KR101027070B1 - Electrolyte comprising for lithium ion battery, lithium ion battery thereof and manufacturing method of lithium ion battery - Google Patents

Abstract

The present invention relates to a lithium secondary battery electrolyte comprising a triphenyl phosphate compound, a lithium secondary battery comprising the electrolyte and a method for producing the same. More specifically, in a lithium secondary battery electrolyte, the lithium secondary battery electrolyte in the following formula (1 It relates to a lithium secondary battery electrolyte containing a triphenyl phosphate compound of), a lithium secondary battery comprising the electrolyte and a method of manufacturing the same.

...화학식(1)

... Formula (1)

In Formula (1), R ₁ is oxide (O), alkyl oxide (RO), sulfide (S), alkyl sulfide (RS), methylene (CH ₂ ), succinic anhydride (C ₄ H ₄ O ₃ ) Any one selected from the group of

The alkyl group in R ₁ is any one alkyl group selected from the group of alkyl groups having 1 to 20 carbon atoms.

Triphenyl phosphate compound, lithium secondary battery electrolyte, lithium secondary battery

Description

Lithium secondary battery electrolyte containing a triphenyl phosphate compound, a lithium secondary battery comprising the electrolyte and a method for manufacturing the same {Electrolyte comprising for lithium ion battery, lithium ion battery about and manufacturing method of lithium ion battery}

The present invention relates to a lithium secondary battery electrolyte comprising a triphenyl phosphate compound, a lithium secondary battery comprising the electrolyte and a method for producing the same. More specifically, in a lithium secondary battery electrolyte, the lithium secondary battery electrolyte in the following formula (1 It relates to a lithium secondary battery electrolyte containing a triphenyl phosphate compound of), a lithium secondary battery comprising the electrolyte and a method of manufacturing the same.

...화학식(1)

... Formula (1)

In Formula (1), R ₁ is oxide (O), alkyl oxide (RO), sulfide (S), alkyl sulfide (RS), methylene (CH ₂ ), succinic anhydride (C ₄ H ₄ O ₃ ) Any one selected from the group of

The alkyl group in R ₁ is any one alkyl group selected from the group of alkyl groups having 1 to 20 carbon atoms.

Recently, interest in energy storage technology is increasing. In the 2000s, the remarkable developments in the Information Technology (IT) industry were laptop computers, notebook computers, mobile phones, camcorders, MP3 (MPEG Audio Layer-3), and digital. Every day, not only cameras (digital carmera), but also advanced IT devices that combine their functions are being poured out.

As the energy source for enabling the operation of the IT devices, a battery is used to be suitable for portable use, and in particular, a secondary battery capable of charging and discharging is used, and a lithium secondary battery is used as such a secondary battery.

The IT devices are gradually becoming high performance by the demands of consumers, and the IT devices require more energy sources for the high performance. However, since the capacity of lithium secondary batteries, which are mainly used in IT devices, has not increased significantly, it is pointed out that the capacity of energy sources, especially lithium secondary batteries, must be solved for the growth of the IT industry. To this end, a great deal of research and investment has been focused on the development of high capacity electrode materials for lithium secondary batteries over the past decade.

Lithium secondary battery is largely composed of a positive electrode, a negative electrode, an electrolyte and an electrolyte membrane, and lithium ions from the positive electrode active material are intercalated into the negative electrode active material by charging, and lithium ions are deintercalatino from the negative electrode active material upon discharge. The method enables charge and discharge to store and release energy while reciprocating the anode and cathode electrodes.

Lithium cobalt oxide (LiCoO ₂ ), which is widely used in 4.2V class lithium secondary batteries, has a layered crystal structure, and thus lithium ions may be inserted into and removed from a negative electrode active material. Lithium cobalt oxide theoretically has a capacity of 280 mAh / g, but practically available capacity is about half of that, 140 mAh / g. The biggest cause of this is that when lithium ions are released more than half when the lithium ions are released in the layered crystal structure of the lithium cobalt oxide at a charge voltage of 4.2V or more, the amount of lithium ions in the layered crystal structure of the lithium cobalt oxide decreases. This is because deformation of the layered crystal structure of the oxide occurs (hexagonal → monoclinic). The capacity decreases as the layered crystal structure of lithium cobalt oxide decreases, and the reactivity between the active material and the electrolyte increases, resulting in degradation of the surface of the cathode and decomposition of the electrolyte. This is because it may be discharged to the outside to cause a problem of ignition and rupture of the battery.

On the other hand, when charging at a high voltage in a lithium secondary battery having such a non-aqueous electrolyte solution, there is a continuous demand for the development of a method for improving safety.

However, studies on lithium secondary batteries that can exhibit stability improvement, excellent energy density, and output density when charging lithium batteries at high voltage have been insignificant.

The present invention is to provide a lithium secondary battery electrolyte core, a lithium secondary battery comprising the electrolyte and a method for manufacturing a lithium secondary battery comprising the electrolyte that can improve the high voltage charge and discharge life characteristics.

The present inventors have completed the present invention by knowing that the triphenylphosphate compound of formula (1) is added to an electrolyte of a lithium battery, and when the electrolyte is applied to a lithium battery, the high voltage charge and discharge life characteristics of the lithium secondary battery are improved. .

...화학식(1)

... Formula (1)

In Formula (1), R ₁ is oxide (O), alkyl oxide (RO), sulfide (S), alkyl sulfide (RS), methylene (CH ₂ ), succinic anhydride (C ₄ H ₄ O ₃ ) Any one selected from the group of

The alkyl group in R ₁ of Formula (1) is any one alkyl group selected from the group of alkyl groups having 1 to 20 carbon atoms.

Accordingly, the present invention provides a lithium secondary battery comprising a lithium secondary battery electrolyte comprising the above formula (1) triphenyl phosphate compound, an electrolyte solution containing the above formula (1) triphenyl phosphate compound and the above formula (1) triphenyl phosphate An object of the present invention is to provide a method of manufacturing a lithium secondary battery including an electrolyte solution containing a compound.

The lithium secondary battery including the electrolyte solution containing the triphenyl phosphate compound of Chemical Formula 1 of the present invention may improve the high voltage charge / discharge life characteristics of the lithium secondary battery.

This invention shows the electrolyte solution for lithium secondary batteries containing a triphenyl phosphate compound.

This invention shows the electrolyte solution for lithium secondary batteries in the electrolyte solution for lithium secondary batteries containing the triphenyl phosphate compound of following General formula (1) in the electrolyte solution for lithium secondary batteries.

...화학식(1)

... Formula (1)

In Formula (1), R ₁ is oxide (O), alkyl oxide (RO), sulfide (S), alkyl sulfide (RS), methylene (CH ₂ ), succinic anhydride (C ₄ H ₄ O ₃ ) Is any one selected from the group of, and the alkyl group in R ₁ of the formula (1) is any one alkyl group selected from the group of alkyl groups having 1 to 20 carbon atoms.

The electrolyte solution for lithium secondary batteries of the present invention contains 0.1 to 10 parts by weight of the triphenyl phosphate compound of formula (1) based on 100 parts by weight of the electrolyte for lithium secondary batteries.

In the present invention, the electrolyte for a lithium secondary battery may use an electrolyte used in a conventional lithium secondary battery.

In the present invention, the lithium secondary battery electrolyte is a solution containing any one lithium salt selected from the group of lithium perchlorate, lithium hexafluorophosphate, lithium triplate, lithium bistrifluoromethylsulfonylamide and lithium tetrafluoroborate salt. Can be used. At this time, in the solution containing the lithium salt, the solution for dissolving the lithium salt may be used a solvent used in the preparation of the electrolyte solution for lithium secondary batteries. These solvents are ethylene carbonate (EC), propylene carbonate (PC), ethylmethyl carbonate (EMC), dimethylcarbonate (DMC), diethylecarbonate (DEC) and gamma Any one or more selected from the group of butyrolactone (γ-butyrolactone, GBL) can be used.

