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US 5,686,138 AGranted
Lithium secondary battery
AssigneeSanyo Electric Co., Ltd.
InventorsMasahisa Fujimoto, Noriyuki Yoshinaga, Koji Ueno, Nobuhiro Furukawa, Toshiyuki Nohma, Masatoshi Takahashi
Life of this patent
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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.
Claims41
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 .ANG.;
- 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.
4 more elements
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,
- (b) a crystallite size in the c-axis direction obtained by X-ray diffraction thereof of at least 200 .ANG. and
- (c) an average particle diameter of 1 .mu.m to 30 .mu.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.
5 more elements
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,
- (b) a crystallite size in the c-axis direction obtained by X-ray diffraction thereof of at least 200 .ANG. and
- (c) a specific surface area of 0.5 m.sup.2 /g to 50 m.sup.2 /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.
5 more elements
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,
- (b) a crystallite size in the c-axis direction obtained by X-ray diffraction thereof of at least 200 .ANG.,
- (c) an average particle diameter of 1 .mu.m to 30 .mu.m and
- (d) a specific surface area of 0.5 m.sup.2 /g to 50 m.sup.2 /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.
6 more elements
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,
- (b) a crystallite size in the c-axis direction obtained by X-ray diffraction thereof of at least 200 .ANG.,
- (c) an average particle diameter of 1 .mu.m to 30 .mu.m,
- (d) a specific surface area of 0.5 m.sup.2 /g to 50 m.sup.2 /g and
- (e) a true density of 1.9 g/cm.sup.3 to 2.25 g/cm.sup.3 ;
- 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.
7 more elements
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,
- (b) a crystallite size in the c-axis direction obtained by X-ray diffraction thereof of at least 200 .ANG.,
- (c) an average particle diameter of 1 .mu.m to 30 .mu.m,.
- (d) a specific surface area of 0.5 m.sup.2 /g to 50 m.sup.2 /g and
- (e) a true density of 1.9 g/cm.sup.3 to 2.25 g/cm.sup.3 ;
- 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.
7 more elements
Dependencies are inferred from the claim text.