KR-20260064675-A - Organic ionic crystals material containing bisammonium salt compound, method of its production, electrolyte for secondary battery comprising the same, and device comprising electrolyte for secondary battery

KR20260064675AKR 20260064675 AKR20260064675 AKR 20260064675AKR-20260064675-A

Abstract

The present invention relates to an organic ionic crystalline material comprising a bisammonium salt compound, a method for manufacturing the same, an electrolyte for a secondary battery comprising the same, and an apparatus comprising the electrolyte for a secondary battery. Specifically, the invention relates to an organic ionic crystalline material comprising a bisammonium salt compound having excellent electrochemical stability, a method for manufacturing the same, an electrolyte for a secondary battery comprising the same, and an apparatus comprising the electrolyte for a secondary battery.

Inventors

이민재
이용제
심중표
신종찬

Assignees

국립군산대학교산학협력단

Dates

Publication Date: 20260507
Application Date: 20260420
Priority Date: 20231129

Claims (2)

An organic ionic plastic crystalline material for secondary battery electrolytes comprising a bisammonium salt compound satisfying the following chemical formula 1. [Chemical Formula 1] (In the above chemical formula 1, X is one or more selected from the group consisting of Cl, Br , I, NO3 , CF3CO2 , BF4 , PF6 , SbF6 , AsF6 , ClO4 , CF3SO3 , CH3SO3 , CH3C6H5SO3 , ( FSO2 ) 2N and ( CF3SO2 ) 2N , and R is hydrogen or an alkyl group having 1 to 24 carbon atoms, and m is an integer from 2 to 12.)
In paragraph 1, The above organic ionic plastic crystalline material for secondary battery electrolytes is characterized by having a solid-solid phase transition temperature of -20 to 200°C.

Description

Organic ionic crystals material containing bisammonium salt compound, method of its production, electrolyte for secondary battery comprising the same, and device comprising electrolyte for secondary battery The present invention relates to an organic ionic crystalline material comprising a bisammonium salt compound, a method for manufacturing the same, an electrolyte for a secondary battery comprising the same, and an apparatus comprising the electrolyte for a secondary battery. Specifically, the invention relates to an organic ionic crystalline material comprising a bisammonium salt compound having excellent electrochemical stability, a method for manufacturing the same, an electrolyte for a secondary battery comprising the same, and an apparatus comprising the electrolyte for a secondary battery. The electrolyte is an essential component of a battery responsible for transporting ions between electrodes. When the electrolyte is in a liquid state, it is called a liquid electrolyte; when it is in a solid state, such as an inorganic compound or polymer, or in a gel state, it is called a solid electrolyte. Typical liquid electrolytes consist of a solvent and a salt, and generally contain several additives. In lithium-ion batteries, this electrolyte plays the role of transporting lithium ions during charging or discharging. For superior battery performance, high 1) ionic conductivity, 2) chemical and electrochemical stability with respect to the electrodes, 3) a wide operating temperature range, 4) excellent ignition safety, and 5) low cost are required. Since lithium secondary batteries operate at a high voltage, it is difficult to use electrolyte components that are highly reactive with lithium. Therefore, in the case of liquid electrolytes, polar organic solvents of the carbonate type with high dielectric constant are generally used; specifically, cyclic carbonates and diethyl carbonates are mixed to lower the viscosity. Lithium salts such as LiBF₄ , LiPF₆ , and LiN( SO₃CF₃ ) ₂ are mixed into this solvent to prepare the electrolyte, and a small amount of an electrolyte stabilizer may also be added. There are many reported examples of attempts to manufacture liquid electrolytes using ionic liquids to replace carbonate solvents, which are flammable organic solvents. Examples of using imidazolium and phosphonium-based ionic liquids in lithium-ion batteries have been reported. However, ionic liquids have disadvantages, such as being significantly more expensive than conventional carbonate solvents and failing to exhibit high ionic conductivity due to their high viscosity. In particular, despite being low-viscosity materials, phosphonium-based ionic liquids are expensive, making commercialization difficult. Various electrolyte additives are being used in consideration of the electrochemical stability and ignition risk of conventional liquid electrolytes. A representative example is vinylene carbonate as a SEI molding/controlling agent. When a LiPF6 /PC/VC electrolyte is applied to a LiMn2O4 anode , it exhibits a very stable reversible capacity up to 4.3 V. Similarly, cyclic carbonates, anhydrides, sulfones, and esters containing vinyl groups have been reported, but they have not shown performance superior to vinylene carbonate. Recent studies have attempted to use ammonium-type ionic liquids or additives as electrolytes for lithium secondary batteries. These methods include the use of imidazolium-based ionic liquids, piperidinium and piperidinium ionic liquids, or symmetric pyrrolidinium and piperidinium salts; however, they have not demonstrated superior performance or stability compared to conventional liquid electrolytes. Meanwhile, Korean Registered Patent Publication No. 10-2139215 is presented as a similar prior art document regarding this. Figure 1 is a graph showing the thermal properties of the bispiperidinium PF6 salt compound prepared in Example 2, measured by differential scanning calorimetry, as a percentage of heat flow over time. Figure 2 is a graph of the thermogravimetric analysis results over time of the bispiperidinium PF6 salt compound prepared in Example 2. Figure 3 is a graph of the stability of the bisammonium PF6 salt electrolyte prepared in Example 3 under oxidation-voltage conditions. The following describes in detail an organic ionic crystalline material comprising a bisammonium salt compound according to the present invention, a method for manufacturing the same, an electrolyte for a secondary battery comprising the same, and an apparatus comprising the electrolyte for a secondary battery. The drawings presented below are provided as examples to ensure that the concept of the present invention is sufficiently conveyed to those skilled in the art. Accordingly, the present invention is not limited to the drawings presented below and may be embodied in other forms, and the drawings presented below may be exaggerated to clarify the concept of the present invention. Unless otherwise defined