119] Dissolve LiPF in a mixed solution of ethylene carbonate (EC): ethylmethyl carbonate (EMC) at a volume ratio of 3:7 6 , to obtain a 1.0M solution, and use this solution as the basic electrolyte (1MLiPF 6 , EC / EMC=3:7), and further put in the components described in the following Table 1 to prepare the electrolyte solution.

[0120] A method for preparing a battery using the non-aqueous electrolyte solution is as follows.

[0121] As the positive active material, LiNiCoMnO 2 and LiMn 2 o 4 Mixed at a weight ratio of 1:1, mixed with polyvinylidene fluoride (PVdF) as a binder and carbon as a conductive agent at a weight ratio of 92:4:4 and dispersed in N-methyl-2 -pyrrolidone, thereby preparing positive electrode slurry. This slurry was coated on an aluminum foil having a thickness of 20 μm, dried and rolled to prepare a positive electrode. Mix artificial graphite as the negative electrode active material, styrene-butadiene rubber as the binder, and carboxymethyl cell...

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Abstract

Provided are an electrolyte for a lithium secondary battery, and a lithium secondary battery containing the same, wherein the electrolyte for a secondary battery has significantly excellent high-temperature stability, low-temperature discharge capacity, and life cycle characteristics. The electrolyte for the lithium secondary battery comprises a lithium salt; a non-aqueous organic solvent; and a boron derivative represented by the following chemical formula 1. In the chemical formula 1, R1 to R4 are each independently (C1-C10)alkyl, (C6-C12)aryl or (C6-C12)ar(C1-C10)alkyl, and alkyl, aryl, and aralkyl of R1 and R2 may be further substituted with at least one substituent selected from the group consisting of cyano, hydroxyl, halogen, (C1-C10)alkyl and (C6-C12)aryl.

Description

technical field [0001] The present invention relates to an electrolyte solution for a lithium secondary battery and a lithium secondary battery containing the same, more specifically, to a lithium secondary battery electrolyte containing boron derivatives and a lithium secondary battery containing the same. Background technique [0002] Recently, with the wide spread 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 their power sources, and the ability to make batteries Extensive research has been carried out on long-term charging and discharging. [0003] Lithium secondary batteries generate electrical energy through oxidation and reduction reactions when lithium ions are inserted and removed from the positive and negative electrodes. Between the positive electrode and the negative electrode, an organic elect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525C07F5/02
CPCC07F5/02H01M10/0525H01M10/0567H01M10/0568H01M10/0569H01M2220/30H01M2300/0034H01M2300/0037Y02E60/10H01M10/052
Inventor 金镇诚金喆禹吴承娟李光国李成日
Owner SK ON CO LTD
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