摘要:
An object of the present invention is to provide a carbonaceous material for a negative electrode for producing a nonaqueous electrolyte secondary battery capable of rapid charge and discharge and having excellent rate characteristics (output characteristics) while maintaining a large discharge capacity. The problem described above can be solved by a carbonaceous material for a nonaqueous electrolyte secondary battery negative electrode of the present invention obtained by heat-treating a non-graphitizable carbon precursor which is pulverized and contains from 13 to 80 wt.% of a volatile component. With the present invention, it is possible to provide a carbonaceous material for a nonaqueous electrolyte secondary battery negative electrode, whereby a nonaqueous electrolyte secondary battery having a large charge-discharge capacity and having excellent rate characteristics can be produced.
摘要:
The object of the invention is to provide: a hollow fiber bundle, a method of manufacturing the hollow fiber bundle, a cylindrical module of hollow fiber membrane, and an immersion type module of hollow fiber membrane wherein the hollow fibers are easy to apply scrubbing while maintaining specified intervals among the hollow fibers. A hollow fiber bundle bundling porous hollow fibers, including; hollow fibers 10 that are open at one side end and closed at the other side end; and a closed side potting 60 and an open side potting 50 plate shaped at right angles to the hollow fibers for securing the hollow fibers, in which through holes 30 are disposed on a circumference, the hollow fibers are bundled in a cylindrical shape inside the through holes and disposed with a specified circumferential interval adjacent each other in a circumferential direction and with a specified radial interval adjacent each other in a radial direction, the hollow fibers are bundled outside the through holes disposed at specified peripheral intervals wherein the hollow fibers are disposed with a specified peripheral interval adjacent each other in a peripheral direction in the shape surrounding the outside of the through holes and with a specified peripheral right angle interval adjacent each other in a right angle to the periphery.
摘要:
A hollow-fiber porous membrane comprising a hollow-fiber form of vinylidene fluoride resin and satisfying the following properties (A) and (B), is provided as a hollow-fiber porous membrane of vinylidene fluoride resin having an average pore size and a further uniform pore size distribution (A) and a large water permeation rate regardless of good efficiency of blocking minute particles (bacteria) (B), as represented by: (A) a ratio Pmax (1 m)/Pm of at most 4.0 between a maximum pore size Pmax (1 m) measured at a test length of 1 m according to the bubble point method and an average pore size Pm of 0.05 - 0.20 µm measured according to the half dry method; and (B) a ratio F (L = 200 mm, v = 70 %)/Pm 2 of at least 3000 (m/day·µm 2 ), wherein the ratio F (L = 200 mm, v = 70 %)/Pm 2 denotes a ratio between F (L = 200 mm, v = 70 %) which is a value normalized to a porosity v = 70 % of a water permeation rate F (100 kPa, L = 200 mm) measured at a test length L = 200 mm under the conditions of a pressure difference of 100 kPa and a water temperature of 25°C and a square Pm 2 of an average pore size Pm. The hollow-fiber porous membrane is produced by a process, comprising: subjecting a stretched hollow-fiber porous membrane of vinylidene fluoride resin to at least two stages of relaxation treatment in a non-wetting environment.
摘要:
To provide a binder composition having high adhesion, without producing a copolymer or an aggregate of a copolymer and an electrode active material. A binder composition according to the present invention contains: a first vinylidene fluoride polymer with an inherent viscosity of 1.7 dL/g or higher; and a second vinylidene fluoride polymer containing acrylic acid or methacrylic acid as a monomer unit.
摘要:
An object of the present invention is to provide a method for manufacturing a hollow fiber module that makes it possible to decrease the spacing between a plurality of hollow fiber sheets and facilitate the formation of a potting portion with a two-layer structure. The method for manufacturing a hollow fiber module of a preferred embodiment includes: a first step of preparing a plurality of units in which a plurality of hollow fibers are fixed and provided side by side at the end portion side thereof on plate-shaped members; a second step of laminating the plurality of units so that portions of the plate-shaped members overlap via a first curable resin and filling a partial region on a side opposite the end portion side between the adjacent plate-shaped members with the first curable resin; and a third step of filling a region on the end portion side from the first curable resin between the adjacent plate-shaped members with a second curable resin having a hardness after curing that is higher than that of the first curable resin, and then curing the second curable resin.