In the present invention, the electrolyte solution for a lithium secondary battery is 0.5 containing any one lithium salt selected from the group of lithium perchlorate, lithium hexafluorophosphate, lithium triflate, lithium bistrifluoromethylsulfonylamide and lithium tetrafluoroborate salt. A 1.0 M solution can be used. At this time, in the solution containing the lithium salt, the solution for dissolving the lithium salt may be used a solvent used in the preparation of the electrolyte solution for lithium secondary batteries. These solvents are ethylene carbonate (EC), propylene carbonate (PC), ethylmethyl carbonate (EMC), dimethylcarbonate (DMC), diethylecarbonate (DEC) and gamma Any one or more selected from the group of butyrolactone (γ-butyrolactone, GBL) can be used.

In the present invention, the triphenyl phosphate compound of the formula (1) can be used that is distributed in the market as a product. For example, 2- (triphenylphosphorenylidene) -succinic anhydride (2- (triphenylphosphoranylidene) suuccinic anhydride (Sigma-Aldrich, USA), Triphenylphosphine oxide (Triphenylphosphine) as a commercially available product oxide, Sigma-Aldrich, USA), triphenylphosphine sulfide (Sigma-Aldrich, USA) can be used any one selected from the group.

In the present invention, the triphenylphosphate compound of Formula (1) is Schmidbaur, Hubert; Stuehler, Herbert; Vornberger, Wolfgang. Organosilicon chemistry of phosphorus ylides. 15. Synthesis of pure triphenyl (methylene) phosphorane and its silyl derivatives. Chemische Berichte (1972), 105 (3)) may be used.

The present invention represents a lithium secondary battery.

The present invention relates to a lithium secondary battery comprising an electrolyte solution containing a triphenyl phosphate compound represented by the following general formula (1) in a lithium secondary battery.

...화학식(1)

... Formula (1)

In Formula (1), R ₁ is oxide (O), alkyl oxide (RO), sulfide (S), alkyl sulfide (RS), methylene (CH ₂ ), succinic anhydride (C ₄ H ₄ O ₃ ) It is any one selected from the group of, The alkyl group in R ₁ of the formula (1) is any one alkyl group selected from the group of alkyl group having 1 to 20 carbon atoms.

In the lithium secondary battery of the present invention, the electrolyte solution contains 0.1 to 10 parts by weight of the triphenyl phosphate compound of formula (1) based on 100 parts by weight of the electrolyte for lithium secondary batteries.

In the lithium secondary battery of the present invention, the electrolyte may be an electrolyte used in a conventional lithium secondary battery.

The electrolyte in the lithium secondary battery of the present invention is a solution containing any one lithium salt selected from the group of lithium perchlorate, lithium hexafluoro phosphate, lithium triplate, lithium bistrifluoromethylsulfonylamide and lithium tetrafluoroborate salt Can be used. At this time, in the solution containing the lithium salt, the solution for dissolving the lithium salt may be used a solvent used in the preparation of the electrolyte solution for lithium secondary batteries. These solvents are ethylene carbonate (EC), propylene carbonate (PC), ethylmethyl carbonate (EMC), dimethylcarbonate (DMC), diethylecarbonate (DEC) and gamma Any one or more selected from the group of butyrolactone (γ-butyrolactone, GBL) can be used.

In the lithium secondary battery of the present invention, the electrolyte solution is 0.5 containing any one lithium salt selected from the group of lithium perchlorate, lithium hexafluorophosphate, lithium triflate, lithium bistrifluoromethylsulfonylamide and lithium tetrafluoroborate salt. A 1.0 M solution can be used. At this time, in the solution containing the lithium salt, the solution for dissolving the lithium salt may be used a solvent used in the preparation of the electrolyte solution for lithium secondary batteries. These solvents are ethylene carbonate (EC), propylene carbonate (PC), ethylmethyl carbonate (EMC), dimethylcarbonate (DMC), diethylecarbonate (DEC) and gamma Any one or more selected from the group of butyrolactone (γ-butyrolactone, GBL) can be used.

