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Solid flame retardant polymer, electrode slice, diaphragm and lithium secondary battery

A technology for flame-retardant polymers and lithium secondary batteries, applied in secondary batteries, secondary battery repair/maintenance, lithium batteries, etc., can solve the negative impact of battery electrochemical performance, increase electrolyte viscosity, Reaction and other issues, to achieve the effects of unaffected cycle performance, improved battery safety, and excellent flame retardant performance

Active Publication Date: 2019-07-05
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, focusing on the use of high specific capacity and high voltage materials will inevitably bring about safety issues for liquid lithium secondary batteries
The electrolyte of lithium secondary batteries is mainly non-aqueous organic electrolyte (conventional carbonate electrolyte), when the battery is in a state of abuse (thermal shock, overcharge, acupuncture and external short circuit, etc.) , easy to burn and other hidden dangers, which can easily cause safety problems caused by battery thermal runaway
[0003] At present, the commonly used method to improve the safety of liquid lithium secondary batteries is to directly add flame retardant additives to conventional electrolytes. Although the addition of flame retardants can improve the flame resistance of the electrolyte, it will reduce the conductivity of the electrolyte and increase The viscosity of the electrolyte, and the flame retardant will have side reactions during the battery cycle, which has a certain negative impact on the electrochemical performance of the battery

Method used

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  • Solid flame retardant polymer, electrode slice, diaphragm and lithium secondary battery
  • Solid flame retardant polymer, electrode slice, diaphragm and lithium secondary battery
  • Solid flame retardant polymer, electrode slice, diaphragm and lithium secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] A kind of solid flame retardant polymer, its molecular structural formula is as shown in formula (A):

[0079]

[0080] The preparation of the solid flame-retardant polymer (polyethoxy (pentafluoro) cyclotriphosphazene) of the present embodiment:

[0081] Add 2.0 mol of hexafluorocyclotriphosphazene and 300 mL of acetonitrile into a 500 mL three-necked flask, and slowly add 1.0 mol of sodium ethylene glycol in acetonitrile mixture dropwise through a constant pressure dropping funnel at 0°C. , stirred and reacted at 40°C for 24 hours, filtered, and dried under reduced pressure to obtain polyethoxy(pentafluoro)cyclotriphosphazene (A), specifically n was 36.

[0082] Preparation of positive electrode sheet for lithium secondary battery:

[0083] Weighing 2% polyvinylidene fluoride (PVDF), 2% conductive agent super P, 2% solid flame-retardant polymer A and 94% lithium cobaltate (LiCoO 2 ), sequentially added to N-methylpyrrolidone (NMP), fully stirred and mixed evenly, t...

Embodiment 2

[0088] A kind of solid flame-retardant polymer, its molecular structural formula is as shown in formula (B):

[0089]

[0090] The solid flame retardant polymer (B) of this example can be prepared by a method similar to Example 1.

[0091] Add 1.0 mol of hexafluorocyclotriphosphazene and 200 mL of acetonitrile into a 500 mL three-necked flask, and slowly add 1.0 mol of sodium hydroquinone in acetonitrile mixture dropwise through a constant pressure dropping funnel at 0°C. Afterwards, stir and react at 60°C for 48 hours, filter, and dry under reduced pressure to obtain a solid flame-retardant polymer (B), specifically n 1 , n 2 , n 3 , n 4 Both are 12.

[0092] Preparation of positive electrode sheet for lithium secondary battery:

[0093] Weighing 2% polyvinylidene fluoride (PVDF), 2% conductive agent super P, 2% solid flame-retardant polymer B and 94% lithium cobaltate (LiCoO 2 ), sequentially added to N-methylpyrrolidone (NMP), fully stirred and mixed evenly, the sl...

Embodiment 3

[0098] A kind of solid flame retardant polymer, its molecular structural formula is as shown in formula (C):

[0099]

[0100] Preparation of the solid flame retardant polymer (polyethylene p-phenoxy (pentafluoro) cyclotriphosphazene) of the present embodiment:

[0101] Add 1.0mol hexafluorocyclotriphosphazene and 200mL acetonitrile respectively to a 500mL three-necked flask, and slowly add 1.0mol ethylene-p-phenol sodium acetonitrile mixture dropwise through a constant pressure dropping funnel at 0°C. , stirred and reacted at 30°C for 12 hours, filtered, and dried under reduced pressure to obtain the corresponding monomer ethylene-p-phenoxy (pentafluoro)cyclotriphosphazene. Then the corresponding monomer ethylene-p-phenoxy (pentafluoro)cyclotriphosphazene was dissolved in the acetonitrile solution containing the initiator (AIBN), polymerized at 60°C, and polyethylene-p-phenylene was obtained by dissolution-precipitation technology. Oxy(pentafluoro)cyclotriphosphazene (C),...

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Abstract

The embodiment of the invention provides a solid flame retardant polymer. The solid flame retardant polymer includes a repetitive unit containing a cyclotriphosphazene structure, the repetitive unit is formed by graft polymerization of monomers containing the cyclotriphosphazene structure, and the general formula is shown as formula (I) or formula (II), X is selected from alkylidene, alkylidene halide, alkyleneoxy, alkyleneoxy halide, alkenylene, alkenylene halide, alkenyleneoxy, alkenyleneoxy halide, arylene, arylene halide, aryleneoxy, aryleneoxy halide, substituted phosphite, substituted imido or substituted sulfonylimido; and Y is selected from oxygen, sulfur, alkylene, alkylene halides, alkylene halides, arylene halides, arylene halides, arylene halides, arylene halides, arylene halides, sulfonyl halides or sulfonyl imides; Y is selected from oxygen, sulfur, alkylidene, alkylidene halide, alkyleneoxy, alkyleneoxy halide, alkenylene, alkenylene halide, alkenyleneoxy, alkenyleneoxyhalide, arylene, arylene halide, aryleneoxy, aryleneoxy halide, substituted phosphite, substituted imido or substituted sulfonylimido. The invention also provides a lithium secondary battery electrodeslice, a diaphragm and a lithium secondary battery.

Description

technical field [0001] The invention relates to the technical field of lithium secondary batteries, in particular to a solid flame-retardant polymer, an electrode sheet, a diaphragm and a lithium secondary battery. Background technique [0002] Due to the advantages of high energy density, high working voltage, long service life, low self-discharge rate and environmental friendliness, lithium secondary batteries have been widely used in portable electronic products (smart phones, digital cameras, notebook computers, etc.), With the rapid development of new energy industries such as electric vehicles and large-scale energy storage grids, higher requirements are placed on the energy density of batteries. Among them, the development of high specific capacity positive and negative electrode materials and high voltage positive electrode materials is currently the key to improving lithium secondary batteries. The main technical means of energy density. However, focusing on the us...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G79/025C08F130/02H01M2/16H01M4/13H01M10/052H01M10/42H01M50/411
CPCC08G79/025C08F130/02H01M10/052H01M4/13H01M10/4235H01M50/411Y02E60/10
Inventor 马强李阳兴秦德君
Owner HUAWEI TECH CO LTD
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