Mitsubishi Chemical Corporation

Shunsuke Yamada

Hideaki Tanaka

Hideharu Sato

Akio Ueda

Nobuyuki Ishiwatari

Tooru Fuse

Naoto Maru

Iwao Soga

Takashi Kameda

Koichi Nishio

Shingo Morokuma

Satoshi Akasaka

Daigo Nagayama

Hiromitsu Ikeda

Atsushi Watarai

Keita Yamaguchi

Koji Fukamizu

Masakazu Yokomizo

Hisako Kondo

Akihiro Katou

Taisuke Nose

A carbon material may include granulated particles satisfying (1L) and (2L):

Carbon material, method for producing carbon material, and non-aqueous secondary battery using carbon material

A negative electrode material for nonaqueous secondary batteries, the negative electrode material comprising carbonaceous particles (A) and silicon oxide particles (B), the carbonaceous particles (A) having a 10%-particle size displacement pressure of 10 MPa or less, the 10%-particle size displacement pressure being measured using a micro-compression testing machine by a specific measuring method, the silicon oxide particles (B) having a median diameter (D50) of 0.8 μm or more and 20 μm or less. It is preferred that the content of the silicon oxide particles (B) is less than 30% by weight of a total content of the carbonaceous particles (A) and the silicon oxide particles (B).

Negative electrode material for nonaqueous secondary batteries, negative electrode for nonaqueous secondary batteries, and nonaqueous secondary battery

Provided are: a negative electrode material for nonaqueous secondary batteries, which can yield a high-capacity nonaqueous secondary battery having excellent discharge rate characteristics; and a negative electrode for nonaqueous secondary batteries and a nonaqueous secondary battery. Also provided is a nonaqueous secondary battery having excellent charge-discharge efficiency. The negative electrode material for nonaqueous secondary batteries includes carbonaceous particles (A) and silicon oxide particles (B), and satisfies the followings: a) the average particle size (50% cumulative particle size from the smaller particle side; d50) is 3 μm to 30 μm, and the 10% cumulative particle size from the smaller particle side (d10) is 0.1 μm to 10 μm; b) the ratio (R1=d90/d10) between the 90% cumulative particle size from the smaller particle side (d90) and the d10 is 3 to 20; and c) the ratio (R2=d50/d10) between the d50 and the d10 is 1.7 to 5.

A carbon material for a non-aqueous secondary battery containing a graphite capable of occluding and releasing lithium ions, and having a cumulative pore volume at pore diameters in a range of 0.01 μm to 1 μm of 0.08 mL/g or more, a roundness, as determined by flow-type particle image analysis, of 0.88 or greater, and a pore diameter to particle diameter ratio (PD/d50 (%)) of 1.8 or less, the ratio being given by equation (1A): PD/d50 (%)=mode pore diameter (PD) in a pore diameter range of 0.01 μm to 1 μm in a pore distribution determined by mercury intrusion/volume-based average particle diameter (d50)×100 is provided.

Provided are: a negative electrode material for nonaqueous secondary batteries, which has a high capacity and exhibits excellent low-temperature input-output characteristics, charge-discharge rate characteristics, cycle characteristics, and the like; and a negative electrode for nonaqueous secondary batteries and a nonaqueous secondary battery, which include the negative electrode material. The negative electrode material for nonaqueous secondary batteries includes silicon oxide particles (A) and a carbon material (B), wherein the silicon oxide particles (A) contain zero-valent silicon atoms, and the carbon material (B) has a volume resistivity of less than 0.14 &#x3a9;&#xb7;cm at a powder density of 1.1 g/cm.

Negative electrode material for nonaqueous secondary battery, negative electrode for nonaqueous secondary battery, and nonaqueous secondary battery

An objet of the invention is to provide a non-aqueous electrolyte secondary battery superior in input-output characteristics even at a low temperature. To achieve the object, hybrid particles (carbon material) satisfying certain conditions, and composed of graphite particles and carbon particles with a primary particle size from 3 nm to 500 nm, preferably as well as amorphous carbon, are used as a negative electrode active material for a non-aqueous electrolyte secondary battery, so that the input-output characteristics of a non-aqueous electrolyte secondary battery at a low temperature can be improved remarkably.

Carbon material for non-aqueous electrolyte secondary battery, negative electrode for non-aqueous electrolyte secondary battery, non-aqueous electrolyte secondary battery, and manufacturing method for carbon material for non-aqueous electrolyte secondary battery

This invention aims to provide a carbon material for a nonaqueous secondary battery having a high capacity and excellent charging/discharging load characteristics, which is used as a negative electrode material for a nonaqueous secondary battery. This invention relates to a carbon material for a nonaqueous secondary battery, which has a specific (1) Raman R value, (2) N atom concentration/C atom concentration ratio, and (3) S atom concentration/C atom concentration ratio.

Carbon material for nonaqueous secondary battery, negative electrode using carbon material and 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.

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Ibaraki, Japan

Shunsuke Yamada