KR20170046995A - Ionic polyhedral oligomeric silsesquioxane, electrolyte composition for secondary battery including the same, polymer electrolyte for secondary battery and method of manufacturing the same - Google Patents

Abstract

The present invention provides an ionic polyhedral oligomeric silsesquioxane comprising an ionic crosslinking functional group, to an electrolyte composition for a secondary battery comprising the same, to a polymer electrolyte for a secondary battery, and to a production method thereof.

Description

TECHNICAL FIELD [0001] The present invention relates to an ionic basket-type silsesquioxane, an electrolyte composition for a secondary battery comprising the ionic basket-type silsesquioxane, a polymer electrolyte for a secondary battery, and a method for manufacturing the same. BACKGROUND ART IONIC POLYHEDRAL OLIGOMERIC SILSESQUIOXANE, ELECTROLYTE COMPOSITION FOR SECONDARY BATTERY INCLUDING THE SAME, POLYMER ELECTROLYTE SECONDARY BATTERY AND METHOD OF MANUFACTURING THE SAME}

The present invention relates to an ionic basket silsesquioxane having an ionic crosslinking functional group and an electrolyte composition for a secondary battery comprising the same. The present invention also relates to a polymer electrolyte for a secondary battery comprising the polymer crosslinked by the ionic crosslinking functional group and a method for producing the polymer electrolyte.

Since Sony developed the first commercial lithium rechargeable battery in 1991, the importance and demand for lithium-ion rechargeable batteries is rapidly increasing. Lithium-ion batteries are rechargeable / rechargeable rechargeable batteries that are light in weight and are useful for making high-capacity batteries and are being used as large-capacity storage devices for portable energy-saving portable electronic devices. The electrolyte of the lithium ion battery is composed of a lithium salt and a carbonate-based organic solvent capable of dissociating it, and exhibits high ion conductivity, but has disadvantages such as leakage and explosion possibility of an electrolyte when implementing an electronic device. Polymer electrolytes are attracting attention as a solution to these problems. The polymer electrolyte can be prepared by crosslinking a compound having a crosslinkable functional group mixed with a commercial liquid electrolyte or an ionic liquid, and the crosslinked polymer serves as a support for a liquid electrolyte or an ionic liquid.

Recently, a crosslinked polymer electrolyte using an organic polycarbonate having a cyclic carbonate structure has been introduced, but it has a problem of requiring a very high polymer content [Kozo et al., Journal of Polymer Science Part A: Polymer Chemistry, 50, (2012) 5161 -5169]. In addition, in the organic crosslinked epoxy polymer electrolyte using the recently introduced epoxy-based reactive monomer, a high content of polymer is required for gel formation, and an amine-based polymer serving as a catalyst for the crosslinking reaction for cross- [Korean Patent Application 10-2010-0118779]. Polymer electrolytes which require high polymer content have problems of deterioration of ionic conductivity and electrical properties due to excessive content of polymer. In addition, organic polymers have limitations in terms of mechanical strength and heat resistance, which are disadvantages of organic systems.

Recently, a low molecular weight, mono-molecular cyclic siloxane-based hybrid organic electrolyte has been reported to overcome the disadvantages of organic polymers [Kim et al., Journal of Power Sources 178 (2008) 837-841]. Although a crosslinked gel polymer electrolyte is realized using an acrylic side chain in a low molecular weight monomolecular cyclic siloxane main chain, it has a problem that a high content is required and a monomolecular cyclic siloxane structure is poor in mechanical strength and heat resistance, and film formability is poor there was.

The ionic basket silsesquioxane according to one embodiment of the present invention contains an ionic crosslinking functional group and is crosslinked by the ionic crosslinking functional group after being mixed with the ionic liquid electrolyte, And to provide a polymer electrolyte for a secondary battery and a method of manufacturing the same.

The ionic polyhedral oligomeric silsesquioxane (POSS) according to one embodiment of the present invention can be represented by the following formula (1).

[Chemical Formula 1]

In Formula 1, at least one of R ₁ to R ₈ may include an ionic crosslinking functional group.

For example, at least one of R ₁ to R ₈ in Formula 1 may be any one selected from the group consisting of imidazolium, pyridinium, and trialkyl ammonium. .

For example, at least one of R ₁ to R ₈ in Formula 1 is a vinyl group, an allyl group, an acryloyl group, a methacryloyl group, and an epoxy group. group) may be included.

