Smc Corporation

Mitsubishi Chemical Corporation

Smc Corportion

Hideharu Sato

Takumi Matsumoto

Yoshitada Doi

Shinichi Yoshimura

Takeshi Karibe

Takayuki Murai

Yasushi Uchita

Yoshio Asou

Yoshio Aso

Bunya Hayashi

Shinji Miyazoe

Makoto Ishikawa

Takashi Kameda

Ryushiro Kaneko

Hitoshi Matsumoto

Tomohiro Sato

Keisuke Shimauchi

Keita Yamaguchi

Hiroyuki Uono

Masaru Narita

Minoru Kotato

Hitoshi Suzuki

Shunsuke Yamada

Masakazu Yokomizo

Tomiyuki Kamada

Ryushirou Kaneko

Naoki Watanabe

Taisuke Nose

Masato Aoki

Hitoshi Ota

Masayuki Hangai

Atsuyoshi Inoue

Masaya Sugimoto

Solenoid valve

Electromagnetic valve

A carbon material for nonaqueous-electrolyte secondary-battery negative electrode is provided, which satisfies the followings (1) and (2): (1) the carbon material has an aspect ratio of 10 or less; (2) the amount of CO eliminated from the carbon material during heating to 1,000&#xb0; C., as determined with a temperature programmed decomposition mass spectrometer (TPD-MS), is 2-15 &#x3bc;mol/g.

Carbon material for nonaqueous-electrolyte secondary-battery negative electrode and process for producing the same, negative electrode including the same for nonaqueous secondary battery, and nonaqueous-electrolyte secondary battery

Pinch valve

A mixed carbon material is useful for an electrode of a nonaqueous secondary battery. The material has two component materials: carbon material A and carbon material B. Both materials have high capacity and rapid charge-discharge characteristics. Carbon material A, a multilayer-structure material containing an amorphous carbon covering the surface of a graphitic particle, has particularly excellent charging-discharging properties. Carbon material B has particularly excellent electrical conductivity properties. A battery with an electrode having the mixed carbon material can have both rapid charge-discharge characteristics and high cycle characteristics.

Negative electrode material for nonaqueous electrolyte secondary battery, and nonaqueous electrolyte secondary battery using the same

A negative electrode material for a nonaqueous electrolyte secondary battery, where the negative electrode contains a carbon material A and a carbon material B. Carbon material A is a multilayer-structure carbon material containing a graphitic particle having an amorphous carbon surface covering, where the interplaner spacing of 002 planes, by wide-angle XRD, is 3.37 &#x212b; or less, Lc is 900 &#x212b; or more, the tap density is 0.8 g/cmor more, and the Raman R value is from 0.25 to 0.6. Carbon material B is a graphitic particle where the interplanar spacing of 002 planes, by wide-angle XRD, is 3.37 &#x212b; or less, Lc is 900 &#x212b; or more, the tap density is 0.8 g/cmor more, the Raman R value is from 0.2 to 0.5, and the average degree of circularity, determined by a flow-type particle analyzer, is 0.9 or more.

To provide a carbon material capable of suppressing excessive reactivity with an electrolytic solution and excellent in a rapid charge/discharge characteristics. A carbon material for lithium ion secondary batteries, which satisfies: (i) a tap density&#x2267;0.75 g/cm; (ii) a Raman R value&#x2267;0.23 and a half width of D band &#x394;&#x3bd;&#x3c;45 cm, in which the D band appears in the vicinity of 1,358 cmof the Raman spectrum; and (iii) 4 m/g&#x2266;BET specific surface area (SA)&#x2266;11 m/g.

Negative electrode material for nonaqueous secondary battery

To provide a negative electrode material capable of giving a lithium ion secondary battery that is sufficiently small in the charge/discharge irreversible capacity observed at the initial cycle stage, has excellent high-temperature storage characteristics, and reduced in the gas generation at the initial cycle stage as well as during high-temperature storage. A carbon material for lithium ion secondary battery, wherein the surface functional group amount O/C value represented by the following formula 1 is from 1 to 4% and the sum (Cl/C+S/C) of the surface functional group amount Cl/C value represented by the following formula 2 and the surface functional group amount S/C value represented by the following formula 3 is from 0.05 to 0.5%:O/C value (%)=O atom concentration determined based on the peak area of the spectrum of O1s in X-ray photoelectron spectroscopy (XPS) analysis/C atom concentration determined based on the peak area of the spectrum of C1s in XPS analysis&#xd7;100&#x2003;&#x2003;Formula 1:Cl/C value (%)=Cl atom concentration determined based on the peak area of the spectrum of Cl2p in XPS analysis/C atom concentration determined based on the peak area of the spectrum of C1s in XPS analysis&#xd7;100&#x2003;&#x2003;Formula 2:S/C value (%)=Satom concentration based on the peak area of the peak near 165 eV in the spectrum corresponding to S2p in XPS analysis/C atom concentration determined based on the peak area of the spectrum of C1s in XPS analysis&#xd7;100&#x2003;&#x2003;Formula 3.

Carbon material for lithium ion secondary battery

Growing community of inventors

Ibaraki, Japan

Hideharu Sato