Polymer solid-state electrolyte for ar glasses and preparation method and application thereof

Abstract

The application discloses a kind of polymer solid electrolyte for AR glasses and its preparation method and application, belong to lithium ion solid battery technical field, including the following steps: (1) lithium salt, succinonitrile, propylene group-1,3-sulfonyl lactone and film-forming additive are mixed, polymer monomer and initiator are stirred uniformly, and precursor solution is obtained;(2) the precursor solution is packaged and heated to polymerize, and the polymer solid electrolyte is obtained.The polymer electrolyte of the application has excellent intrinsic safety, improves the safety and reliability of battery.And, the polymer solid battery of the application has higher energy density, and can be applied in AR glasses and other wearable mobile devices.

Description

Technical Field

[0001] This invention belongs to the field of lithium-ion solid-state battery technology, and particularly relates to a polymer solid-state electrolyte for AR glasses, its preparation method and application. Background Technology

[0002] Currently, AR glasses are rapidly evolving towards seamless wearability and full-scene adaptability, and have been widely used in consumer entertainment, industrial inspection, medical assistance, and other fields, becoming the core terminal for the next generation of human-computer interaction. However, their industrialization process is limited by high-energy-density battery technology. Current mainstream products still use traditional liquid lithium batteries, which have low energy density and short battery life, making it difficult to meet the needs of all-day use. Solid-state batteries, on the other hand, have significant advantages in energy density and safety, and the adoption of solid-state batteries is expected to solve the battery life problem of AR glasses.

[0003] Polymer solid-state batteries offer significant advantages in wearable device applications due to their excellent mechanical properties, good processing characteristics, and low manufacturing costs. However, polymer solid-state batteries suffer from low ionic conductivity (<10). -5 S cm -1 Narrow electrochemical window (<4V vs. Li) + The shortcomings of polymer solid electrolytes (such as Li) have hindered their development. Therefore, providing a polymer solid electrolyte with excellent ionic conductivity and a wide electrochemical window is of great theoretical significance and application value for promoting the development of high-energy-density and high-safety lithium batteries.

[0004] Yin et al. (Journal of Power Sources, 2025) disclosed the use of a ternary lithium salt (LiTFSI-LiDFOB-LiNO3) system to regulate the behavior of succinate-based electrolytes. However, when matched with NCM811 and LCO cathodes, the active material loading is low, and the energy density cannot meet the requirements of practical applications. Its performance in practical applications is difficult to evaluate, and it cannot be directly used in AR glasses.

[0005] Therefore, how to provide a high-energy-density lithium battery for AR glasses is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] To address the aforementioned technical problems, this invention proposes a polymer solid electrolyte for AR glasses, its preparation method, and its application.

[0007] To achieve the above objectives, the present invention provides the following technical solution: A method for preparing a polymer solid electrolyte for AR glasses includes the following steps: (1) Mix lithium salt, succinate, propylene-1,3-sulfonyl lactone and film-forming additive, add polymer monomer and initiator and stir evenly to obtain precursor solution; (2) The precursor solution is encapsulated and then heated to polymerize to obtain a polymer solid electrolyte.

[0008] Beneficial Effects: This invention, by incorporating polymer monomers and initiators to prepare polymer electrolytes in situ under heating conditions, effectively improves the interfacial contact between the solid electrolyte and the electrode, reducing interfacial impedance. Propylene-1,3-sulfonyl lactone, due to its S=O electron-withdrawing group, can form hydrogen bonds with the active hydrogen in succinate and also has a strong coordination ability with Li metal ions. This helps promote lithium salt dissociation and weakens the side reactions of active hydrogen during battery cycling, resulting in higher stability (especially under high voltage conditions) compared to other electrolyte materials.

[0009] Preferably, the molar ratio of lithium salt, succinate, propylene-1,3-sulfonyl lactone and film-forming additive in step (1) is 1:(4~5):(0~2):(0~0.2), more preferably 1:4:2, 1:5:0, 1:5:1 or 1:5:2.

