METHOD FOR PRODUCING LITHIUM ION SECONDARY BATTERY
First Claim
1. A method for producing a lithium ion secondary battery comprising a solid solution positive electrode active material represented by the following composition formula:
- Li(2-0.5x)Mn1-xM1.5xO3 wherein x satisfies 0<
x<
1 and M is a lithium-containing transition metal oxide expressed by NiaCobMncM1d wherein 0<
a≦
0.5, 0≦
b≦
0.33, 0<
c≦
0.5, and 0≦
d≦
0.1 are satisfied, the sum of a, b, c, and d becomes 1, and M1 is an element selected from Li, Al, Zr, Ti, and Nb,the method comprising;
repeatedly charging and discharging the lithium ion secondary battery; and
the discharging of the lithium ion secondary battery being carried out at a lower current density than a current density during the charging of the lithium ion secondary battery, during each of the charging and discharging.
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Abstract
A method for producing a lithium ion secondary battery comprising the positive electrode active material of formula (1), Li(2-0.5x)Mn1-xM1.5xO3 (x satisfies 0<x<1) . . . (1) (M in the formula is a lithium-containing transition metal oxide expressed by NiaCobMncM1d (in which 0<a≦0.5, 0≦b≦0.33, 0<c≦0.5, and 0≦d≦0.1 are satisfied, the sum of a, b, c, and d becomes 1, and M1 in the formula is an element selected from Li, V, Al, Zr, Ti, Nb, Fe, Cu, Cr, Mg, and Zn)). The method comprises a step to repeat charge-discharge multiple times (charge-discharge interval), and comprises a step to discharge a at a lower current density than the current density during charge a, during the discharge of the multiple charges-discharges, or, a step to discharge b at a lower current density than the current density during charge a after the electromotive force is naturally recovered by idle b after each charge-discharge.
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Citations
15 Claims
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1. A method for producing a lithium ion secondary battery comprising a solid solution positive electrode active material represented by the following composition formula:
-
Li(2-0.5x)Mn1-xM1.5xO3 wherein x satisfies 0<
x<
1 and M is a lithium-containing transition metal oxide expressed by NiaCobMncM1d wherein 0<
a≦
0.5, 0≦
b≦
0.33, 0<
c≦
0.5, and 0≦
d≦
0.1 are satisfied, the sum of a, b, c, and d becomes 1, and M1 is an element selected from Li, Al, Zr, Ti, and Nb,the method comprising; repeatedly charging and discharging the lithium ion secondary battery; and the discharging of the lithium ion secondary battery being carried out at a lower current density than a current density during the charging of the lithium ion secondary battery, during each of the charging and discharging. - View Dependent Claims (2, 10, 11, 12, 13, 14, 15)
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3. A method for producing a lithium ion secondary battery comprising a solid solution positive electrode active material represented by the following composition formula:
-
Li(2-0.5x)Mn1-xM1.5xO3 wherein x satisfies 0<
x<
1 and M is a lithium-containing transition metal oxide expressed by NiaCobMncM1d wherein 0<
a≦
0.5, 0≦
b≦
0.33, 0<
c≦
0.5, and 0≦
d≦
0.1 are satisfied, the sum of a, b, c, and d becomes 1, and M1 is an element selected from Li, Al, Zr, Ti, and Nb,the method comprising; repeatedly charging and discharging the lithium ion secondary battery; and the discharging of the lithium ion secondary battery being carried out at a lower current density than a current density during the charging of the lithium ion secondary battery that is carried out after an electromotive force is naturally recovered by standing idle after each of the discharging of the lithium ion secondary battery. - View Dependent Claims (4, 5, 6, 7, 8, 9)
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Specification