High-conductivity polymer solid electrolyte as well as preparation method and application thereof
By preparing a high-conductivity polymer solid electrolyte and constructing ion transport channels through pre-aging, electrochemical pre-polarization, in-situ pre-crosslinking, and complete crosslinking processes, the problem of low ionic conductivity of polymer solid electrolytes was solved, and the battery performance was improved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- KUNMING UNIV OF SCI & TECH
- Filing Date
- 2026-01-23
- Publication Date
- 2026-04-17
AI Technical Summary
Existing polymer solid electrolytes have low ionic conductivity, which limits their application in high-performance batteries.
A high-conductivity polymer solid electrolyte was prepared by combining polymer monomers, monofunctional organic compounds, alkali metal salts and photoinducers through pre-aging, electrochemical pre-polarization and in-situ pre-crosslinking and complete crosslinking processes. Ultraviolet light was used to crosslink the electrolyte to form a gel precursor and construct ion transport channels, thereby reducing crystallinity and crosslinking density.
It significantly improves the ionic conductivity and electrochemical stability of polymer solid electrolytes, enhancing battery performance, especially in sodium-based batteries.
Smart Images
Figure CN121885753A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of solid-state battery technology, and in particular to a high-conductivity polymer solid electrolyte, its preparation method, and its application. Background Technology
[0002] Solid-state electrolytes have attracted significant attention in lithium / sodium-based batteries and other energy storage devices due to their superior safety and stability. Compared to traditional liquid electrolytes, solid-state electrolytes possess inherent characteristics such as leak-proofness, flame retardancy, high thermal stability, and high electrochemical stability, demonstrating great potential in improving battery safety and extending battery life. However, existing solid-state electrolytes, especially polymer solid-state electrolytes, typically suffer from low ionic conductivity, which limits their application in high-performance batteries. Therefore, developing solid-state electrolytes with ionic conductivity greater than 1 mS / cm is crucial. –1 High-conductivity polymer solid electrolytes are key to promoting the development and application of solid electrolytes.
[0003] Ion transport in polymer solid electrolytes (SSEs) primarily relies on the coordination and dissociation between ions and polar groups within amorphous regions. Therefore, reducing the crystallinity of SSEs and increasing the content of amorphous regions is an effective strategy for improving ionic conductivity. Researchers have attempted to reduce crystallinity by introducing inorganic fillers or plasticizers into the polymer matrix. Inorganic fillers hinder the orderly arrangement of polymer molecular chains, while plasticizer molecules reduce crystallinity by weakening the interactions between polymer molecular chains, thereby enhancing the mobility of polymer chains. However, the introduction of inorganic fillers often results in a loss of ionic conductivity, and the addition of plasticizers can trigger side reactions, deteriorating the stability and overall performance of the electrolyte. To overcome these challenges, there is an urgent need to introduce a low-cost material to improve the ionic conductivity of SSEs and to enhance their performance through a simple process. Summary of the Invention
[0004] The purpose of this invention is to provide a high-conductivity polymer solid electrolyte, its preparation method, and its application, thereby solving the problem of low ionic conductivity in existing polymer solid electrolytes.
[0005] The solution of the present invention is: A high-conductivity polymer solid electrolyte with an ionic conductivity greater than 1 mS / cm –1 It includes the following raw materials in parts by weight: 0-30 parts of polymer monomer; Monofunctional organic compounds: 0-30 parts; 0-5 parts of alkali metal salt; 0.6 to 1.2 parts of photoinducer.
[0006] As a preferred technical solution, the polymer monomer is polyethylene glycol diacrylate.
[0007] As a preferred technical solution, the monofunctional organic compound is ethylene carbonate.
[0008] As a preferred technical solution, the photoinducer is 2,2-dimethoxy-2-phenylacetophenone.
[0009] As a preferred technical solution, when a high-conductivity polymer solid electrolyte is used in a sodium-based battery, the alkali metal salt is sodium difluorosulfonamide.
[0010] As a preferred technical solution, when a high-conductivity polymer solid electrolyte is used in a lithium-based battery, the alkali metal salt is lithium bisfluorosulfonylimide.
[0011] As a preferred technical solution, all the raw materials can be purchased from chemical reagent online stores such as Aladdin and McLean.
