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Non-aqueous electrolyte and lithium secondary battery comprising same

A non-aqueous electrolyte and solution technology, applied in non-aqueous electrolyte batteries, secondary batteries, lithium batteries, etc., can solve the problem of difficulty in maintaining high temperature characteristics, and achieve the effect of improving capacity characteristics

Active Publication Date: 2015-05-06
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the case, although output characteristics are improved, there is still a problem that it is difficult to maintain high temperature characteristics equivalent to existing lithium secondary batteries due to the material characteristics of ester-based solvents

Method used

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  • Non-aqueous electrolyte and lithium secondary battery comprising same
  • Non-aqueous electrolyte and lithium secondary battery comprising same
  • Non-aqueous electrolyte and lithium secondary battery comprising same

Examples

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Embodiment approach

[0062] Hereinafter, based on examples, the present invention will be described more specifically. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. The embodiments of the present invention are intended to more fully explain the present invention to those skilled in the art.

Embodiment 1

[0066] [Preparation of non-aqueous electrolyte solution]

[0067] Add 0.1 mol / L LiPF 6 and 0.9 mol / L lithium bis(fluorosulfonyl)imide (based on the total weight of the nonaqueous electrolyte solution), the nonaqueous electrolyte solution can be prepared.

[0068] [Preparation of Lithium Secondary Battery]

[0069] Add 89% by weight of positive electrode active material Li(Ni) to N-methyl-2-pyrrolidone (NMP) solvent 0.33 co 0.33 mn 0.33 )O 2 , 8% by weight of conductive agent carbon black (carbon black) and 3% by weight of binder polyvinylidene fluoride (PVdF), the positive electrode mixture slurry can be prepared. An approximately 20 μm thick positive electrode collector aluminum (Al) film was coated with the positive electrode mixture slurry and dried, followed by roll press to prepare a positive electrode.

[0070] And, adding 97% by weight of negative electrode active material carbon powder, 2% by weight of binder PVdF, and 1% by weight of conductive agent carbon bla...

Embodiment 2

[0073] Prepare non-aqueous electrolyte solution and lithium secondary battery with the same method as embodiment 1, difference is to use the LiPF of 0.14 mol / L 6 and 0.86 mol / L lithium bis(fluorosulfonyl)imide (molar ratio about 1:6) as a lithium salt, based on the total weight of the non-aqueous electrolyte solution.

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Abstract

Provided are a non-aqueous electrolyte solution, which includes a non-aqueous organic solvent including propylene carbonate (PC) and an ester-based solvent, and lithium bis(fluorosulfonyl)imide (LiFSI), and a lithium secondary battery including the non-aqueous electrolyte solution. According to the non-aqueous electrolyte solution of the present invention, since a robust solid electrolyte interface (SEI) may be formed on an anode during initial charge of a lithium secondary battery including the non-aqueous electrolyte solution, high-temperature cycle characteristics and capacity characteristics after high-temperature storage as well as low-temperature, room temperature, and high-temperature output characteristics may be simultaneously improved.

Description

technical field [0001] The present invention relates to a non-aqueous electrolyte solution comprising a non-aqueous organic solvent containing propylene carbonate (PC) and an ester-based solvent and lithium bis(fluorosulfonyl)imide (LiFSI); and relates to a non-aqueous electrolyte solution comprising lithium secondary battery. Background technique [0002] As technological development and demand for mobile devices have increased, the demand for secondary batteries as an energy source has also increased dramatically. Among these secondary batteries, lithium secondary batteries having high energy density and high voltage have been commercialized and widely used. [0003] Lithium metal oxide is used as a cathode active material of a lithium secondary battery, and lithium metal, lithium alloy, crystalline or amorphous carbon, or a carbon composition is used as an anode active material. A current collector may be coated with an appropriate thickness and length of the above acti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0568H01M10/052
CPCH01M10/052H01M10/0567H01M10/0568H01M10/0569Y02E60/10
Inventor 林永敏李哲行梁斗景金宝基
Owner LG ENERGY SOLUTION LTD
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