For example, at least one of R ₁ to R ₈ in Formula 1 may be any one selected from the group consisting of functional groups represented by Formula 2 below.

(2)

In Formula 2, at least one of X ₁ to X ₅ is a vinyl group, an allyl group, an acryloyl group, a methacryloyl group, and an epoxy group. And the like.

The electrolyte composition for a secondary battery according to an embodiment of the present invention comprises the ionic basket type silsesquioxane; And an ionic liquid electrolyte.

In one example, the ionic liquid electrolyte may include a lithium salt and an ionic liquid.

As an example, it may further include an initiator.

In one example, the initiator may be a thermal initiator or a photoinitiator.

The polymer electrolyte for a secondary battery according to an embodiment of the present invention comprises a polymer crosslinked by the ionic crosslinking functional group of the ionic basket silsesquioxane; And an ionic liquid electrolyte.

In one example, the ionic liquid electrolyte may include a lithium salt and an ionic liquid.

The method for preparing a polymer electrolyte for a secondary battery according to an embodiment of the present invention comprises: mixing the ionic basket type silsesquioxane and an ionic liquid electrolyte; And crosslinking the ionic crosslinking functional group of the ionic basket-like silsesquioxane.

As an example, in the mixing step, an initiator may further be included.

In one example, the initiator is a thermal initiator, and crosslinking of the ionic basket silsesquioxane may be performed by thermal polymerization.

In one example, the initiator is a photoinitiator, and crosslinking of the ionic basket silsesquioxane may be performed by photopolymerization.

The ionic basket silsesquioxane according to an embodiment of the present invention may be prepared by introducing one or more ionic crosslinking functional groups into the side chain and converting the ionic basket silsesquioxane to a low crosslinking agent content It is possible to provide a polymer electrolyte for a secondary battery having a low molecular weight polymer and excellent physical properties such as crosslinking property, heat resistance, mechanical strength, processability and ion conductivity.

The various and advantageous advantages and effects of the present invention are not limited to the above description, and can be more easily understood in the course of describing a specific embodiment of the present invention.

1 is a schematic view illustrating a process for producing an ionic basket-like silsesquioxane according to an embodiment of the present invention.
2 shows the ¹ H NMR analysis results of the ionic basket type silsesquioxane according to one embodiment of the present invention.
3 shows the results of ¹³ C NMR analysis of an ionic basket-like silsesquioxane according to an embodiment of the present invention.
4 shows the results of ²⁹ Si NMR analysis of the ionic basket type silsesquioxane according to one embodiment of the present invention.
5 shows FTIR analysis results of the ionic basket type silsesquioxane according to one embodiment of the present invention.
6 shows the temperature dependence of the ionic conductivity of the ionic basket silsesquioxane according to an embodiment of the present invention.
7 shows an electrochemical stability analysis result of the ionic basket type silsesquioxane according to one embodiment of the present invention.
FIG. 8 shows the results of analysis of the rheological behavior of a polymer electrolyte for a secondary battery according to an embodiment of the present invention.

Hereinafter, the present invention will be described in detail. The embodiments of the present invention can be modified into various other forms, and the scope of the present invention is not limited to the embodiments described below.

In the present invention, the term "aliphatic" is defined as meaning a functional group having no aromaticity, a compound or the like as a relative concept to an aromatic group.

In the present invention, the 'alkyl group' is a branched or branched alkyl group having 1 to 30 carbon atoms such as a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, an isobutyl group or a t- And a cycloalkyl group having 3 to 10 carbon atoms such as a pentyl group and a cyclohexyl group.

In the present invention, the 'allyl group' is a functional group represented by H ₂ C═CH-CH ₂ -.

In the present invention, 'vinyl group' is a functional group represented by CH ₂ = CH-.

In the present invention, the 'acrylate group' is a functional group represented by CH ₂ ═CH-C (═O) -.

In the present invention, a 'methacryloyl group' is a functional group represented by CH ₂ ═C (CH ₃ ) -C (═O) -.

The ionic polyhedral oligomeric silsesquioxane (POSS) according to an embodiment of the present invention can be represented by the following formula (1).

[Chemical Formula 1]

In Formula 1, at least one of R ₁ to R ₈ includes an ionic crosslinking functional group.

Specifically, in Formula 1, at least one of R ₁ to R ₈ includes any one cation selected from the group consisting of imidazolium, pyridinium, and trialkyl ammonium . The cation can be dissolved and crosslinked in the ionic liquid silsesquioxane ionic liquid electrolyte to form a polymer electrolyte for a secondary battery and to provide a high ionic conductivity.

