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Battery silicon-carbon negative electrode composite adhesive as well as preparation method and application thereof

A composite adhesive and silicon carbon technology, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problem that adhesives cannot be applied to hydrophobic carbon coatings, etc.

Pending Publication Date: 2022-03-01
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The invention discloses a preparation method and application of a battery silicon-carbon negative electrode composite binder, which solves the problem that the existing binder cannot be applied to a hydrophobic carbon coating

Method used

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  • Battery silicon-carbon negative electrode composite adhesive as well as preparation method and application thereof
  • Battery silicon-carbon negative electrode composite adhesive as well as preparation method and application thereof
  • Battery silicon-carbon negative electrode composite adhesive as well as preparation method and application thereof

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preparation example Construction

[0051] The specific preparation method of the above battery silicon carbon negative electrode composite binder comprises the following steps:

[0052] Step 1, preparing 2-urea-4-[1H]methylpyrimidinone methacrylate (UPyMA) and 2-(1-pyrenebutyryloxy)ethyl methacrylate (PyBEMA);

[0053] Preparation of 2-urea-4-[1H]methylpyrimidinone methacrylate (UPyMA) specifically comprises the following steps:

[0054] 1.1. Add a certain amount of 2-amino-4-hydroxy-6-methylpyrimidine (UPy) into a certain volume of anhydrous dimethyl sulfoxide, and stir at 90°C-170°C for 10 minutes, wait for UPy After dissolving, the solution is cooled to room temperature to form a mixed solution C;

[0055] 1.2. Add 2-isocyanatoethyl methacrylate (ICEMA) into the mixed solution C to form a mixture D;

[0056] 1.3. Use an ice bath to rapidly cool the mixture D, and precipitate a white solid E after cooling;

[0057] 1.4. The solid E was collected and washed with excess acetone, and dried under vacuum at 30°...

Embodiment 1

[0083] The invention discloses a method for preparing a battery silicon-carbon negative electrode composite binder, which comprises the following steps:

[0084] (1) Add 2g of 2-amino-4-hydroxy-6-methylpyrimidine (UPy) into 50mL of anhydrous dimethyl sulfoxide, and stir at 90°C for 10 minutes. After UPy is dissolved, the solution is cooled to Room temperature and 3.224 g of 2-isocyanatoethyl methacrylate (ICEMA) was added to the flask;

[0085] The mixture was rapidly cooled using an ice bath, upon cooling a white solid precipitated;

[0086] The precipitate was collected and washed three times with excess acetone, and dried under vacuum at 30 °C for 4 hours to obtain the monomer 2-urea-4-[1H]methylpyrimidinone methacrylate (UPyMA) (90% conversion) .

[0087](2) 2.88 g of PyBA was dissolved in 30 mL of tetrahydrofuran (THF), and 2.16 g of DCC and 0.224 g of DMAP were added thereto. After stirring for 20 minutes, 1.95 g of HEMA was added to the above mixture. After stirring...

Embodiment 2

[0096] The invention discloses a method for preparing a battery silicon-carbon negative electrode composite binder, which comprises the following steps:

[0097] (1) Add 2g of 2-amino-4-hydroxy-6-methylpyrimidine (UPy) into 50mL of anhydrous dimethyl sulfoxide, and stir at 150°C for 10 minutes. After UPy is dissolved, the solution is cooled to Room temperature and 3.224 g of 2-isocyanatoethyl methacrylate (ICEMA) were added to the flask. The mixture was rapidly cooled using an ice bath, upon cooling a white solid precipitated. The precipitate was collected and washed three times with excess acetone, and dried under vacuum at 30 °C for 4 hours to obtain the monomer 2-urea-4-[1H]methylpyrimidinone methacrylate (UPyMA) (90% conversion) .

[0098] (2) 2.88 g of PyBA was dissolved in 30 mL of tetrahydrofuran (THF), and 2.16 g of DCC and 0.224 g of DMAP were added thereto. After stirring for 20 minutes, 1.95 g of HEMA was added to the above mixture. After stirring at room temper...

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Abstract

The invention belongs to the technical field of battery adhesives, and discloses a battery silicon-carbon negative electrode composite adhesive, and a preparation method of the battery silicon-carbon negative electrode composite adhesive comprises the following steps: preparing UPyMA and PyBEMA; the preparation method comprises the following steps: dissolving HEA, UPyMA and PyBEMA in DMF (Dimethyl Formamide) to form a solution I; adding an initiator into the solution I to form a solution J; freezing, vacuumizing, unfreezing and deoxidizing the solution J, and carrying out polymerization reaction in an oil bath pan to obtain a polymer; cooling in an ice bath to terminate the reaction, dialyzing and purifying the polymer, and freeze-drying to obtain a triblock copolymer; and mixing and stirring polyacrylic acid and the triblock copolymer to obtain the battery silicon-carbon negative electrode composite adhesive. The adhesive provided by the invention has high adhesive force, good ionic conductivity and excellent interfacial compatibility, improves the capacity retention ratio and cycling stability under high-current multiplying power and high-quality load, and broadens the practical application of the lithium ion battery.

Description

technical field [0001] The invention belongs to the technical field of battery adhesives, and in particular relates to a battery silicon-carbon negative electrode composite adhesive and a preparation method and application thereof. Background technique [0002] With the continuous development of multifunctional mobile electronic devices and electric vehicles, there is an increasing demand for the energy density of lithium-ion batteries. With its high theoretical capacity (4200mAh / g), low lithium extraction potential, wide source, non-toxic and other characteristics, silicon is generally considered to be a substitute for the negative electrode of the next generation of lithium-ion batteries. To further advance its commercialization, the researchers utilized various advanced silicon-based materials fabrication strategies. Among them, silicon-carbon composite (Si / C) engineering has achieved promising results by enhancing electronic conductivity and alleviating the volume chang...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M10/0525
CPCH01M4/622H01M4/623H01M10/0525Y02E60/10
Inventor 宋江选张永
Owner XI AN JIAOTONG UNIV
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