[0012] This invention also discloses a method for preparing a high-conductivity polymer solid electrolyte, comprising the following steps: (1) Preparation of precursor solution: a. Measure 0-30 parts of polyethylene glycol diacrylate, 0-30 parts of ethylene ethylene carbonate, and 0-5 parts of sodium difluorosulfonamide and add them to a beaker. Then, perform ultrasonic dispersion in the dark for 0-15 minutes to obtain precursor solution A. b. Measure 0.6~1.2 parts of 2,2-dimethoxy-2-phenylacetophenone and add it to precursor solution A, and perform ultrasonic dispersion in the dark for 0~15 min to obtain precursor solution B; (2) Pre-aging of precursor solution: Precursor solution B described in (1) was left to stand at 40-60°C for 1-3 hours under completely dark conditions to obtain pre-aged precursor solution B; (3) Electrochemical prepolarization and in-situ precrosslinking: a. Inject the pre-aged precursor solution B described in (2) into a battery case containing positive and negative electrodes; b. Electrochemical prepolarization is performed by applying a DC electric field using an electrochemical workstation, with a field strength of 5~15 V mm. –1 And activate a light intensity of 1~5 mW / cm². –2 In-situ pre-crosslinking with ultraviolet light at a wavelength of 365~405 nm for 5~15 min yields a gel-state precursor; (4) Complete cross-linking: Maintain a DC electric field with a field strength of 5~15 V mm. –1 And switch the light intensity to 50~100 mW cm. –2Complete cross-linking is achieved by exposing the sample to ultraviolet light with a wavelength of 365~405 nm for 30~60 s, resulting in an ionic conductivity greater than 1 mS cm⁻¹. –1 High conductivity polymer solid electrolyte.
[0013] As a preferred technical solution, the in-situ pre-crosslinking and complete crosslinking steps are ultraviolet light crosslinking. Specifically, ultraviolet light radiation excites the photoinducer to generate active free radicals. The active free radicals interact with the carbon-carbon double bonds of the polymer monomers and monofunctional organic compounds, triggering interchain crosslinking reactions to achieve the preparation of electrolytes.
[0014] In this invention, the pre-aging process utilizes heat to drive molecular thermal motion, prompting a preliminary addition reaction between monofunctional organic compounds and some polymer monomers to form a liquid oligomer network. The electrochemical pre-polarization and in-situ pre-crosslinking processes transform the liquid oligomers into gel-state precursors and induce phase separation, forming a continuous ion transport phase perpendicular to the electrode. The complete crosslinking process utilizes the monofunctionality of ethylene carbonate to consume the effective crosslinking sites of difunctional polyethylene glycol diacrylate, converting reactive carbon-carbon double bonds into stable carbon-carbon single bonds and inhibiting subsequent crosslinking reactions at these sites. This reduces the crystallinity and crosslinking density of the electrolyte, forming a loosely structured polymer network, thereby lowering the ion migration barrier and increasing ion conductivity, thus achieving the preparation of a high-conductivity polymer solid electrolyte.
[0015] The present invention also discloses an application of a high conductivity polymer solid electrolyte, wherein the high conductivity polymer solid electrolyte is assembled with positive and negative electrodes to form a battery.
[0016] As a preferred technical solution, the positive electrode is sodium vanadium phosphate (Na3V2(PO4)3), and the negative electrode is sodium metal (Na).
[0017] Advantages of this invention: The high-conductivity polymer solid electrolyte of this invention is composed of polyethylene glycol diacrylate, ethylene ethylene carbonate, alkali metal salt, and photoinducer. By utilizing the coordinated effects of pre-aging, in-situ pre-crosslinking, electrochemical pre-polarization, and complete crosslinking processes, the high-conductivity polymer solid electrolyte is prepared, offering the following advantages: (1) Pre-aging optimizes network structure: In this invention, the pre-aging step utilizes thermal energy to drive the thermal motion of polymer molecules, causing a slow addition reaction between monofunctional organic compounds and some polymer monomers, forming a preliminary, loosely structured oligomer network in the system. This process pre-consumes some crosslinking sites, essentially optimizing the spatial distribution of crosslinking sites, making the subsequently formed polymer network more uniform.
[0018] (2) Electrochemical prepolarization and in-situ precrosslinking to construct ion transport channels: In this invention, the electrochemical prepolarization and in-situ precrosslinking steps utilize ultraviolet light crosslinking to form a gel-like precursor. Simultaneously, the applied electric field will affect the sodium ions and bis(fluorosulfonyl)imide anions (FSI) in the system. – This generates a directional driving force, forcing sodium ions and bis(fluorosulfonyl)imide anions to migrate and rearrange within the not-yet-fully-crosslinked gel network. Due to the differences in polarity and mobility of the components, this process induces phase separation, thereby spontaneously constructing ion transport channels perpendicular to the electrode direction within the gel, consisting of a continuous phase rich in ions / plasticizers.
[0019] (3) Functionality differences reduce polymer crystallinity and crosslinking density: In this invention, the consumption of active crosslinking sites of polyethylene glycol diacrylate by ethylene carbonate inhibits the subsequent crosslinking reaction at these sites, resulting in reduced crystallinity and weakening the steric hindrance effect within the polymer. This enhances the mobility of polymer chain segments and effectively increases the ion mobility in the electrolyte, thereby significantly improving the ionic conductivity of the polymer solid electrolyte. Simultaneously, it expands the effective crosslinking point spacing of the polymer network, forming a loose network structure, characterized by a decrease in the crosslinking density of the polymer solid electrolyte. According to Flory's free volume theory, the loosening of the network structure induces free volume expansion, thereby reducing the ion migration barrier. Attached Figure Description
[0020] Figure 1 These are X-ray diffraction analysis diagrams of embodiments and comparative examples of the present invention; Figure 2 This is a crosslinking density diagram of the embodiments and comparative examples of the present invention; Figure 3 The diagram shows the ionic conductivity of the embodiments and comparative examples of the present invention. Figure 4 The diagram shows the ion migration activation energy of the embodiments and comparative examples of the present invention. Figure 5 This is a graph showing the cycling performance of the comparative example of the present invention at a current density of 2 C; Figure 6 This is a cycling performance diagram of Embodiment 1 of the present invention at a current density of 2 C; Figure 7 This is a cycling performance diagram of Embodiment 2 of the present invention at a current density of 2 C; Figure 8 This is a cycling performance diagram of Embodiment 3 of the present invention at a current density of 2 C. Detailed Implementation
[0021] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below with reference to specific embodiments.
[0022] The following embodiments are only for further detailed description of the present invention, but do not constitute any limitation on the present invention.
[0023] This experiment aimed to verify the effect of ethylene ethylene carbonate on the performance of polyethylene glycol diacrylate-based polymer solid electrolytes. In this experiment, the monofunctional organic compound ethylene ethylene carbonate reacts with the active crosslinking sites of polyethylene glycol diacrylate during UV crosslinking, converting reactive carbon-carbon double bonds into saturated and stable carbon-carbon single bonds and inhibiting subsequent crosslinking reactions at these sites. This leads to a decrease in the crystallinity and crosslinking density of the polymer solid electrolyte, resulting in a weakening of the steric hindrance effect within the polymer and inducing free volume expansion. Consequently, it lowers the ion migration barrier and enhances the mobility of polymer chains, significantly improving the ionic conductivity of the polymer solid electrolyte and reducing the ion migration activation energy.
[0024] In this experiment, sodium bis(fluorosulfonyl)imide was consistently chosen as the alkali metal salt. The preparation of the examples was carried out according to the preparation method of this invention.
[0025] Example 1 Preparation of a polyethylene glycol diacrylate-based polymer solid electrolyte containing 0-5 parts of ethylene carbonate, specifically: (1) Preparation of precursor solution: a. Measure 0-25 parts of polyethylene glycol diacrylate, 0-5 parts of ethylene ethylene carbonate, and 0-5 parts of sodium difluorosulfonamide and add them to a beaker. Then, perform ultrasonic dispersion in the dark for 0-15 minutes to obtain precursor solution A. b. Measure 0.6~1.2 parts of 2,2-dimethoxy-2-phenylacetophenone and add it to precursor solution A, and perform ultrasonic dispersion in the dark for 0~15 min to obtain precursor solution B; (2) Pre-aging of precursor solution: Precursor solution B described in (1) was left to stand at 40-60°C for 1-3 hours under completely dark conditions to obtain pre-aged precursor solution B; (3) Electrochemical prepolarization and in-situ precrosslinking: a. Inject the pre-aged precursor solution B described in (2) into a battery case containing positive and negative electrodes; b. Electrochemical prepolarization is performed by applying a DC electric field using an electrochemical workstation, with a field strength of 5~15 V mm. –1 And activate a light intensity of 1~5 mW / cm². –2 In-situ pre-crosslinking with ultraviolet light at a wavelength of 365~405 nm for 5~15 min yields a gel-state precursor; (4) Complete cross-linking: Maintain a DC electric field with a field strength of 5~15 V mm.–1 And switch the light intensity to 50~100 mW cm. –2 Complete cross-linking was performed using ultraviolet light with a wavelength of 365~405 nm for 30~60 s, resulting in Example 1.
[0026] Example 2 Preparation of a solid electrolyte based on a polyethylene glycol diacrylate polymer containing 5-10 parts of ethylene carbonate, specifically: (1) Preparation of precursor solution: a. Measure 0-20 parts of polyethylene glycol diacrylate, 5-10 parts of ethylene ethylene carbonate, and 0-5 parts of sodium difluorosulfonamide and add them to a beaker. Then, perform ultrasonic dispersion in the dark for 0-15 minutes to obtain precursor solution A. b. Measure 0.6~1.2 parts of 2,2-dimethoxy-2-phenylacetophenone and add it to precursor solution A, and perform ultrasonic dispersion in the dark for 0~15 min to obtain precursor solution B; (2) Pre-aging of precursor solution: Precursor solution B described in (1) was left to stand at 40-60°C for 1-3 hours under completely dark conditions to obtain pre-aged precursor solution B; (3) Electrochemical prepolarization and in-situ precrosslinking: a. Inject the pre-aged precursor solution B described in (2) into a battery case containing positive and negative electrodes; b. Electrochemical prepolarization is performed by applying a DC electric field using an electrochemical workstation, with a field strength of 5~15 V mm. –1 And activate a light intensity of 1~5 mW / cm². –2 In-situ pre-crosslinking with ultraviolet light at a wavelength of 365~405 nm for 5~15 min yields a gel-state precursor; (4) Complete cross-linking: Maintain a DC electric field with a field strength of 5~15 V mm. –1 And switch the light intensity to 50~100 mW cm. –2 Complete cross-linking was performed using ultraviolet light with a wavelength of 365~405 nm for 30~60 s, resulting in Example 2.
[0027] Example 3 Preparation of a polyethylene glycol diacrylate-based polymer solid electrolyte containing 10-15 parts of ethylene carbonate, specifically: (1) Preparation of precursor solution: a. Measure 0-15 parts of polyethylene glycol diacrylate, 10-15 parts of ethylene ethylene carbonate, and 0-5 parts of sodium difluorosulfonamide and add them to a beaker. Then, perform ultrasonic dispersion in the dark for 0-15 minutes to obtain precursor solution A. b. Measure 0.6~1.2 parts of 2,2-dimethoxy-2-phenylacetophenone and add it to precursor solution A, and perform ultrasonic dispersion in the dark for 0~15 min to obtain precursor solution B; (2) Pre-aging of precursor solution: Precursor solution B described in (1) was left to stand at 40-60°C for 1-3 hours under completely dark conditions to obtain pre-aged precursor solution B; (3) Electrochemical prepolarization and in-situ precrosslinking: a. Inject the pre-aged precursor solution B described in (2) into a battery case containing positive and negative electrodes; b. Electrochemical prepolarization is performed by applying a DC electric field using an electrochemical workstation, with a field strength of 5~15 V mm. –1 And activate a light intensity of 1~5 mW / cm². –2 In-situ pre-crosslinking with ultraviolet light at a wavelength of 365~405 nm for 5~15 min yields a gel-state precursor; (4) Complete cross-linking: Maintain a DC electric field with a field strength of 5~15 V mm. –1 And switch the light intensity to 50~100 mW cm. –2 Complete cross-linking was achieved by exposing the sample to ultraviolet light with a wavelength of 365-405 nm for 30-60 seconds, resulting in Example 3, which exhibits an ionic conductivity greater than 1 mS / cm. –1 High conductivity polymer solid electrolyte.
[0028] The above embodiments consist of polyethylene glycol diacrylate, ethylene ethylene carbonate, alkali metal salt, and photoinducer, and are prepared by ultraviolet light crosslinking. The preparation process has the following characteristics: (1) The pre-aging step utilizes thermal energy to drive the thermal motion of polymer molecules, prompting monofunctional organic compounds to undergo slow addition reactions with some polymer monomers, forming a preliminary, loosely structured oligomer network in the system. This process pre-consumes some crosslinking sites, essentially optimizing the spatial distribution of crosslinking sites.
