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Method for improving stability of composite solid electrolyte

A technology of solid electrolyte and enhanced compounding, which is applied in the direction of circuits, electrical components, secondary batteries, etc., can solve problems such as damage to electrolyte stability, aggregation of inorganic solid electrolyte particles, etc. The effect of reunion

Inactive Publication Date: 2019-05-17
GUANGDONG TEAMGIANT NEW ENERGY TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of preparing composite solid electrolyte materials by blending and hot pressing, the aggregation of inorganic solid electrolyte particles often occurs, which greatly damages the stability of the electrolyte.

Method used

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  • Method for improving stability of composite solid electrolyte

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Dry 60g polyethylene oxide (PEO) at 50°C for 18h, LiTi 2 (PO 4 ) 3 and carbon black (Super P) were dried at 120°C for 18h, while the zeolite was heat-treated at 300°C for 24h. The above raw materials were mixed according to the mass ratio of polymer solid electrolyte, inorganic solid electrolyte, carbon black (Super P) and mineral material at 1:2.2:0.02:0.1, and uniformly dispersed in a ball mill for 3 hours. Finally, a composite solid electrolyte membrane with a film thickness of about 1 μm was made from the raw materials by a blending hot pressing method at 120°C.

Embodiment 2

[0028] Dry 60g polyethylene oxide (PEO) at 50°C for 18h, LiTi 2 (PO 4 ) 3 and carbon black (Super P) were dried at 120°C for 18h, while attapulgite was heat-treated at 300°C for 24h. The above raw materials were mixed according to the mass ratio of polymer solid electrolyte, inorganic solid electrolyte, carbon black (Super P) and mineral material at 1:2.2:0.02:0.1, and uniformly dispersed in a ball mill for 3 hours. Finally, a composite solid electrolyte membrane with a film thickness of about 1 μm was made from the raw materials by a blending hot pressing method at 120°C.

Embodiment 3

[0030] Dry 60g polyethylene oxide (PEO) at 50°C for 18h, LiTi 2 (PO 4 ) 3 and carbon black (Super P) were dried at 120°C for 18h, while sepiolite was heat-treated at 300°C for 24h. The above raw materials were mixed according to the mass ratio of polymer solid electrolyte, inorganic solid electrolyte, carbon black (Super P) and mineral material at 1:2.2:0.02:0.1, and uniformly dispersed in a ball mill for 3 hours. Finally, a composite solid electrolyte membrane with a film thickness of about 1 μm was made from the raw materials by a blending hot pressing method at 120°C.

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Abstract

The invention discloses a method for improving the stability of a composite solid electrolyte. The method comprises the following specific steps of drying a polymer solid electrolyte, an inorganic solid electrolyte and carbon black at a moderate temperature, performing heat treatment on an inorganic mineral material for 12-24h at 200-400 DEG C, mixing the raw materials according to a specific massratio, performing uniform dispersion for 2-4h in a ball mill, and preparing a milled sample by a blending hot press method at 100-140 DEG C into a composite solid electrolyte film with the thicknessabout 1 micrometer. According to the method, inorganic mineral serves as a filler, so that the performance of the solid electrolyte is improved; the inorganic mineral serves as a dispersing agent, sothat inorganic solid electrolyte grains are uniformly dispersed in the polymer solid electrolyte; the problem of aggregation of the inorganic solid electrolyte grains is solved; the index performanceof the composite solid electrolyte is improved; and the stability of the composite solid electrolyte in a battery application is improved.

Description

technical field [0001] The invention relates to the field of modification of solid electrolytes, in particular to a method for enhancing the stability of composite solid electrolytes. Background technique [0002] Non-volatile and non-flammable solid-state electrolytes can be used to replace traditional liquid electrolytes and diaphragm materials in lithium-ion batteries, which greatly simplifies the structure of the battery cell and the thermal management system of the battery, enhances the volume, mass and energy density of the battery, and greatly Improving the safety performance of the battery is the development trend of the new generation of batteries. At present, solid-state electrolytes can be roughly divided into three categories: inorganic, polymer, and composite solid-state electrolytes. Generally, inorganic solid electrolytes are brittle, and the grain boundaries in the electrolyte and the interface between the electrolyte and the electrode material have high imp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/0525H01M10/42
CPCY02E60/10
Inventor 蔡比亚王强叶茂
Owner GUANGDONG TEAMGIANT NEW ENERGY TECH CORP