Polymer film electrolyte of all-solid-state lithium metal battery, preparation method of polymer film electrolyte, and application of polymer film electrolyte in wide temperature range

A polymer film, lithium metal battery technology, used in electrolytes, secondary batteries, circuits, etc., can solve the problems of difficulty in charging and discharging, low ionic conductivity, etc., and achieve a wide electrochemical stability window, high ionic conductivity, Easy to scale up for production

Inactive Publication Date: 2019-08-23
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

However, at room temperature and low temperature, the ionic conductivity of this kind of composite solid electrolyte is still low, so there is a problem that it is difficult to complete the charging and discharging of the all-solid lithium metal battery assembled with this kind of composite solid electrolyte.

Method used

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  • Polymer film electrolyte of all-solid-state lithium metal battery, preparation method of polymer film electrolyte, and application of polymer film electrolyte in wide temperature range
  • Polymer film electrolyte of all-solid-state lithium metal battery, preparation method of polymer film electrolyte, and application of polymer film electrolyte in wide temperature range
  • Polymer film electrolyte of all-solid-state lithium metal battery, preparation method of polymer film electrolyte, and application of polymer film electrolyte in wide temperature range

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Effect test

Embodiment 1

[0046] This embodiment is the preparation of polymer film electrolyte, the process is as follows:

[0047] Dissolve polyethylene oxide, succinonitrile and LiTFSI with a molecular weight of 600,000 in acetonitrile solvent, and stir for 24 hours to obtain a uniform solution. Wherein, the concentration of polyethylene oxide in the solution is 6wt.%, the weight of succinonitrile accounts for 30% of the total mass of succinonitrile and polyethylene oxide, and the weight of LiTFSI accounts for 15% of the total mass of LiTFSI and polyethylene oxide. %. Subsequently, the homogeneous solution was transferred to a polytetrafluoroethylene substrate, and vacuum-dried at 40° C. for 48 hours, then taken out to obtain a polymer film electrolyte.

[0048] figure 1 Shown is the physical picture of the polymer film prepared in this embodiment. The polymer film has good flexibility (such as figure 1 (b)), and the preparation process is simple.

Embodiment 2

[0050] This embodiment is the preparation of polymer film electrolyte, the process is as follows:

[0051] Dissolve polyethylene oxide, neopentyl glycol, and LiTFSI with a molecular weight of 600,000 in acetonitrile solvent, and stir for 24 hours to obtain a uniform solution. Wherein, the concentration of polyethylene oxide in the solution is 6wt.%, the weight of neopentyl glycol accounts for 25% of the total mass of neopentyl glycol and polyethylene oxide, and the weight of LiTFSI accounts for 25% of the total mass of LiTFSI and polyethylene oxide. 15%. Subsequently, the homogeneous solution was transferred to a polytetrafluoroethylene substrate, and vacuum-dried at 40° C. for 48 hours, then taken out to obtain a polymer film electrolyte.

Embodiment 3

[0053] This embodiment is the preparation of polymer film electrolyte, the process is as follows:

[0054] Polyethylene oxide, succinonitrile and LiClO with a molecular weight of 600,000 4 Dissolved in acetonitrile solvent, stirred for 24h to obtain a homogeneous solution. Wherein, the concentration of polyethylene oxide in the solution is 6wt.%, and the weight of succinonitrile accounts for 25% of the total mass of succinonitrile and polyethylene oxide, LiClO 4 weight of LiClO 4and 10% of the total mass of polyethylene oxide. Subsequently, the homogeneous solution was transferred to a polytetrafluoroethylene substrate, and vacuum-dried at 40° C. for 48 hours, then taken out to obtain a polymer film electrolyte.

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Abstract

The invention discloses a polymer film electrolyte of an all-solid-state lithium metal battery, a preparation method of the polymer film electrolyte, and an application of the polymer film electrolytein a wide temperature range, and belongs to the technical field of all-solid-state electrolytes. The polymer film is composed of polyethylene oxide, a plastic crystal material and lithium salt. The polymer film has the characteristics of high ionic conductivity and wide electrochemical stability window. The all-solid-state lithium metal battery using the polymer film as the electrolyte has high capacity in a wide temperature range (-5 DEG C to 100 DEG C). The method is simple in technological process and compatible with an existing technology, the production and matching processes of the solid-state lithium metal battery can be effectively simplified, the battery performance is improved, and therefore, the method has great application prospects.

Description

[0001] Technical field: [0002] The invention relates to the technical field of all-solid electrolytes, in particular to a polymer thin film electrolyte for an all-solid lithium metal battery, a preparation method thereof, and an application in a wide temperature range. [0003] Background technique: [0004] Polyethylene oxide (PEO) is a common solid-state electrolyte matrix, which has a high solubility of lithium salts, and has the advantages of stable contact with lithium metal, high flexibility, and easy processing. One of the materials with high performance solid-state electrolytes has been extensively studied in recent years. [0005] At present, PEO-based solid electrolytes have problems such as low ionic conductivity and poor cycle performance, which still face challenges in practical applications. Unmodified PEO has high crystallinity and low ionic conductivity, which makes the all-solid-state battery assembled with PEO-based solid-state electrolyte have a narrow ope...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0562H01M10/0565
CPCH01M10/0562H01M10/0565H01M2300/0091Y02E60/10
Inventor 李峰徐胜军孙振华孙呈郭成会明
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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