Electrolyte for power storage devices and nonaqueous electrolyte solution
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A technology for electrical storage devices and electrolytes, applied in the field of electrolytes, can solve the problems of difficult electrical storage devices, lack of solubility, etc., and achieve the effects of low resistance, good initial characteristics, and excellent cycle characteristics
Active Publication Date: 2020-11-20
富山药品工业株式会社
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However, these lithium compounds generally lack solubility in non-aqueous electrolytes, so it is difficult to use them as electrolytes for electrical storage devices.
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[0164] Hereafter, although an Example demonstrates this invention more concretely, this invention is not limited to these Examples, It can change within the scope of this invention.
[0165]
[0166] Using the following positive electrode and the following negative electrode, the positive electrode and the negative electrode were wound into a case with a separator (F23DHA, manufactured by Toray Battery Separator Film Co., Ltd.) with a thickness of 23 μm interposed therebetween. 30mm x 2.0mm thick rectangular parallelepiped battery cell.
[0167] Positive electrode: 5% by mass of polyvinylidene fluoride as a binder, 4% by mass of acetylene black as a conductive agent, and LiNi, a positive electrode active material as a composite oxide powder of lithium, nickel, manganese and cobalt 0.6 mn 0.2 co 0.2 o 2 N-methylpyrrolidone was added to the positive electrode mixture obtained by mixing 91% by mass to form a paste, which was applied to both sides of an aluminum foil collect...
manufacture example 1
[0184] Under an argon atmosphere, 100 ml of methanol was poured into a 500 ml Erlenmeyer flask, 30 g of lithium oxide was added, and the mixture was cooled to 10° C. while stirring. Next, 290 g of the boron trifluoride methanol complex was added over 5 hours while stirring the above mixed liquid at 10° C., and then the reaction liquid was kept at 50° C. and stirred for 3 hours.
[0185] Then, the reaction solution was concentrated to remove methanol to obtain lithium oxide / 2BF 3 Crude product of the complex. The resulting lithium oxide / 2BF 3 The crude product of the complex was washed three times with 50 ml of dibutyl ether to remove excess boron trifluoride methanol complex. And, the obtained solid was dried under reduced pressure in an atmosphere of 110° C. for 10 hours to obtain 157 g of lithium oxide and 2BF 3 Complex O-(BF 3 Li) 2 .
[0186]As a result of analyzing the obtained solid matter using ICP, the boron element was 99.5 relative to lithium 100.
manufacture example 2
[0188] Except that 132 g of boron trifluoride methanol complex was used instead of 290 g of boron trifluoride methanol complex, 91 g of lithium oxide / BF was obtained in the same manner as in Production Example 1. 3 Complex (O-(BF 3 Li)(Li)).
[0189] As a result of analyzing the obtained solid matter using ICP, the boron element was 48 to 100 lithium.
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Abstract
The purpose of the present invention is to provide: an enhanced electrolyte for power storage devices in which electrical resistance is reduced and it is possible to maintain high capacity even afterrepeated charging and discharging; and a power storage device. Provided is an electrolyte for power storage devices that is characterized by containing a lithium-containing complex compound represented by formula (1), formula (2), formula (3), formula (4), or formula (5) indicated below. Formula (1): (Li)m(A)n(UFx)y. Formula (2): (Li)m(Si)n(O)q(UFx)y (in formulas (1) and (2), A is O, S, P, or N, Uis a boron atom or a phosphorus atom, m and n each independently represent a number between 1 and 6 inclusive, q is a number between 1 and 12 inclusive, x is 3 or 5, and y is a number between 1 and 6inclusive). Formula (3): (Li)m(O)n(B)p(OWFq)x (in the formula, W is a boron atom or a phosphorus atom, m, p, and x each independently represent a number between 1 and 15 inclusive, n is a number between 0 and 15 inclusive, and q is 3 or 5). Formula (4): (Li)m(B)p(O)n(OR)y(OWFq)x (in the formula, W is a boron atom or a phosphorus atom, n is a number between 0 and 15 inclusive, p, m, x, and y eachindependently represent a number between 1 and 12 inclusive, q is 3 or 5, R is hydrogen, an alkyl group, an alkenyl group, an aryl group, a carbonyl group, a sulfonyl group, or a silyl group, and these groups may have a fluorine atom, an oxygen atom, and other substituent groups). Formula (5): (Li)m(O)n(B)p(OOC-(A)z-COO)y(OWFq)x (in the formula, W is a boron atom or a phosphorus atom, A is a grouphaving six carbon atoms and may be an alkylene group, an alkenylene group, an alkynylene group, a phenylene group, or an alkylene group having an oxygen atom or a sulfur atom in the main chain thereof, m, p, x, and y each independently represent a number between 1 and 20 inclusive, n is a number between 0 and 20 inclusive, n is a number between 0 and 15 inclusive, z is 0 or 1, and q is 3 or 5).
Description
technical field [0001] The present invention relates to an electrolyte for electrical storage devices such as a lithium ion secondary battery, and a nonaqueous electrolytic solution for electrical storage devices containing the same. Background technique [0002] In recent years, with the spread of various portable electronic devices such as portable electronic terminals such as mobile phones and notebook computers, secondary batteries have played an important role as their power sources. Examples of these secondary batteries include aqueous solution batteries and nonaqueous electrolyte batteries. Among them, non-aqueous electrolyte secondary batteries equipped with positive and negative electrodes capable of absorbing and releasing lithium ions, etc., and non-aqueous electrolytes are different from other secondary batteries in terms of high voltage, high energy density, excellent safety, and environmental problems. Compared with has various advantages. [0003] As a non-a...
Claims
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