Solid electrolyte as well as preparation method and application thereof

A solid electrolyte and electrolyte technology, applied in the direction of electrolyte immobilization/gelation, circuits, electrical components, etc., can solve the problems of complex preparation methods and difficult industrialization, achieve good flexibility, inhibit the production of lithium dendrites, The effect of good thermal stability

Active Publication Date: 2020-12-04
EVE ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the preparation method involved in this invention is relatively complicated, and it is difficult to realize industrialization

Method used

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  • Solid electrolyte as well as preparation method and application thereof
  • Solid electrolyte as well as preparation method and application thereof
  • Solid electrolyte as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] This embodiment provides a solid electrolyte, which includes the following components: PEO-PPO-1, Li 1.4 Al 0.4 Ti 1.6 (PO 4 ) 3 , LiPON, Li 7 La 3 Zr 2 o 12 and LiBOB.

[0069] The preparation method of the solid electrolyte is as follows:

[0070] (1) Add 0.1g of Li 1.4 Al 0.4 Ti 1.6 (PO 4 ) 3 , 0.1g of LiPON and 0.1g of Li 7 La 3 Zr 2 o 12 Add in 8g of acetone, stir for 1h, wherein the rotating speed is 500 rpm, then add 1g of LiBOB and 0.8g of polyethylene glycol (M n =2000), continue stirring for 1h to obtain a mixed solution;

[0071] (2) 2g of PEO-PPO-1 (structure shown in formula I, n:m:k=93:6:1, weight average molecular weight of 100,000) was added to the mixed solution, stirred at room temperature for 2h, Then add 0.02g of dibenzoyl peroxide, stir and mix, and the rotating speed is 720 revolutions / min to obtain an electrolyte slurry;

[0072] (3) The electrolyte slurry was double-coated on the NKK cellulose separator, heated at a constant t...

Embodiment 2

[0075] This embodiment provides a solid electrolyte, which includes the following components: PEO-PPO-2, Li 10GeP 2 S 12 and LiTFSI.

[0076] The preparation method of the solid electrolyte is as follows:

[0077] (1) Add 0.3gLi 10 GeP 2 S 12 Add in 8g of acetonitrile, stir for 0.5h, wherein the rotating speed is 200 rev / min, then add 1gLiTFSI and 0.8g polyethylene glycol (M n =2000), continue stirring for 0.5h to obtain a mixed solution;

[0078] (2) Add 2g of PEO-PPO-2 (structure shown in formula I, n:m:k=93:6:1, weight average molecular weight is 50,000) into the mixed solution, stir at room temperature for 1h, and then Add 0.01 g of azobisisobutyronitrile, stir and mix at a speed of 200 rpm to obtain an electrolyte slurry;

[0079] (3) Coating the electrolyte slurry on one side of the PTFE membrane, heating at a constant temperature of 50°C for 10h, and then baking in a vacuum oven at 50°C for 10h to obtain the solid electrolyte.

[0080] The steps (1) to (3) are ...

Embodiment 3

[0082] This embodiment provides a solid electrolyte, which includes the following components: PEO-PPO-3, Li 9.54 Si 1.74 P 1.44 S 11.7 Cl 0.3 and LiBOB.

[0083] The preparation method of the solid electrolyte is as follows:

[0084] (1) Add 0.3g Li 9.54 Si 1.74 P 1.44 S 11.7 Cl 0.3 Add it into 8g of tetrahydrofuran, stir for 2h, and the rotation speed is 600 rpm, then add 1g of LiBOB and 0.8g of ethylene carbonate in sequence, and continue to stir for 2h to obtain a mixed solution;

[0085] (2) Add PEO-PPO-3 (structure shown in formula I, n:m:k=93:6:1, weight average molecular weight is 200,000) into the mixed solution, stir at room temperature for 3h, and then Add 0.02g of dibenzoyl peroxide, stir and mix, and the rotating speed is 950 rpm to obtain electrolyte slurry;

[0086] (3) The electrolyte slurry was double-coated on the PP separator, heated at a constant temperature of 70° C. for 15 hours, and then baked in a vacuum oven at 70° C. for 15 hours to obtain t...

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Abstract

The invention relates to a solid electrolyte as well as a preparation method and application thereof. The solid electrolyte comprises a cross-linked product of polyethylene oxide-polypropylene oxide containing unsaturated double bonds, and a lithium salt and an inorganic electrolyte which are coated in the cross-linked product. According to the solid electrolyte, the inorganic electrolyte is firstly used for filling a polymer matrix framework to improve the overall ionic conductivity, and then the chemical bond effect is used for initiating the polymer to realize crosslinking, so that the solid electrolyte with relatively high ionic conductivity, mechanical strength and thermal stability is obtained; and meanwhile, the solid electrolyte is simple in preparation method, low in cost, and easy in realization of large-scale production.

Description

technical field [0001] The invention relates to the field of battery materials, in particular to a solid electrolyte and its preparation method and application. Background technique [0002] Lithium-ion batteries account for an increasing proportion of electric vehicles, new energy vehicles and mobile electronic devices in modern society. The reason is that lithium-ion batteries have high capacity, strong stability, and fast charging and discharging. At present, it is very important to develop lithium-ion batteries with good safety and stable performance. Solid-state lithium battery is a widely recognized next-generation battery technology, the goal is to solve the needs of new energy vehicles for safety and long battery life. The rapid development of global new energy vehicles puts forward higher requirements for battery safety and energy density. The "Technology Roadmap for Energy Conservation and New Energy Vehicles" proposes to develop all-solid-state lithium battery te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/0525
CPCH01M10/0525H01M10/0565H01M2300/0085Y02E60/10
Inventor 黄科程冀亚娟许鑫鑫袁中直刘建华刘金成
Owner EVE ENERGY CO LTD
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