[0029] (2) The electrochemical prepolarization and in-situ pre-crosslinking steps utilize ultraviolet light to crosslink and form a gel precursor. Simultaneously, the applied electric field generates a directional driving force on sodium ions and bis(fluorosulfonyl)imide anions in the system, forcing them to migrate and rearrange within the incompletely crosslinked gel network. Due to the differences in polarity and mobility of each component, this process induces phase separation, thereby spontaneously constructing ion transport channels perpendicular to the electrode direction within the gel, consisting of a continuous phase rich in ions / plasticizers.
[0030] (3) The consumption of active crosslinking sites of polyethylene glycol diacrylate by the monofunctional organic compound ethylene ethylene carbonate inhibits the subsequent crosslinking reaction at these sites, resulting in reduced crystallinity and weakened steric hindrance within the polymer. This enhances the mobility of polymer chain segments and effectively increases the ion mobility in the electrolyte, thereby significantly improving the ionic conductivity of the polymer solid electrolyte. Simultaneously, it expands the effective crosslinking point spacing of the polymer network, forming a loose network structure, characterized by a decrease in the crosslinking density of the polymer solid electrolyte. According to the Flory free volume theory, the loosening of the network structure induces free volume expansion, thereby reducing the ion migration barrier.
[0031] Comparative Example Preparation of solid electrolytes from polyethylene glycol diacrylate-based polymers that do not contain monofunctional organic compounds, specifically: (1) Preparation of precursor solution: a. To ensure that the quality of the examples and the comparative examples is the same, 0-30 parts of polyethylene glycol diacrylate and 0-5 parts of sodium difluorosulfonamide were measured and added to a beaker, and ultrasonically dispersed in the dark for 0-15 min to obtain precursor solution A; b. Measure 0.6~1.2 parts of 2,2-dimethoxy-2-phenylacetophenone and add it to precursor solution A, and perform ultrasonic dispersion in the dark for 0~15 min to obtain precursor solution B; (2) Pre-aging of precursor solution: Precursor solution B described in (1) was left to stand at 40-60°C for 1-3 hours under completely dark conditions to obtain pre-aged precursor solution B; (3) Electrochemical prepolarization and in-situ precrosslinking: a. Inject the pre-aged precursor solution B described in (2) into a battery case containing positive and negative electrodes; b. Electrochemical prepolarization is performed by applying a DC electric field using an electrochemical workstation, with a field strength of 5~15 V mm. –1 And activate a light intensity of 1~5 mW / cm². –2 In-situ pre-crosslinking with ultraviolet light at a wavelength of 365~405 nm for 5~15 min yields a gel-state precursor; (4) Complete cross-linking: Maintain a DC electric field with a field strength of 5~15 V mm. –1 And switch the light intensity to 50~100 mW cm. –2 Complete cross-linking with ultraviolet light of wavelength 365~405 nm for 30~60 s yields a polyethylene glycol diacrylate-based polymer solid electrolyte that does not contain ethylene carbonate.
[0032] Material characterization For the above comparative and exemplary examples, the crystallinity of the examples and comparative examples was tested using an X-ray diffractometer. The results showed that the crystallinity of the examples was significantly lower than that of the comparative examples, and the crystallinity of Example 3 was significantly lower than that of Example 1 and Example 2.
[0033] The crosslinking densities of the examples and comparative examples were tested using a low-field nuclear magnetic resonance crosslinking density analyzer to characterize the network porosity. The results showed that the crosslinking density of the examples was significantly lower than that of the comparative examples, and the crosslinking density of Example 3 was significantly lower than that of Examples 1 and 2. Based on Flory's free volume theory, network porosity induces free volume expansion, thereby reducing the ion migration barrier.
[0034] Electrochemical performance testing The ionic conductivity of the assembled 2032-type button cell was tested at room temperature for both the example and the comparative examples. The results showed that Example 3 exhibited a high ionic conductivity of 1.39 mS / cm. –1 The ionic conductivity of the examples was significantly higher than that of the comparative examples, and the ionic conductivity of Example 3 was significantly higher than that of Examples 1 and 2.
[0035] The ion migration activation energies of the examples and comparative examples were tested using an electrochemical workstation. The results showed that the ion migration activation energies of the examples were significantly lower than those of the comparative examples, and the ion migration activation energy of Example 3 was significantly lower than that of Examples 1 and 2.
[0036] The Na‖Na3V2(PO4)3 batteries were further assembled using the polymer solid electrolytes from the examples and comparative examples for testing. The results showed that the rate performance and cycle performance of the examples were significantly better than those of the comparative examples, and the rate performance and cycle performance of Example 3 were significantly better than those of Examples 1 and 2.