[0010] Beneficial effects: When the molar ratio of lithium salt, succinate, and propylene-1,3-sulfonyl lactone is 1:4:2, 1:5:0, 1:5:1, or 1:5:2, a stable deep eutectic solution can be formed.

[0011] Preferably, the lithium salt is lithium bis(trifluoromethanesulfonylimide); The polymer monomer is ethoxylated trimethylolpropane triacrylate; The film-forming additive is lithium difluorooxalate borate; The initiator is azobisisobutyronitrile.

[0012] Optionally, the amount of ethoxylated trimethylolpropane triacrylate added is 15 wt. of the mixture obtained by mixing lithium salt, succinic acid, propylene-1,3-sulfonyl lactone and film-forming additive.

[0013] Optionally, the amount of azobisisobutyronitrile added is 0.5 wt. of the mixture obtained by mixing lithium salt, succinic anion, propylene-1,3-sulfonyl lactone and film-forming additive.

[0014] Preferably, the encapsulation in step (2) involves adding the precursor solution dropwise into the separator to encapsulate the battery.

[0015] Preferably, the diaphragm is made of glass fiber.

[0016] Preferably, the heating polymerization in step (2) is carried out at a temperature of 65°C for 12 hours.

[0017] Beneficial Effects: This invention utilizes in-situ solidification to inject a liquid precursor solution into the battery. After the precursor solution fully wets the electrodes and separator, under heating conditions, the electrolyte system undergoes a polymerization reaction through the action of an initiator, thereby transforming the precursor solution from a liquid state into a solid electrolyte. The method provided by this invention makes the preparation of solid electrolytes highly compatible with existing battery manufacturing systems and improves the contact between the electrodes and the solid electrolyte. Under the above conditions, the initiator azobisisobutyronitrile (AIBN) can be completely decomposed, and the polymer can be completely polymerized.

[0018] A polymer solid electrolyte for AR glasses prepared by the method described above.

[0019] An application of a polymer solid electrolyte as described above in AR glasses.

[0020] A method for fabricating a high-energy-density solid-state battery for AR glasses includes the following steps: The precursor solution described above is injected into the positive electrode material, negative electrode material, and separator. After the battery is encapsulated, it is heated to polymerize, thus obtaining a high-energy-density solid-state battery containing the polymer solid electrolyte.

[0021] Preferably, the cathode material includes one of lithium iron phosphate, high-nickel ternary cathode, lithium manganese iron phosphate, lithium-rich manganese-based cathode material, and lithium cobalt oxide.

[0022] More preferably, the high-nickel ternary lithium-ion ... 0.91 Co 0.06 Mn 0.03 O2 (NCM91) type cathode material; The lithium-rich manganese-based cathode material is 0.3Li₂MnO₃•0.7LiNi. 0.5 Mn 0.5 O2 (LRMO) type cathode material. Preferably, the anode material includes one of lithium metal sheet (Li), high silicon content silicon-carbon, hard carbon, and soft carbon.

[0023] More preferably, the high-silicon-content silicon-carbon alloy is Si / C, with a specific capacity greater than 1000 mAh. -1 .

[0024] A high-energy-density solid-state battery for AR glasses prepared by the method described above.

[0025] Compared with the prior art, the present invention has the following advantages and technical effects: The polymer solid-state electrolyte obtained in this invention successfully constructs a polymer solid-state battery system. This invention introduces polymer monomers into a deep eutectic solution (prepared by mixing succinate, lithium bis(trifluoromethanesulfonylimide), propylene-1,3-sulfonyl lactone, and lithium difluorooxalate borate, with the addition of a trace amount of the film-forming additive lithium difluorooxalate borate). The polymer solid-state electrolyte can be prepared in situ inside the battery via a thermal polymerization reaction. This method is simple to operate and has high preparation efficiency. The polymer solid-state electrolyte obtained in this invention significantly improves battery safety while achieving high energy density output, with a corresponding ionic conductivity of 9.1 × 10⁻⁶. -4 S cm -1 The electrochemical window reaches 5.7V, and the NCM91||Li full cell retains 77.5% of its capacity after 300 cycles under a voltage range of 3~4.5V and a rate of 0.5C. Simultaneously, the polymer electrolyte of this invention exhibits excellent intrinsic safety, improving the safety and reliability of the battery. Furthermore, the polymer solid-state battery of this invention has high energy density, enabling its application in wearable mobile devices such as AR glasses. Attached Figure Description