摘要:
An object of the present invention is to provide a non-aqueous electrolyte secondary battery having high discharge capacity and high charge/discharge efficiency. The aforementioned problem can be resolved by a carbonaceous material for a non-aqueous electrolyte secondary battery negative electrode, using a plant as a carbon source, where potassium element content is 0.10 wt.% or less, true density determined by a pycnometer method using butanol is from 1.35 to 1.50 g/cm 3 , lithium is electrochemically doped in the carbonaceous material, and in a case where an NMR spectrum of lithium nucleus is measured, a main resonance peak shifted 110 to 160 ppm to a lower magnetic field side is exhibited with regard to a resonance peak of LiCl as a reference substance.
摘要:
Provided is a carbonaceous material for a non-aqueous electrolyte secondary battery anode having high discharge capacity per unit volume and excellent storage characteristics. The carbonaceous material for a non-aqueous electrolyte secondary battery anode of the present invention has a true density (ρ Bt ) determined by a pycnometer method using butanol of not less than 1.55 g/cm 3 and less than 1.75 g/cm 3 and a discharge capacity of an anode at 0.05 V to 1.5 V in terms of a lithium reference electrode standard of not less than 180 mAh/g. Furthermore, the slope 0.9/X (Vg/Ah) of a discharge curve calculated from a discharge capacity X (Ah/g) and a potential difference of 0.9 (V) corresponding to 0.2 V to 1.1 V in terms of a lithium reference electrode standard is not greater than 0.75 (Vg/Ah), and an absorbed moisture quantity after storage for 100 hours in a 25°C 50% RH air atmosphere is not greater than 1.5 wt%.
摘要:
The object of the present invention is to provide a carbonaceous material for an anode of a nonaqueous electrolyte secondary battery which uses a plant-derived organic material as a raw material, has high purity so that alkali metals such as the potassium element and alkali earth metals such as the calcium element are sufficiently removed by de-mineral treatment, and has excellent discharge capacity and efficiency, a novel manufacturing method capable of efficiently mass-producing the carbonaceous material, and a lithium ion secondary battery using the carbonaceous material. The problem described above can be solved by a carbonaceous material for an anode of a nonaqueous electrolyte secondary battery obtained by carbonizing a plant-derived organic material, the atom ratio (H/C) of hydrogen atoms and carbon atoms according to elemental analysis being at most 0.1, the average particle size Dv 50 being from 2 to 50 µm, the average interlayer spacing of the 002 planes determined by powder X-ray diffraction being from 0.365 nm to 0.400 nm, the potassium element content being at most 0.5 mass%, and the calcium element content being at most 0.02 mass%.
摘要:
The object of the invention is to provide: a screen-like object made of hollow fibers, a method of manufacturing a hollow fiber bundle, a cylindrical module of hollow fiber membrane, and an immersion type module of hollow fiber membrane wherein the hollow fibers are easy to bundle while keeping fiber-to-fiber intervals. The screen-like object made of hollow fibers includes: porous hollow fibers 10 disposed parallel at even intervals, tapes 26 for tying together the hollow fibers respectively at both ends of the hollow fibers, and a water-soluble tape for tying together the hollow fibers at a position apart from both ends of the hollow fibers across the hollow fibers. The method of manufacturing a hollow fiber bundle includes: the steps of forming a screen-like object made of hollow fibers, sealing one end or both ends of the hollow fibers, winding up the screen-like object made of hollow fibers so as to bundle the hollow fibers, forming pottings for integrally securing both ends, respectively, of the wound-up screen-like object, and cutting the potting together with the hollow fibers along a plane at right angles to the hollow fibers to cut off a sealed end and to open the hollow fibers.