Positive electrode for lithium-ion electrochemical cell
AssigneeSaft
InventorsLucille GAL, Jérémy HUMEZ
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Abstract
An electrode comprising a mixture of active materials, which mixture comprises: —a lithium nickel manganese oxide of formula LiaNi1-x-y-zMnxCoyMzO2 where 0.9≤a≤1.1; 0.60≤1-x-y-z<0.80; 0<x; 0≤y≤0.02; 0≤z; M being one or more elements chosen from the group consisting of Al, B, Mg, Si, Ca, Ti, V, Cr, Fe, Cu, Zn, Y, Zr, Nb, W, Mo, S, Sr, Ce, Ga, Ta, Nd, Pr, and La; and—a lithium manganese iron phosphate of formula LixMn1-y-zFeyMzPO4 where 0.8≤x≤1.2; 0.5≤1-y-z<1; 0<y≤0.5; 0≤z≤0.2; M is one or more elements chosen from the group consisting of Al, B, Mg, Si, Ca, Ti, V, Cr, Co, Cu, Ni, Zn, Y, Zr, Nb, W and Mo.
Claims14
An electrode comprising a mixture of active materials, which mixture comprises:
- a monocrystalline lithium nickel manganese oxide of the formula LiaNi1-x-y-zMnxCoyMzO2 where 0.9≤a≤1.1;
- 0.60≤1-x-y-z<0.80;
- 0<x;
- 0≤y≤0.02;
- 0≤z;
- M being one or more elements chosen from the group consisting of Al, B, Mg, Si, Ca, Ti, V, Cr, Fe, Cu, Zn, Y, Zr, Nb, W, Mo, S, Sr, Ce, Ga, Ta, Nd, Pr, and La;
- and
- a lithium manganese iron phosphate of the formula LixMn1-y-zFeyMzPO4 where 0.8≤x≤1.2;
- 0.5≤1-y-z<1;
- 0<y≤0.5;
- 0≤z≤0.2;
- M being one or more elements chosen from the group consisting of Al, B, Mg, Si, Ca, Ti, V, Cr, Co, Cu, Ni, Zn, Y, Zr, Nb, W and Mo.
A method for improving the detection of the end of charge of a lithium-ion electrochemical cell comprising a positive electrode comprising a lithium manganese iron phosphate of the formula LixMn1-y-zFeyMzPO4 where 0.8≤x≤1.2;
- 0.5≤1-y-z<1;
- 0<y≤0.5;
- 0≤z≤0.2;
- M being one or more elements chosen from the group consisting of Al, B, Mg, Si, Ca, Ti, V, Cr, Co, Cu, Ni, Zn, Y, Zr, Nb, W and Mo, said method comprising:
- a) replacing during the manufacture of a positive electrode of a portion of lithium manganese iron phosphate by a monocrystalline lithium nickel manganese oxide of formula
- LiaNi1-x-y-zMnxCoyMzO2 where 0.9≤a≤1.1;
- 0.60≤1-x-y-z<0.80;
- 0<x;
- 0≤y≤0.02;
- 0≤z;
- M being one or more elements chosen from the group consisting of Al, B, Mg, Si, Ca, Ti, V, Cr, Fe, Cu, Zn, Y, Zr, Nb, W, Mo, S, Sr, Ce, Ga, Ta, Nd, Pr, and La;
- b) correlating the voltage of the cell with its state of charge.
Dependencies are inferred from the claim text.