In Formula 1, at least one of R ₁ to R ₈ is a vinyl group, an allyl group, an acryloyl group, a methacryloyl group, and an epoxy group ) May be included. The functional groups include at least one crosslinkable functional group such that the functional groups are crosslinked with each other, so that the ionic basket-like silsesquioxane forms a crosslinked polymer.

More specifically, at least one of R ₁ to R ₈ in Formula 1 may be any one selected from the group consisting of functional groups represented by Formula 2 below.

(2)

In Formula 2, at least one of X ₁ to X ₅ is a vinyl group, an allyl group, an acryloyl group, a methacryloyl group, and an epoxy group. And the like.

For example, the ionic basket silsesquioxane can be prepared by the following process:

(3-chloropropyl) trimethoxysilane was reacted in a hydrochloric acid / methanol solvent at room temperature for 2 days to obtain octa (3-chloropropyl) POSS (3-chloropropyl) ).

(b) 40 to 40% by weight of imidazole, pyridine, pyrimidine or a tertiary amine containing a crosslinking functional group and octamer (3-chloropropyl) POSS as a solvent in dimethylformamide Lt; 0 > C for 48 hours to obtain POSS represented by the following formula (3).

(3)

In Formula 3, at least one of R ₁ to R ₈ is 1-propyl-3-vinylimidazolium chloride, 1-propyl-4-vinylpyridinium chloride (4- vinylpyridinium chloride, 4-vinylpyrimidinium chloride or propyl triallyl ammonium chloride.

(c) reacting a lithium salt represented by POSS and LiN (C _p F _{2p + 1} SO ₂ ) (C _q F _{2q + 1} SO ₂ ) (wherein p and q are natural numbers) POSS represented by the following formula (4) is obtained.

[Chemical Formula 4]

Wherein at least one of R ₁ to R ₈ is 1-propyl-3-vinylimidazoliumbis (fluoroalkylsulfonyl) imide) (1-propyl-3-vinylimidazolium bis (fluoroalkylsulfonyl) imide) (1-propyl-4-vinylpyridinium bis (fluoroalkylsulfonyl) imide), 1-propyl-4-vinylpyrimidinium bis (1-propyl-4-vinylpyrimidinium bis (fluoroalkylsulfonyl) imide)) or propyltriallylammonium bis (fluoroalkylsulfonyl) imide) .

1 is a schematic diagram depicting the synthesis process of (a) to (c).

For example, the ionic basket-like silsesquioxane prepared through the processes (a) to (c) may be any one selected from the group consisting of compounds represented by the following formulas (5) to (7)

[Chemical Formula 5]

[Chemical Formula 6]

(7)

The electrolyte composition for a secondary battery according to an embodiment of the present invention may include an ionic basket silsesquioxane obtained by the above production method and an ionic liquid electrolyte.

The ionic liquid electrolyte may comprise a lithium salt and an ionic liquid. The lithium salt is a quaternary amine-based one comprising LiPF ₄ , LiBF ₄ and LiN (C _p F _{2p + 1} SO ₂ ) (C _q F _{2q + 1} SO ₂ ) (where p and q are natural numbers) Lt; RTI ID = 0.0 > and / or < / RTI >

The ionic liquid may be selected from the group consisting of i) ammonium, imidazolium, oxazolium, piperidinium, pyrazinium, pyrazolium, pyridazinium, ), Pyridinium, pyrimidinium, pyrrolidinium, pyrrolinium, thriazolium, triazolium and guanidinium, which are optionally substituted with one or more substituents selected from the group consisting of pyridinium, pyrimidinium, pyrimidinium, pyrrolidinium, pyrrolinium, And ii) anions selected from the group consisting of halogens, sulfates, sulfonates, amides, imides, borates, phosphates, antimonates, decanates and cobalt tetra-carbonyls .

The ionic crosslinking functional groups of the ionic basket type silsesquioxane included in the electrolyte composition for a secondary battery according to an embodiment of the present invention may be crosslinked with each other to form a polymer. By forming the polymer, the composition can be a polymer electrolyte for a secondary battery. The crosslinked polymer exhibits good mechanical properties due to the crosslinked cage structure while improving the ion conductivity of the polymer electrolyte due to crystallinity.

The electrolyte composition for a secondary battery according to an embodiment of the present invention may further include an initiator. The initiator may be a thermal initiator or photoinitiator depending on the crosslinking method of the ionic basket silsesquioxane.