In the present invention, the triphenyl phosphate compound of the formula (1) can be used that is distributed in the market as a product. For example, 2- (triphenylphosphorenylidene) -succinic anhydride (2- (triphenylphosphoranylidene) suuccinic anhydride (Sigma-Aldrich, USA), triphenylphosphine oxide (Triphenylphosphine) as a commercially available product on the market oxide, Sigma-Aldrich, USA), triphenylphosphine sulfide (Sigma-Aldrich, USA) can be used any one selected from the group.

In the lithium secondary battery of the present invention, the triphenylphosphate compound of formula (1) included in the electrolyte is Schmidbaur, Hubert; Stuehler, Herbert; Vornberger, Wolfgang. Organosilicon chemistry of phosphorus ylides. 15. Synthesis of pure triphenyl (methylene ) phosphorane and its silyl derivatives.The one prepared by Chemische Berichte (1972), 105 (3)) can be used.

The lithium secondary battery of the present invention includes a positive electrode, a negative electrode, and a separator in addition to the electrolyte solution containing the triphenyl phosphate compound of Formula (1) mentioned above.

The positive electrode of the positive electrode and / or negative electrode may be manufactured according to a conventional method known in the art, and for example, an electrode slurry including a positive electrode active material or a negative electrode active material is applied and dried on a current collector. Can be prepared. In this case, a small amount of a conductive agent and / or a binder may be optionally added.

The cathode active material contained in the cathode may be a conventional cathode active material that can be applied to the cathode of a conventional lithium secondary battery. Examples of such a cathode active material may use a lithium transition metal composite oxide such as LiM _x O _y (M = Co, Ni, Mn, Co _a Ni _b Mn _c ). Examples of the lithium transition metal composite oxide include lithium manganese composite oxide of LiMn ₂ O ₄ , lithium nickel oxide of LiNiO ₂ , lithium cobalt oxide of LiCoO ₂ , and a part of manganese, nickel, and cobalt of these lithium transition metal oxides as other transition metals. Substituted with may be used.

The negative electrode active material contained in the negative electrode may be a conventional negative electrode active material that can be applied to the negative electrode of a conventional lithium secondary battery. Examples of such an anode active material may be any one or more selected from the group of lithium occluding materials such as lithium metal, lithium alloy, carbon, petroleum coke, activated carbon, graphite, and other carbons. Can be.

Examples of the positive electrode current collector may be a foil made of aluminum, nickel, or a combination thereof. Examples of the negative electrode current collector may be a foil made of copper, gold, nickel, a copper alloy, or a combination thereof. Can be.

In the separator, a conventional separator applicable to a conventional lithium secondary battery may be used. The separator may be any one selected from the group consisting of olefin resins, fluorine resins, polyester resins or cellulose nonwoven fabrics, polymer separators and glass fibers.

The present invention includes a method of manufacturing a lithium secondary battery.

The method of manufacturing a lithium secondary battery of the present invention includes the steps of adding an electrolyte solution containing a triphenyl phosphate compound represented by the following formula (1) in the manufacture of a lithium secondary battery.

...화학식(1)

... Formula (1)

In Formula (1), R ₁ is oxide (O), alkyl oxide (RO), sulfide (S), alkyl sulfide (RS), methylene (CH ₂ ), succinic anhydride (C ₄ H ₄ O ₃ ) It is any one selected from the group of, The alkyl group in R ₁ of the formula (1) is any one alkyl group selected from the group of alkyl group having 1 to 20 carbon atoms.

The electrolyte of the lithium secondary battery of the present invention comprises 0.1 to 10 parts by weight of the triphenyl phosphate compound of formula (1) based on 100 parts by weight of the electrolyte for lithium secondary batteries.

In the lithium secondary battery of the present invention, the electrolyte may be an electrolyte used in a conventional lithium secondary battery.

The electrolyte solution of the lithium secondary battery of the present invention contains any one lithium salt selected from the group consisting of lithium perchlorate, lithium hexafluorophosphate, lithium triflate, lithium bistrifluoromethylsulfonylamide and lithium tetrafluoroborate salt. Solutions may be used. At this time, in the solution containing the lithium salt, the solution for dissolving the lithium salt may be used a solvent used in the preparation of the electrolyte solution for lithium secondary batteries. These solvents are ethylene carbonate (EC), propylene carbonate (PC), ethylmethyl carbonate (EMC), dimethylcarbonate (DMC), diethylecarbonate (DEC) and gamma Any one or more selected from the group of butyrolactone (γ-butyrolactone, GBL) can be used.

