Abstract: A production process for carbon-coated silicon material includes the step of: heating CaSi2 and a halogen-containing polymer at a temperature being a carbonization temperature or more of the halogen-containing polymer in a state where the CaSi2 and the halogen-containing polymer coexist.

Abstract: A silicon material useful as a negative electrode active material is provided. The silicon material has a band gap within a range of greater than 1.1 eV and not greater than 1.7 eV. A secondary battery in which this silicon material is used as a negative electrode active material has improved initial efficiency.

Abstract: A nano silicon material having reduced amounts of oxygen (O) and chlorine (Cl) contained therein is provided. The nano silicon material contains fluorine (F) and nano-sized silicon crystallites. Generation of a layer in which oxygen (O) and chlorine (Cl) are present is suppressed due to the presence of fluorine (F), so that a decrease in the moving speed of lithium ions is suppressed. In addition, due to the presence of fluorine (F), the concentrations of oxygen (O) and chlorine (Cl) are reduced, so that reaction thereof with lithium ions is suppressed.

Abstract: A silicon material useful as a negative electrode active material is provided. The silicon material has an Si/O atom ratio within a range of greater than 1/0.5 and not greater than 1/0.1 and a band gap within a range of greater than 1.1 eV and not greater than 2.1 eV. A secondary battery in which this silicon material is used as a negative electrode active material has long life.

Abstract: To provide an epoxy resin composition that is suitable for producing optical sheets which exhibit excellent transparency, heat resistance, strength, smoothness and light resistance, and a cured product thereof. An epoxy resin composition for optical3 sheets, the composition comprising a polyvalent carboxylic acid (A) represented by formula (I): (wherein, R1's each independently represent a hydrogen atom, an alkyl group having 1 to 15 carbon atoms, or a carboxyl group; q represents the number of substituent R1's, and represents an integer from 1 to 4; and P represents any one of the following x, y and z): (wherein, there may be a plural number of R2's per ring, and R2's each independently represent a hydrogen atom or a methyl group; and * represents a bonding site linked to the oxygen atom; y.

Abstract: Provided is a negative electrode active material including complex particles formed of: nano silicon aggregated particles produced by heating a layered polysilane represented by a composition formula of (SiH)n and having a structure in which multiple six-membered rings formed from silicon atoms are connected; and a composited carbon layer formed from an amorphous carbon and at least covering one portion of the aggregated particles. A mean particle diameter D50 of the aggregated particles is within a range of 0.2 ?m to 30 ?m, and a mean particle diameter D50 of the complex particles is within a range of 0.5 ?m to 40 ?m.

Abstract: A nanometer-size silicon material produced by heat treating a lamellar polysilane exhibits Raman-shift peaks existing at 341±10 cm?1, 360±10 cm?1, 498±10 cm?1, 638±10 cm?1, and 734±10 cm?1 in a Raman spectrum, has a large specific surface area, and has a reduced SiO content.

Abstract: A cured product obtainable by impregnating a glass cloth with an epoxy resin composition that is suitable for producing optical sheets. The epoxy resin composition includes a polyvalent carboxylic acid (A) represented by formula (I): wherein, R1's each independently represent a hydrogen atom, an alkyl group having 1 to 15 carbon atoms, or a carboxyl group; q represents the number of substituent R1's, and represents an integer from 1 to 4; and P represents the following X: wherein there may be a plural number of R2's per ring, and R2's each independently represent a hydrogen atom or a methyl group; and * represents a bonding site linked to the oxygen atom; and an epoxy resin (B) having an aliphatic cyclic structure in the molecule. The cured product has a refractive index at 25° C. of 1.51 or higher.

Abstract: A cured product obtainable by curing an epoxy resin composition that is suitable for producing optical sheets. The epoxy resin composition includes a polyvalent carboxylic acid (A) represented by formula (I): wherein, R1's each independently represent a hydrogen atom, an alkyl group having 1 to 15 carbon atoms, or a carboxyl group; q represents the number of substituent R1's, and represents an integer from 1 to 4; and P represents the following X: wherein there may be a plural number of R2's per ring, and R2's each independently represent a hydrogen atom or a methyl group; and * represents a bonding site linked to the oxygen atom; and an epoxy resin (B) having an aliphatic cyclic structure in the molecule.

Abstract: In a secondary battery, a negative electrode, an electrolytic solution for negative electrode, a diaphragm, an electrolytic solution for positive electrode, and a positive electrode are disposed in order. The negative electrode includes a negative-electrode active material that has an element whose oxidation-reduction potential is more “base” by 1.5 V or more than an oxidation-reduction potential of hydrogen, and whose volume density is larger than that of lithium metal. The diaphragm includes a solid electrolyte transmitting ions of said element alone. A secondary battery with high volumetric density is provided.

Abstract: Problem to be Solved The purpose of the invention, in view of the above circumstances, is to provide a silicone-modified epoxy resin composition that offers a cured article excellent in low gas permeability and strength, and an epoxy resin cured article obtained by curing the composition. Solution An epoxy resin represented by the following formula (1) wherein R1 represents an alkylene group having 2 to 6 carbon atoms and optionally containing an ester or ether bond; R2 represents a monovalent aliphatic hydrocarbon group having 1 to 6 carbon atoms or a monovalent aromatic hydrocarbon group having 6 to 12 carbon atoms; R3 represents an oxygen atom or a phenylene group; k represents 1 to 10 as an average value; m represents an integer of 0 to 2; n represents 0 to 10 as an average value; and a plurality of groups R1, R2, R3, k, or m present in the formula may be the same or different from each other.

