LOWLY SYMMETRIC GARNET-RELATED STRUCTURED SOLID ELECTROLYTE AND LITHIUM SECONDARY BATTERY

Title:

LOWLY SYMMETRIC GARNET-RELATED STRUCTURED SOLID ELECTROLYTE AND LITHIUM SECONDARY BATTERY

Document Type and Number:

WIPO Patent Application WO/2017/203954

Kind Code:

A1

Abstract:

Provided are: a solid electrolyte material having a high ionic conductivity; and an all-solid-state lithium-ion secondary battery using said solid electrolyte material. This solid electrolyte material has a garnet-related structured crystalline body which has a chemical composition represented by Li7-x-yLa3Zr2-x-yTaxNbyO12 (0.05≤x+y≤0.2, x≥0, y≥0), and which is of orthorhombic system and has the crystallographic space group of Ibca. The solid electrolyte material has a lithium ion conductivity of at least 1.0×10-4 S/cm at 25°C. Further, in this solid electrolyte material, the lattice constants are 1.29 nm ≤ a ≤ 1.32 nm, 1.26 nm ≤ b ≤ 1.29 nm, and 1.29 nm ≤ c ≤1.32 nm; and three 16f sites and one 8d site in the crystal structure are occupied by lithium ions. The all-solid-state lithium-ion secondary battery according to the present invention has a positive electrode, a negative electrode, and a solid electrolyte, which comprises this solid electrolyte material.

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Inventors:

HAMAO NAOKI (JP)
KATAOKA KUNIMITSU (JP)
AKIMOTO JUNJI (JP)

Application Number:

PCT/JP2017/017233

Publication Date:

November 30, 2017

Filing Date:

May 02, 2017

Export Citation:

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Assignee:

AIST (JP)

International Classes:

C01G35/00; C01G33/00; C30B13/28; C30B29/22; H01B1/06; H01B1/08; H01B13/00; H01M10/052; H01M10/0562

Domestic Patent References:

WO2016068040A1

2016-05-06

Foreign References:

JP2016072210A

2016-05-09

Other References:

WANG, YUXING ET AL.: "High Ionic Conductivity Lithium Garnet Oxides of Li7-xLa3Zr2-xTaxO12 Compositions", ELECTROCHEMICAL AND SOLID-STATE LETTERS, vol. 15, no. 5, 29 February 2012 (2012-02-29), pages A68 - A71, XP055203215, DOI: doi:10.1149/2.024205esl