Additive for electrolytic solution, non-aqueous elecrolytic solution using said additive and secondary cell

A non-aqueous electrolyte, electrolyte technology, applied in the direction of secondary batteries, circuits, electrical components, etc.

Inactive Publication Date: 2004-02-11
MITSUI CHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] As mentioned above, although various electrolytes have been studied, vinylene carbonate-containing cannot meet the requirements. A new electrolyte is needed, which can further suppress the corrosion caused by high-temperature storage and repeated charge-discharge cycles. The reduction and decomposition reaction of the electrolyte further improves the deterioration of battery load characteristics and the reduction of battery capacity

Method used

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  • Additive for electrolytic solution, non-aqueous elecrolytic solution using said additive and secondary cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-6

[0102] Embodiment 1-6 and reference example 1

[0103] First, production of a coin-type battery will be described.

[0104] The non-aqueous electrolyte was prepared as follows. Ethylene carbonate (EC) and methyl ethyl carbonate (MEC) were mixed at a weight ratio of EC:MEC=4:5, and then LiPF as electrolyte 6 The nonaqueous electrolytic solution was prepared by dissolving in a nonaqueous solvent so that the electrolyte concentration was 1.0 mol / liter. Subsequently, 0.5% by weight of 1,3-propene sultone (Example 1), 1.0% by weight (Example 2), 1.5% by weight (Example 3), and 2.0% by weight of 1,3-propene sultone were added as additives to the non-aqueous solvent. % (embodiment 4), 2.5% by weight (embodiment 5), 3.0% by weight (embodiment 6), obtain the non-aqueous electrolytic solution of the present invention. In addition, the case where addition of an additive was omitted was made into reference example 1 (blank sample).

[0105] The negative electrode was fabricated as fol...

Embodiment 7-15

[0129] In addition to adding vinylene carbonate and adding each additive in the amount shown in Table 2 to replace 1,3-propene sultone as an additive in the preparation of the non-aqueous electrolyte in Example 1, the rest are the same as in the example 1 In the same way, a coin-type battery was produced, and its battery characteristics were measured. The results are shown in Table 2.

[0130]

[0131] From the above results, it can be seen that although the 1,3-propene sultone of the present invention alone shows an excellent effect, when it is used in combination with vinylene carbonate, it is compared with the case where the addition amount to the electrolyte is the same. , the self-discharge ratio can be reduced, and the effect of suppressing load characteristics and impedance and deterioration can be maintained at a high level.

reference example 2

[0133] A laminated battery was produced, and the amount of gas generated in the battery in a high-temperature storage test was measured.

[0134] The laminated battery was fabricated as follows.

[0135] The non-aqueous electrolytic solution prepared in Reference Example 1 above was used as the non-aqueous electrolytic solution.

[0136] The negative electrode is made as follows, 87 parts by weight of natural graphite (LF-18A type manufactured by Zhongyue Black Lead) and 13 parts by weight of the binder polyvinylidene fluoride (PVDF) are mixed, dispersed in the solvent N-methylpyrrolidone, and prepared into natural graphite mortar. Subsequently, this negative electrode paste was coated on a 18 μm thick strip-shaped copper negative electrode collector, and dried. The thickness of the natural graphite electrode is 110 μm. It was die cut to 85mm x 50mm and fitted with copper leads.

[0137] LiCoO 2 Electrodes were fabricated as follows. LiCoO 2 (Honmotosou FMC Enaji-System...

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Abstract

The purpose of this invention is to provide an electrolyte capable of suppressing decomposition of a solvent on he negative pole, suppressing energy reduction, gas and load charcteristic going worse to provide a nonaqueous electrolyte providing excellent load property and low temperature property to the battery, and provide a secondary battery containing the electrolyte and additives for it characterizing in containing unsaturated sultone nonaqueous electrolyte and secondary battery using this electrolyte and its additives composed of same compositions.

Description

technical field [0001] The present invention relates to an additive for electrolytic solution, a nonaqueous electrolytic solution having excellent life characteristics using the additive, and a secondary battery using the nonaqueous electrolytic solution. The present invention also relates to a non-aqueous electrolytic solution using the additive for electrolytic solution having excellent life characteristics, a high flash point, and excellent safety, and a secondary battery using the non-aqueous electrolytic solution. More specifically, the present invention relates to an additive for electrolytic solution composed of unsaturated sultone, a nonaqueous electrolytic solution suitable for a lithium secondary battery containing the additive, and a secondary battery using the nonaqueous electrolytic solution. Background technique [0002] Batteries using non-aqueous electrolytes are widely used as power sources for consumer electronic devices due to their high energy density at ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/40
CPCY02E60/122
Inventor 桧原昭男石田达丽平野千穗林刚史
Owner MITSUI CHEM INC
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