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Nonaqueous electrolyte, and rechargeable battery with the nonaqueous electrolyte

A non-aqueous electrolyte, non-aqueous electrolyte technology, applied in secondary batteries, circuits, electrical components, etc., can solve problems such as high risk, easy ignition, fire and explosion

Inactive Publication Date: 2010-03-03
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0021] However, the above-mentioned organic solvent is volatile and easily ignites. Therefore, for a non-aqueous electrolyte battery using an electrolyte solution containing a large amount of the above-mentioned organic solvent, when heating, when the battery is internally short-circuited, when the battery is externally short-circuited, or overcharged There is a potential danger of fire and explosion in the event of misuse, abuse, or accident, especially when a large battery is intended to be used as a power supply for an automobile.

Method used

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  • Nonaqueous electrolyte, and rechargeable battery with the nonaqueous electrolyte
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  • Nonaqueous electrolyte, and rechargeable battery with the nonaqueous electrolyte

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preparation example Construction

[0339]

[0340] The non-aqueous electrolyte of the present invention 1 can be prepared by dissolving the electrolyte, the "monofluorophosphate and / or difluorophosphate" of the present invention 1, the "iron group compound" and the "other additives" used as required in a non-aqueous solvent. " to prepare.

[0341] When preparing non-aqueous electrolytic solution, it is preferable to use various raw materials of non-aqueous electrolytic solution, i.e. lithium salt, monofluorophosphate and / or difluorophosphate of the present invention 1, iron group compound, non-aqueous solvent, and other auxiliary The agent is dehydrated in advance. The degree of dehydration is generally desirably dehydrated to 50 ppm or less, preferably 30 ppm or less. In addition, the ppm mentioned in this specification means the ratio based on weight basis.

[0342] If water exists in the non-aqueous electrolytic solution, electrolysis of water, reaction of water and lithium metal, hydrolysis of lithium s...

Embodiment 1

[1117] The electrolyte LiPF was dissolved in a mixed solvent of ethylene carbonate (EC) and ethyl methyl carbonate (EMC) (mixing volume ratio 2:8) at a ratio of 1mol / L. 6 The electrolyte is used as the basic electrolyte (I), and lithium difluorophosphate (LiPO 2 f 2 ), and nickel(II) hexafluorophosphate (Ni(PF 6 ) 2 ), so that their concentrations relative to the non-aqueous electrolytic solution are 0.5% by weight and 20 ppm (in terms of the concentration of Ni element, equivalent to 3.4 ppm), and the non-aqueous electrolytic solution is made. Using the obtained nonaqueous electrolyte solution, a nonaqueous electrolyte secondary battery was manufactured according to the above-mentioned method, and capacity evaluation and cycle characteristic evaluation were performed. The results are shown in Table 1.

Embodiment 2

[1119] Lithium difluorophosphate (LiPO 2 f 2 ), and nickel(II) hexafluorophosphate (Ni(PF 6 ) 2 ), so that their concentrations relative to the non-aqueous electrolytic solution are 0.5% by weight and 50ppm (in terms of the concentration of Ni element, equivalent to 8.4ppm), the non-aqueous electrolytic solution is made, and the non-aqueous electrolytic solution is used to make according to the above method Non-aqueous electrolyte secondary batteries, and conduct capacity evaluation and cycle characteristic evaluation. The results are shown in Table 1.

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Abstract

A subject is to provide a nonaqueous electrolyte excellent in cycle performances such as capacity retention after cycling, output after cycling, discharge capacity after cycling, and cycle discharge capacity ratio, output characteristics, high-temperature storability, low-temperature discharge characteristics, heavy-current discharge characteristics, high-temperature storability, safety, high capacity, high output, high-current-density cycle performances, compatibility of these performances, etc. Another subject is to provide a nonaqueous-electrolyte secondary battery employing the nonaqueouselectrolyte. The subjects have been accomplished with a nonaqueous electrolyte which contains a monofluorophosphate and / or a difluorophosphate and further contains a compound having a specific chemical structure or specific properties.

Description

technical field [0001] The present invention relates to a nonaqueous electrolytic solution for secondary batteries and a nonaqueous electrolyte secondary battery using the nonaqueous electrolytic solution. More specifically, the present invention relates to a nonaqueous electrolytic solution containing specific components and a nonaqueous electrolytic solution using the nonaqueous electrolytic solution. Aqueous electrolyte secondary battery. Background technique [0002] In recent years, along with the miniaturization of electronic equipment, the demand for higher capacity of secondary batteries has been increasing, and lithium secondary batteries with higher energy density than nickel-cadmium batteries and nickel-hydrogen batteries have attracted attention. [0003] As the electrolyte solution of lithium secondary battery, what has been adopted is to make LiPF 6 、LiBF 4 , LiClO 4 、LiCF 3 SO 3 , LiAsF 6 , LiN(CF 3 SO 2 ) 2 、LiCF 3 (CF 2 ) 3 SO 3 The electrolyte ...

Claims

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Application Information

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IPC IPC(8): H01M10/40H01M10/0567H01M10/0568
CPCY02E60/12Y02E60/10
Inventor 加藤竜一德田浩之藤井隆古田土稔竹原雅裕大贯正道大桥洋一木下信一
Owner MITSUBISHI CHEM CORP
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