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Electrolyte And Lithium Secondary Battery Comprising The Same

A lithium secondary battery and electrolyte technology, applied in secondary batteries, non-aqueous electrolyte batteries, lithium batteries, etc., can solve problems such as low withstand voltage and achieve the effect of improving capacity retention rate

Active Publication Date: 2014-07-16
SAMSUNG SDI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Most of the solvents used in non-aqueous electrolytic solutions in conventional lithium secondary batteries have the property of low withstand voltage

Method used

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  • Electrolyte And Lithium Secondary Battery Comprising The Same
  • Electrolyte And Lithium Secondary Battery Comprising The Same
  • Electrolyte And Lithium Secondary Battery Comprising The Same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0137] With 0.45LiNi 0.5 co 0.2 mn 0.3 o 2 -0.55Li 2 MnO 3 The composition of the composite positive active material powder is the positive active material, which is uniformly mixed with a carbon conductive agent (Super-P, Timcal Co., Ltd.) at a weight ratio of 90:5, and then, polyvinylidene fluoride (PVDF) is added thereto A binder solution to prepare an active material slurry having a weight ratio of active material:carbon conductive agent:binder of 90:5:5. The active material slurry was coated on an aluminum foil to a thickness of 15 μm, followed by drying and pressing, thereby completing the fabrication of the positive electrode.

[0138] Negative electrode active material Si-Ti-Ni-like Si-alloy (Si:Ti:Ni atomic ratio is 68:16:16, and its average particle size is 5μm), binder (including 23wt% PAI and 75wt% N-methyl-2-pyrrolidone) and conductive agent Ketjen black are mixed in a weight ratio of 84:4:8, and then N-methylpyrrolidone is added to the mixture to control it...

Embodiment 2

[0141] Except that the mixing ratio of fluoroethylene carbonate, dimethyl carbonate and fluoroether (such as fluorinated ether solvent) in the electrolyte is 25:65:10, a lithium secondary battery is manufactured in the same manner as in Example 1 .

Embodiment 3

[0143] Except that the mixing ratio of fluoroethylene carbonate, dimethyl carbonate and fluoroether (such as fluorinated ether solvent) in the electrolyte is 25:45:30, a lithium secondary battery is manufactured in the same manner as in Example 1 .

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Abstract

The invention discloses an electrolyte and a lithium secondary battery comprising the same. The lithium secondary battery includes the components of: a positive electrode including an overlithiated lithium transition metal oxide with a layered structure; a negative electrode including a silicon-based negative active material; and an electrolyte that is interposed between the positive electrode and the negative electrode and includes a fluoride-based ether solvent in an amount of 3 vol% or more based on a total volume of a non-aqueous electrolytic solution.

Description

[0001] Cross references to related patent applications [0002] This application claims priority to and benefit of U.S. Provisional Application No. 61 / 753,400, filed January 16, 2013 in the United States Patent and Trademark Office, the entire contents of which are hereby incorporated by reference. technical field [0003] One or more embodiments of the present invention relate to an electrolytic solution and a lithium secondary battery including the same. Background technique [0004] Lithium secondary batteries are used in portable electronic devices for mobile communications, such as personal digital assistants (PDAs) and mobile phones, as well as notebook computers, electric bicycles, and electric cars. Lithium secondary batteries may have a discharge voltage twice that of typical batteries, and thus lithium secondary batteries have high energy density. [0005] The lithium secondary battery generates electric energy due to oxidation and reduction reactions occurring wh...

Claims

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Application Information

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IPC IPC(8): H01M10/0569
CPCH01M4/386H01M4/485H01M4/525H01M10/052H01M10/0567H01M10/0569H01M2300/0034H01M2300/004Y02E60/10H01M4/02H01M10/0525Y02T10/70
Inventor 金明勋韩万锡金胜完元正渊柳荷娜
Owner SAMSUNG SDI CO LTD
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