Nonaqueous electrolyte secondary battery, carbon material for negative electrode, and method for manufacturing carbon material for negative electrode
AssigneeKabushiki Kaisha Toshiba
InventorsTomokazu Morita, Takahisa Ohsaki, Norio Takami
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Abstract
The present invention provides a nonaqueous electrolyte secondary battery, comprising a positive electrode, a negative electrode containing a carbon material having an immersion heat ratio (ΔHin/ΔHih) defined by formula (1), and a nonaqueous electrolyte: 1.2≦ΔHin/ΔHih≦b (1) where ΔHih denotes the immersion heat for n-heptane of the carbon material, and ΔHin denotes the immersion heat for 1-nitropropane of the carbon material.
Claims23
A nonaqueous electrolyte secondary battery, comprising:
- a positive electrode;
- a negative electrode containing a carbon material having an immersion heat ratio (ΔHin/ΔHih) defined by formula (1);
- and
- a nonaqueous electrolyte:
- 1.2≦ΔHin/ΔHih≦2 (1)
- where ΔHih denotes the immersion heat for n-heptane of the carbon material, and ΔHin denotes the immersion heat for 1-nitropropane of the carbon material.
A carbon material for a negative electrode, having an immersion heat ratio (ΔHin/ΔHih) defined by formula (1):
- 1.2≦ΔHin/ΔHih≦2 (1)
- where ΔHih denotes the immersion heat for n-heptane of the carbon material, and ΔHin denotes the immersion heat for 1-nitropropane of the carbon material.
A method of manufacturing a carbon material for a negative electrode, comprising the step of applying a heat treatment to a carbonaceous material containing at least one material selected from the group comprising a carbonized material and a graphitized material under a gaseous atmosphere selected from the group consisting of a first gaseous atmosphere containing at least 10% by volume of CO2, a second gaseous atmosphere containing at least 1% by volume of H2O, and a third gaseous atmosphere containing at least 10% by volume of CO2 and at least 1% by volume of H2O.
A method of manufacturing a carbon material for a negative electrode, comprising the step of:
- applying a heat treatment to a carbonaceous material containing at least material selected from the group comprising the carbonized material and the graphitized material under a gaseous atmosphere selected from the group consisting of a first gaseous atmosphere containing at least 10% by volume of CO2, a second gaseous atmosphere containing at least 1% by volume of H2O and a third gaseous atmosphere containing at least 10% by volume of CO2 and at least 1% by volume of H2O;
- and
- bringing said carbonaceous material into contact with a gaseous acid.
A method of manufacturing a carbon material for a negative electrode, comprising the step of applying a heat treatment to a carbon precursor under a gaseous atmosphere selected from the group consisting of a first gaseous atmosphere containing at least 10% by volume of CO2, a second gaseous atmosphere containing at least 1% by volume of H2O, and a third gaseous atmosphere containing at least 10% by volume of CO2 and at least 1% by volume of H2O so as to carbonize or graphitize the carbon precursor.
A method of manufacturing a carbon material for a negative electrode, comprising the step of:
- applying a heat treatment to a carbon precursor under a gaseous atmosphere selected from the group consisting of a first gaseous atmosphere containing at least 10% by volume of CO2, a second gaseous atmosphere containing at least 1% by volume of H2O and a third gaseous atmosphere containing at least 10% by volume of CO2 and at least 1% by volume of H2O so as to carbonize or graphitize said carbon precursor;
- and
- bringing said carbon precursor into contact with a gaseous acid.
A method of manufacturing a carbon material for a negative electrode, comprising the step of applying a heat treatment to a carbonaceous material containing at least material selected from the group comprising a carbonized material and a graphitized material under an atmosphere containing at least one of a gas of an inorganic acid and a gas of an organic acid.
Dependencies are inferred from the claim text.