[0037] This is attributed to the beneficial effects of increased ionic conductivity and reduced ion migration activation energy resulting from the introduction of the monofunctional organic compound ethylene carbonate.
[0038] In summary, the high conductivity polymer solid electrolyte of the present invention exhibits excellent performance in terms of ionic conductivity and electrochemical stability.
[0039] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.
Claims
1. A method for preparing a high-conductivity polymer solid electrolyte, characterized in that, Includes the following steps: (1) Preparation of precursor solution: a. Measure 0-30 parts of polymer monomer, 0-30 parts of monofunctional organic compound, and 0-5 parts of alkali metal salt, and disperse them by ultrasonication in the dark for 0-15 min to obtain precursor solution A; b. Measure 0.6~1.2 parts of the photoinducer and add it to precursor solution A, and disperse it by ultrasonication in the dark for 0~15 min to obtain precursor solution B; (2) Pre-aging of precursor solution: Precursor solution B described in (1) was left to stand at 40-60°C for 1-3 hours under completely dark conditions to obtain pre-aged precursor solution B; (3) Electrochemical prepolarization and in-situ precrosslinking: a. Inject the pre-aged precursor solution B described in (2) into a battery case containing positive and negative electrodes; b. Electrochemical prepolarization is performed by applying a DC electric field using an electrochemical workstation, with a field strength of 5~15 V mm. –1 And activate a light intensity of 1~5 mW / cm². –2 In-situ pre-crosslinking with ultraviolet light at a wavelength of 365~405 nm for 5~15 min yields a gel-state precursor; (4) Complete cross-linking: Maintain a DC electric field with a field strength of 5~15 V mm. –1 And switch the light intensity to 50~100 mW cm. –2 Complete cross-linking is achieved by exposing the sample to ultraviolet light with a wavelength of 365~405 nm for 30~60 s, resulting in an ionic conductivity greater than 1 mS cm⁻¹. –1 High conductivity polymer solid electrolyte.
2. The method for preparing a high-conductivity polymer solid electrolyte as described in claim 1, characterized in that, The polymer monomer is one or more of polyethylene glycol diacrylate, polyethylene glycol dimethacrylate, tripropylene glycol diacrylate, or diurea dimethacrylate.
3. The method for preparing a high-conductivity polymer solid electrolyte as described in claim 1, characterized in that, The monofunctional organic compound is ethylene carbonate.
4. The method for preparing a high-conductivity polymer solid electrolyte as described in claim 1, characterized in that, When a high-conductivity polymer solid electrolyte is used in a sodium-based battery, the alkali metal salt is one or more of sodium bis(fluorosulfonyl)imide or sodium bis(trifluoromethanesulfonyl)imide.
5. The method for preparing a high-conductivity polymer solid electrolyte as described in claim 1, characterized in that, When a high-conductivity polymer solid electrolyte is used in a lithium-based battery, the alkali metal salt is one or more of lithium bis(fluorosulfonyl)imide or lithium bis(trifluoromethanesulfonyl)imide.
6. The method for preparing a high-conductivity polymer solid electrolyte as described in claim 1, characterized in that, The photoinducer is one or more of 2,2-dimethoxy-2-phenylacetophenone, 1-hydroxycyclohexylacetophenone, or 2,4,6-trimethylbenzoyl-diphenylphosphine oxide.
7. The method for preparing a high-conductivity polymer solid electrolyte as described in claim 1, characterized in that, The in-situ pre-crosslinking and complete crosslinking steps are ultraviolet light crosslinking. The ultraviolet light crosslinking includes: ultraviolet light radiation excites a photoinducer to generate active free radicals, and the active free radicals interact with the carbon-carbon double bonds of polymer monomers and monofunctional organic compounds to trigger interchain crosslinking reactions and realize the preparation of electrolytes.
8. A high-conductivity polymer solid electrolyte, characterized in that, The ionic conductivity obtained by the preparation method according to any one of claims 1 to 7 is greater than 1 mS cm. –1 A high-conductivity polymer solid electrolyte, wherein the high-conductivity polymer solid electrolyte comprises polymer monomers, monofunctional organic compounds, alkali metal salts, and photoinducers.
9. A high-conductivity polymer battery, characterized in that, The high-conductivity polymer solid electrolyte as described in claim 8 includes a positive electrode, a negative electrode, and the space between the positive and negative electrodes.