A montmorillonite-based composite solid electrolyte and a solid-state lithium battery

A solid electrolyte, montmorillonite-based technology, applied in solid electrolytes, non-aqueous electrolytes, secondary batteries, etc., to achieve the effects of wide ion migration number, excellent cycle and rate performance, and high room temperature ion conductivity

Active Publication Date: 2019-01-18
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the polymer / inorganic composite solid electrolyte obtained by using hectorite single-ion conductor as the electrolyte matrix has not been reported yet.
In addition, the application of high-voltage resistant organic additives in solid electrolytes has rarely been reported.

Method used

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  • A montmorillonite-based composite solid electrolyte and a solid-state lithium battery
  • A montmorillonite-based composite solid electrolyte and a solid-state lithium battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028]First, fully dissolve hectorite, polyacrylonitrile and lithium salt LiTFSI with a mass ratio of 50:12:25 in acetonitrile in an argon glove box, stir for 18 hours to obtain a uniform viscous slurry, and then cast the slurry Put it into a polytetrafluoroethylene mold, dry it at room temperature for 20 hours, and dry it under vacuum at 45°C for 60 hours to remove the residual solvent to obtain a polymer / hectorite solid mixture. Afterwards, FEC and PTFE binders with mass fractions of 10% and 3% were respectively added to the above mixture, and after being fully mixed, they were pressed at 13MPa for 5min at a temperature of 30°C to obtain a montmorillonite-based composite solid electrolyte with a thickness of 70μm. . The surface morphology of the composite solid electrolyte was observed by scanning electron microscopy (SEM). The surface of the electrolyte membrane was smooth and even, and the inorganic particles were evenly distributed. The room temperature ionic conductivit...

Embodiment 2

[0030] First, hectorite, polypropylene oxide, and lithium salt LiClO with a mass ratio of 45:10:30 were mixed in an argon glove box. 4 Dissolved in acetonitrile, stirred for 36 hours to obtain a uniform viscous slurry, then cast the slurry in a polytetrafluoroethylene mold, dried at room temperature for 40 hours, and dried in vacuum at 50°C for 65 hours to remove residual solvent to obtain a polymer / hectorite solid mixture. Afterwards, TB and PTFE binders with mass fractions of 8% and 2% were respectively added to the above mixture, and after thorough mixing, they were pressed at 12MPa for 25min at 40°C to obtain a composite solid electrolyte membrane with a thickness of 60μm. The surface morphology of the composite solid electrolyte was observed by scanning electron microscopy (SEM). The surface of the electrolyte membrane was smooth and even, and the inorganic particles were evenly distributed. The ionic conductivity of the composite electrolyte at room temperature is 2.8×1...

Embodiment 3

[0032] First, hectorite, polyethylene oxide and lithium salt LiBF with a mass ratio of 50:8:35 were mixed in an argon glove box. 4 Fully dissolved in acetonitrile, stirred for 30 hours to obtain a uniform viscous slurry, then cast the slurry in a polytetrafluoroethylene mold, dried at room temperature for 35 hours, and dried under vacuum at 60°C for 50 hours to remove residual solvents to obtain polymer / hectorite solid mixture. Afterwards, ETFEC and PTFE binders with a mass fraction of 2% and 5% respectively were added to the above mixture, and after thorough mixing, the composite solid electrolyte membrane with a thickness of 65 μm was obtained by pressing at 10 MPa for 20 minutes at a temperature of 45°C. The surface morphology of the electrolyte membrane was observed by scanning electron microscopy (SEM). The surface of the electrolyte membrane was smooth and even, and the particles were uniformly dispersed. The room temperature ionic conductivity of the composite electrol...

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Abstract

The invention discloses a montmorillonite-based composite solid electrolyte and a solid-state lithium battery. The montmorillonite-based composite solid electrolyte comprises a lithium montmorilloniteinorganic single-ion conductor, a polymer with lithium ion transport ability, a lithium salt, a high-voltage-resistant organic additive and polytetrafluoroethylene with high adhesion property, The montmorillonite-based composite solid electrolyte takes lithium montmorillonite inorganic single ionic conductor as an electrolyte matrix, and the lithium montmorillonite inorganic single ionic conductor has high ion migration number, wide voltage window and high thermal stability. The montmorillonite-based composite solid electrolyte has high room temperature ionic conductivity () 10-4S cm-1), widevoltage window (4.2-5.5 V) and high ion migration numb () 0.5. That solid-state lithium battery assembled by the montmorillonite composite solid electrolyte of the invention has excellent cycle stability.

Description

technical field [0001] The invention belongs to the technical field of new energy, and in particular relates to a montmorillonite-based composite solid electrolyte and a preparation and application method thereof. Background technique [0002] At present, energy shortage and environmental pollution are becoming more and more serious, and the development and utilization of clean and renewable energy has become an extremely urgent problem for mankind. The development of renewable energy such as solar energy, wind energy, water energy, nuclear energy and geothermal energy has become an inevitable trend of energy development. The development of new renewable energy will inevitably promote the continuous development of corresponding high-efficiency energy storage devices. Lithium-ion batteries have the advantages of high energy density, high working voltage, large specific capacity, long cycle life, and environmental friendliness. They have been widely used in electric vehicles,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/056H01M10/0525
CPCH01M10/0525H01M10/056H01M2300/0065Y02E60/10
Inventor 范丽珍陈龙
Owner UNIV OF SCI & TECH BEIJING
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