The electrolyte solution of the lithium secondary battery of the present invention contains any one lithium salt selected from the group consisting of lithium perchlorate, lithium hexafluorophosphate, lithium triflate, lithium bistrifluoromethylsulfonylamide and lithium tetrafluoroborate salt. 0.5-1.0 M solution can be used. At this time, in the solution containing the lithium salt, the solution for dissolving the lithium salt may be used a solvent used in the preparation of the electrolyte solution for lithium secondary batteries. These solvents are ethylene carbonate (EC), propylene carbonate (PC), ethylmethyl carbonate (EMC), dimethylcarbonate (DMC), diethylecarbonate (DEC) and gamma Any one or more selected from the group of butyrolactone (γ-butyrolactone, GBL) can be used.

In the present invention, the triphenyl phosphate compound of the formula (1) can be used that is distributed in the market as a product. For example, 2- (triphenylphosphorenylidene) -succinic anhydride (2- (triphenylphosphoranylidene) suuccinic anhydride (Sigma-Aldrich, USA), Triphenylphosphine oxide (Triphenylphosphine) as a commercially available product oxide, Sigma-Aldrich, USA), triphenylphosphine sulfide (Sigma-Aldrich, USA) can be used any one selected from the group.

The triphenylphosphate compound of formula (1) included in the electrolyte in the preparation of the lithium secondary battery of the present invention is known in the art (Schmidbaur, Hubert; Stuehler, Herbert; Vornberger, Wolfgang. Organosilicon chemistry of phosphorus ylides. 15. Synthesis of pure triphenyl (methylene) phosphorane and its silyl derivatives. Chemische Berichte (1972), 105 (3)) may be used.

The lithium secondary battery of the present invention can be prepared including a positive electrode, a negative electrode, a separator in addition to the electrolyte solution containing the triphenyl phosphate compound of formula (1).

Lithium secondary battery of the present invention can be prepared by inserting a separator between the positive electrode and the negative electrode and the electrolyte solution containing the triphenyl phosphate compound of the formula (1).

The separator may be a porous separator.

The positive electrode of the positive electrode and / or negative electrode may be prepared according to a conventional method known in the art, for example, an electrode slurry containing a positive electrode active material or a negative electrode active material on a current collector What has been applied and dried can be used as the anode and / or cathode. In this case, a small amount of a conductive agent and / or a binder may be optionally added.

The cathode active material contained in the cathode may be a conventional cathode active material that can be applied to the cathode of a conventional lithium secondary battery. Examples of such a cathode active material may use a lithium transition metal composite oxide such as LiM _x O _y (M = Co, Ni, Mn, Co _a Ni _b Mn _c ). Examples of the lithium transition metal composite oxide include lithium manganese composite oxide of LiMn ₂ O ₄ , lithium nickel oxide of LiNiO ₂ , lithium cobalt oxide of LiCoO ₂ , and a part of manganese, nickel, and cobalt of these lithium transition metal oxides as other transition metals. Substituted with may be used.

The negative electrode active material contained in the negative electrode may be a conventional negative electrode active material that can be applied to the negative electrode of a conventional lithium secondary battery. Examples of such an anode active material may be any one or more selected from the group of lithium occluding materials such as lithium metal, lithium alloy, carbon, petroleum coke, activated carbon, graphite, and other carbons. Can be.

Examples of the positive electrode current collector may be a foil made of aluminum, nickel, or a combination thereof. Examples of the negative electrode current collector may be a foil made of copper, gold, nickel, a copper alloy, or a combination thereof. Can be.

In the separator, a conventional separator applicable to a conventional lithium secondary battery may be used. The separator may be any one selected from the group consisting of olefin resins, fluorine resins, polyester resins or cellulose nonwoven fabrics, polymer separators and glass fibers.

