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A kind of preparation method of thermally cross-linkable polymer electrolyte membrane for lithium battery

A technology of cross-linked polymer and electrolyte membrane, which is used in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, battery pack components, etc. The effects of controlled growth, fast polymerization speed and wide range of monomer composition

Active Publication Date: 2018-05-08
ZHEJIANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The room temperature ionic conductivity of all solid electrolytes is less than 10 -4 S / cm, which limits its production application
However, the current industrial methods for regulating the molecular chain structure of polymers are basically ionic polymerization. The reaction conditions are harsh and the range of applicable monomers is small, so it is impossible to synthesize gradient copolymers with polar groups.

Method used

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  • A kind of preparation method of thermally cross-linkable polymer electrolyte membrane for lithium battery
  • A kind of preparation method of thermally cross-linkable polymer electrolyte membrane for lithium battery
  • A kind of preparation method of thermally cross-linkable polymer electrolyte membrane for lithium battery

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Effect test

preparation example Construction

[0022] The preparation method of the heat-crosslinkable polymer electrolyte membrane of the present invention comprises the following steps:

[0023] (1) 0.5-2.6 parts by weight of amphiphilic macromolecular reversible addition fragmentation chain transfer reagent is stirred and dissolved in 30-80 parts by weight of water to form an aqueous phase, and then mixed with 7.6-19 parts by weight of St and 0.076-0.95 parts by weight The oil phase composed of parts Ip is poured into the reactor together and stirred and mixed; the reaction temperature is raised to 60-80 ° C, kept stirring, nitrogen deoxygenation is carried out for 5-30 minutes, and 0.005-0.05 parts by weight of water-soluble initiator is added to polymerize After 1-2 hours, get R-AA n1 -b-St n2 -b-(St-co-Ip) n3 -X block copolymer, R-AA n1 -b-St n2 -b-(St-co-Ip) n3 -X block copolymers are stably dispersed in water in the form of particles to form latex;

[0024] (2) Add 13-30 parts by weight of MA monomer and 25-5...

Embodiment 1

[0049] R-AA n1 -b-St n2 -b-(St-co-Ip) n3 -b-MA n4 -b-(St-co-Ip) n5 -X block copolymer, wherein (St-co-Ip) n3 -b-MA n4 -b-(St-co-Ip) n5 The designed molecular structure of the block copolymer is 25K-40K-25K, and the monomer mass ratio of St to Ip is 100:1:

[0050] (1) 1.0 parts by weight of the amphiphilic macromolecular reversible addition fragmentation chain transfer reagent is stirred and dissolved in 40 parts by weight of water to form a water phase, and then poured together with the oil phase consisting of 10 parts by weight of St and 0.1 parts by weight of Ip Stir in the reactor to mix. Raise the reaction temperature to 70°C, keep stirring, pass nitrogen to remove oxygen for 15 minutes, add 0.024 parts by weight of a water-soluble initiator, and polymerize for 1.5 hours to obtain R-AA n1 -b-St n2 -b-(St-co-Ip) n3 -X block copolymer, R-AA n1 -b-St n2 -b-(St-co-Ip) n3 The -X block copolymer is stably dispersed in water in the form of particles to form a latex....

Embodiment 2

[0061] R-AA n1 -b-St n2 -b-(St-co-Ip) n3 -b-MA n4 -b-(St-co-Ip)n5 -X block copolymer, wherein (St-co-Ip) n3 -b-MA n4 -b-(St-co-Ip) n5 The designed molecular structure of the block copolymer is 17K-30K-17K, and the monomer mass ratio of St to Ip is 100:1:

[0062] (1) 2.4 parts by weight of the amphiphilic macromolecular reversible addition fragmentation chain transfer reagent is stirred and dissolved in 40 parts by weight of water to form a water phase, and then poured together with the oil phase consisting of 10 parts by weight of St and 0.1 parts by weight of Ip Stir in the reactor to mix. Raise the reaction temperature to 70°C, keep stirring, pass nitrogen to remove oxygen for 25 minutes, add 0.046 parts by weight of a water-soluble initiator, and polymerize for 2 hours to obtain R-AA n1 -b-St n2 -b-(St-co-Ip) n3 -X block copolymer, R-AA n1 -b-St n2 -b-(St-co-Ip) n3 The -X block copolymer is stably dispersed in water in the form of particles to form a latex.

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Abstract

The invention discloses a method for preparing a heat-crosslinkable polymer electrolyte membrane. In the method, a styrene / isoprene / methyl acrylate block copolymer is dissolved in a volatile organic solvent, dried to form a film, and then The film is immersed in an electrolyte solution containing a thermal initiator to obtain a thermally crosslinkable polymer electrolyte membrane. The invention adopts an emulsion polymerization system and utilizes a reversible addition-fragmentation chain transfer radical polymerization technology to prepare a styrene / isoprene / methyl acrylate block copolymer, which has a wide molecular weight range of the polymer and a wide monomer composition range. The heat-crosslinkable polymer electrolyte membrane can reach a discharge specific capacity of 154mAh / g in a lithium iron phosphate half-cell, and has great application value.

Description

technical field [0001] The invention relates to the fields of polymer material technology and lithium-ion batteries, in particular to a heat-crosslinkable polymer electrolyte membrane and a preparation method thereof. Background technique [0002] Polymer electrolyte has strong plasticity, no hidden danger of liquid leakage, non-combustibility, high energy density, can replace liquid electrolyte and separator at the same time, and reduce the interface impedance with electrodes, so it has broad application prospects. Polymer electrolytes can be divided into all-solid electrolytes and gel-type electrolytes. The room temperature ionic conductivity of all solid electrolytes is less than 10 -4 S / cm, which limits its production application. As an intermediate product between liquid electrolyte and all-solid electrolyte, the polymer gel electrolyte has an ion conductivity of up to 10 at room temperature. -3 S / cm. [0003] The matrix of polymer gel electrolytes is mostly a homop...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/14H01M10/058H01M50/403H01M50/411H01M50/497
CPCH01M10/058H01M50/403Y02E60/10Y02P70/50
Inventor 郑哲楠黄杰高翔王永常罗英武
Owner ZHEJIANG UNIV
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