Increasing ionic conductivity of liti2(ps4)3 by zr doping

Patent metadata

Field	Value
Publication number	US-2019229369-A1
Application number	US-201616314266-A
Country	US
Kind code	A1
Filing date	Oct 28, 2016
Priority date	Oct 28, 2016
Publication date	Jul 25, 2019
Grant date	—

Abstract

A compound represented by the general formula Li(Ti 1-x Zr x ) 2 (PS 4 ) 3 , wherein 0.01≤x≤0.25, and found to have high ionic conductivity; a use of the compound as a solid electrolyte, in particular in an all solid-state lithium battery.

First claim

1 . Compound represented by the general formula Li(Ti 1-x Zr x ) 2 (PS 4 ) 3 , wherein 0.01≤x≤0.25.

2 . Compound according to claim 1 , wherein 0.05≤x≤0.15.

3 . Compound according to claim 1 , wherein x=0.1.

4 . Compound according to claim 1 , having peaks in positions of 2θ=15.08° (±0.50°), 15.92° (±0.50°), 18.24° (±0.50°), 2.30° (±0.50°), 23.440 (±0.50°), 24.48° (±0.50°), and 26.66° (±0.50°) in an X-ray diffraction measurement using a CuKα line.

5 . Method for preparing the compound according to claim 1 , comprising the steps of:
(a) providing a mixture of lithium sulfide Li 2 S, phosphorus sulfide P 2 S 5 , aluminum sulfide ZrS 2 and titanium sulfide TiS 2 ; (b) subjecting the mixture prepared in step (a) to a preliminary reaction step through mechanical milling or melt-quenching to produce an intermediate amorphous sulfide mixture; (c) subjecting the mixture prepared in (b) to a heat treatment step at a maximum plateau temperature of at least 350° C. and less than 500° C.

6 . Method according to claim 5 , further comprising the following steps of surface treatment:
(d) compressing the compound provided in step (c) to form a compressed powder layer; and (e) sintering the compound obtained as a compressed powder layer in step (d) at a temperature of at least 200° C. and at most 400° C.

7 . Use of the compound according to claim 1 as a solid electrolyte.

8 . Use of the compound according to claim 1 as a solid electrolyte in an all solid-state lithium battery.

9 . Solid-state battery comprising the compound according to claim 1 as a solid electrolyte.

10 . All-solid state lithium battery comprising the following elements:
a positive electrode active material layer; a solid electrolyte layer; a negative electrode active material layer,
wherein the solid electrolyte layer contains the compound according to claim 1 .

Assignees

• Toyota Motor Europe

Inventors

• Katoh Yuki
• Hautier Geoffroy
• Miglio Anna

Classifications

• C01P2002/54

  one element only · CPC title

• H01M10/0562 Primary

  Solid materials · CPC title

• C01G23/002

  Compounds containing titanium, with or without oxygen or hydrogen, and containing two or more other elements (C01G23/001, C01G23/003 take precedence) · CPC title

• H01M10/052

  Li-accumulators · CPC title

• C01P2002/72

  by d-values or two theta-values, e.g. as X-ray diagram · CPC title