Kureha Kagaku Kogyo Kabushiki Kaisha

Kuraray Co., Ltd.

Kureha Kagaku Kogyo K.k.

Kureha Corporation

Kuraray Chemical Co., Ltd.

Other

Jiro Masuko

Naohiro Sonobe

Hideharu Iwasaki

Yoshikatsu Satake

Yasuhiro Tada

Hajime Komatsu

Yoshiyuki Inaguma

Kiyoto Otsuka

Kenichi Koyakumaru

Junichi Arima

Takao Iwasaki

Minoru Ishikawa

Shinya Tago

Akimi Ogawa

Atsuo Omaru

Shinichiro Yamada

Hiroshi Imoto

Masayuki Nagamine

Hideto Azuma

Fumio Shibata

Makoto Imaji

Kenta Aoki

Koji Sekai

Mayu Komatsu

Akio Hoshi

Yasushi Ebihara

Tomoyuki Aita

Junsang Cho

Tadashi Senoo

The object of the present invention is to provide a carbonaceous material which is obtainable from plant-derived char and has a decreased specific surface area. Further, the object of the present invention is to provide a non-aqueous electrolyte secondary battery having excellent dedoping capacity, non-dedoping capacity, and charge-discharge efficiency. The object can be solved by a carbonaceous material for non-aqueous electrolyte secondary batteries characterized in that the carbonaceous material is obtained by heat-treating plant-derived char which is demineralized in gas-phase, and carbon precursor or volatile organic compound under a non-oxidizing gas atmosphere; and a specific surface area determined by a BET method is 10 m/g or less.

Carbon material for nonaqueous electrolyte secondary battery and method for manufacturing same, and negative electrode using carbon material and nonaqueous electrolyte secondary battery

The object of the present invention is to provide a manufacturing method of carbonaceous material for a negative electrode of lithium ion capacitors, wherein the carbonaceous material is obtained from plant-derived char as a source, potassium and iron are sufficiently removed, and an average particle diameter thereof is small; and a carbonaceous material for a negative electrode of lithium ion capacitors. The object can be solved by a method for manufacturing a carbonaceous material having an average diameter of 3 to 30 &#x3bc;m, for a negative electrode of lithium ion capacitors comprising the steps of: (1) heating plant-derived char having an average particle diameter of 100 to 10000 &#x3bc;m at 500&#xb0; C. to 1250&#xb0; C. under an inert gas atmosphere containing a halogen compound to demineralize in a gas-phase, (2) pulverizing a carbon precursor obtained by the demineralization in a gas-phase, (3) calcining the pulverized carbon precursor at less than 1100&#xb0; C. under a non-oxidizing gas atmosphere.

Carbonaceous material for negative electrodes of lithium ion capacitors and method for producing same

Provided is a manufacturing method of carbonaceous material for a negative electrode of non-aqueous electrolyte secondary batteries, wherein the carbonaceous material is obtained from plant-derived char as a source, potassium is sufficiently removed, and an average particle diameter thereof is small; and a carbonaceous material for a negative electrode of non-aqueous electrolyte secondary batteries. The method for manufacturing a carbonaceous material having an average particle diameter of 3 to 30 &#x3bc;m, for a negative electrode of non-aqueous electrolyte secondary batteries includes the steps of: (1) heating plant-derived char having an average particle diameter of 100 to 10000 &#x3bc;m at 500&#xb0; C. to 1250&#xb0; C. under an inert gas atmosphere containing halogen compound to demineralize in a gas-phase, (2) pulverizing a carbon precursor obtained by demineralization in a gas-phase, (3) calcining the pulverized carbon precursor at 1000&#xb0; C. to 1600&#xb0; C. under an non-oxidizing gas atmosphere.

Carbonaceous material for negative electrodes of nonaqueous electrolyte secondary batteries and method for producing same

A carbonaceous electrode having improved capacities for doping and dedoping of a cell active substance, such as lithium, and suitable for a non-aqueous secondary battery, is constituted by a carbonaceous material obtained by carbonizing an aromatic condensation polymer formed by condensation of an aromatic compound having a phenolic hydroxy group and an aldehyde. The carbonaceous material is characterized by an atomic ratio H/C between hydrogen atoms and carbon atoms of below 0.1, a carbon dioxide adsorption capacity of at least 10 ml/g, and an X-ray scattering intensity ratio I /I of at least 0.25, wherein I and I represent scattering intensities as measured in a wet state and a dry state, respectively, at a parameter s&equals;2&middot;sin &thgr;/&lgr; of 0.5 nm , wherein &thgr; denotes a scattering angle and &lgr; denotes a wavelength of X-rays in X-ray small-angle scattering measurement.

Carbonaceous electrode material for secondary battery

A carbonaceous electrode having improved capacities for doping and dedoping of a cell active substance, such as lithium, and suitable for a non-aqueous solvent secondary battery, is constituted by a carbonaceous material having a true density as measured by a butanol substitution method of at most 1.46 g/cm , a true density as measured by a helium substitution method of at least 1.7 g/cm , a hydrogen-to-carbon atomic ratio H/C of at most 0.15 as measured according to elementary analysis, a BET specific surface area of at most 50 m /g as measured by nitrogen adsorption BET method, and a carbon dioxide adsorption capacity of at least 10 ml/g. The carbonaceous material is advantageously produced by carbonizing an organic material originated from bamboo genera of family Gramineae, particularly genus Pleioblastus or Bambusa, at 1000-1400&deg; C. under a reduced pressure or under a flowing inert gas stream to provide an appropriate porous structure.