[0026] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 These are photographs of the polymer electrolyte precursor solution (a) and the polymer solid electrolyte (b) obtained in Example 1 of the present invention. Figure 2 These are photographs of the combustion test of the polymer solid electrolyte obtained in Example 1 of this invention; Among them, (a) is the state of the electrolyte when it is close to the fire source, and (b) is the state two seconds after it is close to the fire source; Figure 3 The infrared spectra of the polymer solid electrolyte obtained in Example 1 of the present invention, the solid electrolyte prepared in Comparative Example 1, succinate, propylene-1,3-sulfonyl lactone, and a mixture of succinate and propylene-1,3-sulfonyl lactone are shown. Among them, (a) is the infrared spectrum corresponding to the -CH2 vibration band, and (b) is the infrared spectrum corresponding to the S=O vibration band. Figure 4 The results are local Raman fitting of the polymer solid electrolyte obtained in Example 1 and the solid electrolyte prepared in Comparative Example 1. Figure 5 This is a comparison graph showing the cycle performance of Li||Li symmetric cells obtained in Application Example 1 and Comparative Application Example 5 at 30°C. Figure 6A comparison graph showing the cycle performance of NCM91||Li batteries obtained in Application Example 3 and Comparative Application Example 1 of the present invention; Figure 7 The cycle performance graphs of the NCM91||Li batteries obtained by comparing Application Examples 2-4 and Application Example 9 of the present invention are shown. Figure 8 The circuit performance diagram of the NCM91||Li pouch battery obtained in Example 4 of this invention is shown. Figure 9 The graph shows the cycle performance of the LiFePO4||Li battery obtained in Example 5 of this invention. Figure 10 This is a charge-discharge curve of the NCM91||Si / C battery obtained in Example 6 of this invention; Figure 11 The charging and discharging curves of the Si / C||Li battery obtained in Example 7 of this invention are shown. Figure 12 The charge-discharge curve of the LRMO||Li battery obtained in Example 8 of this invention; Figure 13 The graph shows the cycle performance of the LCO||Li battery obtained in Application Example 2 of this invention. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] Unless otherwise specified, all raw materials used in the embodiments of this invention were purchased through commercial channels; In this embodiment of the invention, the diaphragms are all glass fiber diaphragms, purchased from Ouli (Chongqing) New Materials Co., Ltd., with product model GF / A 2916 glass fiber diaphragm; Unless otherwise specified, room temperature or normal temperature in the embodiments of the present invention refers to 25±3℃.

[0030] Example 1 A method for preparing a polymer solid electrolyte for AR glasses includes the following steps: (1) Lithium bis(trifluoromethanesulfonyl)imide, succinate, propylene-1,3-sulfonyl lactone, and lithium difluorooxalate borate were mixed and stirred in a molar ratio of 1:5:2:0.2 to obtain a mixed solution. Then, 15 wt.% of ethoxylated trimethylolpropane triacrylate and 0.5 wt.% of azobisisobutyronitrile were added to the mixed solution and stirred to prepare a polymer electrolyte precursor solution, such as... Figure 1 Part a.

[0031] (2) After the polymer electrolyte precursor solution is placed at 65°C for 12 hours, in-situ thermal polymerization can be carried out inside the battery to form a polymer solid electrolyte. The morphology of the polymer solid electrolyte is as follows: Figure 1 Part b.

[0032] Example 2 A method for preparing a polymer solid electrolyte for AR glasses, differing from Example 1 in that step (1) involves mixing lithium bis(trifluoromethanesulfonyl)imide, succinate, propylene-1,3-sulfonyl lactone, and lithium difluorooxalate borate in a molar ratio of 1:5:1:0.2, specifically including the following steps: (1) Lithium bis(trifluoromethanesulfonylimide), succinate, propylene-1,3-sulfonyl lactone and lithium difluorooxalate borate were mixed and stirred in a molar ratio of 1:5:1:0.2 to obtain a mixed solution. Ethoxylated trimethylolpropane triacrylate and azobisisobutyronitrile were added to the mixed solution at a mass of 15 wt.% and stirred to prepare a polymer electrolyte precursor solution.

