Electrolyte and lithium ion secondary battery including the same

A secondary battery and electrolyte technology, which is applied in the field of electrolyte for lithium-ion secondary batteries and lithium-ion secondary batteries, and can solve problems such as reducing the effective capacity of graphite negative electrodes and deteriorating battery high-rate cycle life

Inactive Publication Date: 2010-02-03
SAMSUNG SDI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, ionic liquids reduce the effective capacity of graphite anodes, leading to the deterioration of high battery efficiency and / or cycle life.

Method used

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  • Electrolyte and lithium ion secondary battery including the same
  • Electrolyte and lithium ion secondary battery including the same
  • Electrolyte and lithium ion secondary battery including the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0084] The cathode active material LiCoO 2 , a binder polyvinylidene fluoride (PVdF), and a conductive material carbon were mixed in N-methyl-2-pyrrolidone at a weight ratio of 92:4:4 to prepare a slurry for a positive electrode active material. The resulting slurry was coated on an aluminum foil, dried and rolled to prepare a positive electrode plate. 97 wt % of artificial graphite as a negative active material and 3 wt % of polyvinylidene fluoride (PVdF) as a binder were mixed and dispersed in water to prepare a negative active material slurry. The resulting slurry was coated on a copper foil, dried and rolled to prepare a negative electrode plate.

[0085] A separator made of polyethylene (PE) was inserted between the electrodes, wound, pressed and inserted into a prismatic can (46mmx34mmx50mm).

[0086] LiPF 6 Add ethylene carbonate and ethyl methyl carbonate with 3:7 (v / v) in the mixed solvent that mixes, until final concentration reaches 1.3M, and the ionic liquid N-m...

Embodiment 2

[0089] A lithium-ion secondary battery was manufactured in the same manner as in Example 1, except that 1 part by weight of lithium fluorooxalate borate was added.

Embodiment 3

[0091] A lithium ion secondary battery was manufactured in the same manner as in Example 1, except that 40 parts by weight of MPPTFSI (N-methylpropylpyrrolidinium bis(trifluoromethanesulfonyl)imide) was used as the ionic liquid.

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Abstract

An electrolyte for a lithium ion secondary battery is provided. The electrolyte includes a non-aqueous organic solvent, a lithium salt, an ionic liquid and an additive. The additive has a lowest unoccupied molecular orbital (LUMO) level of -0.5 to 1.0 eV and a highest occupied molecular orbital (HOMO) level lower than -11.0 eV. Further provided is a lithium ion secondary battery including the electrolyte. The battery is advantageous in terms of overcharge safety and heat stability. In addition, the battery has improved high-efficiency properties and cycle life characteristics.

Description

[0001] Cross References to Related Applications [0002] This application claims priority and benefit from Korean Patent Application No. 10-2008-0074314 filed with the Korean Intellectual Property Office on Jul. 29, 2008, the entire contents of which are hereby incorporated by reference. technical field [0003] The invention relates to an electrolytic solution for a lithium ion secondary battery and a lithium ion secondary battery containing the electrolytic solution. Background technique [0004] Lithium-ion batteries have higher energy density and capacity per unit area than nickel-manganese and nickel-cadmium batteries. Therefore, compared with nickel-manganese and nickel-cadmium batteries, lithium-ion batteries have a lower self-discharge rate and a longer service life. In addition, lithium-ion batteries are convenient to use and have long-life characteristics due to the lack of memory effect. That is, the battery does not have to be fully discharged before recharging...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/40
CPCH01M10/4235Y02E60/122H01M2300/0045H01M10/0525H01M2300/0091H01M10/0569H01M10/0567Y02E60/10H01M10/05
Inventor 崔南顺伊琳娜·普罗法提洛娃许素贤宋义焕金性洙
Owner SAMSUNG SDI CO LTD
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