Photo-cured solid state composite electrolyte and preparation method thereof

A technology of composite electrolyte and solid electrolyte, which is applied in the field of light-cured solid composite electrolyte and its preparation, can solve the problems of reducing impedance and low Coulombic efficiency, and achieve the effects of reducing interface impedance, easy availability of raw materials, and high ionic conductivity

Active Publication Date: 2019-05-21
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the problems of dendrite formation and low coulombic efficiency in the charge-discharge cycle process of existing metal lithium batteries and metal sodium batteries, one of the purposes of the present invention is to provide a photocurable solid-state composite electrolyte, which is introduced into an ionic liquid Increase the interfacial compatibility between the interior of the solid electrolyte and the metal negative electrode, further reduce the impedance, have high ionic conductivity, and can inhibit the generation of dendrites

Method used

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  • Photo-cured solid state composite electrolyte and preparation method thereof
  • Photo-cured solid state composite electrolyte and preparation method thereof
  • Photo-cured solid state composite electrolyte and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0050] (1) In a glove box filled with argon (H 2 O2 13 ]-[TFSI], continue to stir in the dark for 8 hours, and finally add 10 g of Li with a particle size of 5 μm to 8 μm 6.4 La 3 Zr 1.4 Ta 0.6 o 12 ,like figure 1 As indicated, continue to stir in the dark for 3 h at a speed of 500 r / min, and finally obtain a homogeneous mixture.

[0051] (2) In a glove box filled with argon (H 2 O2 figure 2 As shown, the electrolyte is away from the side of the flat plate, the surface is smooth, the content of inorganic solid electrolyte is small, and the polymer content is large. As the side close to the metal negative electrode, the compatibility between the electrolyte and the alkali metal negative electrode can be effectively improved, and the interface impedance can be reduced; the other side The high content of inorganic solid electrolyte is close to the positive electrode side, which can solve the disadvantage that PEO is easily oxidized when it is directly in contact with the p...

Embodiment 2

[0055] (1) In a glove box filled with argon (H 2 O2 13 ]-[TFSI], continue to stir in the dark for 8 hours, and finally add 10 g of Na with a particle size of 5 μm to 8 μm 3 Zr 2 Si 2 PO 12 Continue to stir in the dark for 3 h at a speed of 500 r / min, and finally obtain a homogeneous mixture.

[0056] (2) In a glove box filled with argon (H 2 O2 <0.1ppm), the mixture is coated on a polytetrafluoroethylene plate with a scraper, the thickness of the mixture coating is 150 μm, and the wavelength is 365nm, and the power is 400W ultraviolet lamp irradiation for 5min to cure, and after drying, a kind of light according to the present invention is obtained. Solidified solid composite electrolyte, the electrolyte is away from the side of the plate, the surface is smooth, the content of the inorganic solid electrolyte is small, and the polymer content is large as the side close to the metal negative electrode, which can effectively improve the compatibility between the electrolyte a...

Embodiment 3

[0060] (1) In a glove box filled with argon (H 2 O2 13 ]-[TFSI], continue to stir in the dark for 8 hours, and finally add 10g of Li 6.4 La 3 Zr 1.4 Ta 0.6 o 12 Continue to stir in the dark for 3 h at a speed of 500 r / min, and finally obtain a homogeneous mixture.

[0061] (2) In a glove box filled with argon (H 2 O2 <0.1ppm), the mixture is coated on a polytetrafluoroethylene plate with a scraper, the thickness of the mixture coating is 150 μm, and the UV lamp with a wavelength of 365nm and a power of 400W is irradiated for 5min to cure, and after drying, one of the present invention is obtained. Light-cured solid composite electrolyte, the electrolyte is away from the side of the plate, the surface is smooth, the content of inorganic solid electrolyte is small, and the polymer content is large as the side close to the metal negative electrode, which can effectively improve the compatibility between the electrolyte and the alkali metal negative electrode and reduce the i...

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Abstract

The invention relates to a photo-cured solid state composite electrolyte and a preparation method thereof, and belongs to the technical field of alkali metal batteries. The electrolyte is prepared byuniformly mixing a polymer prepolymer, a photoinitiator, an inorganic solid electrolyte, a salt and an ionic liquid in a light shielding condition, and then carrying out ultraviolet curing under an inert atmosphere. The electrolyte has gradient distribution characteristics due to the gravity sedimentation effect of the inorganic solid state electrolyte in the preparation process, so that the defect that the PEO is directly contacted with the positive electrode and is easy to oxidize can be solved; meanwhile, the metal ion distribution of the surface of the battery electrolyte and the surface of the metal negative electrode can be adjusted, high compatibility of the alkali metal negative electrode and the positive electrode is achieved, and relatively low over-potential and long-term cycling stability in the constant-current polarization can be shown; the impedance of the electrolyte and the electrode interface is relatively small, and the impedance is almost not increased along with the increase of the storage time of the battery; and the method has the advantages that the preparation process is simple, the conventional equipment is used, the raw materials are easy to obtain, the method is safe and pollution-free, and the method is suitable for large-scale batch production.

Description

technical field [0001] The invention relates to a light-cured solid composite electrolyte and a preparation method thereof. The electrolyte has the ability to inhibit the growth of metal lithium and metal sodium dendrites, and to improve the interface compatibility between the interior of the solid electrolyte and the metal negative electrode, and belongs to The technical field of alkali metal batteries. Background technique [0002] Lithium metal has a high theoretical capacity and is considered as a promising anode material. Metal sodium has a higher theoretical capacity (1165mAh / g), and its electrode potential is 300mV higher than that of lithium, so it is also an ideal negative electrode material. However, problems such as dendrite formation and low Coulombic efficiency during the battery charge-discharge cycle seriously hinder the commercialization of metal lithium batteries and metal sodium batteries. Inorganic solid electrolytes have the effect of inhibiting dendrit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/056H01M10/052H01M10/054H01M10/058
CPCY02E60/10Y02P70/50
Inventor 陈人杰邓成龙陈楠谢嫚周智明
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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