[0033] (2) After the polymer electrolyte precursor solution is placed at 65°C for 12 hours, it can be thermally polymerized in situ inside the battery to form a polymer solid electrolyte.

[0034] Example 3 The only difference from Example 1 is that in step (1), lithium bis(trifluoromethanesulfonylimide), succinate, propylene-1,3-sulfonyl lactone, and lithium difluorooxalate borate are mixed in a molar ratio of 1:4:2:0.2. Specifically, the following steps are included: (1) Lithium bis(trifluoromethanesulfonylimide), succinate, propylene-1,3-sulfonyl lactone and lithium difluorooxalate borate were mixed and stirred in a molar ratio of 1:4:2:0.2 to obtain a mixed solution. Ethoxylated trimethylolpropane triacrylate and azobisisobutyronitrile were added to the mixed solution at a mass of 15 wt.% and stirred to prepare a polymer electrolyte precursor solution.

[0035] (2) After the polymer electrolyte precursor solution is placed at 65°C for 12 hours, it can be thermally polymerized in situ inside the battery to form a polymer solid electrolyte.

[0036] Comparative Example 1 The difference from Example 1 is that in step (1), lithium bis(trifluoromethanesulfonyl)imide, succinate, and lithium difluorooxalateborate are mixed in a molar ratio of 1:5:0.2, specifically including the following steps: (1) Lithium bis(trifluoromethanesulfonylimide), succinate and lithium difluorooxalate borate were mixed and stirred in a molar ratio of 1:5:0.2 to obtain a mixed solution. Ethoxylated trimethylolpropane triacrylate and azobisisobutyronitrile were added to the mixed solution at a mass of 15 wt.% and stirred to prepare a polymer electrolyte precursor solution.

[0037] (2) After the polymer electrolyte precursor solution is placed at 65°C for 12 hours, it can be thermally polymerized in situ inside the battery to form a polymer solid electrolyte.

[0038] Comparative Example 2 The only difference from Example 1 is that allyl-1,3-sulfonyl lactone is replaced with an equimolar amount of lithium nitrate. Specifically, the following steps are included: (1) Lithium bis(trifluoromethanesulfonyl)imide, succinate, lithium nitrate and lithium difluorooxalate borate were mixed and stirred in a molar ratio of 1:5:2:0.2 to obtain a mixed solution. Ethoxylated trimethylolpropane triacrylate and azobisisobutyronitrile were added to the mixed solution at a mass of 15 wt.% and stirred to prepare a polymer electrolyte precursor solution.

[0039] (2) After the polymer electrolyte precursor solution is placed at 65°C for 12 hours, it can be thermally polymerized in situ inside the battery to form a polymer solid electrolyte.

[0040] Comparative Example 3 The only difference from Example 1 is that succinic anion is replaced with an equimolar amount of ethylene carbonate. Specifically, the steps include: (1) Lithium bis(trifluoromethanesulfonylimide), ethylene carbonate, propylene-1,3-sulfonyl lactone and lithium difluorooxalate borate were mixed and stirred in a molar ratio of 1:5:2:0.2 to obtain a mixed solution. Ethoxylated trimethylolpropane triacrylate and azobisisobutyronitrile were added to the mixed solution at a mass of 15 wt.% and stirred to prepare a polymer electrolyte precursor solution.

[0041] (2) After the polymer electrolyte precursor solution is placed at 65°C for 12 hours, it can be thermally polymerized in situ inside the battery to form a polymer solid electrolyte.

