Lithium difluorophosphate, electrolytic solution containing lithium difluorophosphate, process for producing lithium difluorophosphate, process for producing nonaqueous electrolytic solution, nonaqueo

A technology of lithium difluorophosphate and non-aqueous electrolyte, which is applied in the direction of non-aqueous electrolyte batteries, non-aqueous electrolytes, secondary batteries, etc., and can solve the problems of high resistance, low-temperature discharge characteristics, and high-current discharge characteristics.

Active Publication Date: 2009-08-12
MITSUBISHI CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0020] However, when such a compound is contained, although the effect of improving storage characteristics and cycle characteristics is exhibited to some extent, it is difficult to form a high-resistance film on the negative electrode side. , so there is a problem that low-temperature discharge characteristics and high-current discharge characteristics are degraded

Method used

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  • Lithium difluorophosphate, electrolytic solution containing lithium difluorophosphate, process for producing lithium difluorophosphate, process for producing nonaqueous electrolytic solution, nonaqueo
  • Lithium difluorophosphate, electrolytic solution containing lithium difluorophosphate, process for producing lithium difluorophosphate, process for producing nonaqueous electrolytic solution, nonaqueo
  • Lithium difluorophosphate, electrolytic solution containing lithium difluorophosphate, process for producing lithium difluorophosphate, process for producing nonaqueous electrolytic solution, nonaqueo

Examples

Experimental program
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preparation example Construction

[0173] The preparation method of the electrolytic solution containing lithium difluorophosphate is not particularly limited as long as it does not significantly impair the effect of the present invention, but it is preferably prepared in the same way as described in "4-5. Preparation method of non-aqueous electrolytic solution". Prepare.

[0174] 《2-3. Additives》

[0175] As additives used in the electrolytic solution containing lithium difluorophosphate of the present invention, the same additives as those described in "4-4. Additives" can be used.

[0176] One kind of additives may be used alone, or two or more kinds may be used in any combination and ratio.

[0177] "2-4. With (1 / nM n+ )F - Represented Compounds》

[0178] In the electrolytic solution containing lithium difluorophosphate of the present invention, it contains 1.0×10 -2 mol Kg -1 Below (1 / nM n+ )F - .

[0179] (1 / nM n+ )F - M in is a cation other than H, and examples thereof include alkali metals, a...

Embodiment 1～23

[1512] Examples 1 to 23 will be described.

[1513]

[1514] A valve, a thermometer, a pressure gauge, and a safety valve were installed on the lid of a SUS316L airtight container with a nominal 1L (actual volume: 1.3L) as a reaction device. After the reaction device is fully dried, put it into a box filled with inert gas (nitrogen, argon, helium, etc.), add hexafluorophosphoric acid salt, solvent and specific structure compound into the reaction tank, and then put it into the tank with The stirring bar of the magnetic stirrer was covered and sealed in this state, and the reaction vessel was taken out from the box, and the reactions of Examples 1 to 23 below were carried out.

Embodiment 1～17

[1516] As Examples 1 to 17, each of the examples was reacted according to the combination of the experimental conditions described in the following Tables 1 to 3 to prepare difluorophosphate. Moreover, evaluation about each Example was performed, and the result is also shown in Table 1 - Table 3 together.

[1517] That is, in the above-mentioned reaction apparatus, the hexafluorophosphate and the specific structure compound are dissolved in a reaction solvent, and the reaction is carried out while stirring using a magnetic stirrer. In addition, in each example, the raw materials used for the reaction (hexafluorophosphate and specific structure compounds), the type and amount of the reaction solvent, and the reaction temperature and reaction time are as shown in Tables 1 to 3.

[1518] After the reaction, the reaction solvent was in the state shown in the "state after the reaction" column of Tables 1 to 3. The solid precipitated in the reaction solvent was separated according ...

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Abstract

A difluorophosphate salt, which is expensive and not readily available, can be produced with a high purity readily and efficiently from inexpensive and readily available materials. A nonaqueous electrolyte secondary battery that exhibits low-temperature discharge and heavy-current discharge characteristics and high-temperature preservation and cycle characteristics without impairing the battery safety. A hexafluorophosphate salt is reacted with a compound having a bond represented by the following formula (1) in the molecule: Si-O-Si (1). A nonaqueous electrolyte used for nonaqueous electrolyte secondary batteries including a negative electrode and a positive electrode that can occlude and discharge ions, and a nonaqueous electrolyte is prepared from a mixture obtained by mixing at least one nonaqueous solvent, a hexafluorophosphate salt and a compound having a bond represented by the following formula (1), and removing low-boiling compounds newly formed in the system, the low-boiling compounds having a lower boiling point than that of the compound having the bond represented by the formula (1): Si-O-Si (1).

Description

technical field [0001] The present invention relates to lithium difluorophosphate, an electrolytic solution containing lithium difluorophosphate, a preparation method of lithium difluorophosphate, a preparation method of a nonaqueous electrolytic solution, a nonaqueous electrolytic solution prepared by the preparation method, and a nonaqueous electrolytic solution using the nonaqueous electrolytic solution. liquid non-aqueous electrolyte secondary battery. [0002] In addition, in the present invention, "difluorophosphate" is a general term for salts formed of difluorophosphate ions and cations, and "hexafluorophosphate" is a general term for salts formed of hexafluorophosphate ions and cations. . Background technique [0003] Difluorophosphate can be used, for example, as a stabilizer for vinyl chloride polymers (Patent Document 1), a catalyst for reaction lubricating oils (Patent Document 2), a bactericide for toothbrushes (Patent Document 3), and a preservative for wood ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/40C01B25/455H01M10/0568H01M10/0567H01M10/0569
CPCY02E60/122C01B25/455H01M4/131H01M4/133H01M4/134H01M4/485H01M4/505H01M4/525H01M4/5825H01M4/587H01M10/052H01M10/0525H01M10/0567H01M10/0568H01M10/0569H01M2004/021H01M2300/0025Y02E60/10H01M10/00H01M10/05
Inventor 竹原雅裕
Owner MITSUBISHI CHEM CORP
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