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A poly(1,5-dioxepan-2-one)-based block polymer, its preparation method and application

A technology of dioxetane and block polymer is applied in the field of poly-based block polymer and its preparation, which can solve the problems of inability to meet the ionic conductivity of electrolytes, low ionic conductivity and the like, and improve mechanical properties. and thermal stability, simple preparation process, quantifiable production effect

Active Publication Date: 2022-06-03
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high crystallinity of PEO, the ionic conductivity of PEO-based polymer electrolytes at room temperature is very low (10 -8 ~10 -7 S cm -1 ), which cannot meet the requirements of practical electrolyte ionic conductivity (>10 at room temperature -4 S cm -1 )

Method used

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  • A poly(1,5-dioxepan-2-one)-based block polymer, its preparation method and application
  • A poly(1,5-dioxepan-2-one)-based block polymer, its preparation method and application
  • A poly(1,5-dioxepan-2-one)-based block polymer, its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] 1. First, heat and vacuum the Shrank bottle with magnetron, replace nitrogen three times back and forth, and remove water and air. Quickly add 1,5-dioxepan-2-one (DXO) (3.48 g, 30 mmol), benzyl alcohol (BnOH) (108 mg, 1 mmol), 5 mL THF under nitrogen, "freeze vacuum-thaw" Three times, 1,8-diazabicycloundec-7-ene (DBU) (152 mg, 1 mmol) was then added under nitrogen. The reaction was carried out at 25 °C for 6 h, and a small amount of hydrochloric acid / methanol mixed solvent was added to terminate the reaction. Excess diethyl ether was used as a precipitant and dried at room temperature to obtain poly(1,5-dioxepane-2-one homopolymer) ( PDXO 30 ).

[0058] 2. Insert the PDXO 30 (3g, 1mmol), 10mL CH 2 Cl 2 A three-necked flask placed in a -5°C low temperature reactor was added, and 2-bromoisobutyryl bromide (345 mg, 1.5 mmol) was dissolved in 5 mL of CH 2 Cl 2 and added dropwise to the above three-necked flask, after the dropwise addition, the reaction was carried ou...

Embodiment 2

[0066] The difference from Example 1 is: the amount of PS described in step 3 is (5.20 g, 50 mmol), and other implementation conditions are the same as those in Example 1 to synthesize PDXO 30 -b-PS 30 Block polymer electrolytes are the same to make PDXO 30 -b-PS 50 Block polymer electrolytes. By analyzing the polymer electrolyte, we get M n =8000g / mol of PDXO 30 -b-PS 50 A block polymer electrolyte with a block PDXO:PS molar ratio of 3:5.

Embodiment 3

[0068] The difference from Example 1 is: the amount of PS described in step 3 is (1.04 g, 10 mmol), and other implementation conditions are the same as those in Example 1 to synthesize PDXO 30 -b-PS 30 Block polymer electrolytes are the same to make PDXO 30 -b-PS 10 Block polymer electrolytes. By analyzing the polymer electrolyte, we get M n =4000g / mol of PDXO 30 -b-PS 10 A block polymer electrolyte with a block PDXO:PS molar ratio of 3:1.

[0069] The performance of the block polymer electrolyte obtained in Examples 1-3 is characterized, and the test results are shown in Table 1. It can be seen from Table 1 that in the PDXO-b-PS block polymer electrolyte, with the increase of the PDXO block As the content increases, the room temperature ionic conductivity of the electrolyte also increases, indicating that the PDXO block in the PDXO-b-PS block polymer electrolyte is beneficial to Li + Transmission.

[0070] Table 1 Properties of the block polymer electrolytes obtained ...

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Abstract

The invention belongs to the technical field of lithium-ion battery electrolytes, and discloses a poly(1,5-dioxepane-2-one)-based block polymer, a preparation method and an application thereof. The block polymer of described poly(1,5-dioxepan-2-ketone) base is abbreviated as the block polymer of PDXO base, and its structure is as shown in formula (1): wherein, R is n=1-500, m=1-500, x=1-3. The present invention has synthesized the block polymer synthesis process based on poly(1,5-dioxepane-2-ketone), which is convenient and feasible, and the prepared polymer has good interfacial stability as a polyelectrolyte for lithium-ion batteries , wide electrochemical window (>4.5V), high room temperature ionic conductivity (>10 ‑5 Scm ‑1 ).

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery electrolytes, and in particular relates to a poly(1,5-dioxepane-2-one)-based block polymer and a preparation method and application thereof. Background technique [0002] From portable electronics, high-power power tools to electric vehicles, lithium-ion batteries are playing an increasingly important role in everyday life. However, currently commercially available organic liquid electrolytes (LEs) cannot perfectly match Li metal anodes due to the excessive growth of Li dendrites and their high reactivity. In addition, the volatilization and leakage of LEs also pose a safety risk of fire or explosion, which may cause great damage, especially for batteries with high energy density. Solid-state electrolytes (SSEs) are the best choice for preventing Li dendrite overgrowth and electrolyte leakage, which is of great significance for the development of high-energy-density Li metal batteries...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F293/00C08F212/08H01M10/0565
CPCC08F293/00C08F212/08H01M10/0565H01M2300/0082Y02E60/10
Inventor 许进宝陈扬陈雨欣肖文昊雷彩红
Owner GUANGDONG UNIV OF TECH
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