摘要:
The present invention includes a method of preparing secondary lithium and lithium-ion batteries with improved coulombic efficiency, improved cycling and storage performance at elevated temperatures, and lower rates of transition metal dissolution. In accordance with the present invention, the positive electrode material is thermally treated at a temperature of between 50° C. and 120° C. to produce a passivating film having lithium ion conductivity. The present invention also includes a secondary lithium or lithium-ion cell having positive electrode material covered with a thermally-activated thin passivating film having lithium ion conductivity and a positive electrode material formed of particles of a lithium intercalation compound with a passivating film on the surface of the particles.
摘要:
The present invention includes lithium manganese oxide spinel compounds having a low porosity, a high tap density and a high pellet density, and methods of preparing these compounds. In particular, the method comprises preparing a lithium manganese oxide with a spinel structure and having the formula: wherein: Li 1 + X Mn 2 - Y M m 1 1 M m 2 2 … M m k k O 4 + Z M1, M2, . . . Mk are cations different than lithium or manganese selected from the group consisting of alkaline earth metals, transition metals, B, Al, Si, Ga and Ge; X, Y, m1, m2, . . . mk, each have a value between 0 and 0.2; Z has a value between −0.1 and 0.2; and X, Y, m1, M2. . . mk are selected to satisfy the equation: Y=X+m1+m2+. . . +mk.
摘要:
The present invention includes lithium manganese oxide spinel compounds having a low porosity, a high tap density and a high pellet density, and methods of preparing these compounds. In particular, the method comprises preparing a lithium manganese oxide with a spinel structure and having the formula: wherein: Li1+XMn2−YMm11Mm22 . . . MmkkO4+Z M1, M2, . . . Mk are cations different than lithium or manganese selected from the group consisting of alkaline earth metals, transition metals, B, Al, Si, Ga and Ge; X, Y, m1, m2, . . . , mk, each have a value between 0 and 0.2; Z has a value between −0.1 and 0.2; and X, Y, m1, m2, . . . mk are selected to satisfy the equation: Y=X+m1+m2+ . . . +mk.
摘要:
The present invention includes lithium manganese oxide spinel compounds having a low porosity, a high tap density and a high pellet density, and methods of preparing these compounds. In particular, the method comprises preparing a lithium manganese oxide with a spinel structure and having the formula: wherein: Li1+XMn2−YM1m1M2m2 . . . MkmkO4+Z M1, M2, . . . Mk are cations different than lithium or manganese selected from the group consisting of alkaline earth metals, transition metals, B, Al, Si, Ga and Ge; X, Y, m1, m2, . . . , mk, each have a value between 0 and 0.2; Z has a value between −0.1 and 0.2; and X, Y, m1, m2, . . . mk are selected to satisfy the equation: Y=X+m1+m2+ . . . +mk.
摘要:
The present invention provides a positive electrode material for lithium and lithium-ion secondary cells which exhibits good cycleability, reversible specific capacity, and structural stability. The positive electrode material comprises a lithium multi metal oxide having a spinel structure and described by the general formula:Li.sub.1+X Mn.sub.2-Y M.sub.m.sbsb.1.sup.1 M.sub.m.sbsb.2.sup.2 . . . M.sub.m.sbsb.k.sup.k O.sub.4+Zwherein M.sup.1, M.sup.2, . . . M.sup.k are at least two cations different than lithium or manganese, selected from the group consisting of alkaline earth metals, transition metals, B, Al, Si, Ga and Ge;X, Y, m.sub.1,m.sub.2, . . . m.sub.k are numbers between 0 and 0.2;m.sub.1, m.sub.2 and Y are greater than 0;Z is a number between -0.1 and 0.2; andwherein the metals M.sup.1, M.sup.2, . . . M.sup.k and the corresponding values m.sub.1, m.sub.2, . . . m.sub.k satisfy the following equation and inequality: ##EQU1## wherein V.sub.1, V.sub.2, . . . V.sub.k are the corresponding valence states of the cations M.sup.1, M.sup.2, . . . M.sup.k.
摘要:
A novel method of preparing a spinel Li.sub.1+X Mn.sub.2-X O.sub.4+Y intercalation compound with low lattice distortion and a highly ordered and homogeneous structure for 4 V secondary lithium and lithium ion cells is provided. The method of preparing the spinel Li.sub.1+X Mn.sub.2-X O.sub.4+Y intercalation compound comprises providing a spinel Li.sub.1+X Mn.sub.2-X O.sub.4 intercalation compound having a lithium to manganese mole ratio of between about 1.02:2 and 1.1:2 and firing the spinel at different temperature ranges with corresponding gas flow rates to form the spinel Li.sub.1+X Mn.sub.2-X O.sub.4+Y intercalation compounds. The spinel Li.sub.1+X Mn.sub.2-X O.sub.4+Y intercalation compounds have a mean X value of between about 0.01 and 0.05, a mean Y value of between about -0.02 and 0.04 and a full width at half maximum of the x-ray diffraction peaks at a diffraction angle 2.theta. of planes (400) and (440) using CuK.alpha..sub.1 rays of between about 0.08.degree. and 0.13.degree.. The spinel Li.sub.1+X Mn.sub.2-X O.sub.4+Y intercalation compounds may be used in the positive electrodes of secondary lithium and lithium ion cells to provide cells having high specific capacities and long cycling lives.
