A seal plate (2) seals an opening part of a capacitor case (an exterior case 52) and includes a main body part (4) including a through-hole (8) for discharging a gas (G) in the capacitor case, a pressure valve (12) arranged to cover the through-hole and including a valve body part (26) allowing passage of the gas, a storage part (16) formed in the through-hole to receive the valve body part expanded due to a pressure in the capacitor case, and a stopper (stopper wall 10) that includes an opening part (20) for discharging the gas passing through the valve body part and that comes into contact with a portion of the valve body part in the storage part to deform the valve body part. This achieves an increase in gas permeability of the pressure valve and a high operating pressure maintained in the pressure valve.

There is demand for a lithium ion capacitor positive electrode that can improve the battery characteristics (and, in particular, the rate characteristics) of a lithium ion capacitor. This lithium ion capacitor positive electrode is characterized by containing, in a positive electrode active material, at least one titanate selected from among Li.sub.2TiO.sub.3, Li.sub.4Ti.sub.5O.sub.12, Na.sub.2TiO.sub.3, and K.sub.2Ti.sub.2O.sub.5.

The application provides nanoporous separator membranes, HF-scavenging membranes, and moisture-absorbing membranes comprising aramid microfibers and aramid nanofibers. Also provided are rapid methods of preparing nanoporous separator membranes and moisture-absorbing membranes. Batteries, battery systems and visual indicators comprising a membrane of the application and are provided.

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 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 includes at least one laminate and an interior space wherein the battery element is housed, a first housing portion covers the interior space from a first side in a thickness direction, and a second housing portion that covers the interior space from a second side opposite to the first side in the thickness direction. The valve device attaches to the housing body and makes the interior space communicate with an external space. A joined edge portion is formed in the housing body by the first and second housing portion being fused along respective peripheral edges. The valve device is between the first and second housing portion in the joined edge portion, and an inner end of the valve device protrudes from an inner edge of the joined edge portion toward the interior space.

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.

A packaging material for a power storage device, comprising at least: a substrate layer; a metallic foil layer with an anti-corrosion treatment layer being disposed on one face or both faces thereof; and a sealant layer in this order, wherein a sealant layer includes a resin layer containing a polypropylene-based resin (A) and an incompatible component (B) incompatible with a polypropylene-based resin (A), and as for loss tangent tan δ obtained by dynamic viscoelasticity measurement at a frequency of 1.0 Hz, the sealant layer has a maximal value of tan δ at −30 to 30° C., and in addition, a ratio (II/I) of the maximal value (II) of tan δ at −30 to 30° C. to a value (I) of tan δ at −50° C. is 2.50 or more.

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.