Abstract: An electrochemical apparatus includes a positive electrode plate. The positive electrode plate includes a positive electrode material layer. The positive electrode material layer includes a fluorine-containing polymer and a cyano-containing polymer. A ratio b/a of a mole number b of nitrogen to a mole number a of fluorine in the positive electrode material layer satisfies 0.1?b/a?0.5. Adding the fluorine-containing polymer and the cyano-containing polymer in the positive electrode material layer and controlling the ratio b/a satisfies the above relationship enable a good bonding effect between particles in the positive electrode material layer. In addition, after cyano functional groups interact with transition metal ions of the positive electrode active material at full charge, oxidizing ability of transition metal ions is weakened, reducing side reactions between the positive electrode material layer and electrolyte, thereby improving high-temperature performance of the electrochemical apparatus.

Abstract: A secondary battery includes an electrode assembly and an electrolyte, where the electrode assembly includes a positive electrode plate, and a separator; the positive electrode plate includes a positive electrode active material layer; the positive electrode active material layer includes a positive electrode active material; the positive electrode active material includes a transition metal element; the transition metal element includes at least one of Co, Ni, Mn, Fe, or V; and the separator includes a base film, where a thickness of the base film is D ?m, and 3?D?7. The secondary battery includes an electrolyte nitrile-containing additive and a positive electrode nitrile-containing additive, where based on a mass of the electrolyte, a mass percentage of the electrolyte nitrile-containing additive is x %, and based on a mass of the positive electrode active material layer, a mass percentage of the positive electrode nitrile-containing additive is y %; where x+y=z, 0.3?z?3.3, 0?x?2.3, and 0<y?1.

Abstract: A secondary battery includes an electrode assembly, and the electrode assembly includes a positive electrode plate. The positive electrode plate includes a positive electrode active material layer. The positive electrode active material layer includes a positive electrode active material and a positive electrode additive. The positive electrode active material includes a transition metal element, the transition metal element including one or more selected from the group consisting of Co, Ni, Mn, Fe, and V. The positive electrode additive is a nitrile-containing organic compound, a carbon-to-nitrogen atom number ratio of the positive electrode additive is m, where 1?m?6; a weight-average molecular weight of the positive electrode additive is Mw, where 300?Mw?800000; and based on a mass of the positive electrode active material layer, a mass percentage of the positive electrode additive is x %, where 0.01?x?0.50.

Abstract: An electrochemical device includes a housing, an electrode assembly and an electrolytic solution, and the electrode assembly and the electrolytic solution are disposed in the housing. The electrode assembly includes electrode plates and a separator disposed between adjacent electrode plates. The separator includes a porous substrate and a first bonding layer disposed on a surface of the porous substrate. The first bonding layer includes a plurality of first bonding regions spaced apart from each other. A thickness direction of the electrode assembly is defined as a first direction. In the first direction, a circumscribed rectangle of a projection of the electrode assembly possesses a diagonal line and a first side. An angle between the diagonal line and the first side is ?1. An angle between a projection of each of the plurality of first bonding regions and the first side is ?2, where ?1/2??2?(?1/2+45°).

Abstract: An electrochemical apparatus, includes a packaging bag accommodating an electrode assembly and an electrolyte. The electrode assembly includes a positive electrode plate, a negative electrode plate, and a separator. The positive electrode plate includes a positive electrode current collector having an aluminum foil and element silicon. A mass percentage of the element silicon in the positive electrode current collector is 0.03%-0.13%. The positive electrode current collector includes: a first surface and a second surface opposite to each other; and a single-sided region having a first portion. The second surface in the first portion is located on an outer surface of the electrode assembly. A positive electrode active material layer is provided on the first surface and an inactive material layer is provided on the second surface respectively, in the single-sided region. The inactive material layer includes an inactive material including an inorganic oxide and/or an elemental nonmetal.