摘要:
A novel method of preparing a spinel Li.sub.1+X Mn.sub.2-X O.sub.4 intercalation compound with low lattice distortion and a highly ordered and homogeneous structure for 4 V secondary lithium and lithium ion cells is provided. The method of preparing the spinel Li.sub.1+X Mn.sub.2-X O.sub.4 intercalation compound comprises mixing at least one manganese compound with at least one lithium compound and firing the mixture at three different temperature ranges with corresponding gas flow rates to form the spinel Li.sub.1+X Mn.sub.2-X O.sub.4 intercalation compounds. The spinel Li.sub.1+X Mn.sub.2-X O.sub.4 intercalation compounds have a mean X value of between about 0.01 and 0.05 and a full width at half maximum of the x-ray diffraction peaks at a diffraction angle 2.theta. of planes (400) and (440) using CuK.alpha..sub.1 rays of between about 0.10.degree. and 0.15.degree.. The spinel Li.sub.1+X Mn.sub.2-X O.sub.4 intercalation compounds may be used in the positive electrodes of secondary lithium and lithium ion cells to provide cells having high specific capacities and long cycling lives.
摘要:
A novel method of preparing a spinel Li.sub.1+x Mn.sub.2-x O.sub.4 intercalation compound with low lattice distortion and a highly ordered and homogeneous structure for 4 V secondary lithium and lithium ion cells is provided. The method of preparing the spinel Li.sub.1+x Mn.sub.2-x O.sub.4 intercalation compound comprises mixing at least one manganese compound with at least one lithium compound and firing the mixture at three different temperature ranges with corresponding gas flow rates to form the spinel Li.sub.1+x Mn.sub.2-x O.sub.4 intercalation compounds. The spinel Li.sub.1+x Mn.sub.2-x O.sub.4 intercalation compounds have a mean X value of between about 0.01 and 0.05 and a full width at half maximum of the x-ray diffraction peaks at a diffraction angle 2.theta. of planes (400) and (440) using CuK.alpha..sub.1 rays of between about 0.10.degree. and 0.15.degree.. The spinel Li.sub.1+x Mn.sub.2-x O.sub.4 intercalation compounds may be used in the positive electrodes of secondary lithium and lithium ion cells to provide cells having high specific capacities and long cycling lives.
摘要:
A novel method of preparing a spinel Li.sub.1+X Mn.sub.2-X O.sub.4+Y intercalation compound with low lattice distortion and a highly ordered and homogeneous structure for 4 V secondary lithium and lithium ion cells is provided. The method of preparing the spinel Li.sub.1+X Mn.sub.2-X O.sub.4+Y intercalation compound comprises providing a spinel Li.sub.1+X Mn.sub.2-X O.sub.4 intercalation compound having a lithium to manganese mole ratio of between about 1.02:2 and 1.1:2 and firing the spinel at different temperature ranges with corresponding gas flow rates to form the spinel Li.sub.1+X Mn.sub.2-X O.sub.4+Y intercalation compounds. The spinel Li.sub.1+X Mn.sub.2-X O.sub.4+Y intercalation compounds have a mean X value of between about 0.01 and 0.05, a mean Y value of between about -0.02 and 0.04 and a full width at half maximum of the x-ray diffraction peaks at a diffraction angle 2.theta. of planes (400) and (440) using CuK.alpha..sub.1 rays of between about 0.08.degree. and 0.13.degree.. The spinel Li.sub.1+X Mn.sub.2-X O.sub.4+Y intercalation compounds may be used in the positive electrodes of secondary lithium and lithium ion cells to provide cells having high specific capacities and long cycling lives.
摘要:
A lithium polymer battery or multi-cell and a method of making the multi-cells. The multi-cell comprises a plurality of laminated single cell units, each unit comprising, laminated in sequence, a negative electrode current collector, a negative electrode, a first electrolyte-impregnated separator, a positive electrode, and a positive electrode current collector. These single cell units are stacked one next to another in sequence and a second electrolyte-impregnated separator is positioned between adjacent laminated cell units. The method includes positioning, in sequence, a negative electrode current collector, a negative electrode, a first porous separator, a positive electrode, and a positive electrode current collector to form a single cell unit. A plurality of the single cell units are then positioned adjacent one another in sequence, and a second porous separator is positioned between adjacent single cell units. The method further includes impregnating each of the first and second porous separators with an electrolyte and laminating each single cell unit, but adjacent cell units are not laminated to one another.