Preparation method of single-ionic conductor SiO2@Li<+1> with core-shell structure in polymer electrolyte

A core-shell structure and electrolyte technology, applied in circuits, electrical components, secondary batteries, etc., can solve the problems of increasing the internal resistance of the battery, affecting the battery performance, and the migration number cannot be significantly improved, and achieving good dispersion. and morphology, excellent electrochemical properties, improved mechanical properties and ionic conductivity

Inactive Publication Date: 2013-03-27
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

With the repeated charging and discharging of the assembled lithium-ion battery, due to the dispersion of inorganic particles, the migration number of lithium ions in it is often not significantly improved due to the addition of inert oxide particles, thereby increasing the internal capacity of the battery. Resistance, so that the performance of the battery is greatly affected

Method used

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  • Preparation method of single-ionic conductor SiO2@Li&lt;+1&gt; with core-shell structure in polymer electrolyte
  • Preparation method of single-ionic conductor SiO2@Li&lt;+1&gt; with core-shell structure in polymer electrolyte
  • Preparation method of single-ionic conductor SiO2@Li&lt;+1&gt; with core-shell structure in polymer electrolyte

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Use vinyltrimethylsilane as the silicon source, in the ethanol solution of water, choose ammonia water as the catalyst, control m (silicon source): m (water): m (catalyst): m (absolute ethanol) = 1.5: 2.5 : 1: 25. At 40°C, after hydrolysis for 2h, 4h, 6h, 8h and 10h, respectively, filter or centrifuge to prepare monodisperse spherical SiO 2 , and then freely polymerized with sodium p-styrenesulfonate at 80 °C for 12 h in the presence of azobisisobutyronitrile to obtain SiO 2 Na + , and finally ion-exchange SiO2Na+ and lithium hydroxide at 90°C for 20 hours, and the product is vacuum-dried at 60°C to obtain SiO 2 Li + . Weigh the prepared 0.4g SiO 2 Li + Uniformly dispersed in N,N-dimethylformamide (DMF) solution of polyvinylidene fluoride and hexafluoropropylene copolymer (PVDF-HFP) under ultrasonic vibration, obtained after vigorous stirring at 40°C for 4h The uniform and transparent gel was left to stand for 30 minutes, then vacuum degassed, and cast on a polyte...

Embodiment 2

[0029] Using the mixed solution of vinyltris(β-methylethoxy)silane and butyl orthosilicate as the silicon source, in the ethanol solution of water, choose the mixed solution of ammonia water and sodium acetate as the catalyst, and control m (silicon source): m (water): m (catalyst): m (absolute ethanol) = 1.5: 2.5: 1: 25. Hydrolyze at 40°C for 8 hours, filter or centrifuge to prepare monodisperse spherical SiO2, and then in azobisisobutyronitrile Free polymerization with sodium p-styrene sulfonate at 80°C for 12h in the presence of SiO 2 Na + , and finally the SiO 2 Na + Ion exchange with lithium hydroxide at 90°C for 20 hours, and the product is vacuum dried at 60°C to obtain SiO 2 Li + . Disperse the prepared 0.4g SiO2Li+ uniformly in the N,N-dimethylformamide (DMF) solution of polyvinylidene fluoride and hexafluoropropylene copolymer (PVDF-HFP) under ultrasonic vibration, and forcefully The homogeneous and transparent gel obtained after stirring for 4 hours was left t...

Embodiment 3

[0033] Use vinyl tris(β-methylethoxy)silane as the silicon source, in the ethanol solution of water, choose the mixed solution of ammonia water and sodium hydroxide as the catalyst, and control m (silicon source): m (water): m (Catalyst): m (absolute ethanol) = 1.5: 2.5: 1: 25. Hydrolyze at 40°C for 8 hours, filter or centrifuge to prepare monodisperse spherical SiO2, and then in the presence of azobisisobutyronitrile Sodium styrene sulfonate was freely polymerized at 80°C for 8h, 10h, 12h and 14h to obtain SiO 2 Na + , and finally the SiO 2 Na + Ion exchange with lithium hydroxide at 90°C for 16h, 18h, 20h and 24h, and the product is vacuum dried at 60°C to obtain SiO 2 Li + . Disperse the prepared 0.4g SiO2Li+ uniformly in the N,N-dimethylformamide (DMF) solution of polyvinylidene fluoride and hexafluoropropylene copolymer (PVDF-HFP) under ultrasonic vibration, and forcefully The homogeneous and transparent gel obtained after stirring for 4 hours was left to stand for ...

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Abstract

The invention discloses a preparation method of single-ionic conductor SiO2@Li<+1> with a core-shell structure in a polymer electrolyte. The preparation method is characterized in that the single-ionic conductor SiO2@Li<+1> with the core-shell structure is prepared by a hydrolysis-free radical polymerization-ion exchange method. The preparation method comprises the steps of: preparing mono-dispersed sphere-shaped functional type SiO2 by a silicon source and aqueous ethanol solution in the presence of a catalyst by controlling hydrolysis temperature; adding organic sodium salt in the presence of a free radical initiator to prepare SiO2@Na<+1> through free radical polymerization; and finally, performing ion exchange on SiO2@Na<+1> and lithium salt to prepare the single-ionic conductor SiO2@Li<+1> with the core-shell structure. According to the invention, the composite polymer electrolyte doped with the prepared single-ionic conductor SiO2@Li<+1> with the core-shell structure has high lithium-ion transference number and good multiplying power and cycle performance.

Description

technical field [0001] The invention belongs to the field of preparation methods of lithium-ion polymer electrolyte materials, and relates to a core-shell structure single-ion conductor SiO 2 Li + method of preparation. Background technique [0002] Lithium-ion batteries using polymer membranes as electrolytes have the advantages of high specific energy, safety, flexible shape, ability to inhibit dendrite growth, buffer electrode volume changes during charge and discharge, and eliminate battery safety issues associated with liquid electrolytes. It is one of the important development directions of lithium-ion secondary batteries at present. At present, the main polymer electrolytes are divided into gel polymer electrolytes, composite polymer electrolytes and single (fast) ion lithium salt doped composite electrolytes with new structures (referred to as single (fast) ion electrolytes). Gel-type electrolytes have up to 10 -3 S cm -1 The ionic conductivity of the order of m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0568
CPCY02E60/12Y02E60/10
Inventor 李新海肖围郭华军王志兴张云河黄思林李艳彭文杰胡启阳
Owner CENT SOUTH UNIV
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