Lithium ion conductive solid electrolyte and a method for manufacturing the same

A solid electrolyte, ion conductivity technology, applied in the field of electrochemical components, can solve the problems of lithium ion migration resistance increase, high output power battery, easy to crack, etc., to achieve good charge and discharge cycle characteristics, high battery capacity, durability high effect

Inactive Publication Date: 2008-05-07
OHARA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Even in such a case, since there are gaps in the solid electrolyte, the interfacial contact between the electrode and the solid electrolyte is not sufficient, so there is a problem that the transfer resistance of lithium ions at the electrode-electrolyte interface becomes large, and it becomes a problem to obtain high output power. battery barrier
Furthermore, the air in the voids of the solid electrolyte expands and contracts due to temperature changes, locally generates stress, and is prone to cracks and defects. Therefore, it also becomes an obstacle to a battery that can be used safely in a wide temperature range.
[0006] Patent Document 1 discloses a battery structure that improves the adhesion at the interface of different layers, but requires a patterning process and requires a huge manufacturing cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0153] Use H 3 PO 4 , Al(PO 3 ) 3 , Li 2 CO 3 , SiO 2 、TiO 2 As a raw material, 35.0% P in terms of mol% in terms of oxides 2 o 5 , 7.5% Al 2 o 3 , 15.0% Li 2 O, 38.0%TiO 2 , 4.5% SiO 2 Such a composition was weighed and uniformly mixed, then put into a platinum tank, and heated and melted in an electric furnace at 1500° C. while stirring the molten glass for 4 hours. Then, the glass melt was dropped into running water to obtain flaky glass, and the glass was heat-treated at 950° C. for 12 hours for crystallization, thereby obtaining the target glass ceramics. The precipitated crystal phase was confirmed by powder X-ray diffraction 1+x+y Al x Ti 2-x Si y P 3-y o 12 (0≤x≤0.4, 0-3 Scm -1 .

[0154]The obtained powder was filled in a cylindrical rubber mold having an inner diameter of 60 mm in diameter and an inner height of 50 mm, and sealed after vacuum degassing. Put the sealed rubber mold into a wet CIP device, and pressurize at a pressure of 2t for 15 m...

Embodiment 2

[0158] The glass before crystallization obtained in Example 1 was pulverized by a ball mill to obtain a glass powder having an average particle diameter of 1.5 μm and a maximum particle diameter of 9 μm. A slurry was prepared by dispersing and mixing water as a solvent together with a polyurethane resin and a dispersant, and was molded by a doctor blade method, and dried to remove the solvent to obtain a plate-like molded body. Both sides of the molded body were sandwiched between rigid polyethylene plates, vacuum degassed and sealed, and densified by pressurizing at a pressure of 2 t for 10 minutes in a CIP apparatus. Organic substances were removed in the air at 400°C, crystallized at 700°C, and then fired at 1050°C to obtain an ion-conductive inorganic solid.

[0159] The ionic conductivity is 3.8×10 -4 Scm -1 , the porosity is 6.0vol%.

[0160] Making the presence of silica (SiO 2 ) as solid electrolytes of materials of different composition. In the production, the sa...

Embodiment 3

[0164] Using water as a solvent, the glass ceramic powder with an average particle diameter of 2 μm obtained in Example 1 was dispersed and mixed with an acrylic resin and a dispersant to prepare a slurry, and formed into a sheet by a doctor blade method, and dried to remove the solvent. A sheet-like molded body was obtained. Eight sheets of this molded body were stacked, both sides of which were sandwiched between hard polyethylene plates, vacuum degassed and sealed, and laminated and crimped by applying pressure at a pressure of 2t for 10 minutes in a CIP apparatus. The laminated molded body was placed in an electric furnace, organic matter was removed in the air at 400°C, and then fired at 1060°C to obtain an ion-conductive inorganic solid. The ionic conductivity is 3.4×10 -4 Scm -1 , the porosity is 5.4vol%.

[0165] A solid electrolyte containing a silica-based inorganic substance as a material of a different composition in the obtained ion-conductive inorganic solid w...

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Abstract

A lithium ion conductive solid electrolyte includes an ion conductive inorganic solid and, in a part or all of the pores of the inorganic solid, a material of a composition which is different from the composition of the inorganic solid exists. A method for manufacturing this lithium ion conductive solid electrolyte includes a step of forming an ion conductive inorganic solid to a predetermined form and a step of thereafter filling a material of a composition which is different from the composition of the inorganic solid in pores of the inorganic solid.

Description

technical field [0001] The present invention mainly relates to a lithium ion conductive solid electrolyte useful as an electrochemical element, a method for producing the same, and an electrochemical element having the solid electrolyte. Background technique [0002] Conventionally, inorganic solid electrolytes have been studied for application to various electrochemical devices because they are materials that are safe and have little burden on the environment. In particular, in the field of energy, various researches and developments have been conducted in anticipation of application to electrolyte materials for high-capacity lithium primary batteries and lithium secondary batteries. [0003] In the case of a lithium primary battery composed of a lithium metal electrode and an air electrode, when the moisture generated in the air electrode passes through the solid electrolyte as a separator and reaches the lithium electrode side, it is dangerous to catch fire, so it is nece...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M6/18H01M10/36H01M12/06H01B1/00C03C8/08H01B1/06H01B13/00H01G9/00H01G11/14H01G11/56H01L31/04H01M10/052H01M10/0562H01M14/00
CPCY02E60/12H01M6/185H01M10/0562C03C10/0009C03C4/18H01M6/188H01M2300/0071H01M10/052H01M2300/0091Y02E10/50H01M2300/0068C04B35/447C04B35/62665C04B2235/3203C04B2235/3217C04B2235/3232C04B2235/3286C04B2235/3287C04B2235/3418C04B2235/5292C04B2235/5436C04B2235/77Y02E60/10
Inventor 印田靖
Owner OHARA
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