Non-Homogenous Positive Electrode Materials Combining High Safety and High Power in a Li Rechargeable Battery
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Abstract
The invention relates to a LiaNixCoyMzO2±eAf composite oxide for use as a cathode material in a rechargeable battery, with a non-homogenous Ni/Al ratio in the particles, allowing excellent power and safety properties when used as positive electrode material in Li battery. More particularly, in the formula 0.9<a<1.1, 0.3≦x≦0.9, 0≦y≦0.4, 0<z≦0.35, e=0, 0≦f≦0.05 and 0.9<(x+y+z+f)<1.1; M consists of either one or more elements from the group Al, Mg and Ti; A consists of either one or more elements from the group S and C. The powder has a particle size distribution defining a D10, D50 and D90; and said x and z parameters varying with the particles size of said powder, and is characterized in that either one or both of: x1−x2≧0.010 and z2−z1≧0.010; x1 and z1 being the parameters corresponding to particles having a particle size D90; and x2 and z2 being the parameters corresponding to particles having a particle size D10.
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Citations
22 Claims
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1-10. -10. (canceled)
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11. A lithium metal oxide powder for use as a cathode material in a rechargeable battery, having the general formula LiaNixCoyMzO2O2−
- eAf, wherein
0.9<
a<
1.1, 0.3≦
x≦
0.9, 0<
y≦
0.4, 0<
z≦
0.35, e<
0.02, 0<
f≦
0.05 and 0.9<
(x+y+z+f)<
1.1;wherein M comprises one or more elements selected from the group consisting of Al, Mg, and Ti; A comprises either one or both of S and C; wherein said powder has a particle size distribution defining a D10, D50 and D90; and said x and z parameters vary with the particle size of said powder; wherein either one or both of; x1−
x2≧
0.010 andz2−
z1≧
0.010;x1 and z1 being the parameters corresponding to particles having a particle size D90; and x2 and z2 being the parameters corresponding to particles having a particle size D10. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
- eAf, wherein
Specification