Lithium transition metal halides

Patent metadata

Field	Value
Publication number	US-2022289590-A1
Application number	US-202017774166-A
Country	US
Kind code	A1
Filing date	Nov 5, 2020
Priority date	Nov 7, 2019
Publication date	Sep 15, 2022
Grant date	—

Abstract

Described are a solid material which has ionic conductivity for lithium ions, a composite comprising said solid material and a cathode active material, a process for preparing said solid material, a solid structure selected from the group consisting of a cathode, an anode and a separator for an electrochemical cell comprising the solid material, and an electrochemical cell comprising such solid structure.

First claim

1 . A solid material having a composition according to general formula (I)
Li 3−n*x M 1−x M′ x X y   (I)
wherein M is Er; M′ is one or more selected from the group consisting of Ti, Zr, Hf, Nb and Ta; X is one or more selected from the group consisting of halides and pseudohalides; 0.12≤x≤0.42; 5.8≤y≤6.2; n is the difference between the valences of M′ and M.

2 . The solid material according to claim 1 , wherein 5.85≤y≤6.15, preferably 5.9≤y≤6.1.

3 . The solid material according to claim 1 , wherein
M′ is one or more of Ti, Zr and Hf; and X is one or more selected from the group consisting of Cl, Br and I; and 0.12≤x≤0.42, preferably 0.2≤x≤0.4.

4 . The solid material according to claim 3 , wherein
M′ is Zr, and X is Cl.

5 . The solid material according to claim 1 , wherein
M′ is one or both of Nb and Ta; and X is one or more selected from the group consisting of Cl, Br and I; and 0.15≤x≤0.35.

6 . The solid material according to claim 1 , wherein the solid material is
crystalline and has an orthorhombic structure in space group Pnma, or is a glass, or is a glass-ceramics.

7 . A composite comprising
the solid material according to claim 1 , and a cathode active material, wherein the cathode active material preferably comprises one or more compounds of formula (II):
Li 1+t A 1−t O 2   (II),

wherein A comprises nickel and one or both members of the group consisting of cobalt and manganese, and optionally one or more further transition metals not selected from the group consisting of nickel, cobalt and manganese, wherein said further transition metals are preferably selected from the group consisting of molybdenum, titanium, tungsten, zirconium, one or more elements selected from the group consisting of aluminum, barium, boron and magnesium, wherein at least 50 mole-% of the transition metal of A is nickel; t is a number in the range of from −0.05 to 0.2.

8 . The composite according to claim 7 , wherein the solid material and the cathode active material are admixed with each other.

9 . A process for preparing a solid material according to claim 1 ,
the process comprising a) providing a reaction mixture comprising the precursors
(1) one or more compounds selected from the group consisting of halides and pseudohalides of lithium; and
(2) one or more compounds selected from the group consisting of halides and pseudohalides of Er; and
(3) one or more compounds selected from the group consisting of halides and pseudohalides of elements M′ selected from the group consisting of Ti, Zr, Hf, Nb and Ta;
wherein in said reaction mixture the molar ratio of Li, M, M′, halides and pseudohalides matches general formula (I); b) reacting the reaction mixture to obtain a solid material having a composition according to general formula (I).

10 . The process according to claim 9 , wherein the precursors are
(1) one or more compounds LiX; and (2) one or more compounds MX 3 wherein M is Er; and (3) one or more compounds from the group consisting of
compounds M′X 4 wherein M′ is one or more of Ti, Zr and Hf, and
compounds M′X 5 wherein M′ is one or both of Nb and Ta;
wherein in each of precursors (1) to (3), independently from the other precursors, X is one or more selected from the group consisting of Cl, Br and I, preferably Cl; wherein the molar ratio of Li, M, M′ and X matches general formula (I).

11 . The process according to claim 9 , further comprising
a) preparing or providing a solid reaction mixture comprising the precursors (1), (2) and (3) b) heat-treating the reaction mixture in a temperature range of 150° C. to 850° C. for a total duration of 1 hour to 24 hours so that a reaction product is formed, and cooling the reaction product so that a solid material having a composition according to general formula (I) is obtained.

12 . A solid structure for an electrochemical cell, wherein the solid structure is selected from the group consisting of cathode, anode and separator, wherein the solid structure for an electrochemical cell comprises the solid material according to claim 1 .

13 . A solid structure for an electrochemical cell, wherein the solid structure is a cathode, wherein the cathode comprises a composite according to claim 7 .

14 . The electrochemical cell comprising a solid material according to claim 6 .

15 . The electrochemical cell according to claim 14 , wherein the solid material is a component of a solid structure as defined in claim 12 .

Assignees

• Basf Se
• Univ Waterloo

Inventors

• Keonho Park
• Nazar Linda
• Kulisch Jörn
• Wu Xiaohan

Classifications

• 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

• C01G27/006

  Compounds containing hafnium, with or without oxygen or hydrogen, and containing two or more other elements · CPC title

• H01M4/62

  Selection of inactive substances as ingredients for active masses, e.g. binders, fillers · CPC title

• H01M10/052

  Li-accumulators · CPC title

• C01G25/04 Primary

  Halides · CPC title