In the case of crosslinking the ionic basket silsesquioxane by thermal polymerization, a thermal initiator can be used, and in the case of crosslinking the ionic basket silsesquioxane by photopolymerization, a photoinitiator can be used.

The content of the ionic basket silsesquioxane according to one embodiment of the present invention may be 0.1 to 3% by weight based on the total weight of the electrolyte composition. In the electrolyte composition for a secondary battery using a conventional organic polymer, an initiator of about 10 wt% based on the total weight of the total electrolyte composition was used. However, the electrolyte composition for a secondary battery according to an embodiment of the present invention is characterized in that a silsesquioxane- It is possible to produce a polymer electrolyte excellent in mechanical properties and ion conductivity even when a relatively small amount of ionic basket silsesquioxane is used as compared with a composition using a conventional organic polymer.

The polymer electrolyte for a secondary battery according to an embodiment of the present invention may include a polymer crosslinked by an ionic crosslinking functional group of an ionic basket silsesquioxane and an ionic liquid electrolyte according to an embodiment of the present invention. The ionic liquid electrolyte may include a lithium salt and an ionic liquid, and the same materials as those used in the electrolyte composition for a secondary battery according to an embodiment of the present invention may be used.

According to an embodiment of the present invention, there is provided a method of manufacturing a polymer electrolyte for a secondary battery, comprising: forming an electrolyte composition for a secondary battery by mixing an ionic basket silsesquioxane and an ionic liquid electrolyte according to an embodiment of the present invention; And crosslinking the ionic crosslinking functional group of the ionic basket-like silsesquioxane according to an embodiment of the present invention.

In the step of forming the electrolyte composition for a secondary battery, an initiator may be further included to form the composition.

When the initiator is a thermal initiator, crosslinking of the ionic basket-like silsesquioxane according to an embodiment of the present invention can be performed by theramyl polymerization, and when the initiator is a photoinitiator, Crosslinking of the ionic basket silsesquioxane according to one embodiment of the present invention can be performed by photopolymerization.

The content of the initiator may be 0.1 to 3 wt% based on the total weight of the ionic basket-like silsesquioxane according to one embodiment of the present invention.

Hereinafter, the present invention will be described in more detail with reference to Examples. It is to be understood by those skilled in the art that these embodiments are only for describing the present invention in more detail and that the scope of the present invention is not limited by these embodiments in accordance with the gist of the present invention .

≪ Example 1 >

Synthesis of imidazoli-based silsesquioxane in ionic baskets

(a) First, 150 ml of methanol and 5 ml of hydrochloric acid were prepared, 15 g of (3-chloropropyl) trimethoxysilane was added, and the mixture was stirred at room temperature for 2 hours. Next, 0.15 g of a di- n- butyltin dilaurate catalyst was added, followed by stirring at room temperature for 48 hours. After filtering the white powder, the basket-like chloropropyl silsesquioxane was obtained (3.68 g, 38% yield).

(b) 1 g of the basket-type chloropropyl silsesquioxane was dissolved in 10 ml of DMF solvent, and then 0.52 g of vinyl imidazole was added, followed by stirring at 40 ° C for 48 hours. After reacting for 48 hours, the mixture was precipitated in 100 ml of acetone to obtain an ionic basket imidazolium silsesquioxane (0.7 g, 88% yield)

(c) 1 g of ionic basket imidazolium silsesquioxane was dissolved in 15 ml of water by anion exchange reaction. Then, a solution of lithium bis (trifluoromethylsulfonyl) amine 1.45 g dissolved in water 10 ml was added, The anion of the ionic basket imidazolium silsesquioxane was replaced with bis (trifluoromethylsulfonyl) imide (TFSI) by filtration.

FIG. 2 shows the ¹ H NMR analysis results of Example 1, FIG. 3 shows the ¹³ C NMR analysis results of Example 1, FIG. 4 shows the ²⁹ Si NMR analysis results of Example 1, 1 < / RTI >

Referring to the results of FIG. 2 to FIG. 5, it can be seen that the ionic basket imidazolium silsesquioxane was synthesized.

≪ Example 2 >

Synthesis of ionic basket type pyridinium-based silsesquioxane

(a) In the same manner as in the step (a) of Example 1, the basket-type chloropropyl silsesquioxane was obtained.

