A non-aqueous electrolyte secondary battery positive electrode capable of suppressing a decomposition reaction of an electrolyte solution in an overcharged state is provided. A non-aqueous electrolyte secondary battery positive electrode according to this embodiment includes a positive electrode active material layer which includes a positive electrode active material (54) containing a lithium transition metal oxide, a tungsten compound (56), a phosphoric acid compound (58) not in contact with the positive electrode active material (54), and an electrically conductive agent (52) in contact with the tungsten compound (56) and the phosphoric acid compound (58).

A lithium-metal or lithium-ion battery includes a stack of a cathode layer made of LiCoO.sub.2, an anode layer and an electrolyte layer made of LiPON positioned between anode and cathode layers. An encapsulating layer covers the stack. The battery further includes an interface layer made of a material that is able to capture oxygen generated during charge/discharge cycles of the battery. This interface layer is placed under the encapsulating layer.

Disclosed are a method of manufacturing a secondary battery having an electrode assembly sealed therein including: (a) sealing a battery case after introducing an electrode assembly having a structure, in which a separator is interposed between a positive electrode and a negative electrode, and an electrolyte thereinto; and (b) removing gases generated at an abnormal operation state of a battery or high temperature from an internal battery environment by pressing both sides of the battery case having the electrode assembly embedded therein in the sealing (a) to increase internal pressure of the battery case in the sealing, wherein the electrode assembly includes a spinel-structure lithium nickel manganese composite oxide as a positive electrode active material and a lithium metal oxide as a negative electrode active material.

In an aspect, provided is an alkaline rechargeable battery comprising: i) a battery container sealed against the release of gas up to at least a threshold gas pressure, ii) a volume of an aqueous alkaline electrolyte at least partially filling the container to an electrolyte level; iii) a positive electrode containing positive active material and at least partially submerged in the electrolyte; iv) an iron negative electrode at least partially submerged in the electrolyte, the iron negative electrode comprising iron active material; v) a separator at least partially submerged in the electrolyte provided between the positive electrode and the negative electrode; vi) an auxiliary oxygen gas recombination electrode electrically connected to the iron negative electrode by a first electronic component, ionically connected to the electrolyte by a first ionic pathway, and exposed to a gas headspace above the electrolyte level by a first gas pathway.

A non-aqueous electrolyte secondary battery positive electrode capable of suppressing a decomposition reaction of an electrolyte solution in an overcharged state is provided. A non-aqueous electrolyte secondary battery positive electrode according to this embodiment includes a positive electrode active material layer which includes a positive electrode active material (54) containing a lithium transition metal oxide, a tungsten compound (56), a phosphoric acid compound (58) not in contact with the positive electrode active material (54), and an electrically conductive agent (52) in contact with the tungsten compound (56) and the phosphoric acid compound (58).

In an aspect, provided is an alkaline rechargeable battery comprising: i) a battery container sealed against the release of gas up to at least a threshold gas pressure, ii) a volume of an aqueous alkaline electrolyte at least partially filling the container to au electrolyte level; iii) a positive electrode containing positive active material and at least partially submerged in the electrolyte, iv) an iron negative electrode at least partially submerged in the electrolyte, the iron negative electrode comprising iron active material; v) a separator at least partially submerged in the electrolyte provided between the positive electrode and the negative electrode; vi) an auxiliary oxygen gas recombination electrode electrically connected to the iron negative electrode by a first electronic component, ionically connected to the electrolyte by a first some pathway, and exposed to a gas headspace above the electrolyte level by a first gas pathway.

In an aspect, provided is an alkaline rechargeable battery comprising: i) a battery container sealed against the release of gas up to at least a threshold gas pressure, ii) a volume of an aqueous alkaline electrolyte at least partially filling the container to au electrolyte level; iii) a positive electrode containing positive active material and at least partially submerged in the electrolyte, iv) an iron negative electrode at least partially submerged in the electrolyte, the iron negative electrode comprising iron active material; v) a separator at least partially submerged in the electrolyte provided between the positive electrode and the negative electrode; vi) an auxiliary oxygen gas recombination electrode electrically connected to the iron negative electrode by a first electronic component, ionically connected to the electrolyte by a first some pathway, and exposed to a gas headspace above the electrolyte level by a first gas pathway.

A sodium metal battery cell and a preparation method thereof, a battery, and an electrical device. The sodium metal battery cell includes: an electrolyte solution, where the electrolyte solution includes a first additive, and the first additive includes an organic compound containing an unsaturated group; and a catalyst, where the catalyst includes at least one of a transition-metal pure element or an alloy thereof.

This disclosure relates to systems and methods for gas mitigation. In one aspect of the disclosure, a battery is presented. The battery has a de-gassed lithium-manganese rich battery cell and a lithium-based anode packaged with a lithium-manganese-rich cathode, saturated in an electrolyte. A barium oxide-based coating is in the de-gassed lithium-manganese rich battery cell, and configured to convert oxygen and carbon dioxide into barium peroxide and carbonate and retain the barium peroxide and carbonate.