A low oxygen-type silicon nanoparticle-containing slurry that can inhibit a viscosity increase along with the nanosizing of silicon particles is provided. The low oxygen-type silicon nanoparticle-containing slurry can be used for the production of a lithium-ion secondary battery having excellent charge-discharge characteristics such as charge-discharge capacity, initial coulombic efficiency, and charge-discharge cycle characteristics. The low oxygen-type silicon nanoparticle-containing slurry contains low oxygen-type silicon nanoparticles, a nonaqueous solvent, and an additive. The low oxygen-type silicon nanoparticles have a ratio of a peak area (ii) in a range of −100 to −110 ppm to a peak area (i) in a range of −75 to −85 ppm [a (ii)/(i) ratio] of 1.0 or less in .sup.29Si-NMR.

A composition for an electrochemical device, the composition containing a single-walled carbon nanotube, a binder and a solvent. The binder contains a fluorine-containing copolymer containing a vinylidene fluoride unit and a fluorinated monomer unit other than the vinylidene fluoride unit, and the content of the vinylidene fluoride unit in the fluorine-containing copolymer is 50.0 mol % or more relative to total monomer units. Also disclosed is a positive electrode mixture including the composition and a positive electrode structure including a current collector and the positive electrode mixture layer provided on one or both sides of the current collector.

The present invention relates to an anode active material for lithium secondary battery and a lithium secondary battery comprising the same. The anode active material for lithium secondary batteries comprises two kinds of crystalline carbon, with the peak intensity ratio of 3R(101) face to 2H(100) face I.sub.3R(101)/I.sub.2H(100) ranging from 0.55 to 0.7 in an X-ray diffraction pattern.

An electrochemical device, which is a non-aqueous electrochemical device, comprising a polymer (P) enclosed in an inside of the electrochemical device, wherein the polymer (P) is a polymer having a molecular structure containing a unit (P) represented by the following formula (P), the polymer (P) having a weight-average molecular weight of greater than 50,000, as well as an electrode for an electrochemical device, a coating liquid for an electrochemical device, an insulating layer for an electrochemical device, an undercoat layer for an electrochemical device, and an electrolytic solution for an electrochemical device including the polymer (P) and other ingredients:

##STR00001## in the formula (P), R.sup.P is a group of 1 to 20 carbon atoms.

A method of manufacturing a free-standing electrode film includes preparing a mixture including an electrode active material, a binder, and an additive solution or conductive paste, the additive solution or conductive paste being in an amount less than 5% by weight of the mixture and including a polymer additive and a liquid carrier, as well as a conductive material in the case of a conductive paste. The mixture may have total solid contents greater than 95% by weight. Preparing the mixture may include mixing the additive solution or conductive paste with the electrode active material to lubricate the electrode active material and subsequently adding and mixing in the binder. The method may further include subjecting the mixture to a shear force and, after the mixture has been subjected to the shear force, pressing the mixture into a free-standing film.

A composite for use the manufacture of an electrode, the composition comprising a spontaneously formed segregated network of nanosheets of conducting materials, or a combination thereof, and a particulate active material, in which no additional polymeric binder or conductive-additive are required.

A secondary battery includes a positive electrode, a negative electrode, and an electrolytic solution. The positive electrode includes a positive electrode active material layer. The positive electrode active material layer includes a lithium-nickel composite oxide of a layered rock-salt type.

A secondary battery includes a positive electrode, a negative electrode, and an electrolytic solution. The positive electrode includes a positive electrode active material layer. The positive electrode active material layer includes a lithium-nickel composite oxide of a layered rock-salt type.

An energy storage device can include a cathode, an anode, and a separator between the cathode and the anode, where the anode and/or electrode includes an electrode film having a super-fibrillized binder material and carbon. The electrode film can have a reduced quantity of the binder material while maintaining desired mechanical and/or electrical properties. A process for fabricating the electrode film may include a fibrillization process using reduced speed and/or increased process pressure such that fibrillization of the binder material can be increased. The electrode film may include an electrical conductivity promoting additive to facilitate decreased equivalent series resistance performance. Increasing fibrillization of the binder material may facilitate formation of thinner electrode films, such as dry electrode films.

An energy storage device can include a cathode, an anode, and a separator between the cathode and the anode, where the anode and/or electrode includes an electrode film having a super-fibrillized binder material and carbon. The electrode film can have a reduced quantity of the binder material while maintaining desired mechanical and/or electrical properties. A process for fabricating the electrode film may include a fibrillization process using reduced speed and/or increased process pressure such that fibrillization of the binder material can be increased. The electrode film may include an electrical conductivity promoting additive to facilitate decreased equivalent series resistance performance. Increasing fibrillization of the binder material may facilitate formation of thinner electrode films, such as dry electrode films.