In order to obtain a lithium secondary battery meeting the object of the present invention, the lithium secondary battery electrolyte containing the triphenyl phosphate compound of the general formula (1) of the present invention, a lithium secondary battery containing the electrolyte and a manufacturing method thereof were investigated. When manufacturing a lithium secondary battery, it is preferable to use the electrolyte solution for lithium secondary batteries containing the triphenyl phosphate compound of Formula (1) mentioned above.

Hereinafter, the present invention will be described in detail with reference to Examples and Test Examples. However, these are intended to explain the present invention in more detail, and the scope of the present invention is not limited thereto.

≪ Example 1 >

1-1. Manufacture of electrolyte

1 M LiPF ₆ was added to the mixed solution at a volume ratio of EC (ethylene carbonate): EMC (ethyl methyl carbonate) = 1: 1 to obtain an electrolyte solution.

3 parts by weight of the triphenyl phosphate compound of Formula (1) was added to 100 parts by weight of the electrolyte to prepare an electrolyte for a lithium secondary battery.

...화학식(1)

... Formula (1)

As the triphenylphosphate compound of Formula (1), triphenylphosphine oxide (Triphenylphosphine oxide, Sigma-Aldrich, USA) in which R ₁ is oxide (O) was used.

1-2. Full cell manufacturing

LiCoO ₂ is added to the coin cell case Place the separator on the single-coated anode, stack the cathode coated with MCMB (Mesocarbon Microbeads) again, position it so that both the anode and the cathode are coated toward the polypropylene separator, and inject the electrolyte to cover the cap. By a method to produce a full-cell (coin) -type full cell lithium secondary battery.

In the above electrolyte, a lithium secondary battery electrolyte containing the compound of formula (1) triphenylphosphate prepared in 1-1 was used.

<Example 2>

The triphenylphosphate compound of formula (1) added to the electrolyte in Example 1-1 was used except that triphenylphosphine sulfide (Sigma-Aldrich, USA) in which R ₁ is sulfide (S) was used. By the same method as in Example 1-2, a lithium secondary battery was prepared.

<Example 3>

Formula (1) triphenylphosphate compound added to the electrolyte in Example 1-1 was prepared in the same manner as in Example 1-2, except that R ₁ is methylene (CH ₂ ) to produce a lithium _secondary battery It was.

Wherein the triphenylphosphate compound of formula (1) wherein R ₁ is methylene (CH ₂ ) is Schmidbaur, Hubert; Stuehler, Herbert; Vornberger, Wolfgang.Organosilicon chemistry of phosphorus ylides. 15. Synthesis of pure triphenyl (methylene) phosphorane and its silyl derivatives, prepared by Chemische Berichte (1972), 105 (3)).

<Example 4>

The triphenylphosphate compound of formula (1) added to the electrolyte in Example 1-1 is a 2- (triphenylphosphorenylidene) -succinic compound wherein R ₁ is succinic anhydride (C ₄ H ₄ O ₃ ). A lithium secondary battery was manufactured by the same method as Example 1-2, except for using hydride (2- (triphenylphosphoranylidene) suuccinic anhydride, Sigma-Aldrich, USA).

Comparative Example 1

A lithium secondary battery was manufactured in the same manner as in Example 1-2, except that the compound of Formula (1) triphenylphosphate was not added to the electrolyte in Example 1-1.

Experimental Example Performance Evaluation of a Lithium Secondary Battery

In order to evaluate the performance of the lithium secondary battery including the electrolyte solution containing the triphenyl phosphate compound of the formula (1) of the present invention, the following experiment was performed.

The lithium secondary batteries of Examples 1, 2, 3, and 4 prepared using the tripetylphosphate compound of Formula (1) were used, and as a control, the lithium secondary battery of Formula (1) The lithium secondary battery of Comparative Example 1 prepared using an electrolyte solution containing no tripetyl phosphate compound was used.

Each battery was charged to 4.4 V with a charging current of 0.5 C to obtain a charging capacity, and 0.5 C discharge was performed to 3 V to obtain a discharge capacity. The results are shown in FIG. 1.

