Positive electrode material for lithium ion secondary battery and method of manufacturing the positive electrode material for lithium ion secondary battery
A method of manufacturing a positive electrode material for a lithium ion secondary battery includes: firing a mixture containing a lithium compound, a nickel-containing complex compound, and a molybdenum compound, to obtain first particles containing a lithium transition metal complex oxide having a composition in which a ratio of a number of moles of nickel to a total number of moles of metals other than lithium is greater than 0.6 and less than 1; and bringing the first particles into contact with a liquid medium in such that a solid content concentration of the first particles is in a range of 20 mass % to 80 mass % to remove a part of molybdenum element contained in the first particles to obtain second particles.
1 . A method of manufacturing a positive electrode material for a lithium ion secondary battery comprising:
firing a mixture containing a lithium compound, a nickel-containing complex compound, and a molybdenum compound, to obtain first particles containing a lithium transition metal complex oxide having a composition in which a ratio of a number of moles of nickel to a total number of moles of metals other than lithium is greater than 0.6 and less than 1; and
bringing the first particles into contact with a liquid medium in such that a solid content concentration of the first particles is in a range of 20 mass % to 80 mass % to remove a part of molybdenum element contained in the first particles to obtain second particles,
wherein the lithium transition metal complex oxide contained in the second particles has a composition in which a ratio of a number of moles of molybdenum to a total number of moles of metals other than lithium is in a range from 0.004 to 0.015.
2 . The method of manufacturing a positive electrode material for a lithium ion secondary battery according to claim 1 , wherein the lithium transition metal complex oxide contained in the second particles has the composition in which a ratio of a number of moles of nickel to a total number of moles of metals other than lithium is 0.7 or greater and less than 1.
3 . The method of manufacturing a positive electrode material for a lithium ion secondary battery according to claim 1 , wherein the lithium transition metal complex oxide contained in the second particles has the composition in which a ratio of a number of moles of nickel to a total number of moles of metals other than lithium is 0.8 or greater and less than 0.95.
4 . The method of manufacturing a positive electrode material for a lithium ion secondary battery according to claim 1 , wherein the lithium transition metal complex oxide contained in the second particles is represented by Composition Formula (1):
Li p Ni x Co y M 1 z M 2 u O 2+α (1)
where 0.95≤p≤1.5, 0.6<x<1, 0≤y<0.4, 0≤z<0.4, 0≤u≤0.1, −0.3≤α≤0.3, and x+y+z+u≤1, and M 1 represents at least one of Mn or Al; and M 2 represents at least one selected from the group consisting of Na, K, Mg, Ca, Ba, Y, Ti, Zr, Nb, Ta, Cr, Mo, W, Fe, Cu, Zn, Cd, Ga, Si, Sn, P, Bi, La, Ce, Nd, Sm, Er, and Lu.
5 . The method of manufacturing a positive electrode material for a lithium ion secondary battery according to claim 1 , wherein, in the step of obtaining the first particles, the lithium transition metal complex oxide contained in the first particles has the composition in which a ratio of a number of moles of molybdenum to the total number of moles of metals other than lithium is greater than 0.005 and 0.02 or less.
6 . The method of manufacturing a positive electrode material for a lithium ion secondary battery according to claim 1 , wherein, in the step of obtaining the first particles, the mixture is fired at a temperature in a range from 800° C. to 1000° C.
7 . The method of manufacturing a positive electrode material for a lithium ion secondary battery according to claim 1 , wherein, in the step of obtaining the second particles, the first particles are brought into contact with the liquid medium, then further are mixed with a boron compound, and are subject to a heat treatment.
8 . The method of manufacturing a positive electrode material for a lithium ion secondary battery according to claim 1 , wherein the nickel-containing complex compound is a complex oxide containing at least nickel and cobalt.
9 . The method of manufacturing a positive electrode material for a lithium ion secondary battery according to claim 1 , wherein the liquid medium is a solution containing at least one of sodium or lithium.
