Abstract:
The electrode material for a lithium secondary battery according to the present invention includes particles of a solid state alloy having silicon as a main component, wherein the particles of the solid state alloy have a microcrystal or amorphous material including an element other than silicon, dispersed in microcrystalline silicon or amorphized silicon. The solid state alloy preferably contains a pure metal or a solid solution. The composition of the alloy preferably has an element composition in which the alloy is completely mixed in a melted liquid state, whereby the alloy has a single phase in a melted liquid state without pressure of two or more phases. The element composition can be determined by the kind of elements constituting the alloy and an atomic ratio of the elements.
Abstract:
A secondary battery exhibiting a long cycle life and comprising a negative pole activating material made of lithium or zinc is provided, the battery at least having a negative pole made of lithium or zinc serving as the negative pole activating material, an electrolyte (electrolytic solution), a separator, a positive pole made of a positive pole activating material, a collecting electrode and a battery case, wherein at least the surface of the negative pole is covered with a film having a structure which allows ions relating to the battery reactions to pass through. Since growth of dendrite of lithium or zinc at the time of the charge can be prevented, short circuit between the negative pole and the positive pole can be prevented. Therefore, the charge/discharge cycle life can significantly be lengthened. As a result, a lithium secondary battery, a nickel-zinc secondary battery, an air-zinc secondary battery, a bromine-zinc secondary battery and a silver oxide-zinc secondary battery of the long cycle life can be manufactured.
Abstract:
An electrode material for a negative pole of a lithium secondary battery containing particles which comprises an amorphous Sn.A.X alloy having a substantially non-stoichiometric composition, wherein A represents at least one element selected from the transition metal elements, X is an optional component and represents at least one element selected from the group consiting of O, F, N, Mg, Ba, Sr, Ca, La, Ce, Si, Ge, C, P, B, Bi, Sb, Al, In, and Zn, and the content of the component Sn [Sn/(Sn+A+X)] is 20 to 80 atomic %. An electrode structure for a lithium secondary cell composed of the aforementioned electrode material for a negative electrode and a collector comprising a material which forms no alloy with lithium in an electrochemical reaction, and a lithium secondary cel having a negative pole comprising the electrode structure.
Abstract:
An electrode material for a negative pole of a lithium secondary battery containing particles which comprises and amorphous M•A•X alloy having a substantially non-stoichiometric composition, wherein M represents at least one element selected from the group consisting of Si, Ge, and Mg, A represents at least one element selected from the transition metal elements, X is an optional component and represents at least one element selected from the group consisting of O, F, N, Ba, Sr, Ca, La, Ce, C, P, S, Se, Te, B, Bi, Sb, Al, In, and Zn, and the content of the component M [M/(M+A+X)] is 20 to 80 atomic %. An electrode structure for a lithium secondary cell composed of the aforementioned electrode material for a negative electrode and a collector comprising a material which forms no alloy with lithium in an electrochemical reaction. A lithium secondary cell having a negative pole comprising the electrode structure.
Abstract:
A method of producing a material capable of electrochemically storing and releasing a large amount of lithium ions is provided. The material is used as an electrode material for a negative electrode, and includes silicon or tin primary particles composed of crystal particles each having a specific diameter and an amorphous surface layer formed of at least a metal oxide, having a specific thickness. Gibbs free energy when the metal oxide is produced by oxidation of a metal is smaller than Gibbs free energy when silicon or tin is oxidized, and the metal oxide has higher thermodynamic stability than silicon oxide or tin oxide. The method of producing the electrode material includes reacting silicon or tin with a metal oxide, reacting a silicon oxide or a tin oxide with a metal, or reacting a silicon compound or a tin compound with a metal compound to react with each other.
Abstract:
A purpose of the present invention is to provide a secondary battery of high safety and high energy density. The battery of the present invention is a microcapsule containing lithium secondary battery at least formed of negative electrode active material, a separator, positive electrode active material, electrolytic solution (electrolyte), a collector and a battery case, characterized in that microcapsules are dispersed within the electrolytic solution or separator, said microcapsules discharging the chemical substance having hydroxyl group or chemical substance which is polymerization initiator, when the temperature within battery rises.
Abstract:
A detecting method for detecting internal information of an inspective rechargeable battery when said inspective rechargeable battery is charged by a constant current-constant voltage charging regime, comprising at least a step (A) of measuring an elapse of time (t) from the time when a constant current charging mode at a constant current value I0 is shifted to a constant voltage charging mode at a constant voltage Vmax and measuring a charge current value I in the constant voltage charging mode, a step (B) of obtaining a period of time from said shift time to the constant voltage charging in the constant voltage charging mode until the time when said charge current value I0 in the constant voltage charging mode reaches a given current value IM, and a step (C) of obtaining an electricity quantity charged in the constant voltage charging mode with respect to the inspective rechargeable battery.