Nippon Steel Sumitomo Metal Corporation

Nippon Steel Corporation

Nippon Steel Chemical & Material Co., Ltd.

Nippon Micrometal Corporation

Chuo Denki Kogyo Co., Ltd.

Sukeyoshi Yamamoto

Tatsuo Nagata

Noriyuki Negi

Koji Moriguchi

Takashi Fukuda

Takayuki Kobayashi

Masamoto Tanaka

Mitsuharu Yonemura

Akira Taniyama

Masafumi Usui

Shunsuke Taniguchi

Takafumi Amino

Tomoyuki Kakeshita

Keisuke Akashi

Katsuhiko Hoshino

Tsunekazu Yamazaki

Kensuke Misawa

Tomoyuki Terai

Kiyotsugu Komori

Provided is a negative electrode active material which is excellent in capacity, capacity retention ratio, and a coulombic efficiency when charging/discharging is repeated. The chemical composition of the alloy particles of the negative electrode active material of the present disclosure includes 0.50 to 3.00 mass % of oxygen, and alloy elements containing Sn: 13.0 to 40.0 at % and Si: 6.0 to 40.0 at %, with the balance being Cu and impurities. The structure of the alloy particles includes: one or more types selected from the group consisting of a phase having a D0structure, and a δ phase; one or more types selected from the group consisting of an ε phase and an η' phase; and a SiOphase (x=0.50 to 1.70). The SiOphase (x=0.50 to 1.70) has a volume fraction of 5.0 to 60.0% and the η′ phase has a volume fraction of 0 to 60.0%.

Negative electrode active material, negative electrode, and battery

Provided is a joint structure. The joint structure includes a first structure, and a second structure joined to the first structure via a joint portion formed of a Au—Sn-based alloy, wherein a thickness of the joint portion is 3 μm or more and 50 μm or less.

Junction structure, method for manufacturing junction structure, and solder ball

The negative electrode active material according to the present embodiment includes alloy particle containing an alloy component and oxygen of 0.50 to 3.00 mass %. The alloy component contains Sn: 13.0 to 40.0 at % and Si: 6.0 to 40.0 at %. The alloy particle contains: one or two phases selected from a D0phase in which the Si content is from 0 to 5.0 at % and a &#x3b4; phase in which the Si content is from 0 to 5.0 at %; one or two phases selected from an &#x3b5; phase in which the Si content is from 0 to 5.0 at % and an &#x3b7;' phase in which the Si content is from 0 to 5.0 at %; and an SiOx phase. The alloy particle has, in an X-ray diffraction profile, a peak having a largest integrated diffraction intensity in a range of 42.0 to 44.0 degrees of a diffraction angle 2&#x3b8;.

A negative electrode active material is provided that is utilized in a nonaqueous electrolyte secondary battery, and that can improve the capacity per volume and charge-discharge cycle characteristics. The negative electrode active material according to the present embodiment contains an alloy having a chemical composition consisting of, in at %, Sn: 13.0 to 24.5% and Si: 3.0 to 15.0%, with the balance being Cu and impurities. The alloy particles contain a phase with a peak of the most intense diffraction line appearing in a range of 42.0 to 44.0 degrees of a diffraction angle 2&#x3b8;, the most intense diffraction line being a diffraction line having the largest integrated diffraction intensity in an X-ray diffraction profile. A half-width of the most intense diffraction line of the alloy particles is in a range of 0.15 to 2.5 degrees.

Provided is a negative electrode active material that can improve the capacity per volume and charge-discharge cycle characteristics of a nonaqueous electrolyte secondary battery represented by a lithium ion secondary battery. The negative electrode active material according to the present embodiment contains an alloy phase. The alloy phase undergoes thermoelastic diffusionless transformation when releasing or occluding metal ions. The negative electrode active material of the present embodiment is used in a nonaqueous electrolyte secondary battery. Thermoelastic diffusionless transformation refers to so-called thermoelastic martensitic transformation.

Negative electrode active material

Provided is a composite particle which can improve the capacity per volume and charge-discharge cycle characteristics. The composite particle includes a plurality of specific particles and a binding material. The specific particle contains an alloy phase. The alloy phase undergoes thermoelastic diffusionless transformation when releasing metal ions or occluding metal ions. The binding material contains at least one of non-graphite carbon and a carbon precursor. The plurality of specific particles bind with each other via the binding material.

Composite particle, negative electrode and battery

Provided is a negative electrode active material that can improve the discharge capacity per volume and charge-discharge cycle characteristics. The negative electrode active material according to the present embodiment contains an alloy phase. The alloy phase undergoes thermoelastic diffusionless transformation when releasing metal ions or occluding metal ions. The oxygen content of the negative electrode active material is not more than 5000 ppm in mass.

Negative electrode active material, negative electrode and battery

Provided is a negative electrode active material that can improve the discharge capacity per volume and charge-discharge cycle characteristics. The negative electrode active material of the present embodiment includes a powder material and an oxide layer. The powder material contains an alloy phase which undergoes thermoelastic diffusionless transformation when releasing metal ions or occluding the metal ions. The oxide layer is formed on the surface of the powder material, and has a thickness of not more than 10 nm.

Provided is a negative electrode active material which can improve discharge capacity per amount and charge-discharge cycle characteristics. The negative electrode active material of the present embodiment contains at least one of material A and material B, and material C:

Provided is a negative electrode active material that can improve the discharge capacity per volume and/or charge-discharge cycle characteristics. The negative electrode active material according to the present embodiment contains an alloy phase and ceramics. The alloy phase undergoes thermoelastic diffusionless transformation when releasing or occluding metal ions. The ceramics is dispersed in the metal phase. The content of ceramics in the alloy phase is more than 0 to 50 mass % with respect to the total mass of the alloy phase and the ceramics.

An inexpensive negative electrode material for a nonaqueous electrolyte secondary battery includes three types of powder materials: alloy material A; alloy material B; and a conductive material. Alloy material A includes a CoSnstructure containing Co, Sn, and Fe and has an Sn content of at least 70.1 mass % and less than 82.0 mass %. Alloy material B includes CoSnand has a lower discharge capacity than alloy material A. The proportion Rof the mass of alloy material B based on the total mass of alloy material A and B is greater than 5.9% and less than 27.1%. The content of the conductive material is at least 7 mass % and at most 20 mass % based on the total mass of alloy material A and B, and the conductive material. The exotherm starting temperature for the negative electrode material is less than 375.4&#xb0; C.

Growing community of inventors

Nishinomiya, Japan

Sukeyoshi Yamamoto