Mitsubishi Chemical Corporation

Mitsubushi Chemical Corporation

Tomiyuki Kamada

Hideharu Sato

Akio Kato

Noritoshi Takao

Tooru Fuse

Keita Yamaguchi

Manabu Hayashi

Masakazu Yokomizo

Hiroyuki Uono

Tadashi Ishihara

Kengo Okanishi

Hideharu Satou

A negative-electrode material is provided that can be produced at a low cost and yields a lithium secondary battery with an excellent balance of various battery characteristics even when used in high electrode densities. It has a graphite powder with a tap density of 0.80 g/cmor higher and 1.35 g/cmor lower, an amount of surface functional groups, O/C value, of 0 or larger and 0.01 or smaller, a BET specific surface area of 2.5 m/g or larger and 70 m/g or smaller, a Raman R value of 0.02 or larger and 0.05 or smaller.

Negative electrode material for lithium secondary battery, method for producing same, negative electrode for lithium secondary battery using same and lithium secondary battery

A lithium secondary battery with high-output/high-input characteristics which has a long life, and is highly safe contains a negative electrode of a negative-electrode active material. In a dispersion prepared by dispersing 100 g of the active-material powder in 200 g of water together with 2 g of carboxymethyl cellulose, the particle diameter at which particles begin to appear is 50 &#x3bc;m or smaller when the dispersion is examined by the grind gauge method for determining the degree of dispersion in accordance with JIS K5400.

Negative-electrode active material for lithium secondary battery, negative electrode for lithium secondary battery, and lithium secondary battery

A carbonaceous negative electrode material for nonaqueous secondary batteries having (i) not less than 2&times;10 cc/g of pores having a diameter of smaller than 8 &angst; and (ii) not more than 15&times;10 cc/g of pores having a diameter of 8 to 18 &angst;. The material exhibits a high capacity and a high efficiency.

Carbonaceous negative electrode material for nonaqueous secondary battery, process for producing the same, and nonaqueous secondary battery

A carbonaceous negative electrode material for nonaqueous secondary batteries having (i) not less than 2.times.10.sup.-4 cc/g of pores having a diameter smaller than 8 .ANG. and (ii) not more than 15.times.10.sup.-4 cc/g of pores having a diameter of 8 to 18 .ANG.. The material exhibits a high capacity and a high efficiency.

Carbonaceous negative electrode material for nonaqueous secondary

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Inashiki-gun, Japan

Tomiyuki Kamada