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Polymer electrolyte, preparation method thereof and application of polymer electrolyte in wide-temperature-range and high-rate solid-state lithium battery

A polymer and electrolyte technology, used in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, organic electrolytes, etc., can solve the problems of inability to realize fast charging and fast discharging of batteries, limited application scenarios, and inability of batteries to work, and achieve wide electrochemical performance. Stable window, high ionic conductivity, cost-effective and environmentally friendly

Pending Publication Date: 2022-06-07
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, commercial lithium batteries often use volatile and flammable organic liquid electrolytes, which can easily lead to safety hazards such as battery fire and explosion. Using polymer electrolytes instead of liquid electrolytes is an effective way to improve battery safety.
At present, a variety of polymer electrolyte systems have been reported in the literature, such as polyethylene oxide, polycarbonate, and polymethacrylate. However, although the above electrolyte systems have shown certain application potential, their application scenarios are usually limited. For example, the battery cannot work at low or high temperature, and the assembled battery usually only works at a low rate, which cannot meet the application requirements of fast charging and fast discharging of the battery

Method used

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  • Polymer electrolyte, preparation method thereof and application of polymer electrolyte in wide-temperature-range and high-rate solid-state lithium battery
  • Polymer electrolyte, preparation method thereof and application of polymer electrolyte in wide-temperature-range and high-rate solid-state lithium battery
  • Polymer electrolyte, preparation method thereof and application of polymer electrolyte in wide-temperature-range and high-rate solid-state lithium battery

Examples

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Embodiment 1

[0031] The present embodiment is the preparation of a polymer electrolyte, the process is as follows:

[0032] The molecular weight of 400,000 PVDF-HFP and LiTFSI were dissolved in a dimethyl sulfoxide solvent, stirred for 24 hours to obtain a homogeneous solution. Among them, PVDF-HFP accounts for a mass fraction of 7.9wt.% in solution, and LiTFSI weight accounts for 40wt.% of the total mass of LiTFSI and PVDF-HFP. Subsequently, the homogeneous solution is transferred to a PTFE substrate, frozen at -18 °C for 24 hours, and frozen-dried in a freeze dryer for 48 hours after removal to obtain the polymer electrolyte.

[0033] Figure 1 Schematic diagram of polymer electrolyte preparation and solvent recovery process is shown.

Embodiment 2

[0035] The present embodiment is the preparation of a polymer electrolyte, the process is as follows:

[0036] The molecular weight of 500,000 PVDF and LiTFSI were dissolved in N-methylpyrrolidone solvent, stirred for 24 hours to obtain a homogeneous solution. Among them, PVDF accounts for a mass fraction of 7.9wt.% in solution, and LiTFSI weight accounts for 40wt.% of the total mass of LiTFSI and PVDF. Subsequently, the homogeneous solution is transferred to a PTFE substrate, frozen at -30 ° C for 24 hours, and frozen-dried in a freeze dryer for 48 hours after removal to obtain the polymer electrolyte.

Embodiment 3

[0038] The present embodiment is the preparation of a polymer electrolyte, the process is as follows:

[0039]The PAN and LiFSI with a molecular weight of 150,000 were dissolved in a dimethyl sulfoxide solvent and stirred for 24 hours to obtain a homogeneous solution. Among them, PAN accounts for a mass fraction of 5wt.% in the solution, and LiFSI weight accounts for 30wt.% of the total mass of LiFSI and PAN. Subsequently, the homogeneous solution is transferred to a PTFE substrate, frozen at -18 °C for 24 hours, and frozen-dried in a freeze dryer for 48 hours after removal to obtain the polymer electrolyte.

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Abstract

The invention discloses a polymer electrolyte, a preparation method thereof and application of the polymer electrolyte in a wide-temperature-range and high-rate solid-state lithium battery, and belongs to the technical field of solid-state batteries. The polymer electrolyte is composed of a polymer skeleton, a lithium salt and a small amount of confined solvent, and has the characteristics of high ionic conductivity, high thermal stability and stable electrolyte / electrode interface. The solid-state lithium metal battery assembled by the polymer electrolyte keeps high capacity in a wide temperature range (-10 to 100 DEG C) and high magnification (1 to 50C). The preparation method disclosed by the invention can be compatible with the existing process, can effectively simplify the production matching process of the solid-state lithium metal battery, remarkably improves the battery performance, and further realizes the recovery and reutilization of the solvent in the electrolyte preparation process, so that the preparation method has a relatively good application prospect.

Description

Technical fields: [0001] The present invention relates to the field of solid-state battery technology, specifically to a polymer electrolyte and a preparation method thereof and an application in a wide temperature range, high-rate solid-state lithium metal battery. Background: [0002] At present, commercial lithium batteries often use volatile, flammable organic liquid electrolyte, which can easily lead to battery fire, explosion and other safety hazards, and the use of polymer electrolyte instead of liquid electrolyte is an effective way to improve battery safety. At present, the literature reports a variety of polymer electrolyte systems, such as polyethylene oxide, polycarbonate and polymethacrylate, etc., however, although the above electrolyte system shows certain application potential, but the application scenario is usually limited, such as low temperature or higher temperature battery can not work, and the assembled battery usually only works at low magnification, can n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M10/0566H01M10/0525
CPCH01M10/058H01M10/0566H01M10/0525H01M2300/0025Y02P70/50
Inventor 李峰徐胜军孙振华徐若谷
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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