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Electrolyte for lithium ion rechargeable battery and lithium ion rechargeable battery including the same

A recharging and electrolyte technology, applied in the field of electrolyte, can solve the problems of other battery performance deterioration, charge/discharge cycle performance reduction, etc., and achieve the effect of maintaining cycle life

Active Publication Date: 2008-09-17
SAMSUNG SDI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] However, in the case of adding specific compounds to the electrolyte to improve battery performance, there are still some problems, namely: while some properties of the battery are improved, other properties of the battery are deteriorated
For example, if the additive is added to the electrolytic solution, there will be a problem that the low-temperature performance is improved, but the charge / discharge cycle performance is reduced

Method used

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  • Electrolyte for lithium ion rechargeable battery and lithium ion rechargeable battery including the same
  • Electrolyte for lithium ion rechargeable battery and lithium ion rechargeable battery including the same
  • Electrolyte for lithium ion rechargeable battery and lithium ion rechargeable battery including the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] LiCoO as the cathode active material 2 , polyvinylidene fluoride (PVDF) as a binder and carbon as a conductive material are mixed in a weight percentage of 92:4:4, and then dispersed in N-methyl-2-pyrrolidone (NMP) to prepare a cathode slurry. The slurry was coated on a 20 micron thick aluminum foil, dried and rolled to obtain a cathode. Artificial graphite as an anode active material, styrene-butadiene rubber as a binder, and carboxymethyl cellulose as a thickener were mixed in a weight percentage of 96:2:2, and then dispersed in water to prepare an anode slurry. The slurry was coated on a 15 micron thick copper foil, dried and rolled to obtain an anode. After a 20 μm-thick film separator made of polyethylene was inserted between the above-mentioned electrodes, it was rolled up, compressed and inserted into an angular tank measuring 55×34×50 mm. An electrolytic solution was injected into the angular tank to prepare a lithium rechargeable battery. Described electrol...

Embodiment 2

[0046] This example was carried out in the same manner as Example 1, except that 1 wt% of vinyl ethylene carbonate and 3 wt% of fluoroethylene carbonate were added.

Embodiment 3

[0048] This example was carried out in the same manner as Example 1, except that 1 wt% of vinyl ethylene carbonate and 5 wt% of fluoroethylene carbonate were added.

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Abstract

An electrolyte for the lithium rechargeable battery includes a non-aqueous organic solvent, lithium salts, vinylethylene carbonate and fluoroethylene carbonate. With this electrolyte, the ba0ttery life can be improved, and the storing property at a high temperature can be improved because the increasing rate of the battery thickness according to the increased internal pressure in the battery due to the gas generation is reduced when being kept at the high temperature, and the discharging property at a low temperature is improved because the discharge capacity can be increased when discharging at the low temperature.

Description

[0001] CROSS-REFERENCE AND PRIORITY STATEMENTS TO RELATED APPLICATIONS [0002] The present invention was submitted to the Korean Intellectual Property Office on March 12, 2007 in accordance with the requirements of 35 U.S.C § 119. All rights and interests of Korean Patent Application Serial No. 10-2007-23997 are hereby incorporated by reference. technical field [0003] The present invention relates to an electrolyte solution for a lithium rechargeable battery, and a lithium rechargeable battery comprising the electrolyte, in particular to a lithium rechargeable battery comprising a non-aqueous organic solvent, lithium salt, halogenated ethylene carbonate and ethylene carbonate An electrolytic solution for a lithium rechargeable battery using ethylene glycol, and a lithium rechargeable battery including the electrolytic solution. Background technique [0004] A battery is a device that converts generated chemical energy into electrical energy through electrochemical oxidat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/02H01M10/40H01M10/0525H01M10/0567H01M10/0569H01M10/36
CPCH01M10/4235H01M10/0525H01M10/0567H01M10/0569Y02E60/122Y02E60/10
Inventor 金镇诚李夏英金振范金溶植朴娜来
Owner SAMSUNG SDI CO LTD
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