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A room temperature solid polymer electrolyte and its preparation method, electrode/electrolyte composite and its preparation method and application

A technology of solid polymers and electrolytes, applied in the field of lithium-ion batteries, can solve problems such as potential safety hazards, restrictions on Li+ degrees of freedom, and inapplicability to mass production, and achieve the effect of improving mechanical properties

Active Publication Date: 2021-09-24
吉林省东驰新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. At room temperature, PEO is a semi-crystalline solid with extremely low ionic conductivity (10 -7 S / cm), hindering the development of room temperature PEO-based solid-state lithium metal batteries;
[0005] 2. PEO main chain ether oxygen and Li + The interaction force is strong, limiting the Li + degrees of freedom
However, the addition of plasticizers still has potential safety hazards caused by solvent extrusion under conditions such as extrusion, and the synthesis of single-ion conductors is often complicated and not suitable for mass production; Conductivity improvement has little effect

Method used

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  • A room temperature solid polymer electrolyte and its preparation method, electrode/electrolyte composite and its preparation method and application
  • A room temperature solid polymer electrolyte and its preparation method, electrode/electrolyte composite and its preparation method and application
  • A room temperature solid polymer electrolyte and its preparation method, electrode/electrolyte composite and its preparation method and application

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preparation example Construction

[0051] The present invention also provides a method for preparing a room temperature solid polymer electrolyte described in the above technical solution, comprising the following steps:

[0052] (1) mixing lithium salt, polyethylene oxide, crosslinking agent, additive and photoinitiator to obtain a precursor blend;

[0053] (2) After casting the precursor blend solution on the substrate, cover the film of polyethylene terephthalate, and perform hot-press melting and cooling in sequence to obtain a solid electrolyte precursor;

[0054] (3) The solid electrolyte precursor is irradiated with ultraviolet light to remove the substrate and the polyethylene terephthalate film to obtain a solid polymer electrolyte at room temperature.

[0055] In the present invention, all the preparation raw materials are consistent with the components in the above-mentioned technical solution, and will not be repeated here.

[0056] The invention mixes lithium salt, polyethylene oxide, crosslinking...

Embodiment 1

[0070] Weigh PEO according to the mass ratio of 1:1:1 (M w =10000g / mol), PEGDMA (M w =750g / mol), poly(oxyethylene siloxane)-[(CH 2 -CH 2 -O-CH 2 -CH 2 -O) 2 SiO] 2 -(M w =440g / mol), and with -EO-: Li + Weigh LiTFSI with a molar ratio of 20:1, stir the above materials for 12 hours to mix them evenly, then add the photoinitiator HMPP weighed at 3% of the total mass of the solid polymer electrolyte at room temperature, stir and mix the above materials and let stand for 6 hours , to obtain a homogeneous precursor blend;

[0071] Precursor blend liquid according to 5mg / cm 2 The casting amount is cast on the PTFE substrate, and heated at 80°C for 20 minutes to obtain the casting material;

[0072] Cover the PET film on the surface of the casting material and perform hot pressing operation. The heating temperature is 80°C and the pressure is 2MPa. Cool down under the condition of circulating water and keep the pressure until it reaches room temperature. The hot pressing tim...

Embodiment 2

[0082] Weigh PEO according to the mass ratio of 1:1:1 (M w =100000g / mol), PEGDMA (M w =750g / mol), poly(oxyethylene siloxane)-[(CH 2 -CH 2 -O-CH 2 -CH 2 -O) 2 SiO] 2 -(M w =440g / mol), and with -EO-:Li + Weigh LiTFSI with a molar ratio of 20:1, stir the above materials for 12 hours to mix them evenly, then add the photoinitiator MBP weighed at 3% of the total mass of the solid polymer electrolyte at room temperature, stir and mix the above materials and let stand for 6 hours , to obtain a homogeneous precursor blend.

[0083] Precursor blend liquid according to 10mg / cm 2 The casting amount is cast on the PTFE substrate and heated at 70°C for 25 minutes to obtain the casting material;

[0084] Cover the surface of the casting material with a PET film and perform a hot pressing operation. The heating temperature is 80°C and the pressure is 3 MPa. Cool down under the condition of circulating water while maintaining the pressure until it reaches room temperature. The hot p...

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Abstract

The invention belongs to the technical field of lithium ion batteries, and in particular relates to a room-temperature solid polymer electrolyte, a preparation method thereof, an electrode / electrolyte compound, a preparation method and application thereof. The invention provides a room temperature solid polymer electrolyte, which comprises the following preparation raw materials: lithium salt, polyethylene oxide, crosslinking agent, additive and photoinitiator. In the room temperature solid polymer electrolyte of the present invention, there is an EO chain segment with an active site in the PEO, and a free radical crosslinking reaction occurs under the joint action of other reagents, wherein the PEO chain segment will undergo recombination, and the PEO is indeterminate. The morphology will be enhanced, increasing the room temperature ionic conductivity without sacrificing the mechanical properties of the solid electrolyte membrane. Experimental data shows that the battery prepared by the room temperature solid polymer electrolyte provided by the invention has an ion conductivity of 2.7×10 ‑4 S / cm.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a room temperature solid polymer electrolyte, a preparation method thereof, an electrode / electrolyte compound, a preparation method and application thereof. Background technique [0002] Energy and the environment are the basic conditions for the survival and development of human society, and an important material basis for national construction and economic development. At the same time, energy utilization and environmental protection are also two major problems facing the world today. With the continuous consumption of traditional non-renewable energy and the deterioration of the global environment, it is urgent to develop and utilize new green energy. [0003] As a chemical energy storage system with high energy density, excellent cycle performance and environmental friendliness, lithium-ion batteries have been widely used in mobile communications, di...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0565H01M10/0525
CPCH01M10/0525H01M10/0565H01M2300/0082Y02E60/10
Inventor 康书文李世博孙立群谢海明
Owner 吉林省东驰新能源科技有限公司
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