(b) 1 g of the basket-type chloropropyl silsesquioxane was dissolved in 10 ml of DMF solvent, and then 0.52 g of vinyl pyridine was added, followed by stirring at 40 ° C for 48 hours. After reacting for 48 hours, the mixture was precipitated in 100 ml of acetone to obtain an ionic basket-type pyridinium-based silsesquioxane (0.7 g, 88% yield)

(c) 1 g of ionic basket-type pyridinium-based silsesquioxane was dissolved in 15 ml of water by anion exchange reaction, and then dissolved in 1.45 g of lithium bis (trifluoromethylsulfonyl) amine dissolved in 10 ml of water. , The anion of the ionic basket-type pyridinium-based silsesquioxane was exchanged with bis (trifluoromethylsulfonyl) imide (TFSI).

≪ Example 3 >

Synthesis of ionic basket type trimethylammonium silsesquioxane

(a) In the same manner as in the step (a) of Example 1, the basket-type chloropropyl silsesquioxane was obtained.

(b) 1 g of the basket-type chloropropyl silsesquioxane was dissolved in 10 ml of DMF solvent, and then 0.52 g of trimethylamine was added, followed by stirring at 40 ° C for 48 hours. After reacting for 48 hours, the mixture was precipitated in 100 ml of acetone to obtain an ionic basket type trimethylammonium silsesquioxane (0.7 g, 88% yield)

(c) 1 g of ion-exchanged trimethylammonium silsesquioxane was dissolved in 15 ml of water by anion exchange reaction. Then, a solution of lithium bis (trifluoromethylsulfonyl) amine (1.45 g) dissolved in water (10 ml) was added and precipitated and filtered The anion of the ionic basket type trimethylammonium silsesquioxane was exchanged with bis (trifluoromethylsulfonyl) imide (TFSI).

<Example 4>

Thermal initiator  Used ionic Basket type Imidazoli Silsesquioxane  Preparation of Polymer Electrolyte

The ionic basket imidazolium silsesquioxane of Example 1 was added dropwise to the ionic liquid electrolyte (1 M LiTFSI in N-butyl-N-methyl pyrrolidinium bis (trifluoromethylsulfonyl) imide) Followed by stirring.

Then, azobisisobutyronitrile (AIBN), which is a thermal initiator, was dissolved in an amount of 1 wt% based on the total weight of the ionic basket imidazolium-based silsesquioxane. Next, the reaction was carried out at 70 캜 for 3 hours to prepare a leak-free polymer electrolyte.

&Lt; Example 5 >

Photoinitiator  Used Ionic basket type Imidazoli Silsesquioxane  Preparation of Polymer Electrolyte

Example 1 was repeated except that Ciba ^® Igracure ^® 184 was used as a photoinitiator in place of the thermal initiator in Example 4, and the ionic basket imidazolium silsesquioxane was crosslinked by irradiating ultraviolet rays at 3 J / cm 2 intensity. The polymer electrolyte was prepared in the same manner.

&Lt; Evaluation Example 1 &

Evaluation of ionic conductivity of polymer electrolyte

The polymer electrolyte prepared by the method described in Example 4, 2% by weight of ionic basket type silsesquioxane of Example 1 (ionic POSS), 5% by weight of the ionic basket silsesquioxane of Example 1, Temperature dependent ionic conductivity was measured for each of the polymer electrolyte prepared by the method described in Example 4 and the ionic liquid electrolyte alone through an AC impedance test. For the evaluation, a symmetric blocking electrode made of SUS 316 without reactivity with electrolyte was prepared. Ion conductivity from 20 ℃ to 80 ℃ was measured in the range of 1 MHz ~ 1 mHz using 10 mV of alternating current.

6 shows the result of the temperature dependence analysis of the ionic conductivity.

Referring to FIG. 6, it can be seen that the polymer electrolyte prepared using the ionic basket silsesquioxane of Example 1 exhibits an ion conductivity of 0.5 mS / cm at room temperature.

 &Lt; Evaluation Example 2 &

Evaluation of Electrochemical Stability of Polymer Electrolyte

Except that 5 wt% of ionic basket type silsesquioxane (ionic POSS) of Example 1 was added to prepare a polymer electrolyte prepared by the method described in Example 4 and an ionic liquid electrolyte containing no ionic basket silsesquioxane The electrochemical stability of the polymer electrolyte prepared by the method described in Example 4 was evaluated. SUS was used as the working electrode for evaluation, and lithium metal was used as the counter electrode and the reference electrode. Cells were fabricated to make the electrolyte contact each electrode and the scan rate was fixed at 1 mV / s.

