Carbonaceous negative electrode material for nonaqueous secondary battery, process for producing the same, and nonaqueous secondary battery
AssigneeMitsubishi Chemical Corporation
InventorsAkio Kato, Noritoshi Takao, Tomiyuki Kamada
Life of this patent
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Abstract
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.
Claims18
A carbonaceous negative electrode material for nonaqueous secondary batteries including
- (i) not less than 2.times.10.sup.-4 cc/g of pores having a diameter of 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..
A process for producing a carbonaceous negative electrode material for nonaqueous secondary batteries comprising the steps of:
- heating a particulate carbonaceous material having an average particle size of not greater than 100 .mu.m at a temperature of 250 to 650.degree. C. in an inert gas atmosphere;
- and
- then heating at a temperature of 700 to 1500.degree. C. in an inert gas atmosphere.
A process for producing a carbonaceous negative electrode material for nonaqueous secondary batteries comprising the steps of:
- heating a particulate carbonaceous material having an average particle size of not greater than 100 .mu.m at a temperature of 50 to 400.degree. C. in an oxidizing gas atmosphere;
- and
- then heating at a temperature of 700 to 1500.degree. C. in an inert gas atmosphere.
A nonaqueous secondary battery containing, as a negative electrode material, a carbonaceous material comprising:
- (i) not less than 2.times.10.sup.-4 cc/g of pores having a diameter of 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..
A carbonaceous negative electrode material for non-aqueous secondary batteries including
- (i) not less than 2.times.10.sup.-4 cc/g of pores having a diameter of smaller than 8 .ANG. and
- (ii) not more than 15.times.10.sup.-4 cc/g of pores having a diameter of 8 .ANG. to 18 .ANG.,
- the carbonaceous negative electrode material being a product of heating with devolatilization of a raw carbonaceous material selected from the group consisting of coke obtained by coking heavy petroleum fractions, heavy coal fractions, tarry substances obtained by heating polycyclic aromatic compounds, at about 400 to 500.degree. C., and a carbonaceous material obtained by carbonizing phenolic resins, furan resins, wood, bamboo, or coal, at 700.degree. C. or lower.
A process for producing a carbonaceous negative electrode material for non-aqueous secondary batteries comprising the steps of:
- (a) heating a particulate raw carbonaceous material having an average particle size of not greater than 100 .mu.m at a temperature of 50 to 400.degree. C. in an oxidizing gas atmosphere to produce a product having a volatile content of not more than 1%;
- and
- (b) then heating the product of step (a) at a temperature of 700 to 1500.degree. C. in an inert gas atmosphere,
- the raw carbonaceous material being selected from the group consisting of coke obtained by coking heavy petroleum fractions, heavy coal fractions, tarry substances obtained by heating polycyclic aromatic compounds at about 400 to 500.degree. C., and a carbonaceous material obtained by carbonizing phenolic resins, furan resins, wood, bamboo, or coal.
Dependencies are inferred from the claim text.