Modified organic silicon polymer, preparation method thereof and lithium secondary battery

A silicone and polymer technology, applied in the field of materials, can solve the problems of poor cycle stability and rapid capacity decay, and achieve the effect of maintaining integrity, inhibiting volume expansion effect, and having good application prospects.

Active Publication Date: 2021-04-02
SHENZHEN EUBO NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The object of the present invention is to provide a modified organosilicon polymer and its preparation method, a silicon-based negative electrode binder, and a lithium secondary battery , aiming to solve the technical problems existing in the existing silicon-based negative electrodes such as rapid capacity fading and poor cycle stability due to volume expansion

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  • Modified organic silicon polymer, preparation method thereof and lithium secondary battery
  • Modified organic silicon polymer, preparation method thereof and lithium secondary battery

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preparation example Construction

[0021] The embodiment of the present invention provides a method for preparing a modified silicone polymer, which includes the following steps:

[0022] S1. Provide side-chain hydrogen-containing silicone oil, modifiers, catalysts and organic solvents;

[0023] S2. Mixing side chain hydrogen-containing silicone oil, modifier, catalyst and organic solvent and performing hydrosilylation reaction to obtain a modified silicone polymer;

[0024] Wherein, the modifying agent contains at least one functional group among amino group, alkoxy group and carboxyl group.

[0025] In the embodiment of the present invention, the side-chain hydrogen-containing silicone oil and the modifier are subjected to hydrosilylation reaction under the action of a catalyst. Through this reaction, the amino, alkoxy or carboxyl functional groups on the modifier are grafted onto the Modified silicone polymers are obtained on silicone oil. The obtained modified silicone polymer is an elastomer with polysil...

Embodiment 1

[0045] This embodiment provides a method for preparing a modified organosilicon polymer and a lithium secondary battery, the steps are as follows:

[0046] At room temperature, 100 grams of hydrogen-containing silicone oil with a hydrogen content of 0.1% (molecular formula (CH 3 ) 3 SiO[(CH 3 ) 2 SiO] m [(CH 3 )(H)SiO] n Si(CH 3 ) 3 , m=121, n=10, the number average molecular weight is 10000), 19g of vinyltriethoxysilane (the molar equivalent ratio to the side chain hydrogen content of hydrogen-containing silicone oil is 1:1), 0.3g of platinum (0)-1,3-diethylene-1,1,3,3-tetramethyldisiloxane and 40g of toluene, mixed evenly under vigorous stirring, raised the temperature to 90°C, at this temperature Stir at reflux for 16h. After natural cooling, the product was distilled off under reduced pressure at 80° C. to remove the solvent to obtain the final product modified organosilicon polymer.

[0047] Mix 1.0g of the modified silicone polymer prepared above with 10g of N-...

Embodiment 2

[0049] This embodiment provides a method for preparing a modified organosilicon polymer and a lithium secondary battery, the steps are as follows:

[0050] At room temperature, 100 grams of hydrogen-containing silicone oil with a hydrogen content of 0.3% (molecular formula (CH 3 ) 3 SiO[(CH 3 ) 2 SiO] m [(CH 3 )(H)SiO] n Si(CH 3 ) 3 , m=176, n=45, the number average molecular weight is 15000), 68.4g of vinyltriethoxysilane (the molar equivalent ratio to the side chain hydrogen content of hydrogen-containing silicone oil is 1.2:1), 0.8g of Platinum (0)-1,3-diethylene-1,1,3,3-tetramethyldisiloxane and 60g of toluene were mixed evenly under vigorous stirring, and the temperature was raised to 110°C. Stirring under reflux for 24h. After natural cooling, the product was distilled off under reduced pressure at 80° C. to remove the solvent to obtain the final product modified organosilicon polymer.

[0051] 1.0 g of the modified organosilicon polymer was used to prepare a b...

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Abstract

The invention belongs to the technical field of materials, and particularly relates to a modified organic silicon polymer, a preparation method thereof and a lithium secondary battery. The preparationmethod comprises the following steps: carrying out a hydrosilylation reaction on side-chain hydrogen-containing silicone oil and a modifier under the action of a catalyst, and grafting amino, alkoxyor carboxyl functional groups on the modifier onto the hydrogen-containing silicone oil through the reaction to obtain the modified organosilicon polymer. The obtained modified organic silicon polymeris an elastomer containing amino, alkoxy or carboxyl functional groups on a side chain, not only has good bonding performance and self-healing performance, but also can interact with functional groups such as hydroxyl on the surface of a silicon-based negative electrode to form a self-healing three-dimensional cross-linked network, effectively inhibits the volume expansion effect of the silicon-based negative electrode active material, and maintains the integrity of the silicon-based negative electrode structure in the charging and discharging process, so that the cycling stability of the obtained lithium secondary battery is improved.

Description

technical field [0001] The invention belongs to the field of material technology, and in particular relates to a modified organosilicon polymer and a preparation method thereof, a silicon-based negative electrode binder, and a lithium secondary battery. Background technique [0002] With the depletion of non-renewable energy sources such as fossil fuels and the increasingly serious "greenhouse effect" of the earth, the development of new energy sources and the storage of green energy have become a hot research topic. In recent years, the booming electric vehicle market has a growing demand for improved performance of lithium-ion batteries, especially power lithium batteries with high energy density to improve cruising range. The development of new positive and negative lithium battery materials with higher energy density has become the main goal at present. The theoretical specific capacity of carbon anode materials currently in commercial use is 372mA·h / g. Silicon-based a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G77/388C08G77/38C08G77/12H01M4/62H01M10/0525
CPCC08G77/388C08G77/38C08G77/12H01M4/622H01M10/0525Y02E60/10
Inventor 岳风树方勇李士成童蓉岳树伟
Owner SHENZHEN EUBO NEW MATERIAL TECH
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