48results about How to "High discharge" patented technology

To provide a lithium-nickel-cobalt-manganese composite oxide powder for a positive electrode of a lithium secondary battery, which has a large volume capacity density and high safety and is excellent in the charge and discharge cyclic durability. A positive electrode active material powder for a lithium secondary battery characterized by comprising a first granular powder having a compression breaking strength of at least 50 MPa and a second granular powder having a compression breaking strength of less than 40 MPa, formed by agglomeration of many fine particles of a lithium composite oxide represented by the formula LipNixCoyMnzMqO2-aFa (wherein M is a transition metal element other than Ni, Co and Mn, Al or an alkaline earth metal element, 0.9≦p≦1.1, 0.2≦x≦0.8, 0≦y≦0.4, 0≦z≦0.5, y+z>0, 0≦q≦0.05, 1.9≦2−a≦2.1, x+y+z+q=1 and 0≦a≦0.02) to have an average particle size D50 of from 3 to 15 μm, in a weight ratio of the first granular powder / the second granular powder being from 50 / 50 to 90 / 10.

It is to provide a cathode active material powder for a positive electrode for a lithium secondary battery, which has a large volume capacity density, high safety and excellent durability for charge and discharge cycles. A cathode active material powder for a lithium secondary battery characterized by comprising a first composite oxide powder represented by the formula (1) LipQxMyOzFa (wherein Q is Co or Mn, M is aluminum or an alkaline earth metal element or a transition metal element other than Q, provided that when Q is Co, 0.9≦p≦1.1, 0.980≦x≦1.000, 0≦y≦0.02, 1.9≦z≦2.1, x+y=1, and 0≦a≦0.02, and when Q is Mn, 1≦p≦1.3, x=2−y, 0≦y≦0.05, z=4, and a=0), having an average particle size D50 of from 5 to 30 μm, and having a compression breaking strength of at least 40 MPa; and a second composite oxide powder represented by the formula (2) LipNixCoyMnzNqOrFa (wherein N is aluminum or an alkaline earth metal element or a transition metal element other than Ni, Co and Mn, 0.9≦p≦1.1, 0.2≦x≦0.8, 0≦y≦0.4, 0≦z≦0.5, 0≦q≦0.05, 1.9≦r≦2.1, x+y+z+q=1, and 0≦a≦0.02), having an average particle size D50 of from 2 to 30 μm, and having a compression breaking strength less than 40 MPa; in a ratio (weight ratio) of the first composite oxide powder / the second composite oxide powder being from 95 / 5 to 30 / 70.

A particulate positive electrode active material for a lithium secondary cell which satisfies high charge and discharge cyclic durability, high safety, high temperature storage properties, a high discharge average voltage, large current discharge properties, a high weight capacity density, a high volume capacity density, etc. in a well-balanced manner is provided. A particulate positive electrode active material for a lithium secondary cell, which is represented by the formula LipCoxMyOzFa (wherein M is at least one element selected from Groups 2 to 8, 13 and 14 of the Periodic Table, 0.9≦p≦1.1, 0.980≦x≦0.9999, 0.0001≦y≦0.02, 1.9≦z≦2.1, 0.9≦x+y≦1 and 0.0001≦a≦0.02), wherein fluorine atoms and element M are unevenly distributed on the particle surface, the atomic ratio of fluorine atoms to cobalt atoms (a / x) is from 0.0001 to 0.02, and in powder X-ray diffraction using CuKα-ray, the half value width of the angle of diffraction on (110) plane is from 0.06 to 0.13°, and the half value width of the angle of diffraction on (003) plane is from 0.05 to 0.12°.

A lithium-ion battery is provided that has a fast charge and discharge rate capability and low rate of capacity fade during high rate cycling. The battery can exhibit low impedance growth and other properties allowing for its use in hybrid electric vehicle applications and other applications where high power and long battery life are important features.