Composite solid electrolyte material and preparation method and application thereof

A solid electrolyte and positive electrode material technology, applied in the field of composite solid electrolyte materials and their preparation, can solve the problems of low degree of dissociation, difficult to meet the needs of use, poor ion conductivity, etc., to achieve simple operation, excellent electrochemical performance, phase good capacitive effect

Active Publication Date: 2019-08-02
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the temperature is below 60°C, the polymer matrix material has high crystallinity and a low degree of dissociation to alkali metal or alkaline earth metal salts, resulting in poor ion conductivity of the polymer electrolyte at this temperature, which is difficult to meet the use requirements

Method used

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  • Composite solid electrolyte material and preparation method and application thereof
  • Composite solid electrolyte material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Stir 0.6g of PEO with a molecular weight of 4 million and 0.26g of LiTFSI in 15g of acetonitrile until uniform by magnetic force, pour it into a polytetrafluoroethylene mold, and then dry it in vacuum at 100°C for 24 hours. The phase transition temperature of the obtained polymer electrolyte is 53.86°C .

[0050] Add 0.07g MIL-88A (Cr, Fe), MIL-88B (V, Cr, Fe), MIL-88D (Cr, Fe) to the above electrolyte system, and the phase transition temperature of the electrolyte prepared by the same method is respectively The ionic conductivity at 50°C is 8.7×10 -5 S / cm, 8.9×10 -5 S / cm, 9.7×10 -5 S / cm, 1.6×10 -4 S / cm, 8.9×10 -5 S / cm and 9.6×10 -5 S / cm.

[0051] One-third of the ferric salt in the raw material of MIL-88B (Fe) is replaced with divalent nickel salt to prepare MIL-88B (FeNi 2 ), take 0.07g and add it to the above polymer electrolyte system, the phase transition temperature of the composite electrolyte prepared by the same method is 45.75°C, and the ionic conductiv...

Embodiment 2

[0056] Take 11g of N,N-dimethylformamide as solvent, 3g of 1,000,000 molecular weight PEO and 9g of Mg(PF 6 ) 2 Disperse it, stir it until it is uniform, cast it into a polytetrafluoroethylene mold, and then transfer it to 120°C for vacuum drying for 24 hours. The phase transition temperature of the obtained electrolyte is 63.7°C.

[0057] After adding 0.06g of MIL-96(Al,Cr) and Eu-BTC to the same system, the phase transition temperatures of the electrolytes prepared by the same method were 49.8°C, 47.8°C and 45.7°C, respectively, and the ion migration number at 60°C are 0.28, 0.40 and 0.38.

Embodiment 3

[0061] Grind 0.6g of PEO and 0.2g of KTFSI with a molecular weight of 5 million in an agate mortar and mix evenly, then transfer to a circular mold with a diameter of 2cm and extrude at 80°C with a pressure of 10MPa for 12h to obtain a polymer electrolyte membrane. It is 59.4°C.

[0062] In the above polymer electrolyte system, add 1g MIL-68 (Al, Fe), the phase transition temperature of the electrolyte prepared by the same method is 48.3 ℃ and 47.4 ℃ respectively, and the ionic conductivity at 45 ℃ is 7.9× 10 -5 S / cm and 7.5×10 -5 S / cm.

[0063] Replace one-half of the ferric salt in the raw material of MIL-68 (Fe) with ferrous salt to obtain MIL-68 (Al / Fe), MIL-68 (Fe III / Fe II ), added to the same system with the same mass, and the phase transition temperatures of the electrolytes prepared by the same method were 46.1°C and 46.6°C, respectively. When applied to the potassium-sulfur battery system at 50°C, the initial discharge specific capacity at 0.2C rate reached 1228...

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Abstract

The invention discloses a composite solid electrolyte material and a preparation method and application thereof. The composite solid electrolyte material is composed of a conducting ion polymer, a metal-organic framework material and an alkali metal or alkaline earth metal salt. The metal-organic framework material includes MOF-235, MIL-68, MIL-88. MIL-96 and other series. The metal-organic framework material has a special topological structure. The addition of the solid electrolyte material can effectively reduce the crystallinity of the polymer electrolyte, promote the dissociation of the alkali metal or alkaline earth metal salt, the obtained composite solid electrolyte has good ionic conductivity and electrochemical stability in a wide temperature range (25-120 DEG C) and also has goodflexibility and film thinning, and the preparation method is simple and scale production is feasible. The composite solid electrolyte can be matched with different types of positive electrode materials and alkali metal or alkaline earth metal negative electrode, and the assembled all-solid-state battery can present good electrochemical performance at the above-mentioned temperature.

Description

technical field [0001] The invention relates to a composite solid electrolyte material and its preparation method and application, in particular to a composite solid electrolyte material that can be used in a wide temperature range (25-120°C) and its preparation method, and also relates to its application in solid-state batteries . Background technique [0002] At present, liquid lithium-ion batteries are limited by problems such as low energy density and poor safety, and cannot be widely used in the fields of electric vehicles and large-scale energy storage. The use of non-volatile and non-flammable solid electrolytes to replace liquid electrolytes can effectively improve the safety and energy density of batteries. Therefore, solid-state batteries are regarded as a next-generation rechargeable battery system that can achieve high safety and high energy density. Among solid electrolyte materials, polymer solid electrolytes bring great convenience to the preparation of soli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0562H01M10/0565H01M10/0525
CPCH01M10/0525H01M10/0562H01M10/0565H01M2300/0065H01M2300/0088Y02E60/10
Inventor 刘晋李梅
Owner CENT SOUTH UNIV
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