Nonaqueous electrolyte solution and lithium secondary battery using same

Abstract

The invention provides a non-aqueous electrolyte solution and a lithium secondary battery using the same. The non-aqueous electrolyte solution is provided that realizes a large capacity, exhibits high storage characteristics and cycle characteristics, and is capable of inhibiting gas generation. The non-aqueous electrolyte solution comprises a lithium salt and a non-aqueous solvent, and further comprises: a cyclic carbonate compound having an unsaturated bond in a concentration of 0.01 weight % or higher and 8 weight % or lower; and a compound expressed by general formula (Ib) in a concentration of 0.01 weight % or higher and 5 weight % or lower. (in the formula (Ib), R[21] represents the alkyl having 2-12 carbon atoms and containing the fluorine atom substituent; and the alkenyl having 2-12 carbon atoms and containing the fluorine atom substituent, wherein the chain in the group has ether bond).

Description

technical field [0001] The present invention relates to a nonaqueous electrolytic solution and a lithium secondary battery using the nonaqueous electrolytic solution. Background technique [0002] Non-aqueous electrolyte batteries such as lithium secondary batteries have been put into practical use in many fields of application, from so-called consumer power supplies such as cellular phones and notebook computers, to vehicle power supplies used to drive automobiles. However, in recent years, the demand for high performance of non-aqueous electrolyte batteries has been increasing, and in addition to high capacity and good high-temperature storage characteristics, excellent cycle characteristics are also required. [0003] Therefore, in order to obtain a high-capacity non-aqueous electrolyte battery, current design methods usually try to fill as much active material as possible into the limited battery volume, for example, in the method, the active material layer of the electr...

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Problems solved by technology

[0021] However, regarding the secondary battery disclosed in Patent Document 1, which uses a non-aqueous electrolytic solution containing a double bond-bearing cyclic carbonate compound, although its cycle characteristics at room temperature are improved, the presence of The problem is that it increases the amount of gas generation in the continuous charge state due to impaired cycle characteristics at low temperatures

[0022] Regarding the non-aqueous electrolytic solution containing benzenesulfonyl fluoride or p-toluenesulfonyl fluoride disclosed in Patent Document 3, there is a problem that the continuous charging characteristics at high temperatures and the high-temperature storage characteristics are impaired

[0023] Regarding Patent Document 4, it only gives an example in which the amount of the fluorine-containing ether compound is 60% by weight to 70% by weight, and does not mention battery characteristics, so there is a problem that when it is actually used in a battery, Battery characteristics such as continuous charging characteristics will decrease

So, there is a problem that the continuous charging characteristics actually degrade

[0025] In addition, as described below, when the electrolyte solutions disclosed in Patent Document 4 and Patent Document 5 are used at high voltage, there is a problem that the battery deteriorates and battery characteristics deteriorate

When adopting a battery in a continuous state of charge at a high voltage, there is a problem that the electrode at a high potential reacts with the electrolyte, resulting in increased gas generation, battery deterioration, and shortened battery life

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