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Preparation process for improving density of solid electrolyte

A solid electrolyte and dense technology, applied in electrolytes, circuits, electrical components, etc., to achieve the effect of improving ionic conductivity, cheap raw materials, and simple and easy methods

Inactive Publication Date: 2019-09-17
CHONGQING ACADEMY OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the present invention, the method for improving the oxygen density of the inorganic solid electrolyte tantalum doped with lithium lanthanum and zirconium by adding lithium aluminum silicate has not been reported in many documents

Method used

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  • Preparation process for improving density of solid electrolyte
  • Preparation process for improving density of solid electrolyte
  • Preparation process for improving density of solid electrolyte

Examples

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Effect test

Embodiment 1

[0026] Example 1: The preparation process of lithium aluminum silicate is as follows: accurately weigh alumina, silicon dioxide, and lithium carbonate according to the stoichiometric ratio, add ethylene glycol and mill at 300 rpm for 20 hours, dry at 65°C, and then roast to obtain lithium aluminum silicate .

[0027] Preparation of lithium aluminum silicate adding tantalum doped lithium lanthanum zirconium oxygen electrolyte sheet: add lithium carbonate, tantalum pentoxide, zirconia, lanthanum oxide accurately weighed according to the stoichiometric ratio, add ethylene glycol and ball mill at 300rpm for 10h, 65℃ After drying, roast at 900°C for 10h, add 0.5%wt. lithium aluminum silicate ball mill to the obtained powder, ball mill for 20h, revolution speed 300rpm, add binder 2.7%PVB ball mill after drying at 65°C, 30Mpa after drying The tablet was pressed down for 2 minutes to obtain an electrolyte precursor sheet with a diameter of 12.7 mm. It was fired at 650°C for 8 hours to...

Embodiment 2

[0029] Example 2: The preparation process of lithium aluminum silicate is as follows: Accurately weigh alumina, silicon dioxide, and lithium carbonate according to the stoichiometric ratio, add ethylene glycol and ball mill at a revolution speed of 300 rpm for 20 hours, dry at 65°C and then roast to obtain silicic acid Aluminum Lithium.

[0030] Preparation of lithium aluminum silicate adding tantalum doped lithium lanthanum zirconium oxygen electrolyte sheet: add lithium carbonate, tantalum pentoxide, zirconia, lanthanum oxide accurately weighed according to the stoichiometric ratio, add ethylene glycol and ball mill at 300rpm for 10h, 65℃ After drying, roast at 900°C for 10 hours, add 1%wt. lithium aluminum silicate ball mill to the obtained powder, ball mill for 20h, revolution speed 300rpm, add binder 2.7%PVB ball mill after drying at 65°C, 30Mpa after drying The tablet was pressed down for 2 minutes to obtain an electrolyte precursor sheet with a diameter of 12.7 mm. It w...

Embodiment 3

[0032] Example 3: The preparation process of lithium aluminum silicate is as follows: accurately weigh alumina, silicon dioxide, and lithium carbonate according to the stoichiometric ratio, add ethylene glycol and mill at 300 rpm for 20 hours, dry at 65°C and then roast to obtain lithium aluminum silicate .

[0033] Preparation of aluminum silicate adding tantalum-doped lithium-lanthanum-zirconium-oxygen electrolyte sheet: adding tantalum carbonate, tantalum pentoxide, zirconia, and lanthanum oxide accurately weighed according to the stoichiometric ratio, adding ethylene glycol and ball milling at 300rpm for 10h, 65°C After drying, roast at 900°C for 10 hours, add 4% wt. lithium aluminum silicate ball mill to the obtained powder, ball mill for 20 hours, revolution speed 300rpm, add binder 2.7% PVB ball mill after drying at 65°C, 30Mpa after drying The tablet was pressed down for 2 minutes to obtain an electrolyte precursor sheet with a diameter of 12.7 mm. It was fired at 650°...

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Abstract

The invention relates to a preparation process for improving the density of a solid electrolyte to enhance the conductivity of lithium ion. The main component of an additive is lithium aluminum silicate, and the content of the lithium aluminum silicate is 0.5-4 wt%. The preparation process comprises the following steps of: adding lithium aluminum silicate into presintered tantalum doped lithium lanthanum zirconium oxide, performing ball-milling, adding a binder for ball-milling again, performing tabletting, performing sintering at a low temperature to remove the binder, and performing burning in the mother powder to obtain a final electrolyte. The density of the obtained electrolyte sheet reaches 91.5%, and the lithium ion conductivity can reach 5.14*10<-4>S / cm (298K) at a normal temperature.

Description

technical field [0001] The present invention mainly relates to the technical field of an all-solid-state lithium-ion battery. Specifically, the present invention relates to a preparation method for increasing the density of a solid-state electrolyte and thereby increasing the ion conductivity. Background technique [0002] Compared with the current liquid lithium-ion battery, the all-solid-state battery has the characteristics of safety, high energy density, long cycle life, and wide operating temperature range, and it will be the main power source of new energy vehicles in the future. Among them, solid-state electrolyte is the key to realize all-solid-state batteries. Solid-state electrolytes include polymer solid-state electrolytes represented by PEO, inorganic solid-state electrolytes, and polymer-inorganic composite solid-state electrolytes. All-solid-state lithium-ion batteries using inorganic solid electrolytes have The advantages of high thermal stability, non-flammab...

Claims

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Application Information

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IPC IPC(8): H01M10/0562H01M10/0525
CPCH01M10/0525H01M10/0562H01M2300/0071Y02E60/10
Inventor 薛雯娟王联程仁菊杨亚萍姜爱民
Owner CHONGQING ACADEMY OF SCI & TECH
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