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Electrolyte for xecondary battery and secondary battery using said electrolyte

A secondary battery and electrolyte technology, applied in the field of electrolyte, can solve the problems of long-term continuous control of surface film, etc., and achieve the effects of reducing the effect of elution, increasing inhibition, and resistance inhibition

Inactive Publication Date: 2004-05-12
NEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, no method for long-term continuous control of the surface film properties has been proposed, and thus it is desirable to develop an electrolyte that is stable relative to the anode material and beneficial for effective charge-discharge efficiency

Method used

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  • Electrolyte for xecondary battery and secondary battery using said electrolyte
  • Electrolyte for xecondary battery and secondary battery using said electrolyte
  • Electrolyte for xecondary battery and secondary battery using said electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0098] (Preparation of battery)

[0099] The preparation of the battery according to this example will be described below. Aluminum foil with a thickness of 20 μm was used as the cathode active material, LiMn 2 o 4 Used as an anode active material. Copper foil with a thickness of 10 μm was used as the anode conductive electrode, and metallic lithium was deposited on the copper foil as an anode active material to a thickness of 20 μm to form the anode. Using a mixed solvent of EC and DEC (volume ratio 30:70) as the electrolyte, 1 mole per liter of LiN(C 2 f 5 SO 2 ) 2 (hereinafter abbreviated as LiBETI) was dissolved in the above solvent as a supporting electrolyte, and Compound No. 1 shown in the above Table-1 was also added to obtain a concentration of Compound No. 1 of 1% wt. Then, the anode and the cathode were laminated in which a separator including polyethylene was provided to form a laminate packaged secondary battery.

[0100] (charge-discharge cycle test)

[...

Embodiment 2-4

[0103] A secondary battery was prepared in the same manner as in Example 1 except that Compound No. 1 was replaced with the compounds shown in Table-2. Battery characteristics were also tested in the same manner as in Example 1. The results are shown in Table-2.

Embodiment 5

[0111] A secondary battery was prepared in the same manner as in Example 1, except: LiPF for LiBRTI used to support the electrolyte 6 Alternatively, the anode was prepared as follows: a slurry mixture of graphite powder, a solvent of N-methyl 1-2-pyrrolidone and a binder of a mixture of polyvinylidene fluoride and conductive material dissolved in the solvent were applied on a copper foil, dried produced copper foil. In this example, a cylindrical secondary battery was prepared. Battery characteristics were tested in the same manner as in Example 1. The results are shown in Table-3.

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Abstract

The present invention provides a technology of inhibiting the decomposition of the solvent of the electrolyte solution for a secondary battery. Further, the present invention provides a technology of prohibiting the resistance increase of a secondary battery and improving the storage properties such as improving the capacity retention ratio. An electrolyte solution 15 comprising non-proton solvent and cyclic sulfonic ester including at least two sulfonyl groups may be used.

Description

technical field [0001] The invention relates to an electrolytic solution for a secondary battery and a secondary battery using the electrolytic solution. Background technique [0002] Nonaqueous electrolytic lithium ion secondary batteries having an anode composed of carbon materials, oxides, lithium alloys, or metallic lithium or nonaqueous electrolytic lithium secondary batteries are attracting attention as electric power sources for mobile phones or notebook computers, which This is because the battery can provide a higher energy density. [0003] It is known that a thin film, which is called a surface film, a protective film, a solid electrolyte interface (SEI) or a coating (hereinafter collectively referred to as a surface film), is formed on the surface of an anode of such a secondary battery. Since the surface film affects the charge-discharge efficiency, cycle life, and safety of secondary batteries, we know that controlling the formation of the surface film is nece...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/05H01M4/02H01M4/36H01M6/16H01M10/052H01M10/0525H01M10/0567H01M10/0569H01M10/42
CPCY02E60/122H01M10/0525H01M10/4235Y02E60/12H01M2300/004H01M2300/0037H01M10/0567Y02E60/10H01M10/052
Inventor 宇津木功二草地雄树山崎伊纪子
Owner NEC CORP
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