Abstract: An electrochemical apparatus includes a positive electrode plate. The positive electrode plate includes a positive electrode material layer. The positive electrode material layer includes a fluorine-containing polymer and a cyano-containing polymer. A ratio b/a of a mole number b of nitrogen to a mole number a of fluorine in the positive electrode material layer satisfies 0.1?b/a?0.5. Adding the fluorine-containing polymer and the cyano-containing polymer in the positive electrode material layer and controlling the ratio b/a satisfies the above relationship enable a good bonding effect between particles in the positive electrode material layer. In addition, after cyano functional groups interact with transition metal ions of the positive electrode active material at full charge, oxidizing ability of transition metal ions is weakened, reducing side reactions between the positive electrode material layer and electrolyte, thereby improving high-temperature performance of the electrochemical apparatus.

Abstract: An electrochemical device includes a housing, an electrode assembly and an electrolytic solution, and the electrode assembly and the electrolytic solution are disposed in the housing. The electrode assembly includes electrode plates and a separator disposed between adjacent electrode plates. The separator includes a porous substrate and a first bonding layer disposed on a surface of the porous substrate. The first bonding layer includes a plurality of first bonding regions spaced apart from each other. A thickness direction of the electrode assembly is defined as a first direction. In the first direction, a circumscribed rectangle of a projection of the electrode assembly possesses a diagonal line and a first side. An angle between the diagonal line and the first side is ?1. An angle between a projection of each of the plurality of first bonding regions and the first side is ?2, where ?1/2??2?(?1/2+45°).

Abstract: An electronic device includes an electrochemical device. The electrochemical device includes a negative electrode plate, and the negative electrode plate includes a negative current collector, a bonding layer, and a negative active material layer. The bonding layer is disposed between the negative current collector and the negative active material layer. The bonding layer includes a copolymer. Monomers that form the copolymer include at least a propylene monomer. The bonding layer is disposed between the negative current collector and the negative active material layer, the bonding layer includes a copolymer, and the monomers that form the copolymer include at least a propylene monomer, thereby improving the bonding between the negative current collector and the negative active material layer, enhancing interface stability of the corresponding electrochemical device during cycling, and improving cycle performance of the electrochemical device.

Abstract: An apparatus and a method for a trace oxygen sensor is configured with a floating cathode that has a capability to detect part-per-billion (ppb) level or less of oxygen in a gas background. An electrolyte reservoir can supply electrolyte when electrolyte level is low. An electrolyte reservoir may be connected to the main cell along with a protection electrode.

Abstract: An apparatus and a method for a trace oxygen sensor is configured with a floating cathode that has a capability to detect part-per-billion (ppb) level or less of oxygen in a gas background. An electrolyte reservoir can supply electrolyte when electrolyte level is low. An electrolyte reservoir may be connected to the main cell along with a protection electrode.

Abstract: A gas sensor includes an electrochemical cell. The electrochemical cell includes a body defining a cavity to contain a predetermined volume of electrolyte solution. The plurality of electrodes is disposed within the cavity and comprises an electrically conductive material that is substantially free of hazardous material. An energy module is coupled to the plurality of electrodes. The energy module provides a bias voltage suitable to reduce gas diffused in the electrolyte solution. An electrical interface is coupled to the energy module. The electrical interface has an electrical and mechanical form-factor to enable the gas sensor to replace a lead-based anode galvanic oxygen gas sensor as a drop-in replacement.

Abstract: According to one aspect of the present disclosure, a hydrogen sulfide tolerant oxygen gas sensing device comprises a gas sensing portion including a gas inlet, a sensing electrode adjacent the gas inlet, a counter electrode, and an electrolyte contacting the sensing electrode and the counter electrode. The gas sensing device also includes a filter portion including a porous hydrogen sulfide gas removal medium. The hydrogen sulfide filter portion is disposed adjacent the gas inlet of the gas sensing portion and defines a gas flow pathway to the gas inlet, through the porous hydrogen sulfide gas removal medium.