Photo-crosslinking stabilized hyperbranched free radical polymer and preparation method and application thereof

A free radical and stabilization technology, applied in the direction of electrical components, circuits, battery electrodes, etc., can solve the problems of machinability, non-rechargeable battery life, etc., achieve good mechanical properties, avoid battery life decline, molecular weight and the effect of increasing the glass transition temperature

Active Publication Date: 2018-04-06
广州新驰化工科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Mixing PTMA with carbon materials to prepare polymer composite electrodes can significantly improve the electrochemical activity, but such organic electrode composites often have the disadvantage of reduced battery life due to polymer dissolution in the electrolyte, or even non-rechargeable. Compounding by adding crosslinking agent or binder also has adverse effects on electrodes; in addition, when such linear polymers have a large molecular weight, their dispersibility when compounded with carbon materials is poor, making their processability difficult. affected

Method used

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  • Photo-crosslinking stabilized hyperbranched free radical polymer and preparation method and application thereof
  • Photo-crosslinking stabilized hyperbranched free radical polymer and preparation method and application thereof
  • Photo-crosslinking stabilized hyperbranched free radical polymer and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] 1. Preparation method

[0046] A photocrosslinkable stabilized hyperbranched free radical polymer prepared by the following method:

[0047] (1) Add 1.624g of 2,2,6,6-tetramethyl-4-piperidinyl methacrylate and 0.208g of methacryloyloxyethyl cinnamate in sequence to a 20mL dry ammeter tube , 0.16g of ethylene glycol dimethacrylate, 44.4mg of 4-cyano-4-(propyl trithiocarbonate)-pentanoic acid and 5.2mg of azobisisobutyronitrile (ie its mole ratio of 90:10:10:2:0.4), and 8 mL of tetrahydrofuran as a solvent, nitrogen was passed through to remove oxygen, and the tube was sealed in vacuum. After the reaction was continued for 18 h under heating at 60° C., the reaction solvent was removed by rotary evaporation to obtain the hyperbranched polymer hb-poly(TMPM-co-CEMA).

[0048] (2) Get 1g of gained hyperbranched polymer and 0.854g m-chloroperoxybenzoic acid (i.e. the mol ratio of piperidinyl unit and m-chloroperoxybenzoic acid is 1:1.1), be dissolved in 250mL dichloromethane...

Embodiment 2

[0054] 1. Preparation method

[0055] According to the same preparation method as in Example 1, but the feeding was changed to 1.624g of 2,2,6,6-tetramethyl-4-piperidinyl methacrylate, 0.208g of methacryloxyethyl cinnamon ester, 40 mg of ethylene glycol dimethacrylate, 44.4 mg of 4-cyano-4-(propyltrithiocarbonate)-pentanoic acid and 5.2 mg of azobisisobutyronitrile, which The molar ratio is 90:10:2.5:2:0.4. After post-treatment under the same conditions as in Example 1, a hyperbranched radical polymer (hb-2) capable of photocrosslinking and stabilization was obtained.

[0056] 2. Product characteristics and physical and chemical properties

[0057] (1) if figure 2 As shown, the glass transition temperature of the obtained photocrosslinkable and stabilized hyperbranched radical polymer (hb-2) is 124.48°C.

[0058] (2) Using the same method as in Example 1 to prepare an electrode, the measured electrode capacity is 83mAh, and the coulombic efficiency is nearly 100% and the ...

Embodiment 3

[0060] 1. Preparation method

[0061] According to the same preparation method as in Example 1, but the feeding was changed to 1.624g of 2,2,6,6-tetramethyl-4-piperidinyl methacrylate, 0.208g of methacryloxyethyl cinnamon ester, 16 mg of ethylene glycol dimethacrylate, 44.4 mg of 4-cyano-4-(propyltrithiocarbonate)-pentanoic acid and 5.2 mg of azobisisobutyronitrile, which The molar ratio is 90:10:1:2:0.4. After post-treatment under the same conditions as in Example 1, a hyperbranched radical polymer (hb-3) capable of photocrosslinking stabilization was obtained.

[0062] 2. Product characteristics and physical and chemical properties

[0063] (1) if figure 2 As shown, the glass transition temperature of the obtained photocrosslinkable and stabilized hyperbranched radical polymer (hb-3) is 113.03°C.

[0064] (2) Using the same method as in Example 1 to prepare an electrode, the measured electrode capacity is 86mAh, and the coulombic efficiency is nearly 100% and the capaci...

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Abstract

The invention discloses a photo-crosslinking stabilized hyperbranched free radical polymer and a preparation method and application thereof. 2,2,6,6-tetramethyl-4-piperidyl methacrylate, a photo-crosslinked monomer and a branched monomer are subjected to free radical polymerization and then an oxidation reaction, and the hyperbranched free radical polymer is obtained. The polymer has a structure unit which can be ultraviolet photo crosslinked, after the structure is compounded with carbon materials, stabilization of in situ photo crosslinking can be achieved, the situation that the polymer isdissolved out in electrolyte, the service life is thus shortened and repeated charging is not allowed, the cycling stability of a battery is improved, no additional crosslinking agent or binder needsto be added, the adverse effects of adding materials on an electrode are avoided, moreover, the polymer has the hyperbranched structure which can be crosslinked, the dispersing performance is good, meanwhile the molecular weight and the glass transition temperature are significantly improved, the mechanical properties are good, and the application prospect is wide.

Description

technical field [0001] The invention belongs to the technical field of polymer materials. More specifically, it relates to a photocrosslinkable and stabilized hyperbranched free radical polymer, its preparation method and application. Background technique [0002] Lithium-ion batteries are widely used as power sources for mobile electronic devices due to their high energy density and long service life. With the continuous development of technology, the application range of lithium-ion batteries has gradually expanded to electric vehicles and energy storage. Among them, since the lithium transition metal oxide positive electrode is the main part of the lithium battery, the properties of the oxide mainly determine the energy density and capacity of the entire battery. [0003] As we all know, the safety and resource availability of lithium transition metal oxides have existed for a long time. At present, organic radical polymers with higher theoretical specific capacity, bet...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F8/06C08F220/36C08F220/40C08F222/14H01M4/36
CPCC08F8/06C08F220/36C08F2438/03H01M4/364C08F220/40C08F222/102Y02E60/10
Inventor 秦何荣卢江章自寿黄建兵梁晖
Owner 广州新驰化工科技有限公司
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