[0042] Comparative Example 4 The only difference from Example 1 is that succinic anionylene is replaced with an equimolar amount of N-methylacetamide. Specifically, the following steps are included: (1) Lithium bis(trifluoromethanesulfonylimide), N-methylacetamide, propylene-1,3-sulfonyl lactone and lithium difluorooxalate borate were mixed and stirred in a molar ratio of 1:5:2:0.2 to obtain a mixed solution. Ethoxylated trimethylolpropane triacrylate and azobisisobutyronitrile were added to the mixed solution at a mass of 15 wt.% and stirred to prepare a polymer electrolyte precursor solution.

[0043] (2) After the polymer electrolyte precursor solution is placed at 65°C for 12 hours, it can be thermally polymerized in situ inside the battery to form a polymer solid electrolyte.

[0044] Application Example 1 A high-energy-density solid-state battery for AR glasses uses lithium metal as the negative electrode material, lithium metal as the positive electrode material, and the polymer solid electrolyte obtained in Example 1 as the electrolyte. The polymer electrolyte precursor solution obtained in step (1) of Example 1 is injected into the positive electrode material, negative electrode material and separator for in-situ thermal polymerization, and assembled to obtain a high-energy-density Li||Li symmetric battery for AR glasses.

[0045] Application Example 2 A high-energy-density solid-state battery for AR glasses uses lithium metal as the negative electrode material, lithium cobalt oxide as the positive electrode material, and the polymer solid electrolyte obtained in Example 1 as the electrolyte. The polymer electrolyte precursor solution obtained in step (1) of Example 1 is injected into the positive electrode material, negative electrode material and separator for in-situ thermal polymerization, and assembled to obtain a high-energy-density LCO||Li battery for AR glasses.

[0046] Application Example 3 A high-energy-density solid-state battery for AR glasses uses lithium metal as the negative electrode material, NCM91 type positive electrode material, and polymer solid electrolyte obtained in Example 1 as electrolyte. The polymer electrolyte precursor solution obtained in step (1) of Example 1 is injected into the positive electrode material, negative electrode material and separator for in-situ thermal polymerization, and assembled to obtain a high-energy-density NCM91||Li battery for AR glasses.

[0047] Application Example 4 A high-energy-density solid-state battery for AR glasses uses lithium metal as the negative electrode material, NCM91 type positive electrode material, and polymer solid electrolyte obtained in Example 1 as electrolyte. The polymer electrolyte precursor solution obtained in step (1) of Example 1 is injected into the positive electrode material, negative electrode material and separator for in-situ thermal polymerization, and assembled to obtain a high-energy-density NCM91||Li soft pack battery for AR glasses.

[0048] Application Example 5 A high-energy-density solid-state battery for AR glasses uses lithium metal as the negative electrode material, lithium iron phosphate as the positive electrode material, and the polymer solid electrolyte obtained in Example 1 as the electrolyte. The polymer electrolyte precursor solution obtained in step (1) of Example 1 is injected into the positive electrode material, negative electrode material and separator for in-situ thermal polymerization, and assembled to obtain a high-energy-density LiFePO4||Li battery for AR glasses.

[0049] Application Example 6 A high-energy-density solid-state battery for AR glasses uses silicon-carbon as the negative electrode material, NCM91 type positive electrode material, and polymer solid electrolyte obtained in Example 1 as the electrolyte. The polymer electrolyte precursor solution obtained in step (1) of Example 1 is injected into the positive electrode material, negative electrode material and separator for in-situ thermal polymerization, and assembled to obtain a high-energy-density NCM91||Si / C battery for AR glasses.

[0050] Application Example 7 A high-energy-density solid-state battery for AR glasses uses lithium metal as the negative electrode material, silicon carbon as the positive electrode material, and the polymer solid electrolyte obtained in Example 1 as the electrolyte. The polymer electrolyte precursor solution obtained in step (1) of Example 1 is injected into the positive electrode material, negative electrode material and separator for in-situ thermal polymerization, and assembled to obtain a high-energy-density Si / C||Li battery for AR glasses.

[0051] Application Example 8 A high-energy-density solid-state battery for AR glasses uses lithium metal as the negative electrode material, lithium-rich manganese-based positive electrode material, and polymer solid electrolyte obtained in Example 1 as the electrolyte. The polymer electrolyte precursor solution obtained in step (1) of Example 1 is injected into the positive electrode material, negative electrode material and separator for in-situ thermal polymerization, and assembled to obtain a high-energy-density LRMO||Li battery for AR glasses.

