Abstract: Disclosed is a carbon material for lithium ion secondary cell having a positron lifetime of 370 picoseconds or longer, and 480 picoseconds or shorter, when measured by positron annihilation spectroscopy under conditions (A) to (E) below: (A) positron radiation source: positrons generated from electron-positron pairs using an electron accelerator; (B) gamma ray detector: a BaF2 scintillator and a photoelectron multiplier; (C) measurement temperature and atmosphere: 25° C., in vacuum; (D) annihilation ?-ray counts: 3×106 or larger; and (E) positron beam energy: 10 keV.

Abstract: Provided are negative electrode for lithium ion secondary batteries, which is capable of realizing a lithium ion secondary battery having characteristics such as stable output and stable capacity, and a lithium ion secondary battery having characteristics such as stable output and stable capacity. The negative electrode for lithium ion secondary batteries includes a laminated body of a negative electrode material layer that is mainly constituted by a carbonaceous material, and a negative electrode current collector. When the negative electrode material layer is in a dry state, a limit radius of curvature of a negative electrode is 15 mm or less. Content of the hard carbon in the carbonaceous material is preferably 5% by weight to 45% by weight.

Abstract: A method of producing a lithium ion secondary battery includes: a first winding process of winding a positive electrode plate (2) in a roll shape to form a first roll (11) and to provide a curling tendency to the positive electrode plate (2), and of winding a negative electrode plate (3) in a roll shape to form a second roll (12) and to provide a curling tendency to the negative electrode plate (3); and a second winding process of unrolling the positive electrode plate (2) from the first roll (11), unrolling the negative electrode plate (3) from the second roll (12), and winding the unrolled positive electrode plate (2) and negative electrode plate (3) in a roll shape to form a third roll (13) while allowing the positive electrode plate (2) and the negative electrode plate (3) to overlap with each other and maintaining the curling tendency.

Abstract: A carbon material for a lithium ion secondary battery according to the present invention is a carbon material for a lithium ion secondary battery. The carbon material for the lithium ion secondary battery contains a graphite as a major component of the carbon material and a hard carbon. When an amount of the graphite contained in the carbon material is defined as “A” [wt %] and an amount of the hard carbon contained in the carbon material is defined as “B” [wt %], “A” and “B” satisfy a relationship of 1.2?A/B?19 and the amount of the graphite contained in the carbon material is in the range of 55 to 95 wt %. This makes it possible to provide the carbon material for the lithium ion secondary battery, the negative electrode material for the lithium ion secondary battery and the lithium ion secondary battery, which can provide high charge-discharge capacity and superior charge-discharge efficiency in good balance.

Abstract: Disclosed is a carbon material for lithium ion secondary cell having a positron lifetime of 370 picoseconds or longer, and 480 picoseconds or shorter, when measured by positron annihilation spectroscopy under conditions (A) to (E) below: (A) positron radiation source: positrons generated from electron-positron pairs using an electron accelerator; (B) gamma ray detector: a BaF2 scintillator and a photoelectron multiplier; (C) measurement temperature and atmosphere: 25° C., in vacuum; (D) annihilation ?-ray counts: 3×106 or larger; and (E) positron beam energy: 10 keV.

Abstract: The invention provides an anodic carbon material for a lithium secondary battery and a lithium secondary battery anode having excellent charge/discharge cycle characteristics, and a lithium secondary battery using the same. More specifically, an anodic carbon material for a lithium secondary battery according to the present invention comprises: composite particles composed of silicon-containing particles containing an alloy, oxide, nitride, or carbide of silicon capable of occluding and releasing lithium ions and a resinous carbon material enclosing the silicon-containing particles; and a network structure formed from nanofibers and/or nanotubes that bond to surfaces of the composite particles and that enclose the composite particles, and wherein: the network structure contains silicon.

Abstract: The invention aims to improve the charge/discharge cycle characteristics of an anodic carbon material for a lithium secondary battery. An anodic carbon material for a lithium secondary battery according to the present invention comprises: particles containing carbon, or a metal or metalloid, or an alloy, oxide, nitride, or carbide thereof, the particle capable of absorbing and releasing lithium ions; a resinous carbon material enclosing the particles; and a network structure formed from carbon nanofibers and/or carbon nanotubes that bond to the surfaces of the particles and that enclose the particles.

Abstract: A pallet for the cold storage or transportation of goods consists virtually of a single framework molded from a plastics material, and having a hollow interior filled with a refrigerant without the aid of any bag.