10 . The method of manufacturing a positive electrode material for a lithium ion secondary battery according to claim 1 , wherein a ratio of a number of moles of molybdenum to the total number of moles of metals other than lithium in the composition of the lithium transition metal complex oxide contained in the second particles is in a range from 0.35 to 0.8 with respect to a ratio of a number of moles of molybdenum to the total number of moles of metals other than lithium in the composition of the lithium transition metal complex oxide contained in the first particles.
11 . A method of manufacturing a positive electrode material for a lithium ion secondary battery comprising:
firing a mixture containing a lithium compound, a nickel-containing complex compound, and a molybdenum compound, to obtain first particles containing a lithium transition metal complex oxide having a composition in which a ratio of a number of moles of nickel to a total number of moles of metals other than lithium is greater than 0.6 and less than 1; and
bringing the first particles into contact with a liquid medium in such that a solid content concentration of the first particles is in a range of 20 mass % to 80 mass % to remove a part of molybdenum element contained in the first particles to obtain second particles,
wherein a ratio of a number of moles of molybdenum to the total number of moles of metals other than lithium in a composition of the lithium transition metal complex oxide contained in the second particles is in a range from 0.35 to 0.8 with respect to a ratio of a number of moles of molybdenum to the total number of moles of metals other than lithium in the composition of the lithium transition metal complex oxide contained in the first particles.
12 . The method of manufacturing a positive electrode material for a lithium ion secondary battery according to claim 11 , wherein the lithium transition metal complex oxide contained in the second particles has the composition in which a ratio of a number of moles of nickel to the total number of moles of metals other than lithium is 0.7 or greater and less than 1.
13 . The method of manufacturing a positive electrode material for a lithium ion secondary battery according to claim 11 , wherein the lithium transition metal complex oxide contained in the second particles has the composition in which a ratio of a number of moles of nickel to the total number of moles of metals other than lithium is 0.8 or greater and less than 0.95.
14 . The method of manufacturing a positive electrode material for a lithium ion secondary battery according to claim 11 , wherein the lithium transition metal complex oxide contained in the second particles is represented by Composition Formula (1):
Li p Ni x Co y M 1 z M 2 u O 2+α (1)
where 0.95≤p≤1.5, 0.6<x<1, 0≤y<0.4, 0≤z<<0.4, 0≤u≤0.1, −0.3≤α≤0.3, and x+y+z+u≤1, and M 1 represents at least one of Mn or Al; and M 2 represents at least one selected from the group consisting of Na, K, Mg, Ca, Ba, Y, Ti, Zr, Nb, Ta, Cr, Mo, W, Fe, Cu, Zn, Cd, Ga, Si, Sn, P, Bi, La, Ce, Nd, Sm, Er, and Lu.
15 . The method of manufacturing a positive electrode material for a lithium ion secondary battery according to claim 11 , wherein, in the step of obtaining the first particles, the lithium transition metal complex oxide contained in the first particles has the composition in which the ratio of the number of moles of molybdenum to the total number of moles of metals other than lithium is greater than 0.005 and 0.02 or less.
16 . The method of manufacturing a positive electrode material for a lithium ion secondary battery according to claim 11 , wherein, in the step of obtaining the first particles, the mixture is fired at a temperature in a range from 800° C. to 1000° C.
17 . The method of manufacturing a positive electrode material for a lithium ion secondary battery according to claim 11 , wherein, in the step of obtaining the second particles, the first particles are brought into contact with the liquid medium, then further are mixed with a boron compound, and are subject to a heat treatment.
18 . The method of manufacturing a positive electrode material for a lithium ion secondary battery according to claim 11 , wherein the nickel-containing complex compound is a complex oxide containing at least nickel and cobalt.
19 . The method of manufacturing a positive electrode material for a lithium ion secondary battery according to claim 11 , wherein the liquid medium is a solution containing at least one of sodium or lithium.