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Block copolymer and preparation method thereof, and all-solid-state copolymer electrolyte membrane and preparation method thereof

A technology of block copolymers and electrolyte membranes, which is applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, circuits, etc., can solve problems such as unfavorable production and processing short circuit hazards, weakened mechanical strength, etc., to achieve good control, controllable adjustment, The effect of improving ionic conductivity

Active Publication Date: 2020-08-14
MINNAN NORMAL UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above method can improve the mobility of the polymer chain segment, thereby increasing the ionic conductivity, but at the same time greatly weakens the mechanical strength, which is not conducive to actual production and processing and has the potential for short circuit

Method used

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  • Block copolymer and preparation method thereof, and all-solid-state copolymer electrolyte membrane and preparation method thereof
  • Block copolymer and preparation method thereof, and all-solid-state copolymer electrolyte membrane and preparation method thereof
  • Block copolymer and preparation method thereof, and all-solid-state copolymer electrolyte membrane and preparation method thereof

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preparation example Construction

[0042] The preparation method of the post-crosslinked all-solid copolymer electrolyte membrane of the present invention includes the following steps:

[0043] (1) 0.1-3.2 parts by weight of the reversible addition fragmentation chain transfer reagent is stirred and dissolved in 10-40 parts by weight of organic solvent, and then 10-40 parts by weight of AA is added and stirred and mixed; the reaction temperature is raised to 60-80°C , Keep stirring, deoxidize with nitrogen for 5-30 minutes, add 0.02-0.5 parts by weight of initiator, polymerize for 4-8 hours to obtain R-AA n1 -X polymer, R-AA n1 -X polymer is dispersed in an organic solvent in the form of molecular chains to form a transparent polymer solution;

[0044] (2) Add 10-80 parts by weight of PEGMA, 20-100 parts by weight of organic solvent and 0.02-0.5 parts by weight of initiator to the solution obtained in step (1), and continue the reaction for 8-20 hours to obtain R-AA n1 - b -PEGMA n2 -X block copolymer, R-AA n1 - b -P...

Embodiment 1

[0061] R-AA n1 -b-PEGMA n2 -b-AA n3 -X block copolymer, the designed molecular structure is 10K-40K-10K:

[0062] (1) 0.36 parts by weight of the reversible addition fragmentation chain transfer reagent was stirred and dissolved in 10 parts by weight of absolute ethanol, and then 10 parts by weight of 3-(trimethoxysilyl) propyl acrylate were added and stirred and mixed; the reaction temperature was increased To 70°C, keep stirring, purge nitrogen to remove oxygen for 15 minutes, add 0.03 parts by weight of azobisisocyanovaleric acid, and polymerize for 6 hours to obtain R-AA n1 -X polymer, R-AA n1 -X polymer is dispersed in an organic solvent in the form of molecular chains to form a transparent polymer solution;

[0063] (2) Add 40 parts by weight of poly(ethylene glycol) methyl ether acrylate, 40 parts by weight of absolute ethanol and 0.03 parts by weight of azobisisocyanovaleric acid to the solution obtained in step (1), and continue the reaction 14 hours, get R-AA n1 -b-PEGMA ...

Embodiment 2

[0069] R-AA n1 -b-PEGMA n2 -b-AA n3 -X block copolymer, the designed molecular structure is 5K-10K-5K:

[0070] (1) Stir and dissolve 3.2 parts by weight of reversible addition fragmentation chain transfer reagent in 40 parts by weight of anhydrous acetonitrile, then add 40 parts by weight of acrylic acid and stir and mix; increase the reaction temperature to 60°C, keep stirring, and remove nitrogen Oxygen for 30 minutes, 0.5 parts by weight of azobisisoheptonitrile was added, after 8 hours of polymerization, R-AA was obtained n1 -X polymer, R-AA n1 -X polymer is dispersed in an organic solvent in the form of molecular chains to form a transparent polymer solution;

[0071] (2) Add 80 parts by weight of poly(ethylene glycol) methacrylate, 100 parts by weight of anhydrous acetonitrile and 0.5 parts by weight of azobisisoheptonitrile to the solution obtained in step 1, and continue to react for 20 hours to obtain R-AA n1 -b-PEGMA n2 -X block copolymer, R-AA n1 -b-PEGMA n2 -X block co...

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Abstract

The invention relates to the field of lithium ion batteries, and particularly discloses a block copolymer for preparing an all-solid-state copolymer electrolyte membrane and a preparation method of the block copolymer. The block copolymer is an ABA type block copolymer, wherein the block A is a post-crosslinked block and is formed by polymerizing a monomer with a post-crosslinked functional group;and the block B is a conductive ionic block and is formed by polymerizing a conductive ionic monomer. The invention further discloses an all-solid-state copolymer electrolyte membrane prepared from the block copolymer and a preparation method of the all-solid-state copolymer electrolyte membrane. The ABA type block copolymer and a certain proportion of lithium salt are mixed and dissolved in an organic solvent, and chemical crosslinking is achieved through dehydration condensation reaction in the drying and membrane forming process so as to obtain the all-solid-state copolymer electrolyte membrane. The all-solid-state copolymer electrolyte membrane prepared by the method has good ionic conductivity and mechanical properties, and in a lithium iron phosphate all-solid-state battery, the specific discharge capacity of 140mAh / g is still kept after 100 circles of circulation at the discharge rate of 1C.

Description

Technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a block copolymer used for preparing an all-solid copolymer electrolyte membrane and a preparation method thereof, and an all-solid copolymer electrolyte membrane and a preparation method thereof. Background technique [0002] At present, commercial liquid lithium-ion batteries generally use organic carbonate solvents to dissolve lithium salts to form liquid electrolytes, so there are potential safety hazards such as easy leakage, inflammability, and explosion. Polymer electrolyte is a type of polymer film that can transmit lithium ions and effectively isolate the short circuit between the positive and negative electrodes. It can replace liquid electrolyte and diaphragm at the same time. Polymer electrolytes can be divided into two categories: all-solid electrolytes and gel-type electrolytes. The gel electrolyte needs to swell the liquid electrolyte in the polymer matrix, which c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F293/00C08J5/18C08L53/00H01M10/0565H01M10/058
CPCC08F293/005C08J5/18H01M10/0565H01M10/058C08F2438/03C08J2353/00Y02E60/10Y02P70/50
Inventor 黄杰郑哲楠黄子欣邓子祥苏墩厚李莹李施婷应丽莹
Owner MINNAN NORMAL UNIV