Composite solid electrolyte and preparation method thereof

A solid electrolyte and composite metal technology, which is applied in the preparation of alumina/hydroxide, circuits, secondary batteries, etc., can solve problems that have not been reported in the literature, and achieve high lithium ion migration number and good electrochemical stability , the effect of high ionic conductivity

Inactive Publication Date: 2009-09-02
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] If inorganic materials with both nanometer size and porous structure are added to PEO-LiClO 4 system, the obtained composite solid electrolyte is expected to have better performance, but the relevant research has not been reported in the literature

Method used

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

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Embodiment 1

[0027] According to Zn / Al molar ratio is 3 / 1 and the total concentration is [Zn 2+ ]+[Al 3+ ]=1.2mol / L weighs Zn(NO 3 ) 2 ·6H 2 O and Al(NO 3 ) 3 9H 2 O was dissolved in deionized water to prepare a saline solution; according to [CO 3 2- ]=2.0[Al 3+ ], [OH - ]=1.6([Zn 2+ ]+[Al 3+ ]) Weigh NaOH and NaCO 3 Dubbed an alkali solution equal in volume to the salt solution. Pour the above-mentioned salt solution and alkali solution into a colloid mill at the same time, react at a speed of 3000 rpm for 2 minutes, then transfer the white slurry into a three-necked flask for crystallization at 90°C for 4 hours, and suction filter the crystallized product. After washing with deionized water for several times until the pH of the filtrate = 7, the filter cake was oven-dried at 60° C. for 12 hours to obtain a precursor of zinc-aluminum double hydroxy composite metal oxide. Put the above precursor into a muffle furnace, start from room temperature at a rate of 10 °C / min to 700 ...

Embodiment 2

[0030] According to Zn / Al molar ratio is 4 / 1 and the total concentration is [Zn 2+ ]+[Al 3+ ]=1.0mol / L weighs Zn(NO 3 ) 2 ·6H 2 O and Al(NO 3 ) 3 9H 2 O was dissolved in deionized water to prepare a saline solution; according to [CO 3 2- ]=2.0[Al 3+ ], [OH - ]=1.6([Zn 2+ ]+[Al 3+ ]) Weigh NaOH and NaCO 3 Dubbed an alkali solution equal in volume to the salt solution. Pour the above-mentioned salt solution and alkali solution into a colloid mill at the same time, react at a speed of 2000 rpm for 3 minutes, then transfer the white slurry into a three-necked flask for crystallization at 80°C for 5 hours, suction filter the crystallized product, After washing with deionized water for several times until the pH of the filtrate = 7, the filter cake was dried in an oven at 80° C. for 15 hours to obtain a zinc-aluminum double hydroxy compound metal oxide precursor. Put the above precursor into a muffle furnace, start from room temperature at a rate of 12 °C / min to 650 °C...

Embodiment 3

[0033] According to Zn / Al molar ratio is 2 / 1 and the total concentration is [Zn 2+ ]+[Al 3+ ]=1.5mol / L weighs Zn(NO 3 ) 2 ·6H 2 O and Al(NO 3 ) 3 9H 2 O was dissolved in deionized water to prepare a saline solution; according to [CO 3 2- ]=2.0[Al 3+ ], [OH - ]=1.6([Zn 2+ ]+[Al 3+ ]) Weigh NaOH and NaCO 3 Dubbed an alkali solution equal in volume to the salt solution. Pour the above-mentioned salt solution and alkali solution into a colloid mill at the same time, react at a speed of 4000 rpm for 2 minutes, then transfer the white slurry into a three-necked flask and crystallize at 70°C for 6 hours, and suction filter the crystallized product. After washing with deionized water for several times until the pH of the filtrate = 8, the filter cake was oven-dried at 70° C. for 12 hours to obtain a precursor of zinc-aluminum double hydroxy composite metal oxide. Put the above precursor into a muffle furnace, start from room temperature at a rate of 12 °C / min to 750 °C a...

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Abstract

The invention relates to a composite solid electrolyte and a preparation method thereof, which belongs to the technical field of lithium ion battery electrolyte materials and the preparation technology thereof. The composite solid electrolyte comprises polyethylene glycol oxide, lithium salt and nanometer multiporous spinel combined metal oxide. The preparation method comprises the steps: the nanometer multiporous spinel combined metal oxide is added into an acetonitrile solvent for ultrasonic dispersion; then, the polyethylene glycol oxide and the lithium salt are added into the mixture and are mixed at room temperature to obtain even and transparent viscous solution; the solution is poured into a polyfluortetraethylene mould protected by nitrogen to vaporize the acetonitrile solvent; and finally, the solution is dried in vacuum to obtain a composite solid electrolyte film containing the nanometer multiporous spinel combined metal oxide. The method uses the spinel combined metal oxide with the nanometer size and the multiporous structure as an additive to prepare the composite solid electrolyte which has high lithium ion transference number, high ionic conductivity, low interface resistance and good electrochemical stability. The composite solid electrolyte can be used for all solid state lithium ion batteries.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery electrolyte materials and preparation thereof, in particular to a composite solid electrolyte and a preparation method thereof, a composite solid electrolyte containing nanoporous spinel-type composite metal oxides that can be used for all-solid-state lithium-ion batteries Background technique [0002] Since Wright et al. first discovered in 1973 that polyethylene oxide (PEO) and alkali metal salts have ion conductivity, the polyethylene oxide-lithium salt (PEO-LiX) polymer electrolyte system has been light in weight, pollution-free, and can It has attracted much attention to replace the liquid electrolyte in conventional lithium-ion batteries. However, the unmodified PEO-LiX solid electrolyte has the disadvantages of low ionic conductivity and lithium ion migration number at room temperature, poor electrochemical stability and mechanical properties. Adding inorganic materials to the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/40C08L71/02C08K3/22H01M10/38C08J5/18C01F7/30C01G9/02
CPCY02E60/12Y02E60/10Y02P70/50
Inventor 杨文胜王立仕王健
Owner BEIJING UNIV OF CHEM TECH
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