Shin-etsu Chemical Co., Ltd.

Satoru Miyawaki

Mikio Aramata

Hirofumi Fukuoka

Meguru Kashida

Kazuma Momii

Susumu Ueno

Tetsuo Nakanishi

Takeshi Fukuda

Shoji Ichinohe

Toshio Ohba

Kouichi Urano

Koichiro Watanabe

Kenji O&otilde;ka

Ikeda Tatsuhiko

A silicon composite comprises silicon particles whose surface is at least partially coated with a silicon carbide layer. It is prepared by subjecting a silicon powder to thermal CVD with an organic hydrocarbon gas and/or vapor at 900-1,400&#xb0; C., and heating the powder for removing an excess free carbon layer from the surface through oxidative decomposition.

Silicon composite, making method, and non-aqueous electrolyte secondary cell negative electrode material

A separator carries lithium particles on its surface. Using the separator, a non-aqueous electrolyte secondary battery having a high initial efficiency and improved cycle retentivity is available.

Separator for non-aqueous secondary battery, making method, and non-aqueous electrolyte secondary battery

An efficient method for producing a silicon oxide powder at a low cost is provided. This method comprises the steps of heating a powder mixture of a silicon dioxide powder and a metal silicon powder to a temperature of 1,100 to 1,450&#xb0; C. in an inert gas or under reduced pressure to generate silicon monoxide gas, and precipitating the silicon monoxide gas on a surface of a substrate to produce the silicon oxide powder, and in this method, the silicon dioxide powder has an average particle diameter of up to 1 &#x3bc;m, and the metal silicon powder has an average particle diameter of 30 &#x3bc;m.

Method for producing silicon oxide powder

Silicon composite particles are prepared by sintering primary fine particles of silicon, silicon alloy or silicon oxide together with an organosilicon compound. Sintering of the organosilicon compound results in a silicon-base inorganic compound which serves as a binder. Each particle has the structure that silicon or silicon alloy fine particles are dispersed in the silicon-base inorganic compound binder, and voids are present within the particle.

Silicon composite particles, preparation thereof, and negative electrode material for non-aqueous electrolyte secondary cell

A silicon-silicon oxide-lithium composite comprises a silicon-silicon oxide composite having such a structure that silicon grains having a size of 0.5-50 nm are dispersed in silicon oxide, the silicon-silicon oxide composite being doped with lithium. Using the silicon-silicon oxide-lithium composite as a negative electrode material, a lithium ion secondary cell having a high initial efficiency and improved cycle performance can be constructed.

Silicon-silicon oxide-lithium composite, making method, and non-aqueous electrolyte secondary cell negative electrode material

A carbonate-modified silane or siloxane is combined with a non-aqueous solvent and an electrolyte salt to form a non-aqueous electrolytic solution, which is used to construct a secondary battery having improved charge/discharge characteristics.

Non-aqueous electrolytic solution, secondary battery, and electrochemical capacitor

A Si&#x2014;C&#x2014;O composite powder is obtained by curing a reactive silane or siloxane having crosslinkable groups through heat curing or catalytic reaction into a crosslinked product and sintering the crosslinked product in an inert gas stream at a temperature of 700-1,400&#xb0; C. into an inorganic state. It exhibits satisfactory cycle performance when used as the negative electrode material for non-aqueous electrolyte secondary cells.

Si-C-O composite, making method, and non-aqueous electrolyte secondary cell negative electrode material

A cyclic carbonate-modified silane or siloxane is combined with a non-aqueous solvent and an electrolyte salt to form a non-aqueous electrolytic solution, which is used to construct a secondary battery having improved temperature and high-output characteristics.

Cyclic carbonate-modified organosilicon compound, non-aqueous electrolytic solution, secondary battery and capacitor

A non-aqueous electrolytic solution is provided comprising a non-aqueous solvent, an electrolyte salt, and a siloxane modified with ether bond-bearing organic group. A non-aqueous electrolyte secondary battery using the same has improved characteristics both at low temperatures and at high outputs.

Non-aqueous electrolytic solution and battery

A siloxane modified with a cyclic carbonate of the formula: is combined with a non-aqueous solvent and an electrolyte salt to form a non-aqueous electrolytic solution, which is used to construct a secondary battery having improved temperature and cycle characteristics.

Cyclic carbonate-modified siloxane, method of making, non-aqueous electrolytic solution, secondary battery, and capacitor

A non-aqueous electrolyte secondary battery negative electrode material is provided wherein a negative electrode active material containing a lithium ion-occluding and releasing material which has been treated with an organosilicon base surface treating agent is surface coated with a conductive coating. Using the negative electrode material, a lithium ion secondary battery having a high capacity and improved cycle performance is obtainable.

Non-aqueous electrolyte secondary battery negative electrode material, making method, and lithium ion secondary battery

A non-aqueous electrolytic solution is provided comprising a non-aqueous solvent, an electrolyte salt, and a siloxane-modified polyoxyalkylene compound having (poly)organosiloxane structures at both ends of polyoxyalkylene. A secondary battery using the same has improved temperature characteristics and high-output characteristics.

Non-aqueous electrolytic solution and secondary battery

A conductive silicon composite in which particles of the structure that silicon crystallites are dispersed in silicon dioxide are coated on their surfaces with carbon affords satisfactory cycle performance when used as the negative electrode material in a non-aqueous electrolyte secondary cell.

Conductive silicon composite, preparation thereof, and negative electrode material for non-aqueous electrolyte secondary cell

A lithium ion secondary cell having a high capacity, improved first charge/discharge efficiency and improved cycle performance is obtainable using as the negative electrode material a lithium-containing silicon oxide powder having the formula: SiLiOwherein x and y are 0&#x3c;x&#x3c;1.0 and 0&#x3c;y&#x3c;1.5, with the lithium being fused and partially crystallized.

Lithium-containing silicon oxide powder and making method

A silicon oxide powder represented by the formula: SiOx wherein 1.05&lE;x&lE;1.5 and having a BET specific surface area of 5-300 m /g is useful as a negative electrode material to construct a lithium ion secondary cell having a high capacity and improved cycle performance.

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Annaka, Japan

Satoru Miyawaki