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Composite solid electrolyte with wide electrochemical window and and preparation method of composite solid electrolyte

A solid electrolyte, electrochemical technology, applied in the field of electrochemical energy storage, can solve the problems of poor oxidation resistance of the positive electrode, narrow electrochemical window, unsuitable for ternary batteries, etc., and achieve the effects of high yield and simple preparation process.

Active Publication Date: 2020-07-03
THE HONG KONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although there are many advantages, the current solid electrolytes usually have a narrow electrochemical window, which cannot be applied to lithium metal anodes and high-voltage ternary cathodes at the same time.
For example, oxide solid electrolyte perovskite-type LLTO and Nasicon-type LAGP have excellent positive electrode oxidation resistance, but they will be reduced by lithium metal and cannot be suitable for lithium metal negative electrode
Another example is that polyethylene oxide (PEO) solid electrolyte has good compatibility with lithium metal, but the positive electrode has poor oxidation resistance and cannot be used in ternary batteries.

Method used

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  • Composite solid electrolyte with wide electrochemical window and and preparation method of composite solid electrolyte
  • Composite solid electrolyte with wide electrochemical window and and preparation method of composite solid electrolyte
  • Composite solid electrolyte with wide electrochemical window and and preparation method of composite solid electrolyte

Examples

Experimental program
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Effect test

Embodiment 1

[0035] The specific preparation process of the wide electrochemical window composite solid electrolyte in this example is as follows:

[0036] Weigh 0.1 g of nano-boron nitride (BN) and place it in 10 ml of N,N-dimethylformamide (DMF), sonicate for 48 hours, and then centrifuge to obtain exfoliated BN nanosheets. Weigh 0.5g polyacrylonitrile (PAN), 0.25g lithium perchlorate (LiClO 4 ) and 0.05g of BN nanosheets, add 10ml of N,N-dimethylformamide (DMF), heat and stir at 80°C to make PAN, LiClO4 Completely dissolved to obtain the precursor slurry of the composite solid electrolyte. Then, the obtained slurry was coated on a clean glass plate by tape casting, and dried in a vacuum oven at 80° C. for 12 hours to obtain a PAN-BN composite solid electrolyte. Then weigh 0.5 g of BN nanosheets and 0.06 g of polyvinylidene fluoride (PVDF), add 10 ml of DMF, heat and stir to dissolve PVDF, and obtain a protective layer slurry. Finally, the BN-PVDF slurry was evenly coated on the surfac...

Embodiment 2

[0040] The specific preparation process of the wide electrochemical window composite solid electrolyte in this example is as follows:

[0041] Weigh 0.5g polyacrylonitrile (PAN), 1.0g lithium perchlorate (LiClO 4 ) and 0.1gZrO 2 Mix particles (particle size: ~100nm), add 15ml dimethyl sulfoxide (DMSO), heat and stir at 60°C to make PAN, LiClO 4 Completely dissolved to obtain the precursor slurry of the composite solid electrolyte. Then the resulting slurry was coated on a clean glass plate by tape casting, and dried in a vacuum oven at 60°C for 24 hours to obtain PAN-ZrO 2 Composite solid electrolyte. Then weigh 0.5g of BN nanosheets (diameter: ~100nm) and 0.01g of polyvinylidene fluoride (PVDF), add 15ml of DMF, heat and stir to dissolve PVDF, and obtain the protective layer slurry. Finally, the tape casting method was used to evenly coat the BN-PVDF slurry on the PAN-ZrO 2 The surface of the composite solid electrolyte was kept in a vacuum oven at 100° C. for 6 hours to...

Embodiment 3

[0043] The specific preparation process of the wide electrochemical window composite solid electrolyte in this example is as follows:

[0044] Weigh 0.1 g of nanometer boron nitride (BN) and place it in 10 ml of N,N-dimethylformamide (DMF), sonicate for 48 hours, and then centrifuge to obtain BN nanosheets. Weigh 0.5g of polyacrylonitrile (PAN), 0.6g of lithium bistrifluoromethanesulfonimide (LiTFSI) and 0.1g of the resulting BN nanosheets, add 30ml of dimethyl sulfoxide (DMSO), and heat and stir at 80°C Make PAN, LiClO 4 completely dissolved. Then, the obtained slurry was coated on a clean glass plate by tape casting, and dried in a vacuum oven at 40° C. for 30 h to obtain a PAN-BN composite solid electrolyte. Then weigh 0.5g of LiF particles (particle size: ~1um) and 0.3g of polyvinylidene fluoride (PVDF), add 10ml of DMSO, heat and stir to dissolve PVDF, and obtain the protective layer slurry. Finally, the LiF-PVDF slurry was evenly coated on the surface of the PAN-BN co...

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Abstract

The invention relates to the field of electrochemical energy storage, in particular to a composite solid electrolyte with a wide electrochemical window and a preparation method of the composite solidelectrolyte. The composite solid electrolyte comprises polyacrylonitrile, a lithium salt, a ceramic filler and a protective layer material. The preparation method comprises the following steps: firstly, preparing precursor slurry of the composite electrolyte through ball milling or heating and stirring; then coating a clean glass plate with the slurry by adopting a tape casting method, and dryingto obtain a PAN-based composite solid electrolyte; and finally, preparing protective layer slurry, uniformly coating one surface of the obtained PAN-based composite solid electrolyte with the protective layer slurry through a spin-coating method or a tape casting method, and drying to obtain the composite solid electrolyte with the wide electrochemical window. The composite solid electrolyte disclosed by the invention has the advantages of wide electrochemical window (0-4.5 Vvs.Li / Li < + >), small thickness (5-300 microns), good flexibility, simple preparation method and the like, and is suitable for the fields of lithium ion batteries, flow batteries and the like.

Description

technical field [0001] The invention relates to the field of electrochemical energy storage, in particular to a wide electrochemical window composite solid electrolyte and a preparation method thereof. Background technique [0002] A new generation of batteries with high energy density and high safety is the key to the development of portable electronic products and electric vehicles, and has recently become the research focus of academia and industry. Lithium metal has extremely high energy density and the most negative potential, known as the crown of anode materials. In addition, traditional lithium-ion batteries use lithium iron phosphate as the positive electrode active material, but lithium iron phosphate has low potential and energy density, which cannot meet the current market demand for high energy density batteries. Using lithium metal negative electrode to replace traditional carbon material negative electrode and high-voltage ternary positive electrode to replac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/0525H01M10/058
CPCH01M10/0525H01M10/0565H01M10/058Y02E60/10Y02P70/50
Inventor 赵天寿刘克巫茂春
Owner THE HONG KONG UNIV OF SCI & TECH
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