This application relates to a positive electrode plate and an electrochemical device. The positive electrode plate comprises a metal current collector, a positive electrode active material layer and a safety coating disposed between the metal current collector and the positive electrode active material layer; the safety coating comprises a polymer matrix, a conductive material and an inorganic filler; the positive electrode active material layer comprises Li.sub.1+xNi.sub.aCo.sub.bMe.sub.(1−a−b)O.sub.2, wherein −0.1≤x≤0.2, 0.6≤a<1, 0<b<1, 0<(1−a−b)<1, and Me is at least one of Mn, Al, Mg, Zn, Ga, Ba, Fe, Cr, Sn, V, Sc, Ti and Zr; and the metal current collector is a porous aluminum-containing current collector. The positive electrode plate can improve safety and electrical performances of an electrochemical device (such as a capacitor, a primary battery, or a secondary battery).

Some aspects of the disclosure are related to lithium batteries, and more specifically, to integrated battery electrode and separator. In some embodiments, an electrochemical cell comprises a single integrated unit comprising insulating layer, current collectors, electroactive material layers, separators, and the like. Methods of manufacturing of the integrated battery unit are disclosed herein. Some embodiments of the disclosure are also directed to an integrated anode-free electrochemical cell that lacks an anode or anode electroactive material layer. In some such embodiments, methods directed to electrical storage and use of such an anode-free electrochemical cell are disclosed herein.

A battery comprises a housing, an electrolyte disposed in the housing, a cathode disposed in the housing, an anode disposed in the housing and comprising an anode material comprising: zinc or zinc oxide, an electrocoagulant material selected from the group consisting of: aluminum, iron, titanium, calcium, zirconium, a hydroxide thereof, a salt thereof, an oxide thereof, and a combination thereof, and a binder.

An object of one embodiment of the present invention is to provide a secondary battery in which deterioration of charge-discharge cycle characteristics is suppressed, to suppress generation of defects caused by expansion and contraction of an active material in a negative electrode, or to prevent deterioration caused by deformation of a secondary battery. To prevent deterioration, a material that can be alloyed with lithium and fluidified easily is used for a negative electrode. To hold a negative electrode active material over a surface of a current collector, a covering layer that covers the negative electrode active material is provided. Furthermore, a portion where the current collector and the negative electrode active material are in contact with each other is alloyed. In other words, an alloy that is in contact with both the current collector and the negative electrode active material is provided in the negative electrode.

A main object of the present disclosure is to provide an all solid state battery wherein interface resistance between a current collector and an active material layer is low. In the present disclosure, the above object is achieved by providing an all solid state battery comprising: an electrode including a current collector, an electron conductive layer, and an active material layer, in this order, and a solid electrolyte layer formed on the active material layer side of the electrode, and the electron conductive layer is an agglutinate of metal particles or a metal foil, and electron conductivity of the electron conductive layer is 1×10.sup.3 S/cm or more at 25° C.

An electrically conductive hybrid membrane, including a solid membrane substrate including a curable material; and electrically conductive particle disposed on the solid membrane substrate, wherein the solid membrane substrate has an elastic modulus of about 10 MPa to about 1000 MPa, and the electrically conductive particle is exposed on both sides of the solid membrane substrate.

A negative electrode for a nonaqueous electrolyte secondary battery includes a negative electrode mixture including a negative electrode active material capable of electrochemically storing and releasing lithium ions, a carbon nanotube, and an acrylic resin, wherein the negative electrode active material includes a silicon-containing material, and the carbon nanotube has an average diameter of 5 nm or less.

A silicon-based negative electrode material and a method for preparing the same, a battery including the silicon-based negative electrode material, and a terminal are provided. The silicon-based negative electrode material includes a silicon-based matrix with a low silicon-oxygen ratio and silicon-based particles with a high silicon-oxygen ratio dispersed in the silicon-based matrix with the low silicon-oxygen ratio. A silicon-oxygen ratio of the silicon-based matrix with the low silicon-oxygen ratio is 1:x, and 1<x≤2. A silicon-oxygen ratio of the silicon-based particles with the high silicon-oxygen ratio is 1:y, and 0≤y≤1. The silicon-based matrix with the low silicon-oxygen ratio is silicon dioxide, or the silicon-based matrix with the low silicon-oxygen ratio includes silicon dioxide and silicon-containing crystal particles dispersed in the silicon dioxide.

The present invention relates to a composition for the production of a graphite powder, suitable for making high performance lithium-ion battery anodes and other applications. The composition of matter comprises a biochar, a metal and graphite. The biochar is typically derived from the pyrolysis of woody biomass. The metal is typically a transition metal derived from the decomposition and reduction of an organic or inorganic metallic compound. The graphite is highly crystalline and has a wide range of morphologies or structures.

Alkaline electrochemical cells are provided, containing cathodes with a nickel compound active material, wherein active material particles are coated with at least one of a number of materials so as to improve the shelf life of the electrochemical cell. Methods of preparing such cathodes and electrochemical cells are also provided.