136results about How to "Reduce discharge capacity" patented technology

The purpose of the present invention is to provide a lithium transition metal silicate type positive electrode active material which has excellent cycle properties and undergoes the decrease in discharge capacity to a reduced extent even when charge and discharge are performed repeatedly. The present invention provides a positive electrode active material characterized by comprising a lithium transition metal silicate which is represented by the general formula Li2-yFe1-xMxSi1-yXyO4 (wherein M represents at least one transition metal selected from the group consisting of Mn, Ti, Cr, V, Ni, Co, Cu, Zn, Al, Ge, Zr, Mo and W; X represents at least one element selected from the group consisting of Ti, Cr, V, Zr, Mo, W, P and B; 0 <= x <= 1; and 0 <= y<=0.25), and which has a mixed phase composed of an orthorhombic structure having a symmetric Pmn21 space group and a monoclinic structure having a symmetric P21 / n space group.

Low temperature discharge capability and high rate discharge capability are improved in an alkaline storage battery that uses as its negative electrode a hydrogen-absorbing alloy electrode employing hydrogen-absorbing alloy particles containing at least nickel and a rare-earth element. An alkaline storage battery uses as the negative electrode a hydrogen-absorbing alloy electrode employing hydrogen-absorbing alloy particles containing at least nickel and a rare-earth element. The hydrogen-absorbing alloy particles have a surface layer and an interior portion, the surface layer having a nickel content greater than that of the interior portion, and nickel particles having a particle size within a range of from 10 nm to 50 nm are present in the surface layer.

Disclosed is an Si-based-alloy anode material for a lithium ion secondary battery. The Si-based-alloy anode material comprises an alloy phase configured from an Si primary phase comprising Si, and a compound phase comprising at least two elements. The at least two elements include: at least one first added element (A) selected from the group consisting of Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zr, Nb, and Mg; and at least one low-melting-point second added element (B) selected from the group consisting of S, Se, Te, Sn, In, Ga, Pb, Bi, Zn, Al, and Ag. The compound phase: (i) contains a first compound phase comprising Si and a first added element (A), a second compound phase comprising a first added element (A) and a second added element (B), and a single phase of a second added element (B) and / or a third compound phase comprising at least two second added elements (B); or (ii) a compound phase comprising Si and a first added element (A), and a single phase of a second added element (B) and / or a compound phase comprising at least two second added elements (B). The average minor axis width of the Si primary phase is no greater than 4 [mu]m. By means of the anode material, it is possible to provide a secondary battery having favorable charging / discharging capacity and cycle life.

A battery capable of ensuring storage characteristics and overcharge characteristics is provided. The battery comprising a cathode, an anode, and an electrolytic solution. The cathode has a cathode current collector and a cathode active material layer provided on the cathode current collector. The cathode active material layer includes an aromatic compound having three or more benzene rings. The electrolytic solution includes at least one of an ester carbonate containing a halogen and an ester carbonate containing an unsaturated bond.

Disclosed is a negative electrode active material which has a high capacity and good cycle properties. The negative electrode active material comprises nanosized carbon particles and nanosized tin dioxide particles that are carried on the nanosized carbon particles in a high-dispersion state. This negative electrode active material has a high discharge capacity because of the reversible progress of a conversion reaction of tin dioxide (SnO2+4Li++4e-?2Li2O+Sn) therein. In a charge-discharge cycle test within a voltage range of 0-2 V vs. an Li / Li+ electrode, the aforesaid negative electrode active material shows a discharge capacity retention ratio of about 90% even after repeating the charge-discharge cycles 500 times under rate 1C conditions, which indicates very good cycle properties. Thus, the aforesaid negative electrode active material can be appropriately used in a lithium ion secondary battery and a hybrid capacitor.