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Micro-capsule film ceramic solid electrolyte for power lithium battery and preparation method

A technology of solid electrolyte and ceramic electrolyte, which is applied in solid electrolyte, non-aqueous electrolyte, secondary battery, etc., can solve the problems of unstable ion channel and electron conduction ion channel, and achieve good mechanical properties, good adhesion, The effect of reducing production costs

Active Publication Date: 2018-06-08
中瑞丸达机电科技(北京)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Aiming at the defect that the ceramic solid electrolyte metal ion in the existing lithium battery is easy to reduce, the electronic conduction and the ion channel are unstable, the present invention proposes a microcapsule film ceramic solid electrolyte for a power lithium battery and a preparation method, which overcomes the temperature shock of the ceramic film Due to the unstable defects of ion channels, the obtained solid electrolyte membrane has good mechanical properties and is suitable for continuous batch preparation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Set the speed of the high-energy ball mill at 800rpm, the time of ball milling at 5 hours, use corundum balls as the ball ink medium, and grind the lithium ceramic electrolyte with NASICON structure to a particle size of 30nm;

[0034] (2) Mix sodium methyl silicate, potassium aluminum silicate, citric acid, polyethylene oxide and water according to the stoichiometric ratio of 1:1:0.3:0.1:15, add triethanolamine to the system, and the amount of dispersant added It is 0.5wt.% of the powder. After mixing evenly, the solution is evaporated under reduced pressure at 80°C to obtain a viscous transparent sol. The transparent sol is vacuum-dried at 100°C for 12 hours to obtain silica hydrogel and polyoxide Vinyl composite gel.

[0035] (3) The weight ratio of the nano-scale ceramic electrolyte to the composite gel is 1:75, and then the nano-scale ceramic electrolyte is added to the composite gel, and nitrogen is used as the carrier gas for spray drying, and the outlet ejec...

Embodiment 2

[0038] (1) Set the speed of the high-energy ball mill at 1200rpm, and the time of ball milling at 2 hours. The ball ink medium is agate balls, and the perovskite lithium ceramic electrolyte is ground to a particle size of 850nm;

[0039] (2) Mix sodium methyl silicate, sodium silicate, citric acid, polyethylene oxide and water according to the stoichiometric ratio of 1:1:0.5:0.1:5, add phosphoric acid ester to the system, and the amount of dispersant added is 2wt.% of the powder, after mixing evenly, the solution was evaporated under reduced pressure at 65°C to obtain a viscous transparent sol, and the transparent sol was vacuum-dried at 80°C for 36 hours to obtain a mixture of silica hydrogel and polyethylene oxide. Composite gel.

[0040] (3) The weight ratio of the nano-scale ceramic electrolyte to the composite gel is 1:25, and then the nano-scale ceramic electrolyte is added to the composite gel, and nitrogen is used as the carrier gas for spray drying, and the outlet eje...

Embodiment 3

[0043] (1) Set the speed of the high-energy ball mill to 1000rpm, and the milling time to 2.5 hours. The ball ink medium is made of corundum balls, and the LISICON lithium ceramic electrolyte is ground to a particle size of 250nm;

[0044] (2) Mix sodium methyl silicate, potassium silicate, citric acid, polyethylene oxide and water according to the stoichiometric ratio of 1:1:0.3:0.15:8, and add a dispersant to the system. The dispersant is three Ethanolamine or phosphoric acid ester, the amount of dispersant added is 1.5wt.% of the powder, after mixing evenly, the solution is evaporated under reduced pressure at 70°C to obtain a viscous transparent sol, and the transparent sol is vacuum-dried at 95°C for 18 hours, A composite gel of silica hydrogel and polyethylene oxide was obtained.

[0045] (3) The weight ratio of the nano-scale ceramic electrolyte to the composite gel is 1:45, and then the nano-scale ceramic electrolyte is added to the composite gel, and nitrogen is used ...

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Abstract

The invention discloses micro-capsule film ceramic solid electrolyte for a power lithium battery and a preparation method. The preparation method comprises the following steps: grinding lithium-ceramic electrolyte into a nano grade, preparing composite gel of silicon dioxide hydrogel and polyoxyethylene, putting the nano-grade ceramic electrolyte into the composite gel, performing spraying dryingso as to obtain microcapsules in which the nano-grade ceramic electrolyte is wrapped by gel, and further depositing the microcapsules according to a radio frequency magnetron sputtering method, thereby forming uniform and dense film solid electrolyte. By adopting the catalyst, the surfaces of nano-grade ceramic electrolyte micro particles are wrapped by the composite gel of silicon dioxide hydrogel and polyoxyethylene, the defect that ion channels are not stable when a ceramic film is subjected to temperature impact is overcome; in addition, the ceramic electrolyte is wrapped by the compositegel to form capsules, so that metal ions in the electrolyte are prevented from being reduced by a metal lithium, and electron conductivity can be effectively prevented. In addition, a solid electrolyte film made of the electrolyte is good in mechanical property and applicable to continuous on-scale preparation.

Description

technical field [0001] The invention relates to the field of lithium battery materials, in particular to a microcapsule film ceramic solid electrolyte for power lithium batteries and a preparation method thereof. Background technique [0002] With the process of economic globalization and the increasing demand for energy, finding new energy storage devices has become a hot spot in the field of new energy. Lithium-ion battery (Li-ion, Lithium Ion Battery): It is a secondary battery (rechargeable battery), which mainly relies on lithium ions to move between the positive and negative electrodes to work. During the charging and discharging process, Li+ intercalates and deintercalates back and forth between the two electrodes: when charging, Li+ is deintercalated from the positive electrode, intercalated into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; the opposite is true during discharge. Compared with nickel-cadmium a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/0525
CPCH01M10/0525H01M10/0565H01M2300/0082Y02E60/10
Inventor 陈庆曾军堂
Owner 中瑞丸达机电科技(北京)有限公司
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