309results about How to "Small volume expansion" patented technology

A method of patterning magnetic material includes forming a ferromagnetic material layer containing one element selected from the group consisting of Fe, Co and Ni on a substrate, selectively masking a surface of the ferromagnetic material layer, and making nonferromagnetic. The making nonferromagnetic step includes exposing an exposed portion in halogen-containing reaction gas, changing magnetism of the exposed portion and a lower layer thereof by chemical reaction, and making the exposed portion a nonferromagnetic material region. A magnetic recording medium is fabricated by using the magnetic material patterning method and includes a plurality of recording regions made of ferromagnetic materials, each containing at least one element selected from the group consisting of Fe, Co and Ni, and a nonferromagnetic material region for separating the recording regions from each other. The nonferromagnetic material region is a compound region of the ferromagnetic material and halogen.

The invention relates to a composite silicon negative electrode material. The composite silicon negative electrode material comprises nanometer silicon, a nanometer composite layer coating the surface of nanometer silicon and a conductive carbon layer uniformly coating the nanometer composite layer, wherein the nanometer composite layer is silicon oxide and metal alloy. According to the composite silicon negative electrode material with a three-layer structure, the nanometer composite layer composed of the silicon oxide and the metal alloy coating the surface of the silicon oxide effectively reduces volume expansion of the nanometer silicon, maintains the characteristic of high conductivity of the silicon material, improves mobility of lithium ions, prevents direct contact between a silicon negative electrode and an electrolyte, and can form a hard SEI film on the surface of the composite silicon negative electrode material, thereby allowing the cycle performance of the material to be substantially enhanced. The composite silicon negative electrode material has the characteristics of high capacity (greater than 1500 mAh / g), long cycle life (with a capacity retention ratio of more than 90% after 300 cycles) and high conductivity. The preparation method for the composite silicon negative electrode material is simple, easily controllable, and applicable to industrial production.

The invention discloses a silicon-carbon composite material which is a composite material similar to a dragon fruit structure. The silicon-carbon composite material comprises a base core, a silicon-carbon composite housing and a coating layer. The silicon-carbon composite housing is formed by uniformly dispersing a plurality of nano silicon particles in conductive carbon. The nano silicon particles are formed by pyrolysis of a silicon source. The conductive carbon is formed by pyrolysis of an organic carbon source. The coating layer is a carbon coating layer. At least one carbon coating layeris provided. The thickness of a single carbon coating layer is 0.2 to 3[mu]m. Compared with the prior art, a silicon-carbon composite material precursor is formed by using vapor phase synchronous deposition, and carbon coating is performed to form the silicon-carbon composite material similar to the dragon fruit structure. The silicon-carbon composite material has a high first effect, low expansion and long circulation, slows down the silicon material grain growth during the heat treatment process, avoids the powdering of the material during the cycle, alleviates the volume expansion effect ofthe silicon-based material, and is improved in the cycle performance, the electrical conductivity and the rate performance.

The invention relates to a non-aqueous electrolyte secondary battery, a negative electrode, a negative electrode material and a preparation of Si-O-Al composite. An Si-O-Al composite comprising silicon, silicon oxide, and aluminum oxide exhibits a powder XRD spectrum in which the intensity of a signal of silicon at 28.3 DEG is 1-9 times the intensity of a signal near 21 DEG. A negative electrode material comprising the Si-O-Al composite is used to construct a non-aqueous electrolyte secondary battery which is improved in 1st cycle charge / discharge efficiency and cycle performance while maintaining the high battery capacity and low volume expansion upon charging of silicon oxide.

In an electronic device realizing high-temperature terminal solder bonding in temperature-level bonding, the bonding portion between the semiconductor device and the substrate is formed by metal balls composed of Cu or the like and a compound composed of the metal balls and Sn, and Metal balls are held together by compounds.