The purpose of the present technology is to provide an electrode for power storage device and a power storage device that make it possible to involve more lithium ions in a charge-discharge reaction. A lithium-ion secondary battery has: a positive electrode current collector; a positive electrode active material layer on the positive electrode current collector; a negative electrode current collector; and a negative electrode active material layer on the negative electrode current collector. The negative electrode active material layer has a carbon nanowall. The carbon nanowall is capable of involving, in the charge-discharge reaction, two or more lithium ions per carbon atom in a single charge or discharge.

The purpose of the present technology is to provide an electrode for power storage device and a power storage device that make it possible to involve more lithium ions in a charge-discharge reaction. A lithium-ion secondary battery has: a positive electrode current collector; a positive electrode active material layer on the positive electrode current collector; a negative electrode current collector; and a negative electrode active material layer on the negative electrode current collector. The negative electrode active material layer has a carbon nanowall. The carbon nanowall is capable of involving, in the charge-discharge reaction, two or more lithium ions per carbon atom in a single charge or discharge.

The embodiments of the present disclosure relate to a method and apparatus for producing a carbon nanomaterial product (CNM) product that may comprise carbon nanotubes and various other allotropes of nanocarbon. The method and apparatus employ a consumable carbon dioxide (CO.sub.2) and a renewable carbonate electrolyte as reactants in an electrolysis reaction in order to make CNTs. In some embodiments of the present disclosure, operational conditions of the electrolysis reaction may be varied in order to produce the CNM product with a greater incidence of a desired allotrope of nanocarbon or a desired combination of two or more allotropes.

A system and process for producing doped carbon nanomaterials is disclosed. A carbonate electrolyte including a doping component is provided during the electrolysis between an anode and a cathode immersed in carbonate electrolyte contained in a cell. The carbonate electrolyte is heated to a molten state. An electrical current is applied to the anode, and cathode, to the molten carbonate electrolyte disposed between the anode and cathode. A morphology element maximizes carbon nanotubes, versus graphene versus carbon nano-onion versus hollow carbon nano-sphere nanomaterial product. The resulting carbon nanomaterial growth is collected from the cathode of the cell.

A system and process for producing doped carbon nanomaterials is disclosed. A carbonate electrolyte including a doping component is provided during the electrolysis between an anode and a cathode immersed in carbonate electrolyte contained in a cell. The carbonate electrolyte is heated to a molten state. An electrical current is applied to the anode, and cathode, to the molten carbonate electrolyte disposed between the anode and cathode. A morphology element maximizes carbon nanotubes, versus graphene versus carbon nano-onion versus hollow carbon nano-sphere nanomaterial product. The resulting carbon nanomaterial growth is collected from the cathode of the cell.

The embodiments of the present disclosure relate to a method, system and composition producing a magnetic carbon nanomaterial product that may comprise carbon nanotubes (CNTs) at least some of which are magnetic CNTs (mCNTs). The method and apparatus employ carbon dioxide (CO.sub.2) as a reactant in an electrolysis reaction in order to make mCNTs. In some embodiments of the present disclosure, a magnetic additive component is included as a reactant in the method and as a portion of one or more components in the system or composition to facilitate a magnetic material addition process, a carbide nucleation process or both during the electrosynthesis reaction for making magnetic carbon nanomaterials.

A method for producing a spherical nanocarbon fiber assembly, including: freezing a dispersion liquid containing cellulose nanofibers by spraying the dispersion liquid on a brine solution to obtain a frozen product; drying the frozen product in a vacuum to obtain a dried product; and heating the dried product in an atmosphere that does not burn the dried product, thereby carbonizing the dried product to obtain a spherical nanocarbon fiber assembly.

A method for producing a spherical nanocarbon fiber assembly, including: freezing a dispersion liquid containing cellulose nanofibers by spraying the dispersion liquid on a brine solution to obtain a frozen product; drying the frozen product in a vacuum to obtain a dried product; and heating the dried product in an atmosphere that does not burn the dried product, thereby carbonizing the dried product to obtain a spherical nanocarbon fiber assembly.

A dispersion liquid of the present invention includes: a carbon nanohorn aggregate obtained by aggregating a plurality of single-walled carbon nanohorns in a fibrous form; and a solvent.

A dispersion liquid of the present invention includes: a carbon nanohorn aggregate obtained by aggregating a plurality of single-walled carbon nanohorns in a fibrous form; and a solvent.