An anode active material for lithium-ion battery is provided. The anode active material includes a composite material comprising a binary or multi-element metal alloy and a conductive material. The binary or multi-element metal alloy is granular, a particle size of a binary or multi-element metal alloy particle is in micron-sized, and the binary or multi-element metal alloy has lattice reversibility. The conductive material is coated on a surface of a binary or multi-element metal alloy particle. The binary or multi-element metal alloy particle is completely wrapped by the conductive material. A method of making the anode active material is also provided. A lithium-ion battery using the anode active material is also provided.

Batteries, coating materials and methods for cathode active materials, composition of cathode electrode sheets are disclosed. The battery includes a cathode selected from the group consisting of a nickel-rich material and an iron phosphate material and an ionic-electronic conducting polymeric coating on the cathode.

Novel, rechargeable magnesium/magnesium sulfide batteries are disclosed therein, having energy density competitive with lithium batteries, high cycle life, and lower cost. Production method of stabilized MgS is also described, as well as various cells constructions.

Polymer derived ceramic (PDC) materials, compositions and methods of making high capacity, long cycle, long life battery anodes to improve the performance of batteries of all types, including but not limited to coin cell batteries, electric vehicle (EV) batteries, hybrid electric vehicle (HEV) batteries, plug-in hybrid electric vehicle (PHEV) batteries, battery electric vehicle (BEV) batteries, lithium cobalt (LCO) batteries, lithium iron (LFP) batteries; and lithium-ion (Li) batteries, and lead acid batteries. Silicon is incorporated in the PDC material at a molecular level when reacting a polymer derived ceramic precursor and a silicon hydride constituent or a silicon alkoxide constituent to form a PDC composition useful as a powdered battery anode material. A predetermined amount of divinylbenzene is added as a crosslinker and a modifier to increase free carbon content. The resulting battery anode materials increase the specific capacity of a battery measured in milliampere-hours per gram (mAh/g) and increase the life cycle of a battery while minimizing distortion and stress of the anode structure.

Porous carbon particles, and a positive electrode active material and a lithium secondary battery including the same. This may improve the energy density of the lithium secondary battery by applying a porous electrode containing micropores and mesopores and having a uniform size distribution and shape as a positive electrode material.

Silicon-carbon composite materials and related processes are disclosed that overcome the challenges for providing amorphous nano-sized silicon entrained within porous carbon. Compared to other, inferior materials and processes described in the prior art, the materials and processes disclosed herein find superior utility in various applications, including energy storage devices such as lithium ion batteries.

The present invention relates to composite particles containing silicon and carbon, wherein a domain size region of vacancies of 2 nm or less is 44% by volume or more and 70% by volume or less when volume distribution information of domain sizes obtained by fitting a small-angle X-ray scattering spectrum of the composite particles with a spherical model in a carbon-vacancy binary system is accumulated in ascending order, and a true density calculated by dry density measurement by a constant volume expansion method using helium gas is 1.80 g/cm.sup.3 or more and 2.20 g/cm.sup.3 or less.

A negative electrode including: a negative electrode current collector; and a negative electrode active material layer on at least one surface of the negative electrode current collector. The negative electrode active material layer includes a negative electrode active material, wherein the negative electrode active material includes natural graphite particles, and has a particle strength of 40 MPa to 200 MPa when being plastically deformed.

A battery system comprising: an anode composed of a non-toxic biocompatible metal; a first printable carbon-based current collector comprising biocompatible multiple few layer graphene (FLG) sheets in electrical contact with and extending from the anode; a three-dimensional (3D) hierarchical mesoporous carbon-based cathode including an open porous structure configured to catalyze an active material via gas diffusion; a polymer-based barrier film deposited on the 3D hierarchical mesoporous carbon-based cathode, the polymer-based barrier film configured to prevent oxygen from entering the open porous structure while deposited on the 3D hierarchical mesoporous carbon-based cathode; a second printable carbon-based current collector comprising biocompatible multiple few layer graphene (FLG) sheets in electrical contact with and extending from the cathode; and an electrolyte layer disposed between the anode and the cathode, the electrolyte layer configured to activate the battery system when released into one or both of the anode and the cathode.

A method for producing a negative electrode active material realizing both of improvement in tolerance against the deposition of lithium and improvement in life performance is provided. A method for producing a negative electrode active material includes the steps of preparing graphite particles having a BET specific surface area of 10.3 m.sup.2/g or larger and 12.2 m.sup.2/g or smaller; and coating at least a part of a surface of the graphite particles with amorphous carbon. In the step of coating, at least the part of the surface of the graphite particles is coated with the amorphous carbon such that a value obtained by subtracting a BET specific surface area of the negative electrode active material from a BET specific surface area of the graphite particles is 6.9 m.sup.2/g or larger and 8.3 m.sup.2/g or smaller.