摘要:
Lithium composite metal oxides prepared by mixing two or more hydroxides of different types of metal selected from the group of nickel, cobalt, manganese and aluminum and a lithium compound of which the D50 value is in the range 5 to 50 µm, the D90 value is 90 µm or smaller, and in which particles 100 µm or greater in particle size do not exist, followed by calcinating in the temperature range 700 to 1000°C and for 2 to 30 hours, and grinding, are used as the active materials of a positive electrode which is laminated with a negative electrode with a separator interposed and spirally wound thereby forming an electrode group. By using the positive active materials prepared in this manner, discharge capacity and cycle characteristic of a non-aqueous electrolyte secondary cell can be improved.
摘要:
This invention relates to complex lithium metal oxides, which are cathode active materials of a lithium or lithium ion secondary battery with enhanced cycle life and safety, and a process for preparation thereof. The core particles are complex lithium metal oxides capable of absorbing, storing and emitting lithium ions, and a coating layer comprised of amorphous complex lithium cobalt oxides that are formed on the surface of the core particle, which is structurally stable and inactive with electrolytes. Because the amorphous complex lithium cobalt oxides are inactive with electrolytes, the oxides stabilize the surface structure of the complex lithium metal oxide and improve on high temperature storage properties, as well as safety and cycle life.
摘要:
A cathode active material for a non-aqueous electrolyte secondary cell of the present invention, having a c-axis length of lattice constant of 14.080 to 14.160 Å, an average particle size of 0.1 to 5.0 µm, and a composition represented by the formula:
LiCo (1-x-y) Mn x Mg y O 2
wherein x is a number of 0.008 to 0.18; and y is a number of 0 to 0.18.
摘要:
An object of the present invention is to provide a positive active material for a nonaqueous electrolyte secondary battery which has a large discharge capacity and is superior in charge-discharge cycle performance, initial efficiency and high rate discharge performance, and a nonaqueous electrolyte secondary battery using the positive active material. The present invention pertains to a positive active material for a nonaqueous electrolyte secondary battery containing a lithium transition metal composite oxide which has a crystal structure of an ±-NaFeO 2 type, is represented by a compositional formula Li 1+± Me 1-± O 2 (Me is a transition metal element including Co, Ni and Mn, ± > 0), and has a molar ratio Li/Me of Li to the transition metal element Me of 1.2 to 1.6, wherein a molar ratio Co/Me of Co in the transition metal element Me is 0.02 to 0.23, a molar ratio Mn/Me of Mn in the transition metal element Me is 0.62 to 0.72, and the lithium transition metal composite oxide is observed as a single phase attributed to a space group R3-m on an X-ray diffraction chart when it is electrochemically oxidized up to a potential of 5.0 V (vs. Li/Li + ).
摘要:
An object of the present invention is to provide a positive active material for a nonaqueous electrolyte secondary battery which has a large discharge capacity and is superior in charge-discharge cycle performance, initial efficiency and high rate discharge performance, and a nonaqueous electrolyte secondary battery using the positive active material. The present invention pertains to a positive active material for a nonaqueous electrolyte secondary battery containing a lithium transition metal composite oxide which has a crystal structure of an α-NaFeO 2 type, is represented by a compositional formula Li 1+α Me 1-α O 2 (Me is a transition metal element including Co, Ni and Mn, α > 0), and has a molar ratio Li/Me of Li to the transition metal element Me of 1.2 to 1.6, wherein a molar ratio Co/Me of Co in the transition metal element Me is 0.02 to 0.23, a molar ratio Mn/Me of Mn in the transition metal element Me is 0.62 to 0.72, and the lithium transition metal composite oxide is observed as a single phase attributed to a space group R3-m on an X-ray diffraction chart when it is electrochemically oxidized up to a potential of 5.0 V (vs. Li/Li + ).
摘要:
Described is a composite lithium compound having a mixed crystalline structure. Such compound was formed by heating a lithium compound and a metal compound together. The resulting mixed metal crystal exhibits superior electrical property and is a better cathode material for lithium secondary batteries.
摘要:
Lithium composite metal oxides prepared by mixing two or more hydroxides of different types of metal selected from the group of nickel, cobalt, manganese and aluminum and a lithium compound of which the D50 value is in the range 5 to 50 µm, the D90 value is 90 µm or smaller, and in which particles 100 µm or greater in particle size do not exist, followed by calcinating in the temperature range 700 to 1000°C and for 2 to 30 hours, and grinding, are used as the active materials of a positive electrode which is laminated with a negative electrode with a separator interposed and spirally wound thereby forming an electrode group. By using the positive active materials prepared in this manner, discharge capacity and cycle characteristic of a non-aqueous electrolyte secondary cell can be improved.