FIG. 7 shows the electrochemical stability analysis results of the polymer electrolyte.

Referring to FIG. 7, no oxidation current was observed until the potential change was 4.5 V versus Li / Li ⁺ , and it was confirmed that the oxidation current due to the oxidation reaction of the polymer electrolyte was observed in the section exceeding 4.5 V . Therefore, it can be confirmed that the polymer electrolyte prepared according to one embodiment of the present invention is electrochemically stable up to 4.5 V compared to Li / Li ⁺ , and thus has sufficient stability for application to a lithium ion polymer battery.

&Lt; Evaluation Example 3 &

Evaluation of Mechanical Properties of Polymer Electrolytes

i) the polymer electrolyte prepared by the method described in Example 4 by adding 2% by weight of ionic basket type silsesquioxane (ionic POSS) of Example 1, ii) the ionic basket- 10% by weight of ionic basket type silsesquioxane (ionic POSS) of Example 1 was added to the polymer electrolyte prepared by the method described in Example 4 by adding 5 wt% For each polymer electrolyte prepared by the method, the frequency - dependent complex elastic modulus was measured by a rheological test. For the evaluation, rheological properties were measured using a circular plate of 25 mm diameter in the linear viscoelastic region.

8 is the result of analysis of the rheological behavior of the polymer electrolyte of i) to iii).

Referring to FIG. 8, it can be seen that the composite elasticity of the polymer electrolyte is not dependent on the frequency and the dynamic elastic modulus (G ') is larger than the loss elastic modulus (G``) as a result of the crosslinking reaction of ionic baskets of silsesquioxane Value is displayed. It was also confirmed that the composite elastic modulus increased with the content of ionic basket silsesquioxane. Therefore, it can be confirmed that the polymer electrolyte prepared according to one embodiment of the present invention has a three-dimensional net structure and is mechanically stable, and the mechanical properties can be controlled according to the content of the ionic basket silsesquioxane.

Claims (14)

An ionic polyhedral oligomeric silsesquioxane represented by the following formula (1).
[Chemical Formula 1]

In Formula 1, at least one of R ₁ to R ₈ includes an ionic crosslinking functional group. The method according to claim 1,
In Formula 1, at least one of R ₁ to R ₈ includes any one of a cation selected from the group consisting of imidazolium, pyridinium, and trialkyl ammonium An ionic basket-like silsesquioxane. The method according to claim 1,
In Formula 1, at least one of R ₁ to R ₈ is a vinyl group, an allyl group, an acryloyl group, a methacryloyl group, and an epoxy group. Wherein the ionic basket-like silsesquioxane comprises at least one functional group selected from the group consisting of: The method according to claim 1,
Wherein at least one of R ₁ to R ₈ in Formula 1 is any one selected from the group consisting of functional groups represented by Formula 2 below.
(2)

In Formula 2, at least one of X ₁ to X ₅ is a vinyl group, an allyl group, an acryloyl group, a methacryloyl group, and an epoxy group. &Lt; / RTI &gt; An ionic basket-like silsesquioxane as claimed in any one of claims 1 to 4; And
An ionic liquid electrolyte; and an electrolytic solution for a secondary battery. Wherein the ionic liquid electrolyte comprises a lithium salt and an ionic liquid. 6. The method of claim 5,
The electrolyte composition for a secondary battery according to claim 1, further comprising an initiator. 8. The method of claim 7,
Wherein the initiator is a thermal initiator or a photoinitiator. A polymer crosslinked by the ionic crosslinking functional group of the ionic basket silsesquioxane of any one of claims 1 to 4; And
And an ionic liquid electrolyte. 10. The method of claim 9,
Wherein the ionic liquid electrolyte comprises a lithium salt and an ionic liquid. Mixing an ionic basket silsesquioxane and an ionic liquid electrolyte according to any one of claims 1 to 4 to form an electrolyte composition for a secondary battery; And
And crosslinking the ionic crosslinking functional group of the ionic basket-like silsesquioxane. 12. The method of claim 11,
The method for producing a polymer electrolyte for a secondary battery according to claim 1, further comprising an initiator in the step of forming the electrolyte composition for a secondary battery. 13. The method of claim 12,
Wherein the initiator is a thermal initiator and crosslinking the ionic basket silsesquioxane is performed by thermal polymerization. 13. The method of claim 12,
Wherein the initiator is a photoinitiator and the cross-linking of the ionic basket-like silsesquioxane is performed by photopolymerization.

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