US2023327106A1PendingUtilityA1

Method for producing positive electrode material

Assignee: NICHIA CORPPriority: Dec 25, 2017Filed: Mar 21, 2023Published: Oct 12, 2023

Est. expiryDec 25, 2037(~11.4 yrs left)· nominal 20-yr term from priority

Inventors:Shunsuke Sawada

H01M 4/525C01G 53/50C01G 53/66H01M 4/505C01P 2006/40H01M 2004/028C01P 2002/52C01P 2002/77H01M 4/485Y02E60/10

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Claims

Abstract

A method for producing a positive electrode material for a nonaqueous secondary battery includes the steps of mixing a compound containing lithium, a compound containing nickel and BaTiO 3 to form a mixed material; and sintering the mixed material to form a lithium transition metal composite oxide.

Claims

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What is claimed is:

1 . A method for producing a positive electrode material, comprising:
preparing a complex oxide containing nickel, after the complex oxide containing nickel is prepared, mixing BaTiO3, the complex oxide containing nickel, and a compound containing lithium to form a mixed material; and sintering the mixed material to form a lithium transition metal composite oxide.

2 . The method for producing a positive electrode material of claim 1 , wherein, in the step of preparing the complex oxide, the complex oxide further comprising cobalt.

3 . The method for producing a positive electrode material of claim 2 , wherein a ratio of BaTiO3 with respect to the complex oxide containing nickel and cobalt is 0.1 mol% or higher and 2 mol% or lower.

4 . The method for producing a positive electrode material of claim 1 , wherein the lithium transition metal composite oxide has a layered structure.

5 . The method for producing a positive electrode material of claim 2 , wherein the lithium transition metal composite oxide has a layered structure.

6 . The method for producing a positive electrode material of claim 3 , wherein the lithium transition metal composite oxide has a layered structure.

7 . The method for producing a positive electrode material of claim 2 , wherein the step of preparing the complex oxide containing nickel comprises preparing a precipitate comprising the complex oxide containing nickel and cobalt.

8 . The method for producing a positive electrode material of claim 3 , wherein the step of preparing the complex oxide containing nickel comprises preparing a precipitate comprising the complex oxide containing nickel and cobalt.

9 . The method for producing a positive electrode material of claim 5 , wherein the step of preparing the complex oxide containing nickel comprises preparing a precipitate comprising the complex oxide containing nickel and cobalt.

10 . The method for producing a positive electrode material of claim 1 , wherein the lithium transition metal composite oxide is represented by composition formula (1):
where 0.95 ≤ a ≤ 1.5, 0 &lt; x ≤ 1, 0:≤ y ≤ 1, 0 ≤ z ≤ 0.35, 0.0001 ≤ v ≤ 0.02, 0 ≤ w ≤ 0.05, x + y + z + v + w ≤ 1, M1 is at least one element selected from the group consisting of Al, Mn and Mg, and M2 is at least one element selected from the group consisting of Zr, W, Ta, Nb and Mo.

11 . The method for producing a positive electrode material of claim 2 , wherein the lithium transition metal composite oxide is represented by composition formula (1):
where 0.95 ≤ a ≤ 1.5, 0 &lt; x ≤ 1, 0 &lt; y ≤ 1, 0 ≤ z ≤ 0.35, 0.0001 ≤ v ≤ 0.02, 0 ≤ w ≤ 0.05, x + y + z + v + w ≤ 1, M1 is at least one element selected from the group consisting of Al, Mn and Mg, and M2 is at least one element selected from the group consisting of Zr, W, Ta, Nb and Mo.

12 . The method for producing a positive electrode material of claim 3 , wherein the lithium transition metal composite oxide is represented by composition formula (1):
where 0.95 ≤ a ≤ 1.5, 0 &lt; x ≤ 1, 0 &lt; y ≤ 1, 0 ≤ z ≤ 0.35, 0.0001 ≤ v ≤ 0.02, 0 ≤ w ≤ 0.05, x + y + z + v + w ≤ 1, M1 is at least one element selected from the group consisting of Al, Mn and Mg, and M2 is at least one element selected from the group consisting of Zr, W, Ta, Nb and Mo.

13 . The method for producing a positive electrode material of claim 5 , wherein the lithium transition metal composite oxide is represented by composition formula (1):
where 0.95 ≤ a ≤ 1.5, 0 &lt; x ≤ 1, 0 &lt; y ≤ 1, 0 ≤ z ≤ 0.35, 0.0001 ≤ v ≤ 0.02, 0 ≤ w ≤ 0.05, x + y + z + v + w ≤ 1, M1 is at least one element selected from the group consisting of Al, Mn and Mg, and M2 is at least one element selected from the group consisting of Zr, W, Ta, Nb and Mo.

14 . The method for producing a positive electrode material of claim 1 , wherein the step of forming the lithium transition metal composite oxide includes the step of sintering the mixed material at a temperature of 700° C. or higher and 900° C. or lower.

15 . The method for producing a positive electrode material of claim 1 , wherein BaTiO3 has an average particle diameter of 0.1 µm to 5 µm.

16 . The method for producing a positive electrode material of claim 1 , wherein while the mixed material is being sintered, titanium is incorporated into particles of the lithium transition metal composite oxide at central portions thereof.

17 . The method for producing a positive electrode material of claim 1 , wherein while the mixed material is being sintered, titanium is solid-dissolved in particles of the lithium transition metal composite oxide at central portions thereof.

18 . The method for producing a positive electrode material of claim 14 , wherein while the mixed material is being sintered, titanium is incorporated into particles of the lithium transition metal composite oxide at central portions thereof.

19 . The method for producing a positive electrode material of claim 14 , wherein while the mixed material is being sintered, titanium is solid-dissolved in particles of the lithium transition metal composite oxide at central portions thereof.

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