Jnc Corporation

Jnc Petrochemical Corporation

Yoshihito Takano

Masakazu Kondo

Tetsuro Kizaki

Hirotsuna Yamada

Akira Takahashi

Miwako Nishimura

Keizo Iwatani

Soichiro Sato

Keiichiro Kanao

A silicon nanoparticle-containing hydrogen polysilsesquioxane sintered product-metal oxide complex comprising a silicon nanoparticle-containing hydrogen polysilsesquioxane sintered product and a metal oxide, wherein the silicon nanoparticle-containing hydrogen polysilsesquioxane sintered product contains 5 wt % to 95 wt % of silicon nanoparticles having a volume-based mean particle size of more than 10 nm but less than 500 nm, and a hydrogen polysilsesquioxane-derived silicon oxide structure that coats the silicon nanoparticles and is chemically bonded to the surfaces of the silicon nanoparticles. The silicon nanoparticle-containing hydrogen polysilsesquioxane sintered product is represented by the general formula SiOH(0.01&#x3c;x&#x3c;1.35, 0&#x3c;y&#x3c;0.35) and has Si&#x2014;H bonds. The metal oxide consists of one or more metals selected from titanium, zinc, zirconium, aluminum, and iron.

Silicon nanoparticle-containing hydrogen polysilsesquioxane calcined product-metal oxide complex and production method thereof, negative electrode active material for lithium ion battery, negative electrode for the lithium ion battery and lithium ion battery

A material for a negative electrode active material having capability of achieving excellent cycle performance while maintaining satisfactory initial efficiency (initial capacity), a production method for the material, a composition for a negative electrode, using the material, a negative electrode, and a secondary battery. A core-shell structure that includes the following components (A) and (B), and satisfies the following conditions (i) and (ii): (A): a core containing at least Si (silicon), O (oxygen) and C (carbon) as a constituent element, and containing crystalline carbon and non-crystalline carbon as a constituent; and (B): a shell encapsulating the core, and including a SiOC structure having a graphene layer, and (i): having an atomic composition represented by formula SiOC(0.5&#x3c;x&#x3c;1.8, 1.0&#x3c;y&#x3c;5.0), and (ii): having a predetermined value of less than 1.0&#xd7;10&#x3a9;&#xb7;cm in specific resistance determined by powder resistance measurement.

Core-shell structure and production method therefof, composition for negative electrode using the core-shell structure as negative electrode active material, negative electrode and secondary battery

Provided is a silicon nanoparticle-containing hydrogen polysilsesquioxane sintered product that is represented by the general formula SiOH(0.01&#x3c;x&#x2264;0.3, 0&#x3c;y&#x3c;0.35) and has Si&#x2014;H bonds, said silicon nanoparticle-containing hydrogen polysilsesquioxane sintered product being characterized by (A) including more than 65.0 wt % of silicon nanoparticles that have a volume-based average particle size of 10-500 nm, exclusive, and that do not include particles having a particle size of 1000 nm or larger, and (B) including a silicon oxide structure derived from hydrogen polysilsesquioxane that coats the silicon nanoparticles and is chemically bonded to the surfaces of the silicon nanoparticles.

Silicon nanoparticle-containing hydrogen polysilsesquioxane calcined product, negative electrode active material for lithium ion battery, negative electrode for lithium ion battery and lithium ion battery

Polysilsesquioxane covering silicon nanoparticles, or a calcined product thereof, comprising silicon nanoparticles, which have a volume-basis mean particle size of 10-500 nm, exclusive, and do not include particles having a particle size of 1000 nm or larger, and polysilsesquioxane, which covers the silicon nanoparticles and is chemically bonded to the surfaces of the silicon nanoparticles, said polysilsesquioxane covering silicon nanoparticles or the calcined product thereof having Si&#x2014;H bonds. When observed using a transmission electron microscope (TEM), the thickness of the polysilsesquioxane is 1-30 nm, inclusive.

Polysilsesquioxane covered silicon nanoparticles or calcined product thereof and production method thereof, negative electrode active material for lithium ion battery, negative electrode for lithium ion battery and lithium ion battery

A silicon nanoparticle-containing hydrogen polysilsesquioxane calcined product to be covered by the invention, represented by general formula SiOH(0.3&#x3c;x2&#x3c;1.5, 0.01&#x3c;y2&#x3c;0.35), containing 5% by weight to 65% by weight of silicon nanoparticles having a volume-basis mean particle size of more than 10 nanometers and less than 500 nanometers, having a chemical bond between a surface of the silicon nanoparticles and a silicon oxide structure derived from hydrogen polysilsesquioxane, having a Si&#x2014;H bond, and substantially containing no carbon is silicon oxide applicable to a negative electrode active material for a secondary battery having excellent discharging capacity, initial charging and discharging efficiency and cycle characteristics.

Silicon nanoparticle-containing hydrogen polysilsesquioxane, calcined product thereof, production method therefor, active material, negative electrode, and lithium ion battery

A negative electrode active material for the lithium ion secondary battery contains silicon oxide that is obtained by heat-treating, under an inert gas atmosphere, a hydrogen silsesquioxane polymer (HPSQ) obtained by allowing hydrolysis of a silicon compound represented by formula (1) and then a condensation reaction of the resulting material, contains Si, O and H, and has, in an infrared spectrum, a ratio (I/I) in the range of 0.01 to 0.35 with regard to intensity (I) of peak 1 at 820 to 920 cmdue to a Si&#x2014;H bond to intensity (I) of peak 2 at 1000 to 1200 cmdue to a Si&#x2014;O&#x2014;Si bond, and is represented by general formula SiOH(1&#x3c;x&#x3c;1.8, 0.01&#x3c;y&#x3c;0.4): HSi(R)(1), in which R is groups selected from hydrogen, alkoxy having 1 to 10 carbons and the like.

Negative electrode active material for lithium ion secondary battery and method for producing same

A method for producing a negative electrode active material for lithium ion secondary batteries containing a silicon-titanium oxide composite, which is characterized in that: the silicon-titanium oxide composite contained in the negative electrode active material for lithium ion secondary batteries is obtained by coating a silicon oxide by a titanium oxide; the silicon oxide is obtained by subjecting a polymerized silsesquioxane (PSQ), which has a structure of formula (1) and is obtained by subjecting a silicon compound to hydrolysis and a condensation polymerization reaction, to a heat treatment in an inert gas atmosphere, and is represented by general formula SiOxCyHz (wherein 0.5&#x3c;x&#x3c;1.8, 0&#x2264;y&#x3c;5 and 0&#x2264;z&#x3c;0.4); and after coating the silicon oxide with a titanium oxide, the resulting product is subjected to a heat treatment in a reducing gas atmosphere.

Method for producing negative electrode active material for lithium ion secondary batteries

A composition for a secondary battery negative electrode including a carbonaceous material (a) and a silicon oxide structure (b), wherein the silicon oxide structure (b) includes a silicon oxide framework containing Si and O in its atomic composition and silicon-based nanoparticles that are chemically bonded to the silicon oxide framework as components, wherein the silicon oxide structure (b) is contained in a proportion of 15 mass % or more with respect to a total amount of the carbonaceous material (a) and the silicon oxide structure (b), and wherein the silicon oxide structure (b) satisfies the following conditions (i) to (iii): (i) having an atomic composition represented by a general formula SiOH(0.3&#x3c;x2&#x3c;1.5, 0.01&#x3c;y2&#x3c;0.35), (ii) having Si&#x2014;H bonds, and (iii) being essentially free of carbon.

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Chiba, Japan

Yoshihito Takano