High voltage-resistant multi-stage structure composite solid-state electrolyte for lithium battery

A solid electrolyte and electrolyte technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problems that are difficult to meet the use of lithium-ion batteries, the application of interfacial compatibility suppression, and low ion conductivity

Active Publication Date: 2018-02-23
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] So far, most solid-state electrolytes use a single component as the electrolyte. Although it can improve the safety performance and energy density of lithium-ion batteries, there are often some disadvantages in a single electrolyte.
As one of the most widely studied electrolyte matrices, polyoxyethylene (PEO) matrix has low ionic conductivity, which is difficult to meet the requirements of lithium-ion batteries at room temperature.
201410378107.X and 200680012628.7 disclosed the preparation of PEO-containing electrolytes. Although the ionic conductivity has been improved, th...

Method used

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  • High voltage-resistant multi-stage structure composite solid-state electrolyte for lithium battery
  • High voltage-resistant multi-stage structure composite solid-state electrolyte for lithium battery
  • High voltage-resistant multi-stage structure composite solid-state electrolyte for lithium battery

Examples

Experimental program
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Effect test

Embodiment 1

[0045] PVCA-PPC-PEO three-layer composite solid electrolyte

[0046] Dissolve PVCA and LiDFOB with a molecular weight of 150,000 in DMF, the mass ratio of PVCA and LiDFOB is 5:1, and the concentration of PVCA in DMF is 2 g mL -1 ; Dissolve PPC and LiDFOB with a molecular weight of 300,000 in acetonitrile, the mass ratio of PPC and LiDFOB is 5:1, and the concentration of PPC in acetonitrile is 4 g mL -1 ; Dissolve PEO and LiDFOB with a molecular weight of 5 million in acetonitrile, the mass ratio of PEO and LiDFOB is 5:1, and the concentration of PEO in acetonitrile is 2 g mL -1 .

[0047] Scrape the PVCA solution on a glass plate with a 75 μm spatula; 60 o C was dried for 6 hours, and the PPC solution was scraped on the PVCA film with a 400 μm scraper; 60 o C dried for 6 hours, scraped the PEO solution on the PPC film with a 250 μm scraper; put the electrolyte at 60 o C in a vacuum oven for 12 hours to obtain a PVCA-PPC-PEO three-layer composite polymer electrolyte with a ...

Embodiment 2

[0050] PVCA-PEC-PEO three-layer composite solid electrolyte

[0051] Dissolve PVCA and LiTFSI with a molecular weight of 150,000 in DMF, the mass ratio of PVCA and LiTFSI is 5:1, and the concentration of PVCA in DMF is 2 g mL -1 ; Dissolve PEC and LiTFSI with a molecular weight of 300,000 in acetonitrile, the mass ratio of PEC and LiTFSI is 2:1, and the concentration of PEC in acetonitrile is 4 g mL -1 ; Dissolve PEO and LiTFSI with a molecular weight of 1 million in acetonitrile, the mass ratio of PEO and LiTFSI is 5:1, and the concentration of PEO in acetonitrile is 2 g mL -1 .

[0052] Scrape the PVCA solution on a glass plate with a 50 μm spatula; 60 o C was dried for 6 hours, and the PEC solution was scraped on the PVCA film with a 600 μm scraper; 60 o C dried for 6 hours, scraped the PEO solution on the PEC membrane with a 400 μm scraper; put the electrolyte at 60 o C in a vacuum oven for 12 hours to obtain a PVCA-PEC-PEO three-layer composite polymer electrolyte wit...

Embodiment 3

[0055] PMMA-PPC-PPO three-layer composite solid electrolyte

[0056] Dissolve PMMA and LiTFSI with a molecular weight of 300,000 in DMF, the mass ratio of PMMA and LiTFSI is 5:1, and the concentration of base PMMA in DMF is 0.5 g mL -1 ; Dissolve PPC and LiTFSI with a molecular weight of 300,000 in acetonitrile, the mass ratio of PPC and LiTFSI is 5:1, and the concentration of PPC in acetonitrile is 4 g mL -1 ; Dissolve PPO and LiTFSI with a molecular weight of 300,000 in acetonitrile, the mass ratio of PPO and LiTFSI is 8:1, and the concentration of PPO in acetonitrile is 1 g mL -1 .

[0057] Scrape the PMMA solution on a glass plate with a 20 μm spatula; 60 o C was dried for 6 hours, and the PPC solution was scraped on the PMMA film with a 100 μm scraper; 60 o C dried for 6 hours, and the PPO solution was scraped on the PPC film with a 100 μm scraper; the electrolyte was placed at 60 o C in a vacuum oven for 12 hours to obtain a PMMA-PPC-PPO three-layer composite polymer...

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Abstract

The invention discloses a high voltage-resistant multi-stage structure composite solid-state electrolyte and its preparation method and use in a solid-state lithium battery. The lithium battery utilizes a multi-stage structure solid-state electrolyte containing different components. A polymer electrolyte with excellent electrode interface compatibility is used as an electrolyte in the negative electrode side. A high voltage-resistant polymer electrolyte is used as an electrolyte in the positive electrode side. A polymer electrolyte or an inorganic electrolyte with high ionic conductivity is used as a middle layer. The multi-stage structure solid-state electrolyte has advantages such as high mechanical properties, high ionic conductivity, a wide electrochemical window, excellent electrode interfacial compatibility and lithium dendrite growth inhibition of different components. Compared with the traditional liquid lithium ion battery, the battery with the multi-stage composite solid-state electrolyte has higher safety and higher energy density.

Description

technical field [0001] The invention relates to battery technology, in particular to a composite solid electrolyte with a multi-level structure and a preparation method thereof, as well as its application in lithium batteries. Background technique [0002] At present, large-scale commercial lithium-ion batteries generally use organic carbonate-based liquid electrolytes. There are dangers of leakage, burning, explosion and so on. Therefore, safety issues have become a key factor restricting the development of lithium-ion batteries. Replacing the original liquid electrolyte with a solid electrolyte can effectively improve the safety performance of lithium-ion batteries. Lithium-ion batteries using solid-state electrolytes have good safety performance, high energy density, and wide operating temperature, and have become one of the research hotspots. At the same time, the solid electrolyte has a high Young's modulus, which can inhibit the formation of lithium dendrites and re...

Claims

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Application Information

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IPC IPC(8): H01M10/0565H01M10/0525
CPCH01M10/0525H01M10/0565Y02E60/10
Inventor 崔光磊柴敬超马君徐红霞董杉木张建军鞠江伟王鹏
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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