Alkali metal-containing oxide, positive electrode active substance, electrode, and battery

Patent metadata

Field	Value
Publication number	US-2025357479-A1
Application number	US-202318869554-A
Country	US
Kind code	A1
Filing date	May 19, 2023
Priority date	May 30, 2022
Publication date	Nov 20, 2025
Grant date	—

Abstract

An alkali metal-containing oxide of the present disclosure has a spinel structure and a composition represented by the following formula (1). In an X-ray diffraction chart measured at 25° C. using a CuKα ray, a peak having a half width of 0.5° to 5° is observed within a range of 40° to 45°.

(In the formula (1), 1.1<x≤2.8, 0.8≤a<1.9, 0.05<b≤0.6, 1.0≤a+b<2.0, 0≤c<0.2, 0≤d<1.0, 0≤e<1.0,
A is an alkali metal element, M′ is at least one element from Ti, Cr, Mn, Fe, Co, Ni and Cu, M″ is at least one from Si, P, S, Ge and V, Z is an element of Group II to Group XVI except oxygen, M′ and M″, and X is a halogen element.)

First claim

1 . An alkali metal-containing oxide having a spinel structure and having a composition represented by the following formula (1),
wherein, in an X-ray diffraction chart measured regarding the alkali metal-containing oxide at 25° C. using a CuKα ray, a peak having a half width of 0.5° to 5° at 2θ is observed within a range of 40° to 45° at 2θ,

(in the formula (1), 1.1<x≤2.8, 0.8≤a<1.9, 0.05<b≤0.6, 1.0≤a+b<2.0, 0≤c<0.2, 0≤d<1.0, 0≤e<1.0,
A is an alkali metal element,
M′ is at least one element selected from the group consisting of Ti, Cr, Mn, Fe, Co, Ni and Cu,
M″ is at least one selected from the group consisting of Si, P, S, Ge and V,
Z is an element of Group II to Group XVI in a periodic table except oxygen, M′ and M″, and
X is a halogen element).

2 . The alkali metal-containing oxide according to claim 1 ,
wherein, in a case where an electrochemical cell including an electrode containing the alkali metal-containing oxide, a lithium-metal auxiliary electrode and an electrolytic solution containing a lithium salt disposed between the electrode and the auxiliary electrode is produced, the electrochemical cell is charged up to 4.8 V based on Li/Li + , and discharging is then performed to 1.5 V, x in the formula (1) is within a range of 2.2 to 2.8.

3 . The alkali metal-containing oxide according to claim 1 ,
wherein, in the formula (1), A includes Li.

4 . The alkali metal-containing oxide according to claim 1 ,
wherein, in the formula (1), M″ includes V.

5 . The alkali metal-containing oxide according to claim 1 ,
wherein, in the formula (1), 1.1<x≤2.0 is satisfied.

6 . An electrode comprising:
the alkali metal-containing oxide according to claim 1 .

7 . A battery comprising:
the electrode according to claim 6 as a positive electrode; and a negative electrode containing lithium.

8 . A positive electrode active substance comprising:
a composite oxide containing an alkali metal element, an element M′ and an element M″, wherein 8 to 15 mass % of the alkali metal element is contained, 32 to 57 mass % of the element M′, which is at least one selected from the group consisting of Ti, Cr, Mn, Fe, Co, Ni and Cu, is contained, and 3 to 30 mass % of the element M″, which is at least one selected from the group consisting of Si, P, S, Ge and V, is contained, in an X-ray diffraction chart measured regarding the positive electrode active substance at 25° C. using a CuKα ray, a peak pattern belonging to the spinel structure derived from the composite oxide is observed, and a peak having a half width of 0.5° to 5° is observed within a range of 40° to 45° at 2θ.

9 . The alkali metal-containing oxide according to claim 1 , having an amorphous phase.

Assignees

• Sumitomo Chemical Co
• Univ Kyoto

Inventors

• YAMABAYASHI Tsutomu
• Kageyama Hiroshi

Classifications

• H01M10/052

  Li-accumulators · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · 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

• C01G45/1235

  of the type (Mn2O4)2-, e.g. Li2Mn2O4 or Li2(MxMn2-x)O4 · CPC title

• C01G45/1242

  of the type (Mn2O4)-, e.g. LiMn2O4 or Li(MxMn2-x)O4 · CPC title