Preparation method and application of succinonitrile-based double-layer composite polymer electrolyte

A double-layer composite, polymer technology, applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, secondary batteries, etc., can solve the problem of reducing battery energy density and cycle performance, unstable compatibility of lithium metal, low lithium ion transfer It can improve the performance, respond quickly, and reduce the interface resistance.

Pending Publication Date: 2021-08-24
杭州阳名新能源设备科技有限公司
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Problems solved by technology

However, low ion conductivity at room temperature, low lithium ion transfer number and narrow electrochemical window severely limit its practical application. In order to solve the above shortcomings, people have adopted various additives to reduce the crystallinity of PEO. It is worth noting that What is interesting is that although the presence of the additive can improve the poor interfacial contact with the electrode, it also leads to poor mechani

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  • Preparation method and application of succinonitrile-based double-layer composite polymer electrolyte
  • Preparation method and application of succinonitrile-based double-layer composite polymer electrolyte
  • Preparation method and application of succinonitrile-based double-layer composite polymer electrolyte

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[0042] The invention discloses a method for preparing a succinonitrile-based double-layer composite polymer electrolyte, using succinonitrile as a substrate, polyethylene oxide-bistrifluoromethanesulfonimide lithium and polyethylene glycol diacrylate-bistrifluoromethanesulfonimide Lithium fluoromethanesulfonimide-succinonitrile was used as a stable polymer electrolyte for negative and positive electrodes, respectively, and all experiments were performed in a glove box (H 2 O and O 2 <0.1ppm) under an argon atmosphere, the specific steps are as follows:

[0043] S1. Dry lithium bistrifluoromethanesulfonimide (LiTFSI) under vacuum conditions at 80-110°C for 24-72 hours;

[0044] S2. Dissolve succinonitrile (SN) and lithium bistrifluoromethanesulfonimide (LiTFSI) in polyethylene glycol diacrylate (PEGDA) solvent, add photoinitiator (CIBA) and heat to 50-80 ℃, and then continuously stirred for 24 to 72 hours, the prepared mixed solvent is the precursor of the photocurable polyme...

Embodiment 1

[0054] SN and LiTFSI were dissolved in PEGDA solvent under dark conditions in an argon atmosphere glove box, the mass ratio of PEGDA, LiTFSI and SN was kept at 1:2:2, the CIBA photoinitiator was 1wt%, and the configured PEGDA The solvent was heated to 50 ° C, and then continuously stirred for 24 hours to prepare a PEGDA-LiTFSI-SN (PLS) solution, which was used as a precursor solvent for a UV-curable polymer electrolyte;

[0055] Using the method of slurry casting and drying, a PEO polymer electrolyte membrane with a thickness of 10 μm was prepared, wherein the added lithium salt was LiTFSI, and the molar ratio of PEO to LiTFSI was 10:1;

[0056] The glass fibers were adhered to the PEO polymer electrolyte membrane, and excess PLS solvent was added, and pressed with a glass plate to ensure that the glass fibers were completely soaked for 2 hours; finally, the composite polymer electrolyte UCPE was obtained by UV curing for 5 minutes.

[0057] Schematic diagram of the structure ...

Embodiment 2

[0066] A certain amount of SN and LiTFSI were dissolved in PEGDA solvent in an argon atmosphere glove box under the condition of avoiding light, the mass ratio of PEGDA, LiTFSI and SN was kept at 1:2:2, and the CIBA photoinitiator was 1wt%. Heating to 50 ° C, and then continuously stirring for 24 hours to prepare a PEGDA-LiTFSI-SN (PLS) solution as a precursor solvent for UV-curable polymer electrolytes;

[0067] Then immerse the glass fiber in excess PLS solvent, and press it with a glass plate to ensure that the glass fiber is completely soaked for 2 hours. As a control group, this composite polymer electrolyte does not need to coat the PEO polymer electrolyte membrane; finally, it is cured by ultraviolet light for 7 minutes to obtain Photocurable monolayer composite polymer electrolyte. The LiTFSI was dried under vacuum at 100 °C for 48 h before use. All experiments were performed in a glove box (H 2 O and O 2 <0.1ppm) under an argon atmosphere.

[0068] The prepared li...

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Abstract

The invention discloses a preparation method and application of a succinonitrile-based double-layer composite polymer electrolyte, succinonitrile has good ionic conductivity and high oxidation stability, and electrolyte taking succinonitrile as a matrix can keep good stability with a metal lithium negative electrode. And high lithium ion conductivity can be maintained at the interface of the electrode, so that the charge-discharge efficiency can be ensured. The ionic conductivity of the composite polymer electrolyte at room temperature can reach 4.27 * 10 <-4 > S cm <-1 >, the electrochemical window width is 0-5.1 V (relative to Li < + >/Li), no short circuit phenomenon exists after the assembled metal lithium symmetrical battery is circulated for more than 250 hours, and the good flexibility of the polymer can enable all interfaces in the battery to be in close contact, so that the interface resistance is reduced. The electrolyte with the double-layer structure is a promising solid-state battery candidate electrolyte, a high-voltage positive electrode and a low-voltage metal negative electrode can coexist in the battery by utilizing the double-layer structure, and the development and commercialization of the solid-state secondary battery can be greatly accelerated by the brand new solid-state electrolyte design.

Description

technical field [0001] The invention belongs to the technical field of solid electrolytes, and in particular relates to a method for preparing a succinonitrile-based double-layer composite polymer electrolyte and an application thereof. Background technique [0002] With the continuous development of science and technology and the market, people's demand for large-capacity, high-density and miniaturized batteries is increasing. Traditional lithium-ion battery electrode materials have been difficult to meet people's needs in the field of electric vehicles and digital products. Therefore, scientific researchers High specific energy battery materials are being actively explored. Due to its high energy density and high safety, solid-state batteries are very suitable to meet the rapidly growing demand for higher battery capacity and stricter safety performance. Therefore, solid-state batteries have become the focus of the next generation of batteries and have attracted much atten...

Claims

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Application Information

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IPC IPC(8): H01M10/0565H01M10/058H01M10/052
CPCH01M10/0565H01M10/058H01M10/052Y02P70/50Y02E60/10
Inventor 韩晓刚刘通钱荣成樊兴
Owner 杭州阳名新能源设备科技有限公司
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