Lithium secondary battery
DCFirst Claim
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1. A lithium secondary battery comprising:
- a negative electrode composed mainly of a carbon material consisting essentially of a graphite having(a) a d-value of the lattice plane (002) obtained by X-ray diffraction thereof of 3,354 to 3,370 and(b) a crystallite size in the c-axis direction obtained by X-ray diffraction thereof of at least 200 Å
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a positive electrode composed mainly of a compound capable of occluding and discharging lithium and which is different from the graphite of the negative electrode;
a separator between said positive electrode and said negative electrode; and
an electrolyte solution of an electrolyte solute dissolved in a solvent, said solvent comprising ethylene carbonate in an amount of 20% to 80% by volume based on the volume of the solvent.
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Abstract
Provided is a novel lithium secondary battery including a positive electrode including a compound capable of occluding and discharging lithium, a negative electrode composed mainly of a carbon material which includes a graphite as an only or as a principal component, a separator between the positive electrode and the negative electrode; and an electrolyte solution of an electrolyte solute dissolved in a solvent including at least one specific cyclic compound.
The lithium secondary battery has a large capacity, small self-discharge rate and excellent cycle characteristics and high charge-discharge efficiency.
44 Citations
41 Claims
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1. A lithium secondary battery comprising:
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a negative electrode composed mainly of a carbon material consisting essentially of a graphite having (a) a d-value of the lattice plane (002) obtained by X-ray diffraction thereof of 3,354 to 3,370 and (b) a crystallite size in the c-axis direction obtained by X-ray diffraction thereof of at least 200 Å
;a positive electrode composed mainly of a compound capable of occluding and discharging lithium and which is different from the graphite of the negative electrode; a separator between said positive electrode and said negative electrode; and an electrolyte solution of an electrolyte solute dissolved in a solvent, said solvent comprising ethylene carbonate in an amount of 20% to 80% by volume based on the volume of the solvent. - View Dependent Claims (2, 3, 4, 5)
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6. A lithium secondary battery comprising:
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a negative electrode composed mainly of a carbon material consisting essentially of a graphite having (a) a d-value of the lattice plane (002) obtained by X-ray diffraction thereof of 3.354 to 3,370, (b) a crystallite size in the c-axis direction obtained by X-ray diffraction thereof of at least 200 Å and (c) an average particle diameter of 1 μ
m to 30 μ
m;a positive electrode composed mainly of a compound capable of occluding and discharging lithium and which is different from the graphite of the negative electrode; a separator between said positive electrode and said negative electrode; and an electrolyte solution of an electrolyte solute dissolved in a solvent, said solvent comprising ethylene carbonate in an amount of 20% to 80% by volume based on the volume of the solvent. - View Dependent Claims (7, 8, 9, 10)
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11. A lithium secondary battery comprising:
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a negative electrode composed mainly of a carbon material consisting essentially of a graphite having (a) a d-value of the lattice plane (002) obtained by X-ray diffraction thereof of 3.354 to 3.370, (b) a crystallite size in the c-axis direction obtained by X-ray diffraction thereof of at least 200 Å and (c) a specific surface area of 0.5 m2 /g to 50 m2 /g; a positive electrode composed mainly of a compound capable of occluding and discharging lithium and which is different from the graphite of the negative electrode; a separator between said positive electrode and said negative electrode; and an electrolyte solution of an electrolyte solute dissolved in a solvent, said solvent comprising ethylene carbonate in an amount of 20% to 80% by volume based on the volume of the solvent. - View Dependent Claims (12, 13, 14, 15)
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16. A lithium secondary battery comprising:
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a negative electrode composed mainly of a carbon material consisting essentially of a graphite having (a) a d-value of the lattice plane (002) obtained by X-ray diffraction thereof of 3.354 to 3,370, (b) a crystallite size in the c-axis direction obtained by X-ray diffraction thereof of at least 200 Å
,(c) an average particle diameter of 1 μ
m to 30 μ
m and(d) a specific surface area of 0.5 m2 /g to 50 m2 /g; a positive electrode composed mainly of a compound capable of occluding and discharging lithium and which is different from the graphite of the negative electrode; a separator between said positive electrode and said negative electrode; and an electrolyte solution of an electrolyte solute dissolved in a solvent, said solvent comprising ethylene carbonate in an amount of 20% to 80% by volume based on the volume of the solvent. - View Dependent Claims (17, 18, 19, 20)
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21. A lithium secondary battery comprising:
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a negative electrode composed mainly of a carbon material consisting essentially of a graphite having (a) a d-value of the lattice plane (002) obtained by X-ray diffraction thereof of 3.354 to 3.370, (b) a crystallite size in the c-axis direction obtained by X-ray diffraction thereof of at least 200 Å
,(c) an average particle diameter of 1 μ
m to 30 μ
m,(d) a specific surface area of 0.5 m2 /g to 50 m2 /g and (e) a true density of 1.9 g/cm3 to 2.25 g/cm3 ; a positive electrode composed mainly of a compound capable of occluding and discharging lithium and which is different from the graphite of the negative electrode; a separator between said positive electrode and said negative electrode; and an electrolyte solution of an electrolyte solute dissolved in a solvent, said solvent comprising ethylene carbonate in an amount of 20% to 80% by volume based on the volume of the solvent. - View Dependent Claims (22, 23, 24, 25, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41)
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26. A lithium secondary battery comprising:
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a negative electrode composed mainly of, a carbon material consisting essentially of a graphite having (a) a d-value of the lattice plane (002) obtained by X-ray diffraction thereof of 3.354 to 3.370, (b) a crystallite size in the c-axis direction obtained by X-ray diffraction thereof of at least 200 Å
,(c) an average particle diameter of 1 μ
m to 30 μ
m,.(d) a specific surface area of 0.5 m2 /g to 50 m2 /g and (e) a true density of 1.9 g/cm3 to 2.25 g/cm3 ; a positive electrode composed mainly of a compound capable of occluding and discharging lithium and which is different from the graphite of the negative electrode; a separator between said positive electrode and said negative electrode; and an electrolyte solution of an electrolyte solute dissolved in a solvent, said solvent consisting essentially of 20% to 80% by volume of ethylene carbonate and 80% to 20% by volume of an least one of dimethyl carbonate and diethyl carbonate. - View Dependent Claims (27, 28)
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Specification