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A kind of all-solid electrolyte and its preparation method and a kind of lithium battery

An electrolyte and all-solid-state technology, applied in secondary batteries, circuits, electrical components, etc., can solve problems such as low ion conductivity, low ion migration number, and low energy density, and achieve improved ion conductivity and high ion conductivity , the effect of wide electrochemical window

Active Publication Date: 2020-08-25
吉林省东驰新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, the performance of polymer electrolytes at this stage still has defects, such as a narrow electrochemical stability window (≤4V), which cannot be used with high-voltage positive electrode materials, and low energy density; the ionic conductivity of solid polymer electrolytes is relatively low compared to The liquid electrolyte is still very low; the ion migration number is low, resulting in large concentration polarization inside the battery, which affects the energy density and power density of the battery and other issues

Method used

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  • A kind of all-solid electrolyte and its preparation method and a kind of lithium battery
  • A kind of all-solid electrolyte and its preparation method and a kind of lithium battery
  • A kind of all-solid electrolyte and its preparation method and a kind of lithium battery

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preparation example Construction

[0031] In the present invention, the polycaprolactone-based block copolymer is preferably a self-made polycaprolactone-based block copolymer. In the present invention, the preparation method of the polycaprolactone-based block copolymer preferably comprises the following steps:

[0032] Mixing caprolactone, a hydroxyl-terminated polymer, a catalyst and a solvent to react to obtain a product system;

[0033] The obtained product system is dissolved in a polar solvent, then precipitated and purified with a non-polar solvent, and dried to obtain the polycaprolactone-based block copolymer.

[0034] In the invention, caprolactone, a hydroxyl-terminated polymer, a catalyst and a solvent are mixed and then reacted to obtain a product system. In the present invention, the hydroxyl-terminated polymer is specifically one or more of hydroxyl-terminated polytrimethylene carbonate, hydroxyl-terminated polyethylene oxide, and hydroxyl-terminated polypropylene carbonate, so Said solvent is...

Embodiment 1

[0055] Step 1: Dissolve 3g caprolactone and 1g hydroxyl-terminated polytrimethylene carbonate in 50mL toluene, and divalent tin compound Sn(Oct) 2 Add wherein according to 0.5% of the total mass.

[0056] Step 2: The above mixture was heated to 100° C. and stirred for 12 h.

[0057] Step 3: The crude product after the reaction was dissolved in tetrahydrofuran, and purified by reprecipitation with n-hexane.

[0058] Step 4: drying the purified product in a high-temperature vacuum oven at 60° C. for 15 hours to obtain polycaprolactone-polytrimethylene carbonate-polycaprolactone.

[0059] Step five: the synthesized polycaprolactone-polytrimethylene carbonate-polycaprolactone and LiPF 6 Added in anhydrous acetonitrile and stirred until uniform and poured on the porous cellulose diaphragm, the synthesized polycaprolactone-polytrimethylene carbonate-polycaprolactone and LiPF 6 The mass ratio of the anhydrous acetonitrile is 9:1, and the mass ratio of the volume of anhydrous aceto...

Embodiment 2

[0069] Step 1: Dissolve 3g caprolactone and 2g hydroxyl-terminated polypropylene carbonate in 100mL xylene, and divalent tin compound Sn(Oct) 2 Add wherein according to 0.5% of the total mass.

[0070] Step 2: The above mixture was heated to 120° C. and stirred for 48 hours.

[0071] Step 3: The crude product after the reaction was dissolved in tetrahydrofuran, and purified by reprecipitation with petroleum ether.

[0072] Step 4: drying the purified product in a high-temperature vacuum oven at 80° C. for 18 hours to obtain polycaprolactone-polypropylene carbonate-polycaprolactone.

[0073] Step 5: Add the synthesized polycaprolactone-polypropylene carbonate-polycaprolactone and LiTFSI into anhydrous acetonitrile and stir until evenly poured on the glass fiber diaphragm, the synthesized polycaprolactone-poly The mass ratio of propylene carbonate-polycaprolactone and LiTFSI is 8:2, and the mass ratio of the volume of anhydrous acetonitrile and polycaprolactone-polypropylene c...

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Abstract

The invention belongs to the solid electrolyte field, and provides an all-solid electrolyte which includes a polycaprolactone-based block copolymer, a lithium salt and a porous rigid material membrane, and the mass ratio of the polycaprolactone-based block copolymer and the lithium salt is (50-90): (10-50). As can be seen from the result of the example, the ionic conductivity of the all-solid electrolyte is 1.2x10<-5>-4.3x10<-4>S / cm, the electrochemical window reaches 4.5 ~ 5V and the lithium ion migration number reaches 0.4 ~ 0.6. The invention also provides a preparation method of the all-solid electrolyte. The preparation method of the invention has the advantages of simple operation, strong practicability and easy implementation. The invention also provides a lithium battery comprisingthe all-solid electrolyte or the all-solid electrolyte obtained by the preparation method.

Description

technical field [0001] The invention relates to the technical field of solid electrolytes, in particular to an all-solid electrolyte, a preparation method thereof, and a lithium battery. Background technique [0002] Lithium-ion batteries, a new type of electrochemical energy storage device, have received extensive attention and have been applied in various fields of life, such as smart phones, laptops, iPads and other 3C smart portable electronic devices and new energy electric vehicles. With the continuous growth of people's demand, the energy density requirements for lithium-ion batteries are also increasing, while the energy density of traditional electrolytes is close to the line. At the same time, due to the use of organic liquid electrolyte in traditional liquid lithium-ion batteries, there are potential safety hazards such as leakage, volatilization, and combustion, and the safety needs to be improved. Therefore, developing solid polymer lithium-ion batteries and re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0525H01M10/0562H01M10/0565
CPCY02E60/10
Inventor 谢海明张博皓丛丽娜刘军孙立群刘佳
Owner 吉林省东驰新能源科技有限公司
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