An impurity detection support device includes: a pipe in which a liquid under test flows; a first electrode and a second electrode provided in the pipe, the first electrode and the second electrode being arranged such that an AC voltage is adapted to be applied to or an AC current is adapted to be superimposed on the liquid under test in a space extending between a first position and a second position; a power supply unit that applies an AC voltage or superimposes an AC current between a pair of electrodes; a measurement unit that measures a current or a voltage generated between the pair of electrodes; and a calculation unit that calculates a resistance of the liquid under test using a measurement result of the measurement unit.

Provided is a lithium battery, wherein the battery comprises an anode, a cathode, wherein the cathode comprises one or more transition metals, an electrolyte, and a porous separator interposed between the cathode and anode, wherein the separator comprises an anionic compound. Also provided are methods of manufacturing such batteries.

Provided is a lithium battery, wherein the battery comprises an anode, a cathode, wherein the cathode comprises one or more transition metals, an electrolyte, and a porous separator interposed between the cathode and anode, wherein the separator comprises an anionic compound. Also provided are methods of manufacturing such batteries.

A carbon dioxide composite getter comprising a CO.sub.2-permeable envelope containing powders of two active materials and sealed systems employing the carbon dioxide composite getter.

A carbon dioxide composite getter comprising a CO.sub.2-permeable envelope containing powders of two active materials and sealed systems employing the carbon dioxide composite getter.

A method involves contacting a material for a lithium-based energy storage device with a supercritical substance maintained at or above its critical point. A lithium-based energy storage device is also provided, in which at least one of the various component parts (battery separator, lithium salt, negative electrode, negative current collector, positive electrode, and positive current collector) is substantially free of residual water by contact with the supercritical substance maintained at or above its critical point.

A method involves contacting a material for a lithium-based energy storage device with a supercritical substance maintained at or above its critical point. A lithium-based energy storage device is also provided, in which at least one of the various component parts (battery separator, lithium salt, negative electrode, negative current collector, positive electrode, and positive current collector) is substantially free of residual water by contact with the supercritical substance maintained at or above its critical point.

A battery includes a battery element, a housing body, and a valve device. The housing body houses the battery element. The valve device is in communication with the inside of the housing body. Heat-sealable resin layers face each other in a peripheral edge portion of the housing body. A joined edge portion in which the mutually facing heat-sealable resin layers are fused together is formed in the peripheral edge portion of the housing body. The valve device is configured to reduce an internal pressure of the housing body if the internal pressure is increased due to gas generated in the housing body. The valve device includes a first portion that is located on an outer side of an edge of the joined edge portion and a second portion that is sandwiched between the heat-sealable resin layers in the joined edge portion.

A battery includes a battery element, housing body, and valve device. The housing body has a laminate including a base material, barrier, and heat-sealable resin layers. The valve device is in communication with the housing body inside. A joined edge portion in which the mutually facing heat-sealable resin layers are fused together is formed in a housing body peripheral edge portion. The valve device includes first and second portions. A valve mechanism reduces the housing body internal pressure if it is increased due to gas generated in the housing body is formed in the first portion. An air passage guides gas generated in the housing body toward the valve mechanism is formed in the second portion. The first portion is located on a joined edge portion edge outer side. At least a portion of the second portion is sandwiched between the heat-sealable resin layers in the joined edge portion.

An exterior material for a power storage device, the exterior material being constituted by a laminated body that includes at least a base material layer, a barrier layer, and a heat-sealable resin layer in this order from the outer side. The heat-sealable resin layer is formed from a polybutylene terephthalate film. The exterior material has a water-absorbing layer on the inner side than the barrier layer, and that contains a water-absorbing agent.