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Multi-block copolymer and polymer electrolyte

A multi-block copolymer and polymer technology, which is applied in the field of polymer electrolyte materials, can solve the long-term durability requirements and industrial applications of lithium-ion batteries without materials, which cannot meet the requirements of electrolyte thin films, poor mechanical properties of polymer electrolyte membranes, etc. question

Active Publication Date: 2015-06-03
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, as described in Journal of Power Sources, 2005 (146) 386-390, only when the segment A content is higher than 70%, the triblock copolymer can obtain the co-continuous phase morphology, and at this time the segment B content Too low, resulting in poor mechanical properties of the polymer electrolyte membrane
[0007] In summary, the polymer electrolyte materials in the current technology cannot meet the dual requirements of the electrolyte film for lithium ion conductivity and mechanical properties, so that there is no material that can meet the long-term durability requirements and industrial applications of lithium-ion batteries.

Method used

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  • Multi-block copolymer and polymer electrolyte

Examples

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Embodiment 1

[0088] Example 1 (Preparation of A-B-A-B type tetrablock copolymer and corresponding polymer electrolyte, wherein poly(poly(ethylene glycol) methyl ether methacrylate) (expressed as P(PEGMA)) is used as segment A and the use of polystyrene (denoted PS) as segment B)

[0089] (1) Synthesis of Segment A

[0090] Add 15.5 g poly(ethylene glycol) methyl ether methacrylate (PEGMA-1, M n =980, m=20, 15.8mmol) and in N 2 Dissolve under atmosphere. Then 45.3 mg (0.316 mmol) CuBr and 98.65 mg (0.732 mmol) bpy were added to the solution. After stirring well for 10 minutes, 57.2 mg (0.316 mmol) of ethyl 2-bromopropionate was added, and the temperature was raised to 90°C. After 30 hours of polymerization, the reaction system was immediately cooled in an ice / water bath to terminate the reaction. The solution was then diluted with THF and passed through Al 2 o 3 The column was purified to remove the catalyst / ligand complex. After removing the solvent, the reaction product was washed...

Embodiment 2

[0103] Example 2 (Preparation of A-B-A-B-A type pentablock copolymer and corresponding polymer electrolyte, wherein P (PEGMA) is used as segment A and PS is used as segment B)

[0104] The P(PEGMA)-b-PS-b-P(PEGMA)-b-PS tetrablock copolymer (A-B-A-B type) prepared in Example 1 was used as a macroinitiator to prepare a pentablock copolymer.

[0105] (1) Synthesis of A-B-A-B-A type pentablock copolymer

[0106] Under an argon atmosphere, 10.92 mg (0.075 mmol) of CuBr and 23.77 mg (0.15 mmol) of bpy were added to 5.2 ml of toluene to form a reaction system. After stirring for 10 minutes, a catalyst / ligand complex was formed. Add 3.13g (3.0mmol) PEGMA-1 (M n =980, m=20), stirring and dissolving was continued for 15 minutes under an argon atmosphere. Next, the reaction system was sealed, and after the macromolecular initiator was completely dissolved, the reaction temperature was raised to 90°C. Polymerization was carried out for 100 hours. Immediately thereafter, the reaction ...

Embodiment 3

[0114] Example 3 (Preparation of A-B-A-B-A type pentablock copolymer and corresponding polymer electrolyte, wherein P (PEGMA) is used as segment A and PS is used as segment B)

[0115] (1) Synthesis of Segment A

[0116] In 25ml toluene, add 18.0g PEGMA-2 (M n =450, m=8, 40.0mmol) and in N 2 Dissolve under atmosphere. Then 57.34 mg (0.40 mmol) CuBr and 107.82 mg (0.80 mmol) bpy were added to the solution. After stirring well for 10 minutes, 75.57 mg (0.40 mmol) of 2,2-dichloroacetophenone was added, and the temperature was raised to 90°C. After 25 hours of polymerization, the reaction system was immediately cooled in an ice / water bath to terminate the reaction. The solution was then diluted with THF and passed through Al 2 o 3The column was purified to remove the catalyst / ligand complex. After removing the solvent, the reaction product was washed with anhydrous diethyl ether to remove unreacted monomers to obtain refined P(PEGMA)-2. M of P(PEGMA)-2 n 6000 and molecula...

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Abstract

The present invention provides a multi-block copolymer with polyoxyethylene unit in side chain and a polymer electrolyte containing the multi-block copolymer. Since the multi-block copolymer has a number of block of larger than 3, it can completely avoid crystallization and is easier to has phase separation morphology, especially co-continuous phase morphology, and thus has better performance. For the polymer electrolyte, co-continuous phase morphology can be achieved in a wide range of segment A content. The polymer electrolyte of the present invention is thus greatly improved in ionic conductivity and mechanical properties.

Description

technical field [0001] The invention relates to a multi-block copolymer and a polymer electrolyte material for a lithium ion secondary battery. Background technique [0002] Lithium-ion battery is a promising green chemical power source with higher energy density, higher output voltage and shorter charging time than other secondary batteries, and thus has significant economic and social benefits. Among the electrolytes of lithium-ion secondary batteries, liquid electrolytes are conventionally used. However, liquid electrolytes are prone to leakage, which can cause safety issues and affect the stability in long-term use. [0003] Currently, the most promising solution is to use solid electrolyte materials, such as inorganic electrolytes or polymer electrolytes (solid), instead of liquid electrolytes. Inorganic solid electrolytes have the highest lithium ion conductivity among solid electrolyte materials. However, it has the disadvantages of difficult processing and high in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F297/06
CPCC08F293/005C08F2438/01
Inventor 杨扬范少夫陈桥吴刚出原大辅梅田浩明
Owner TORAY IND INC
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