[0052] Application Example 9 A solid-state battery for AR glasses uses lithium metal as the negative electrode material, NCM91 type positive electrode material, and polymer solid electrolyte obtained in Example 3 as electrolyte. The polymer electrolyte precursor solution obtained in step (1) of Example 3 is injected into the positive electrode material, negative electrode material and separator for in-situ thermal polymerization, and assembled to obtain NCM91||Li battery for AR glasses.

[0053] Comparative Application Example 1 A solid-state battery for AR glasses uses lithium metal as the negative electrode material, NCM91 type positive electrode material, and polymer solid electrolyte obtained in Comparative Example 1 as electrolyte. The polymer electrolyte precursor solution obtained in step (1) of Comparative Example 1 is injected into the positive electrode material, negative electrode material and separator for in-situ thermal polymerization, and assembled to obtain NCM91||Li battery for AR glasses.

[0054] Comparative Application Example 2 A solid-state battery for AR glasses uses lithium metal as the negative electrode material, NCM91 type positive electrode material, and polymer solid electrolyte obtained in Comparative Example 2 as electrolyte. The polymer electrolyte precursor solution obtained in step (1) of Comparative Example 2 is injected into the positive electrode material, negative electrode material and separator for in-situ thermal polymerization, and assembled to obtain NCM91||Li battery for AR glasses.

[0055] Comparative Application Example 3 A solid-state battery for AR glasses uses lithium metal as the negative electrode material, NCM91 type positive electrode material, and polymer solid electrolyte obtained in Comparative Example 3 as electrolyte. The polymer electrolyte precursor solution obtained in step (1) of Comparative Example 3 is injected into the positive electrode material, negative electrode material and separator for in-situ thermal polymerization, and assembled to obtain NCM91||Li battery for AR glasses.

[0056] Comparative Application Example 4 A solid-state battery for AR glasses uses lithium metal as the negative electrode material, NCM91 type positive electrode material, and polymer solid electrolyte obtained in Comparative Example 4 as electrolyte. The polymer electrolyte precursor solution obtained in step (1) of Comparative Example 4 is injected into the positive electrode material, negative electrode material and separator for in-situ thermal polymerization, and assembled to obtain NCM91||Li battery for AR glasses.

[0057] Comparative Application Example 5 A solid-state battery for AR glasses uses lithium metal as the negative electrode material, lithium metal as the positive electrode material, and the polymer solid electrolyte obtained in Comparative Example 1 as the electrolyte. The polymer electrolyte precursor solution obtained in step (1) of Comparative Example 1 is injected into the positive electrode material, negative electrode material and separator for in-situ thermal polymerization to assemble a Li||Li symmetric battery for AR glasses.

[0058] Technical effects: 1. The ionic conductivity, lithium-ion transference number, and electrochemical window of the solid electrolytes obtained in Examples 1-3 and Comparative Examples 1-4 at 30 °C were determined according to the steps / standards of AC impedance spectroscopy, AC impedance-chronoamperometry, and linear sweep voltammetry. The results are shown in Table 1.

[0059] Table 1. Basic properties of the polymer solid electrolytes prepared in the examples and comparative examples. It can be seen that polymer electrolytes prepared with propenyl-1,3-sulfonyl lactone in different molar ratios exhibit varying degrees of improvement in ionic conductivity, lithium-ion transference number, and electrochemical window. Furthermore, the polymer electrolyte with the optimal molar ratio of 1:5:2 demonstrates the best ionic conductivity, lithium-ion transference number, and electrochemical window, outperforming all comparative solid-state electrolytes. This is attributed to the promoting effect of propenyl-1,3-sulfonyl lactone on Li... + The dissociation of ions and their participation in Li + The solvation structure of the ions accelerates the Li + Ion migration.

