Power storage device
AssigneeSemiconductor Energy Laboratory Co., Ltd.
InventorsMikio Yukawa, Tamae Moriwaka
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Abstract
A power storage device with favorable battery characteristics and a manufacturing method thereof are provided. The power storage device includes at least a positive electrode and a negative electrode provided so as to face the positive electrode with an electrolyte provided therebetween. The positive electrode includes a collector and a film containing an active material over the collector. The film containing the active material contains LieFefPgOh satisfying relations 3.5≦h/g≦4.5, 0.6≦g/f≦1.1, and 0≦e/f≦1.3 and LiaFebPcOd satisfying relations 3.5≦d/c≦4.5, 0.6≦c/b≦1.8, and 0.7≦a/b≦2.8. The film containing the active material contains the LiaFebPcOd satisfying the relations 3.5≦d/c≦4.5, 0.6≦c/b≦1.8, and 0.7≦a/b≦2.8 in a region which is in contact with the electrolyte.
Claims18
A power storage device comprising:
- a negative electrode;
- and
- a positive electrode facing the negative electrode with an electrolyte provided therebetween,
- wherein the positive electrode comprises a collector and a film containing an active material formed over the collector,
- wherein the film is in contact with the electrolyte,
- wherein the film has a stacked structure including a first layer and a second layer which comprise a first active material and a second active material, respectively,
- wherein the first active material has a composition of LieFefPgOh satisfying relations 3.5≦h/g≦4.5, 0.6≦g/f≦1.1, and 0≦e/f≦1.3, and
- wherein the second active material has a composition of LiaFebPcOd satisfying relations 3.5≦d/c≦4.5, 0.6≦c/b≦1.8, and 0.7≦a/b≦2.8.
A power storage device comprising:
- a negative electrode;
- and
- a positive electrode facing the negative electrode with an electrolyte provided therebetween,
- wherein the positive electrode comprises:
- a collector;
- a first film over the collector, the first film containing a first active material;
- and
- a second film over the first film and in contact with the electrolyte, the second film containing a second active material,
- wherein the first active material is lithium iron phosphate containing Fe(II), and
- wherein the second active material is lithium iron phosphate containing Fe(III).
Dependencies are inferred from the claim text.