The present invention provides a silicon-carbon composite which contains a body having a core-shell structure and a polymer modification layer. The core of the body contains a silicon-containing particle. The shell of the body is a carbon encapsulation layer. The polymer modification layer is located on the external surface of the shell of the body and encapsulates the body. The polymer modification layer comprises a polymer selected from the group consisting of polyester, polyfluorocarbon, polyvinyl alcohol, polyacrylic acid, cellulose and a combination thereof.

The present disclosure is directed to methods for production of composites of carbon nanotubes and electrode active material from liquid dispersions. Composites thusly produced may be used as self-standing electrodes without binder or collector. Moreover, the method of the present disclosure may allow more cost-efficient production while simultaneously affording control over nanotube loading and composite thickness.

The present disclosure relates to a method of making carbon nanotube supported self-standing electrodes embedded in a polymer based battery packaging material. The present disclosure further relates to a method of continuously making carbon nanotube supported self-standing electrodes embedded in a polymer based battery packaging material. The resulting self-standing electrodes may be used in a wearable and flexible battery.

An ion-conducting material, a core-shell structure containing the ion-conducting material, an electrode prepared with the core-shell structure and a metal-ion battery employing the electrode are provided. The core-shell structure includes a core particle and an organic-inorganic composite layer formed on the surface of the core particle for encapsulating the core particle. The core particle includes lithium cobalt oxide, lithium nickel cobalt oxide, lithium nickel cobalt manganese oxide, or lithium nickel cobalt aluminum oxide. Also, the organic-inorganic composite layer includes nitrogen-containing hyperbranched polymer and an ion-conducting material. The ion-conducting material is a lithium-containing linear polymer or a modified Prussian blue, wherein the modified Prussian blue has an ion-conducting group and the lithium-containing linear polymer has an ion-conducting segment.

A process for the recovery of lithium from waste lithium ion batteries or parts thereof is disclosed. The process comprising the steps of A) providing a crude lithium hydroxide as a solid, which contains fluoride; and (B) dissolving the crude lithium hydroxide solid with a lower alcohol such as methanol or ethanol provides good separation of lithium in high purity.

Provided are a paste for a secondary battery, and method of producing the same, with which it is possible to produce an electrode that can reduce internal resistance of a secondary battery and that can cause the secondary battery to display excellent cycle characteristics. The paste for a secondary battery contains a conductive additive, a polymer, and a dispersion medium. The conductive additive includes one or more carbon nanotubes having a surface base content of not less than 0.01 mmol/g and not more than 0.10 mmol/g and a ratio of surface acid content relative to the surface base content of not less than 0.1 and not more than 1.0.

An electrochemical apparatus includes an electrode plate including a current collector, a first coating layer, and a second coating layer. The first coating layer is provided between the current collector and the second coating layer. The second coating layer includes a first active material. R2*d/D<R1, wherein R1 refers to a resistance of the first coating layer, R2 refers to a resistance of the second coating layer, d refers to a thickness of the first coating layer, D refers to a thickness of the second coating layer, R2 and R1 are measured in ohms, and D and d are measured in microns.

Lithium secondary batteries for improving life span and resistance properties are disclosed. In an aspect, a cathode composition for a lithium secondary battery includes a cathode active material that includes a first cathode active material particle having a secondary particle shape and a second cathode active material particle having a single particle shape, and a conductive material including a linear-type conductive material.

A lithium-ion secondary battery is provided, where an electrolyte solution of the lithium-ion secondary battery comprises a highly heat-stable salt (M.sup.y+).sub.x/yR.sub.1(SO.sub.2N.sup.−).sub.xSO.sub.2R.sub.2, where the M.sup.y+ is a metal ion, R.sub.1 and R.sub.2 are each independently a fluorine atom, an alkyl with 1-20 carbon atoms, a fluoroalkyl with 1-20 carbon atoms, or a fluoroalkoxy with 1-20 carton atoms, x is 1, 2, or 3, and y is 1, 2, or 3. A mass percent of the salt in the electrolyte solution is set as k2%; a temperature rise coefficient k1 of the positive electrode sheet satisfies 2.5≤k1≤32, where k1=Cw/Mc, Cw is a positive electrode material load per unit area (mg/cm.sup.2) on the surface of any side of the positive electrode current collector on which a positive electrode material layer is loaded, and Mc is a carbon content (%) of the positive electrode material layer; and the lithium-ion secondary battery satisfies 0.34≤k2/k1≤8.

Provided is a positive electrode manufacturing method including the step of mixing carbon particles, a first binder, a first dispersant, and a first solvent to form a first dispersion, the step of mixing carbon nanotubes, a second binder, a second dispersant, and a second solvent to form a second dispersion, the step of mixing one of the first dispersion or the second dispersion with a positive electrode active material to form a third dispersion, the step of mixing the other one of the first dispersion or the second dispersion with the third dispersion to form a fourth dispersion, and the step of applying the fourth dispersion to a positive electrode current collector to form a positive electrode material mixture layer.