The present disclosure provides an electrode piece and a battery. The electrode piece includes a current collector and a functional layer arranged on a first surface of the current collector, a tab is further arranged in middle of the first surface, and the functional layer on the first surface has a first slope area near the tab and a first normal area away from the tab, and a thickness of the first slope area gradually decreases along a direction towards the tab. The present disclosure can improve performances of the battery, such as rate capacity, safety and the like.

A system and method for optimizing electrochemical cells including electrodes employing coordination compounds by mediating water content within a desired water content profile that includes sufficient coordinated water and reduces non-coordinated water below a desired target and with electrochemical cells including a coordination compound electrochemically active in one or more electrodes, with an improvement in electrochemical cell manufacture that relaxes standards for water content of electrochemical cells having one or more electrodes including one or more such transition metal cyanide coordination compounds.

A system and method for optimizing electrochemical cells including electrodes employing coordination compounds by mediating water content within a desired water content profile that includes sufficient coordinated water and reduces non-coordinated water below a desired target and with electrochemical cells including a coordination compound electrochemically active in one or more electrodes, with an improvement in electrochemical cell manufacture that relaxes standards for water content of electrochemical cells having one or more electrodes including one or more such transition metal cyanide coordination compounds.

A composite cathode active material, a preparation method thereof, a cathode layer for an all-solid-state battery, and an all-solid-state battery including the cathode layer, the composite cathode active material for the all-solid-state battery including a secondary particle including a plurality of primary particles; and a buffer layer on a surface of the secondary particle, wherein the secondary particle includes a nickel lithium transition metal oxide represented by Formula 1, and the buffer layer includes a metal oxide represented by Formula 2,

Li.sub.aNi.sub.1-bM.sub.bO.sub.2  Formula 1

Li.sub.xA.sub.y-1E.sub.y2O.sub.z  Formula 2

Alkali metal secondary batteries that include anodes constructed from alkali metal foil applied to only one side of a porous current collector metal foil. Openings in the porous current collectors permit alkali metal accessibility on both sides of the anode structure. Such anode constructions enable the utilization of lower-cost and more commonly available alkali metal foil thickness, while still achieving high cell cycle life at a significantly reduced cost. Aspects of the present disclosure also include batteries with porous current collectors having increased volumetric and gravimetric energy densities, and methods of manufacturing anodes with porous current collectors.

Alkali metal secondary batteries that include anodes constructed from alkali metal foil applied to only one side of a porous current collector metal foil. Openings in the porous current collectors permit alkali metal accessibility on both sides of the anode structure. Such anode constructions enable the utilization of lower-cost and more commonly available alkali metal foil thickness, while still achieving high cell cycle life at a significantly reduced cost. Aspects of the present disclosure also include batteries with porous current collectors having increased volumetric and gravimetric energy densities, and methods of manufacturing anodes with porous current collectors.

A lithium ion conductor includes a compound of Formula 1:
Li.sub.7-a*α-(b-4)*β-xM.sup.a.sub.αLa.sub.3Zr.sub.2-βM.sup.b.sub.βO.sub.12-x-δX.sub.xN.sub.δ  Formula 1 wherein in Formula 1, M.sup.a is a cationic element having a valence of a, M.sup.b is a cationic element having a valence of b, and X is an anion having a valence of −1, wherein, when M.sup.a comprises H, 0≤α≤5, otherwise 0≤α≤0.75, and wherein 0≤β≤1.5, 0≤x≤1.5, (a*α+(b−4)β+x)>0, and 0<δ≤6.

Electrochemical cells comprising electrodes comprising lithium (e.g., in the form of a solid solution with non-lithium metals), from which in situ current collectors may be formed, are generally described.

In order to overcome the problem of metal dendrites caused by uneven deposition on the surface of the existing metal electrode, the present application provides a metal electrode, comprising a metal layer and a coating, the coating comprises at least one block copolymer; the block copolymer comprises a first polymer block for independently conducting metal ions and a second polymer block for providing mechanical strength; a shear modulus of the coating is ≥10.sup.7 Pa, and a thickness of the coating is 500 nm-50 μm. Meanwhile, the application also discloses a battery comprising the metal electrode. The metal electrode provided by the application has good ionic conductivity and inhibition capability for metal dendrite.

The present disclosure provides a cathode material including multiple composite secondary particles, each of the composite secondary particles including multiple primary cathode material particles, where the composite secondary particles meet: 0.9≤0.1D/A+B*C≤20 (Relation 1). In which A represents a particle size D50 of the primary cathode material particles, unit: μm; B represents a particle size D50 of the composite secondary particles, unit: μm; C represents a specific surface area of the composite secondary particles, unit: m.sup.2/g; and D represents a number of the primary cathode material particles in each of composite secondary particles.