Nanostructured quasi-solid electrolyte applied to lithium ion batteries or lithium sulfur batteries and preparation method and application thereof

A lithium-ion battery, lithium-sulfur battery technology, applied in the direction of solid electrolyte, organic electrolyte, non-aqueous electrolyte, etc., can solve the problems of poor cycle performance, low safety capacity, etc., to improve conductivity, ensure no loss, and improve transmission efficiency Effect

Active Publication Date: 2015-11-18
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the problems of poor cycle performance and low safety capacity in lithium-ion batteries and lithium-sulfur batteries in the prior art, the purpose of the present invention is to provide a solid-liquid intermediate state nanostructure electrolyte with good conductivity and stability, which can be used at room temperature Conductivity>10 -3 S / cm, which can be used to prepare solid-state lithium-ion batteries or lithium-sulfur batteries with good cycle stability and high safe capacity

Method used

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  • Nanostructured quasi-solid electrolyte applied to lithium ion batteries or lithium sulfur batteries and preparation method and application thereof
  • Nanostructured quasi-solid electrolyte applied to lithium ion batteries or lithium sulfur batteries and preparation method and application thereof
  • Nanostructured quasi-solid electrolyte applied to lithium ion batteries or lithium sulfur batteries and preparation method and application thereof

Examples

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Embodiment 1

[0036] The preparation component is metal organic framework MIL-53(Al)+EC-DMC-EMC-LiPF 6 Quasi-solid electrolyte, mass ratio 1:3.

[0037] According to technical requirements, MIL-53(Al) was prepared first. Weigh 1.7g of aluminum nitrate hexahydrate and 0.5g of terephthalic acid, add to 25mL of DMF (N,N-dimethylformamide), then add 5mL of deionized water, and heat for 24 hours under the protection of argon to obtain a white powder After cooling down to room temperature, it was soaked in DMF for 3 times, 50 mL each time, for 12 hours, and then the solvent was evaporated under vacuum at 80°C to obtain MIL-53(Al) white powder. Weigh MIL-53(Al) and EC-DMC-EMC-LiPF 6The electrolyte solution is mixed at a mass ratio of 1:3, placed in a clean glass bottle and stirred for 24 hours, and it becomes a viscous white paste after mixing evenly. Spread the intermediate state electrolyte evenly on the positive electrode sheet, and place it for 8 hours to evaporate the excess solvent on the...

Embodiment 2

[0039] The prepared components are metal-organic framework MIL-53(Al)+PTFE+EC-DMC-EMC-LiBOB quasi-solid thin film electrolyte with a mass ratio of 1:1.

[0040] According to technical requirements, MIL-53(Al) was prepared first. Weigh 1.7g of aluminum nitrate hexahydrate and 0.5g of terephthalic acid, add to 25mL of DMF (N,N-dimethylformamide), then add 5mL of deionized water, and heat for 24 hours under the protection of argon to obtain a white powder After cooling down to room temperature, it was soaked in DMF for 3 times, 50 mL each time, for 12 hours, and then the solvent was evaporated under vacuum at 80°C to obtain MIL-53(Al) white powder. Weigh the isopropanol solution of MIL-53(Al) and PTFE and mix them evenly, then use the pair of rollers to press into sheets to make a frame film. Soak the prepared film in EC-DMC-EMC-LiPF 6 After 12 hours in the electrolyte, the excess solvent on the surface was volatilized to prepare an electrolyte film, and its conductivity was te...

Embodiment 3

[0042] A quasi-solid electrolyte suitable for high-temperature conditions is prepared whose components are metal-organic framework MOF-5+EC-DMC-EMC-PS-LFTSI+3%PAA.

[0043] According to the technical requirements, first synthesize MOF-5, weigh 1.50mmol zinc nitrate hexahydrate and 0.50mmol terephthalic acid, add them to 49mL DMF, then add 1mL deionized water, and heat for 7 hours under the protection of argon to obtain white powder crystals After cooling down to room temperature, it was impregnated with DMF for 3 times, 50 mL each time for 12 hours, then exchanged and activated with dichloromethane solvent for 3 times, 50 mL each time for 12 hours, and then evaporated the solvent under vacuum at 40°C to obtain MOF-5 White powder. Mix MOF-5, EC-DMC-EMC-PS-LFTSI at a mass ratio of 2:3, and stir it in a glass bottle for 24 hours to form a viscous light yellow paste-like quasi-solid electrolyte, then add 3% wt of PAA, continue to stir until the components are evenly mixed. Place...

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Abstract

The invention discloses a nanostructured quasi-solid electrolyte applied to lithium ion batteries or lithium sulfur batteries and a preparation method and application thereof. The nanostructured quasi-solid electrolyte is a macro solid-state electrolyte material which is formed by an inorganic-organic hybrid framework material adsorbing ion conductive agent. The preparation method of the nanostructured quasi-solid electrolyte is as follows: in protective atmosphere, the inorganic-organic hybrid framework material is soaked in the ion conductive agent and sufficiently mixed, and redundant solvent is then volatilized. The prepared nanostructured quasi-solid electrolyte with high lithium ion conductivity can be substituted for both organic electrolyte and diaphragms in conventional lithium ion batteries, and thereby safety problems caused by the leakage of the organic electrolyte can be effectively prevented; a lithium battery assembled from the electrolyte can use a metal lithium plate as a cathode.

Description

technical field [0001] The invention discloses a nanostructure quasi-solid electrolyte for lithium-ion batteries and lithium-sulfur batteries, a preparation method and application thereof, and belongs to the technical field of electrolyte material preparation. Background technique [0002] With more and more attention paid to energy and environmental issues, lithium-ion batteries and lithium-sulfur batteries with high energy density and environmental friendliness have become new options in the field of energy storage. As a bridge connecting the positive and negative electrodes of the battery, the electrolyte is an essential key part. The research on the electrolyte has become the focus since the birth of lithium-ion batteries. [0003] At present, electrolytes in batteries are mainly divided into organic electrolytes and solid electrolytes. There is a danger of leakage of organic electrolyte during use, and it will catch fire and burn in a high-temperature environment, whic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M2/14H01M2/16H01M50/40H01M50/446
CPCH01M10/0565H01M2300/0025H01M2300/0065H01M50/403H01M50/46Y02E60/10
Inventor 刘晋李劼董俊斐刘业翔
Owner CENT SOUTH UNIV
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