Abstract: A negative-electrode active material includes a mixed power of a first active-material powder composed of a granular graphite particle, and a second active-material powder composed of a plate-shaped graphite particle having a thickness of from 0.3 nm to 100 nm and a major-axis-direction length of from 0.1 ?m to 500 ?m. Since the plate-shaped graphite particle has a lam liar structure, the plate-shaped graphite particle excels in the strength and flexibility, and function as a negative-electrode active material because lithium ions come in and out between the layers. Therefore, while securing the flexibility of negative-electrode active-material layer, the contradictory event between the capacity and the conductive property is solved.

Abstract: An epoxy resin composition for optical sheets, the composition comprising a polyvalent carboxylic acid (A) represented by formula (I): wherein R1's each independently represent a hydrogen atom, an alkyl group having 1 to 15 carbon atoms, or a carboxyl group; q represents the number of substituent R1's, and represents an integer from 1 to 4; and P represents the following X: wherein there may be a plural number of R2's per ring, and R2's each independently represent a hydrogen atom or a methyl group; and * represents a bonding site linked to the oxygen atom; and an epoxy resin (B) having an aliphatic cyclic structure in the molecule.

Abstract: Provided is a novel lithium silicate-based material useful as a positive electrode material for lithium ion secondary battery. The lithium silicate-based compound is represented by Li1.5FeSiO4.25. The lithium silicate-based compound is a compound including: lithium (Li); iron (Fe); silicon (Si); and oxygen (O), and expressed by a composition formula, Li1+2?FeSiO4+??c (?0.25???0.25, 0?c?0.5). The lithium silicate-based compound, of which iron (Fe) is trivalent, exerts a remarkable chemical stability as compared to Li2FeSiO4.

Abstract: To provide an epoxy resin composition that is suitable for producing optical sheets which exhibit excellent transparency, heat resistance, strength, smoothness and light resistance, and a cured product thereof. An epoxy resin composition for optical sheets, the composition comprising a polyvalent carboxylic acid (A) represented by formula (I): (wherein, R1's each independently represent a hydrogen atom, an alkyl group having 1 to 15 carbon atoms, or a carboxyl group; q represents the number of substituent R1's, and represents an integer from 1 to 4; and P represents any one of the following x, y and z): (wherein, there may be a plural number of R2's per ring, and R2's each independently represent a hydrogen atom or a methyl group; and * represents a bonding site linked to the oxygen atom; y.

Abstract: To provide an epoxy resin composition that is suitable for producing optical sheets which exhibit excellent transparency, heat resistance, strength, smoothness and light resistance, and a cured product thereof. An epoxy resin composition for optical sheets, the composition comprising a polyvalent carboxylic acid (A) represented by formula (I): (wherein, R1's each independently represent a hydrogen atom, an alkyl group having 1 to 15 carbon atoms, or a carboxyl group; q represents the number of substituent R1's, and represents an integer from 1 to 4; and P represents any one of the following x, y and z): (wherein, there may be a plural number of R2's per ring, and R2's each independently represent a hydrogen atom or a methyl group; and * represents a bonding site linked to the oxygen atom; y.

Abstract: To provide an epoxy resin composition that is suitable for producing optical sheets which exhibit excellent transparency, heat resistance, strength, smoothness and light resistance, and a cured product thereof. An epoxy resin composition for optical 3 sheets, the composition comprising a polyvalent carboxylic acid (A) represented by formula (I): (wherein, R1's each independently represent a hydrogen atom, an alkyl group having 1 to 15 carbon atoms, or a carboxyl group; q represents the number of substituent R1's, and represents an integer from 1 to 4; and P represents any one of the following x, y and z): (wherein, there may be a plural number of R2's per ring, and R2's each independently represent a hydrogen atom or a methyl group; and * represents a bonding site linked to the oxygen atom; y.

Abstract: A negative-electrode active material is used for a negative electrode, the negative-electrode active material including: agglomerated particles including nanometer-size silicon produced by heat treating a lamellar polysilane having a structure in which multiple six-membered rings constituted of a silicon atom are disposed one after another, and expressed by a compositional formula, (SiH)n; and a carbon layer including amorphous carbon, and covering at least some of the agglomerated particles to be composited therewith. An electric storage apparatus including the same is not only able to reduce the irreversible capacity, but also able to inhibit the generation of “SEI.

Abstract: Providing a negative-electrode active material for nonaqueous-electrolyte secondary battery, the negative-electrode active material enabling an output characteristic to upgrade, a production process for the same, a negative electrode for nonaqueous-electrolyte secondary battery, and a nonaqueous-electrolyte secondary battery. The negative-electrode active material includes an Si-metal-carbon composite composed of: a metal/carbon composite matrix including at least one metal selected from the group consisting of Cu, Fe, Ni, Ti, Nb, Zn, In and Sn, at least one member selected from the group consisting of N, O, P and S, and amorphous carbon; and nanometer-size Si particles dispersed in the metal/carbon composite matrix.

Abstract: A nanometer-size silicon material produced by heat treating a lamellar polysilane exhibits Raman-shift peaks existing at 341±10 cm?1, 360±10 cm?1, 498±10 cm?1, 638±10 cm?1, and 734±10 cm?1 in a Raman spectrum, has a large specific surface area, and has a reduced SiO content.