1 is a graph showing the cycle characteristics of each lithium secondary battery prepared in Example 1, Example 2, Example 3, Example 4 and Comparative Example 1.

As shown in the results of FIG. 1, a lithium secondary battery of Examples 1, 2, 3, and 4, which contains an electrolyte solution containing a trifetylphosphate compound of formula (1) of the present invention, is a tree of formula (1). It was found that the discharge capacity was better after charging to 4.4V with a charging current of 0.5C as compared to Comparative Example 1 lithium secondary battery including an electrolyte solution containing no petylphosphate compound.

As described above, although described with reference to a preferred embodiment of the present invention, those skilled in the art will be variously modified and modified within the scope of the present invention without departing from the spirit and scope of the invention described in the claims below. It will be appreciated that it can be changed.

The lithium secondary battery including the electrolyte solution containing the tripetyl phosphate compound of formula (1) of the present invention has excellent life characteristics during high voltage charge / discharge driving, and thus is preferable for improving the energy density and high output of the lithium secondary battery. Can contribute to improvement.

On the other hand, the present invention can be used as a conventional lithium secondary battery manufacturing process as it is suitable for commercialization of lithium secondary battery manufacturing excellent life characteristics during high voltage charge and discharge driving.

1 is a graph showing the cycle characteristics (@ R.T., 0.5C) of each lithium secondary battery manufactured in Example 1, Example 2, Example 3, Example 4 and Comparative Example 1.

Claims (9)

In the electrolyte solution for lithium secondary batteries, The electrolyte solution for lithium secondary batteries containing the triphenyl phosphate compound of following General formula (1) in the electrolyte solution for lithium secondary batteries.

... Formula (1) In Formula (1), R ₁ is succinic anhydride (C ₄ H ₄ O ₃ ). The electrolyte solution for lithium secondary batteries according to claim 1, comprising 0.1 to 10 parts by weight of the triphenyl phosphate compound of the formula (1) based on 100 parts by weight of the lithium secondary battery electrolyte. The method of claim 1, wherein the electrolyte for a lithium secondary battery contains any one lithium salt selected from the group of lithium perchlorate, lithium hexafluoro phosphate, lithium triplate, lithium bistrifluoromethylsulfonylamide and lithium tetrafluoroborate salt The electrolyte solution for lithium secondary batteries containing the triphenyl phosphate compound characterized by the above-mentioned 0.5-1.0M solution. In a lithium secondary battery, A lithium secondary battery comprising an electrolyte solution containing a triphenyl phosphate compound of the formula (1).

... Formula (1) In Formula (1), R ₁ is succinic anhydride (C ₄ H ₄ O ₃ ). The lithium secondary battery according to claim 4, wherein the electrolyte contains 0.1 to 10 parts by weight of the triphenyl phosphate compound of formula (1) based on 100 parts by weight of the electrolyte for lithium secondary batteries. The electrolyte solution for a lithium secondary battery according to claim 5, wherein any one lithium salt is selected from the group consisting of lithium perchlorate, lithium hexafluorophosphate, lithium triflate, lithium bistrifluoromethylsulfonylamide and lithium tetrafluoroborate salt. Lithium secondary battery, characterized in that 0.5 to 1.0M solution. In the manufacture of a lithium secondary battery, Method for producing a lithium secondary battery comprising the step of adding an electrolyte solution containing a triphenyl phosphate compound of the formula (1).

... Formula (1) In Formula (1), R ₁ is succinic anhydride (C ₄ H ₄ O ₃ ). The method for manufacturing a lithium secondary battery according to claim 7, wherein the electrolyte contains 0.1 to 10 parts by weight of the triphenyl phosphate compound of the formula (1) based on 100 parts by weight of the electrolyte for a lithium secondary battery. The electrolyte solution for a lithium secondary battery according to claim 7, wherein any one lithium salt is selected from the group of lithium perchlorate, lithium hexafluorophosphate, lithium triplate, lithium bistrifluoromethylsulfonylamide and lithium tetrafluoroborate salt. Method for producing a lithium secondary battery, characterized in that 0.5 to 1.0M solution.

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