Carbonaceous electrode material for non-aqueous secondary battery

A carbonaceous electrode having improved capacities for doping and dedoping of a cell active substance, such as lithium, and suitable for a non-aqueous solvent-type secondary battery, is constituted by a carbonaceous material having a pore volume of at least 0.55 ml/g of pores having a pore diameter of at most 5 &mgr;m as measured by mercury injection method, a potassium content of at most 0.5 wt. % as measured by fluorescent X-ray analysis, and a specific surface area of at most 100 m,/g as measured by nitrogen adsorption BET method. The carbonaceous material is advantageous produced by carbonizing a carbon precursor of plant origin having a potassium content of at most 0.5 wt. % as measured by fluorescent X-ray analysis, in contact with a stream of an inert gas optionally containing a halogen gas at a temperature of 700-1500&deg; C.

Carbonaceous electrode material for secondary battery and process for production thereof

A carbonaceous electrode having improved capacities for doping and dedoping of a cell active substance, such as lithium, and suitable for a non-aqueous solvent-type secondary battery, is constituted by a carbonaceous material having a specific microtexture. The carbonaceous material is characterized by an average (002)-plane spacing of at least 0.365 nm according to X-ray diffraction method, and also a ratio .rho..sub.H /.rho..sub.B of at least 1.15 wherein .rho..sub.H denotes a density measured by using helium gas as a substitution medium and .rho..sub.B denotes a density measured by using butanol as a substitution medium.

A graphitic electrode material suitable for use in a non-aqueous solvent-type secondary battery is provided. The graphitic material is characterized by an average (002)-plane spacing d.sub.002 of 0.336-0.345 nm, a crystallite size along c-axis L.sub.c(002) of 15-60 nm, and a lattice strain .epsilon. of at most 2.0.times.10.sup.-2 nm.sup.-1 as measured by X-ray diffraction method. The graphitic material may suitably be formed through a process including the steps of: thermally polymerizing a condensed polycyclic aromatic compound in the presence of a Lewis acid catalyst to form a polymerizate, and heat-treating the polymerizate at 2100.degree.-2600.degree. C. under a reduced pressure or in an inert gas atmosphere. The graphitic electrode material exhibits large doping and dedoping capacities which provide only a small difference therebetween (i.e., irreversible capacity) and cause only a small decrease at the time of quick charging and discharging.

Graphitic electrode material for secondary battery and process for

A non-aqueous solvent-type secondary battery having a large charge-discharge capacity and exhibiting a high utilization rate of an active substance, such as lithium, and an excellent charge-discharge cycle characteristic, can be constituted by using a carbonaceous electrode material having a specific microtexture. The carbonaceous electrode material is characterized by having an average (002)-plane spacing d.sub.002 of 0.336-0.375 nm and a crystallite size in c-axis direction Lc.sub.(002) of at most 50 nm, respectively, as measured by X-ray diffraction method, and an optically anisotropic texture showing a fine mosaic texture when observed through a polarizing microscope. The carbonaceous material may suitably be produced through a process including the steps of: crosslinking a tar or pitch of a petroleum or coal origin, and carbonizing the crosslinked tar or pitch at a temperature of at least 800.degree. C. under a reduced pressure or in an inert gas atmosphere.

Carbonaceous electrode material for secondary battery and process for

Disclosed herein is a poly(arylene thioether-ketone-ketone) copolymer comprising (A) at least one poly(arylene thioether-ketone-ketone) segment having predominant recurring units of the formula ##STR1## and (B) at least one poly(arylene thioether) segment having predominant recurring units of the formula ##STR2## (a) the ratio of the total amount of the poly(arylene thioether) segment (B) to the total amount of the poly(arylene thioether-ketone-ketone) segment (A) ranging from 0.1 to 9 by weight, (b) the weight-average molecular weight of the poly(arylene thioether) segment (B) being at least 200 but lower than 1000, and (c) said copolymer having a melt viscosity of 2-100,000 poises as measured at 380.degree. C. and a shear rate of 1,200/sec as well as a production process of the poly(arylene thioether-ketone-ketone) copolymer. The copolymer has high crystallinity and heat resistance, uniform composition, and excellent melt stability, processability, handling properties, solvent resistance and moisture absorption resistance.

Poly(arylene thioether-ketone-ketone) copolymer and production process

Disclosed herein is a poly(arylene thioether-ketone-ketone) copolymer comprising (A) at least one poly(arylene thioether-ketone-ketone) segment having predominant recurring units of the formula ##STR1## (B) at least one poly(arylene thioether) segment having predominant recurring units of the formula ##STR2## (a) the ratio of the total amount of the poly(arylene thioether) segment (B) to the total amount of the poly(arylene thioether-ketone-ketone) segment (A) ranging from 0.1 to 9 by weight, (b) the weight-average molecular weight of the poly(arylene thioether) segment (B) being at least 200 but lower than 1000, and (c) said copolymer having a melt viscosity of 2-100,000 poises as measured at 380.degree. C. and a shear rate of 1,200/sec as well as a production process of the poly(arylene thioether-ketone-ketone) copolymer. The copolymer has high crystallinity and heat resistance, uniform composition, and excellent melt stability, processability, handling properties, solvent resistance and moisture absorption resistance.

Poly (arylene thioether-ketone-ketone) copolymer and production process

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Iwaki, Japan

Jiro Masuko