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Solid electrolyte material, battery device and all-solid lithium secondary battery

A technology of solid electrolyte and electrolyte layer, which is applied to batteries with solid electrolytes, non-aqueous electrolyte batteries, non-aqueous electrolyte batteries, etc., can solve the problems of hard solid electrolyte materials and difficulty in reliably preparing electrodes.

Active Publication Date: 2009-05-06
SEIKO EPSON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the solid electrolyte material used is very brittle and hard, it is very difficult to reliably prepare electrodes each with a good shape and a large surface area.

Method used

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  • Solid electrolyte material, battery device and all-solid lithium secondary battery
  • Solid electrolyte material, battery device and all-solid lithium secondary battery
  • Solid electrolyte material, battery device and all-solid lithium secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] First, the Li 2 S-SiS 2 -Li 3 PO 4 The constituted lithium ion conductive glass is used as a sulfide-based lithium ion conductor as a starting material of a solid electrolyte material. In addition, α-alumina is used as the insulating fine particles. Then, according to the method described above, a solid electrolyte material was prepared by mixing lithium ion conductive glass with α-alumina at different ratios by weight. Then, in each solid electrolyte material, lithium ion conductivity was measured using a predetermined method. The results are shown in figure 1 middle.

[0075] figure 1 is a graph showing the relationship between the added amount of α-alumina and the lithium ion conductivity of the prepared solid electrolyte material. At this point, it should be noted that, figure 1 All Li-ion conductivity values ​​shown in are measured at room temperature.

[0076] Such as figure 1 As shown in , in a solid electrolyte using a solid electrolyte material i...

Embodiment 2

[0092] First, the Li 2 S-Ge 2 S 2 -P 2 S 5 The constituted lithium-ion-conducting crystalline material is used as a sulfide-based lithium-ion conductor as a starting material for a solid electrolyte material. In addition, α-alumina is used as the insulating fine particles. Then, according to the method described above, a solid electrolyte material was prepared by mixing the crystalline material with 5% by weight of α-alumina relative to the crystalline material.

[0093] Then, by using a predetermined method, lithium ion conductivity of the prepared solid electrolyte material and starting material was measured. As a result, the lithium ion conductivity of the as-prepared solid electrolyte material was 4.3×10 -3 S / cm. On the other hand, the Li-ion conductivity of the starting material is 2.5 × 10 -3 S / cm. The Li-ion conductivity of the as-prepared solid electrolyte material is much higher than that of the starting material.

Embodiment 3

[0095] First, the Li 2 S-P 2 S 5 The constituted lithium ion conductive glass is used as a sulfide-based lithium ion conductor as a starting material of a solid electrolyte material. In addition, α-alumina is used as the insulating fine particles. Then, according to the method described above, the lithium ion conductive glass was mixed with α-alumina at a weight ratio of 5% with respect to the lithium ion conductive glass to prepare a solid electrolyte material.

[0096] Then, by using a predetermined method, lithium ion conductivity of the prepared solid electrolyte material and starting material was measured. As a result, the lithium ion conductivity of the prepared solid electrolyte material was 0.75×10 -3 S / cm. On the other hand, the Li-ion conductivity of the starting material is 0.25 × 10 -3 S / cm. The Li-ion conductivity of the as-prepared solid electrolyte material is much higher than that of the starting material.

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Abstract

A solid electrolyte material of conducting a lithium ion comprises a sulfide-based lithium-ion conductor and alpha-alumina. Such a solid electrolyte material exhibits superior lithium-ion conductivity. Further, a battery device provided with such a solid electrolyte material is also provided. Furthermore, an all-solid lithium-ion secondary battery provided with such a battery device is also provided.

Description

[0001] Cross References to Related Applications [0002] This application claims priority from Japanese Patent Application No. 2007-230853 filed on September 5, 2007, the entire contents of which are hereby expressly incorporated by reference. technical field [0003] The present invention relates to a solid electrolyte conducting lithium ions, a battery device and an all-solid lithium secondary battery, and more particularly, to a solid electrolyte conducting lithium ions, a battery device using the solid electrolyte, and a battery equipped with the device for an all-solid Li-ion secondary battery. Background technique [0004] In recent years, with the development of portable equipment such as personal computers and portable phones, demand for small-sized and light-weight secondary batteries as power sources for portable equipment has shown a significant increase. [0005] Among the secondary batteries, it is particularly predicted that the lithium secondary battery real...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/36H01B1/06H01M10/052H01M10/0562
CPCH01M10/0562Y02E60/122Y02E60/12Y02E60/10H01M6/18
Inventor 近藤繁雄竹内安正筱原祐治川濑健夫
Owner SEIKO EPSON CORP
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