[0060] 2. Combustion Test Figure 2 The combustion test of the polymer solid electrolyte provided in Example 1 of this invention was conducted by bringing a flame gun close to the electrolyte and observing its flammability. Figure 2 As can be seen, the polymer solid electrolyte obtained in Example 1 of the present invention does not exhibit obvious combustion phenomena and demonstrates excellent flame retardant properties.

[0061] 3. Infrared spectroscopy test Figure 3 Infrared spectral test results of the polymer solid electrolyte (PLSP electrolyte) prepared in Example 1 of the present invention, the solid electrolyte (PLS electrolyte) prepared in Comparative Example 1, succinate (SN), propylene-1,3-sulfonyl lactone (PES), and a mixture of succinate and propylene-1,3-sulfonyl lactone (SN+PES).

[0062] It can be seen that the S=O of propenyl-1,3-sulfonyl lactone has a strong coordination effect with the -CH2 of succinate, which can significantly improve the compatibility of the electrolyte with lithium metal.

[0063] 4. Raman fitting Figure 4 The results show the local Raman fitting of the polymer solid electrolyte (PLSP electrolyte) prepared in Example 1 and the solid electrolyte (PLS electrolyte) prepared in Comparative Example 1.

[0064] It can be seen that the polymer solid electrolyte corresponds to Li + The peak area of ​​the -CN coordination group decreased significantly, indicating that the addition of propenyl-1,3-sulfonyl lactone participated in the Li + The coordination of succinate with Li weakens the interaction between succinate and Li. + Coordination.

[0065] 5. Cyclic performance Figure 5This is a comparison graph showing the cycling performance of Li||Li symmetric batteries obtained in Application Example 1 (PLSP electrolyte) and Comparative Application Example 5 (PLS electrolyte) at 30°C.

[0066] It can be seen that the battery obtained from Example 1 exhibits more stable and longer cycle performance at 1 mA cm⁻¹. -2 It can be stably cycled for more than 1000 hours under current density conditions.

[0067] Figure 6 This is a comparison graph showing the cycle performance of NCM91||Li batteries obtained using Application Example 3 (PLSP electrolyte) and Comparative Application Example 1 (PLS electrolyte). The test temperature was 30°C, the current rate was 0.5C, and the charge / discharge voltage range was 3.0~4.5V.

[0068] It can be seen that the full cell assembled using the polymer solid electrolyte obtained in Example 1 (Application Example 3) has a capacity retention rate of 77.5% after 300 cycles, while the full cell assembled using the solid electrolyte obtained in Application Example 1 has a capacity retention rate of only 29.3% after 300 cycles.

[0069] Figure 7 This diagram shows the cycle performance of the NCM91||Li batteries obtained in Comparative Application Examples 2-4 and 9 (corresponding to Comparative Examples 2-4 and 9 in the figure). The test temperature was 30°C, the current rate was 0.5C, and the charge / discharge voltage range was 3.0~4.5V. Comparative Application Example 2 exhibited unstable charge / discharge performance during cycling, while Comparative Application Example 3 showed a lower discharge specific capacity. Figure 6 Compared with the NCM91||Li battery obtained in Application Example 3, there is a significant performance gap, and the capacity retention rate of Application Example 9 is lower than that of Application Example 3.

[0070] Figure 8 The figure shows the cycle performance of the NCM91||Li soft-pack battery (PLSP electrolyte) obtained in Example 4 of this invention; wherein the test temperature is room temperature, the charge / discharge voltage range is 3.0~4.5V, the current rate is 0.1C, and the active material loading is 9.5mg cm⁻¹. -2 .Depend on Figure 8 It can be seen that the polymer solid electrolyte obtained in Example 1 exhibits excellent practicality in the pouch cell of Application Example 4.

[0071] Figure 9 This is a cycle performance diagram of the LiFePO4||Li battery (PLSP electrolyte) obtained in Application Example 5 of this invention; the test temperature was 30°C, and the current rate was 3C. Figure 9As can be seen, the LiFePO4||Li battery obtained in Example 5 of this invention exhibits excellent cycle stability and high capacity retention.

