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Porous polybenzimidazole polymer electrolyte membrane, and preparation method and application thereof

An electrolyte separator, polybenzimidazole technology, applied in circuits, electrical components, battery pack components, etc., can solve problems such as expanding short-circuit areas, battery combustion, explosion, etc., achieving good application prospects, inhibiting growth, and excellent thermal stability. sexual effect

Inactive Publication Date: 2019-06-18
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, commercial microporous polyolefin separators such as polyethylene (PE) and polypropylene (PP) show severe thermal dimensional shrinkage at high temperature (>100–150 °C), enlarging the short-circuit area and causing the battery to burn or even explode.

Method used

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  • Porous polybenzimidazole polymer electrolyte membrane, and preparation method and application thereof
  • Porous polybenzimidazole polymer electrolyte membrane, and preparation method and application thereof
  • Porous polybenzimidazole polymer electrolyte membrane, and preparation method and application thereof

Examples

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Embodiment 1

[0030] A preparation method of a porous polybenzimidazole polymer electrolyte membrane (wp-PBIPE) applicable to high-performance and high-safety lithium metal batteries, comprising the following steps:

[0031] (1) Preparation of uniform film-forming solution.

[0032] This step is specifically: dissolving polybenzimidazole (PBI) in DMAc at room temperature to prepare a 12.5 wt% uniform solution.

[0033] (2) The porous polybenzimidazole polymer electrolyte separator was prepared by a non-solvent induction process.

[0034] This step is specifically as follows: spread a uniform solution of PBI with a concentration of 12.5wt% on a glass plate to form a solution film with an average thickness of 30-40 μm, and then immediately immerse it in water to achieve a phase inversion process within ten minutes; after that, the diaphragm Dry at room temperature for 12 hours, and then dry at 80°C for 24 hours under reduced pressure to prepare a porous polybenzimidazole polymer electrolyte ...

Embodiment 2

[0037] A preparation method of a porous polybenzimidazole polymer electrolyte membrane (ep-PBIPE) applicable to high-performance and high-safety lithium metal batteries, comprising the following steps:

[0038] (1) Preparation of uniform film-forming solution.

[0039] This step is specifically: dissolving polybenzimidazole (PBI) in DMAc at room temperature to prepare a 12.5 wt% uniform solution.

[0040] (2) The porous polybenzimidazole polymer electrolyte separator was prepared by a non-solvent induction process.

[0041] This step is specifically as follows: the uniform solution of PBI with a concentration of 12.5wt% is spread on a glass plate into a solution film with an average thickness of 30-40 μm, then immediately immersed in ethanol, and the phase inversion process is realized within ten minutes; after that, the The separator was dried at room temperature for 12 hours, and then dried at 80°C for 24 hours under reduced pressure to prepare a porous polybenzimidazole po...

Embodiment 3

[0044] A preparation method of a porous polybenzimidazole polymer electrolyte diaphragm (ap-PBIPE) applicable to high-performance and high-safety lithium metal batteries, comprising the following steps:

[0045] (1) Preparation of uniform film-forming solution.

[0046] This step is specifically as follows: dissolving polybenzimidazole (PBI) in DMAC at room temperature to prepare a 12.5 wt% uniform solution.

[0047] (2) The porous polybenzimidazole polymer electrolyte separator was prepared by a non-solvent induction process.

[0048]This step is specifically as follows: spread a uniform solution of PBI with a concentration of 12.5wt% on a glass plate to form a solution film with an average thickness of 30-40 μm, then immediately immerse it in ethyl acetate, and realize the phase inversion process within ten minutes; after that , the membrane was dried at room temperature for 12 hours, and then dried at 80°C for 24 hours under reduced pressure to prepare a porous polybenzimi...

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Abstract

The invention discloses a porous polybenzimidazole polymer electrolyte membrane, and a preparation method and an application thereof, and belongs to the technical field of advanced lithium ion batteries. According to the preparation method disclosed by the invention, a porous membrane having high porosity, high solvent absorption, rapid electrolyte wetting and high mechanical strength is preparedby a rapid non-solvent induced phase inversion method (NIPS). A membrane material adopts highly rigid and fully aromatic polybenzimidazole (PBI), electron-rich nitrogen atoms on imidazole rings in PBImolecules can form a coordination function with lithium ions, thereby improving the conductivity and the migration number of the lithium ions, and the growth of lithium dendrites can also be effectively inhibited. The porous polybenzimidazole polymer electrolyte membrane prepared by the preparation method disclosed by the invention has a very good application prospect in polymer lithium metal batteries.

Description

technical field [0001] The invention relates to the technical field of advanced lithium-ion batteries, in particular to a porous polybenzimidazole polymer electrolyte diaphragm, a preparation method and application thereof. Background technique [0002] Since the high energy density of commercial lithium-ion batteries is limited by the theoretical capacity of carbon anode materials, the development of high-capacity anode materials is currently considered to be one of the biggest challenges for next-generation energy sources. In the past few decades, lithium metal has been increasingly used as a battery anode material because of its highest specific capacity of 3860 mA h / g and lowest anode potential of -3.04 V compared to standard hydrogen electrodes. s concern. Unfortunately, Li metal is still severely affected by Li dendrite growth generated by uneven Li deposition on the Li metal surface, which leads to short cycle life, low Coulombic efficiency, and even serious safety i...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16
CPCY02E60/10
Inventor 张运丰王佳颖
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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