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Poly (1, 5-dioxepane-2-ketone)-based block polymer as well as preparation method and application thereof

A technology of dioxepane and block polymers, which is applied in the field of poly-based block polymers and its preparation, can solve the problems of low ionic conductivity and inability to meet the ionic conductivity of electrolytes, and achieve simple preparation process , Improve mechanical properties and thermal stability, wide electrochemical window effect

Active Publication Date: 2021-09-07
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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  • Poly (1, 5-dioxepane-2-ketone)-based block polymer as well as preparation method and application thereof
  • Poly (1, 5-dioxepane-2-ketone)-based block polymer as well as preparation method and application thereof
  • Poly (1, 5-dioxepane-2-ketone)-based block polymer as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] 1. First heat the Schlenk bottle with the magnet and vacuumize it, replace the nitrogen back and forth three times, and remove the water and air. Rapid addition of 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. React at 25°C for 6h, add a small amount of hydrochloric acid / methanol mixed solvent to terminate the reaction, use excess diethyl ether as a precipitating agent, and dry at room temperature to obtain poly(1,5-dioxepan-2-one homopolymer) ( PDXO 30 ).

[0058] 2. Add PDXO 30 (3g, 1mmol), 10mLCH 2 Cl 2 Add a three-necked flask placed in a low-temperature reactor at -5°C, and dissolve 2-bromoisobutyryl bromide (345 mg, 1.5 mmol) in 5 mL of CH 2 Cl 2 and added dropwise into the above-mentioned three-necked flask, reacted at -5°C for 2h after the dropwise addition, and then raised the t...

Embodiment 2

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

Embodiment 3

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

[0069] Characterize the performance of the block polymer electrolyte obtained in Examples 1-3, 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 PDXO block The room temperature ionic conductivity of the electrolyte increases as the content increases, indicating that the PDXO block in the PDXO-b-PS block polymer electrolyte is beneficial to Li + Transmission.

[0070] The performance of the block polymer electrolyte obtained in table 1 embodime...

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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-ketone)-based block polymer as well as a preparation method and application thereof. The poly (1, 5-dioxepane-2-ketone)-based block polymer is abbreviated as a PDXO-based block polymer, and the structure of the block polymer is shown as a formula (1), wherein R is shown in the specification, n = 1-500, m = 1-500, and x = 1-3. The synthesis process of the poly (1, 5-dioxepane-2-ketone)-based block polymer is convenient and feasible, and the prepared polymer has good interface stability, wide electrochemical window (greater than 4.5 V) and high room-temperature ionic conductivity (greater than 10 <-5 > Scm <-1 >) when being used as a lithium ion battery polyelectrolyte.

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-dioxepan-2-one)-based block polymer and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries play an increasingly important role in everyday life, from portable electronics and high-power power tools to electric vehicles. However, currently commercially used organic liquid electrolytes (LEs) cannot perfectly match Li metal anodes due to the overgrowth of Li dendrites and their high reactivity. In addition, the volatilization and leakage of LEs also poses a safety risk of fire or explosion, which can cause great damage, especially for batteries with high energy density. Solid-state electrolytes (SSEs) are the best choice to prevent Li dendrite overgrowth and electrolyte leakage, which is of great significance for the development of high energy density Li metal batteries. Compared with th...

Claims

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Application Information

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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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