[0072] 6. Charge-discharge curves Figure 10 This is a charge-discharge curve of the NCM91||Si / C battery (PLSP electrolyte) obtained in Example 6 of this invention; wherein the test temperature is 30℃, the current rate is 0.1C, and the charge-discharge voltage range is 2.4V~4.3V.

[0073] Depend on Figure 10 As can be seen, the NCM91||Si / C battery obtained in Example 6 of this invention exhibits excellent charging and discharging capabilities.

[0074] Figure 11 The above is a charge-discharge curve of the Si / C||Li battery (PLSP electrolyte) obtained in Example 7 of this invention; wherein the test temperature is 30°C and the current rate is 0.1C.

[0075] Depend on Figure 11 It can be seen that a stable charging and discharging process is exhibited.

[0076] Figure 12 The charge-discharge curves of the LRMO||Li battery obtained in Example 8 are shown; the test temperature was 30°C and the current rate was 0.2C.

[0077] Depend on Figure 12 It can be seen that a stable charging and discharging process is exhibited.

[0078] Figure 13 The graph shows the cycle performance of the LCO||Li battery obtained in Example 2; the test temperature was 30℃, the current rate was 0.5C, and the charge / discharge voltage range was 3V~4.6V. Depend on Figure 13 As can be seen, the LCO||Li battery obtained in Example 2 exhibits excellent cycle stability.

[0079] In summary, the polymer solid electrolyte obtained in the embodiments of this invention exhibits rapid lithium-ion transport rate, high lithium-ion transference number, and excellent safety in battery applications. Furthermore, the addition of propylene-1,3-sulfonyl lactone significantly broadens the electrochemical window, demonstrates good compatibility with the electrode interface, and maintains stable cycling under high voltage conditions. The full cell assembled using the polymer solid electrolyte obtained in Example 1 exhibits excellent electrochemical performance and has broad prospects for practical applications.

[0080] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method for preparing a polymer solid electrolyte for AR glasses, characterized in that, Includes the following steps: (1) Mix lithium salt, succinate, propylene-1,3-sulfonyl lactone and film-forming additive, add polymer monomer and initiator and stir evenly to obtain precursor solution; (2) The precursor solution is encapsulated and then heated to polymerize to obtain a polymer solid electrolyte.

2. The method for preparing a polymer solid electrolyte for AR glasses according to claim 1, characterized in that, In step (1), the molar ratio of lithium salt, succinate, propylene-1,3-sulfonyl lactone and film-forming additive is 1:(4~5):(0~2):(0~0.2).

3. The method for preparing a polymer solid electrolyte for AR glasses according to claim 1, characterized in that, The lithium salt is lithium bis(trifluoromethanesulfonylimide); The polymer monomer is ethoxylated trimethylolpropane triacrylate; The film-forming additive is lithium difluorooxalate borate; The initiator is azobisisobutyronitrile.

4. The method for preparing a polymer solid electrolyte for AR glasses according to claim 1, characterized in that, In step (2), the heating polymerization temperature is 65°C and the time is 12h.

5. A polymer solid electrolyte for AR glasses prepared by the preparation method according to any one of claims 1-4.

6. The application of the polymer solid electrolyte as described in claim 5 in AR glasses.

7. A method for preparing a high-energy-density solid-state battery for AR glasses, characterized in that, Includes the following steps: The precursor solution described in step (1) of claim 1 is injected into the positive electrode material, the negative electrode material and the separator, and the battery is encapsulated and then heated to polymerize, thereby obtaining a high energy density solid battery containing the polymer solid electrolyte.

8. A high-energy-density solid-state battery for AR glasses according to claim 7, characterized in that, The cathode material includes one of lithium iron phosphate, high-nickel ternary cathode, lithium manganese iron phosphate, lithium-rich manganese-based cathode material, and lithium cobalt oxide.

9. A high-energy-density solid-state battery for AR glasses according to claim 7, characterized in that, The negative electrode material includes one of lithium metal sheet, high silicon content silicon-carbon, hard carbon, and soft carbon.

10. A high-energy-density solid-state battery for AR glasses prepared by the preparation method according to any one of claims 7-9.

Images