Increasing ionic conductivity of LiTi2(PS4)3 by Zr doping

Patent metadata

Field	Value
Publication number	US-11063293-B2
Application number	US-201616314266-A
Country	US
Kind code	B2
Filing date	Oct 28, 2016
Priority date	Oct 28, 2016
Publication date	Jul 13, 2021
Grant date	Jul 13, 2021

Abstract

A compound represented by the general formula Li(Ti1-xZrx)2(PS4)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

The invention claimed is:

1. Compound represented by the general formula Li(Ti 1-x Zr x ) 2 (PS 4 ) 3 , wherein 0.01≤x≤0.25, and having peaks in positions of 2θ=15.08° (±0.50°), 15.92° (±0.50°), 18.24° (±0.50°), 2.30° (±0.50°), 23.44° (±0.50°), 24.48° (±0.50°), and 26.66° (±0.50°) in an X-ray diffraction measurement using a CuKα line.

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

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

4. A 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.

5. The method according to claim 4 , 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.

6. A method for preparing a solid-state battery comprising providing the compound according to claim 1 as a solid electrolyte.

7. A method for preparing a solid-state battery according to claim 6 , wherein the solid-state battery is an all solid-state lithium battery.

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

9. 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

• C01B25/16

  Oxyacids of phosphorus; Salts thereof (peroxyacids or salts thereof C01B15/00) · CPC title

• H01M4/485

  of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy (H01M4/505, H01M4/525 take precedence) · CPC title

• C01P2002/72

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

• H01M10/0562 Primary

  Solid materials · CPC title

• C01P2002/54

  one element only · CPC title