LITHIUM SECONDARY BATTERY
First Claim
Patent Images
1. A lithium secondary battery, comprising:
- a cathode formed from a cathode active material including a first cathode active material particle and a second cathode active material particle;
an anode; and
a separator interposed between the cathode and the anode,wherein the first cathode active material particle includes a lithium metal oxide including a concentration gradient region between a central portion and a surface,wherein the second cathode active material particle includes a lithium metal oxide having a single particle structure, and is represented by Chemical Formula 1;
LixM1′
aM2′
bM3′
cOy
[Chemical Formula 1]wherein, in Chemical Formula 1, M1′
, M2′ and
M3′
are selected from Ni, Co, Mn, Na, Mg, Ca, Ti, V, Cr, Cu, Zn, Ge, Sr, Ag, Ba, Zr, Nb, Mo, Al, Ga, W or B, and 0<
x≤
1.1, 2≤
y≤
2.02, 0.7≤
a≤
0.9, 0.1≤
b+c≤
0.3 and a+b+c=1.
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Abstract
A lithium secondary battery comprises a cathode active material including a first cathode active material particle having a concentration gradient region and a second cathode active material particle having a single particle structure, to obtain improved electrical performance and mechanical stability.
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Citations
13 Claims
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1. A lithium secondary battery, comprising:
-
a cathode formed from a cathode active material including a first cathode active material particle and a second cathode active material particle; an anode; and a separator interposed between the cathode and the anode, wherein the first cathode active material particle includes a lithium metal oxide including a concentration gradient region between a central portion and a surface, wherein the second cathode active material particle includes a lithium metal oxide having a single particle structure, and is represented by Chemical Formula 1;
LixM1′
aM2′
bM3′
cOy
[Chemical Formula 1]wherein, in Chemical Formula 1, M1′
, M2′ and
M3′
are selected from Ni, Co, Mn, Na, Mg, Ca, Ti, V, Cr, Cu, Zn, Ge, Sr, Ag, Ba, Zr, Nb, Mo, Al, Ga, W or B, and 0<
x≤
1.1, 2≤
y≤
2.02, 0.7≤
a≤
0.9, 0.1≤
b+c≤
0.3 and a+b+c=1. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification