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Conductive polymer alkali metal salt with heat-sensitive properties and preparation method and application thereof

A technology of conductive polymers and alkali metal salts, applied in circuits, electrical components, battery electrodes, etc., can solve problems such as performance degradation and lack of ion conductivity, achieve easy operation, improve safety performance and electrochemical performance, and solve Effect of Security Questions

Active Publication Date: 2020-01-31
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of this, the first aspect of the embodiment of the present invention provides a conductive polymer alkali metal salt with heat-sensitive properties, which has excellent heat-sensitive properties, electron-conducting ability and ion-conducting ability, and it is used in secondary batteries , which can effectively improve the safety and electrochemical performance of the battery, to solve the problem that although the existing conductive polymer heat-sensitive materials can improve the safety of the battery to a certain extent, the cycle, rate and low temperature performance of the battery are caused by the lack of ion conductivity. Lowering the problem

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  • Conductive polymer alkali metal salt with heat-sensitive properties and preparation method and application thereof
  • Conductive polymer alkali metal salt with heat-sensitive properties and preparation method and application thereof
  • Conductive polymer alkali metal salt with heat-sensitive properties and preparation method and application thereof

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preparation example Construction

[0074] Correspondingly, an embodiment of the present invention also provides a method for preparing a conductive polymer alkali metal salt with heat-sensitive properties, comprising the following steps:

[0075] The polymer monomer is reacted at -40°C-100°C for 6-48 hours in the presence of anhydrous initiator and solvent, and the polymer monomer is polymerized to obtain a conductive polymer alkali metal with thermosensitive properties Salt, the polymer monomer includes a five-membered unsaturated heterocyclic structure and a substituted imine alkali metal salt on the five-membered unsaturated heterocyclic structure, the conductive polymer alkali metal salt includes a conductive polymer repeating unit and a substituted imine alkali metal salt grafted on the repeating unit of the conductive polymer, the conductive polymer repeating unit includes a five-membered unsaturated heterocyclic structure, and the substituted imine alkali metal salt includes a substituted imide base One ...

Embodiment 1

[0121] Using lithium poly(4-n-octyl substituted thiophene) (trifluoromethylsulfonyl)imide (as shown in formula (D)) to modify the current collector and apply it to lithium secondary batteries, the method is as follows:

[0122] (1) Preparation of poly(4-n-octyl substituted thiophene)(trifluoromethylsulfonyl)imide lithium (D), the synthetic route is shown in formula (6):

[0123] a) Add 0.5mol 3-bromo-4-n-octyl substituted thiophene, 1.1mol triethylamine and 500mL dichloromethane solvent to a 1000mL three-necked flask, slowly add 0.5mol trifluoromethylsulfonamide, stirred for 18 hours, filtered, and dried under reduced pressure to obtain (4-n-octyl substituted thiophene) (trifluoromethylsulfonyl)imide triethylamine salt;

[0124] b) Under the protection of argon, add 0.25mol (4-n-octyl substituted thiophene) (trifluoromethylsulfonyl)imide triethylamine salt and 250mL acetonitrile solvent to a 500mL three-necked flask respectively. Under conditions, add 0.5mol anhydrous lithium...

Embodiment 2

[0132] Using lithium poly(4-n-heptyl substituted furan)(hexafluoropropylsulfonyl)imide (as shown in formula (G)) to modify the current collector and apply it to lithium secondary batteries, the method is as follows:

[0133] (1) Preparation of poly(4-n-heptyl substituted furan)(hexafluoropropylsulfonyl)imide lithium (G), the synthetic route is shown in formula (7):

[0134] a) Add 0.5mol 3-bromo-4-n-heptyl substituted furan, 1.1mol triethylamine and 500mL dichloromethane solvent to a 1000mL three-necked flask, slowly add 0.5mol hexafluoropropylsulfonamide, stirred for 18 hours, filtered, and dried under reduced pressure to obtain (4-n-heptyl substituted furan) (hexafluoropropylsulfonyl)imide triethylamine salt;

[0135] b) Under the protection of argon, add 0.25mol (4-n-heptyl substituted furan) (hexafluoropropylsulfonyl)imide triethylamine salt and 250mL acetonitrile solvent to a 500mL three-necked flask respectively. Under the conditions, 0.5mol anhydrous lithium carbonate ...

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Abstract

The embodiment of the invention provides conductive polymer alkali metal salt with heat-sensitive properties. The metal salt comprises a conductive polymer repeating unit and substituted imine alkalimetal salt grafted on the conductive polymer repeating unit. The conductive polymer repeating unit includes a five-membered unsaturated heterocyclic structure. The substituted imine alkali metal saltincludes one or more of substituted imide alkali metal salt and substituted sulfimide alkali metal salt. The substituted imine alkali metal salt forms an N-C bond with C atoms in the five-membered unsaturated heterocyclic structure through N atoms. The conductive polymer alkali metal salt has excellent heat-sensitive properties, electron-conducting ability and ion-conducting ability. When used ina secondary battery, the conductive polymer alkali metal salt can effectively improve the safety and electrochemical performance of a battery and avoid the occurrence of thermal runaway. The embodiment of the invention further provides a preparation method and application of the conductive polymer alkali metal salt.

Description

technical field [0001] The invention relates to the technical field of secondary batteries, in particular to a conductive polymer alkali metal salt with heat-sensitive properties and a preparation method and application thereof. Background technique [0002] With the rapid development of science and technology, electronic consumer goods (mobile phones, digital cameras) and some professional electronic equipment are gradually developing towards miniaturization and portability, and the functions of use are constantly expanding. Higher requirements are put forward, but the safety issues of high energy density devices need to be solved urgently. At present, the electrolyte of the secondary battery is mainly non-aqueous organic electrolyte (conventional carbonate electrolyte), when the battery is abused (such as thermal shock, overcharge, acupuncture and external short circuit, etc.) Volatile, flammable and other hidden dangers can easily cause safety problems caused by battery ...

Claims

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Application Information

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IPC IPC(8): H01M4/60H01M10/0525
CPCH01M4/604H01M10/0525Y02E60/10
Inventor 马强李阳兴秦德君
Owner HUAWEI TECH CO LTD
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