 Magnetooptical recording medium and method of producing the same |
| An objective of the present invention is to provide a magnetooptical recording medium which has a ... |
|
| Voltage monitor and control circuit |
| Having described what is new and novel and desired to secure by Letters Patent, What is claimed is: ... |
|
| DC-DC converter with surge voltage prevention |
| Therefore, an object of the present invention is to solve the above disadvantages of the prior art ... |
|
| Synchronous rectification type converter |
| It is an object of the present invention to provide a synchronous rectifier circuit capable of ... |
|
| Adhesive bonding of scatter coated metal objects |
| The present invention solves the above-mentioned drawbacks of the conventional methods, by ... |
|
| Circuit arrangement for supplying a load |
| It is an object of the invention to provide a circuit arrangement which with simple means ensures ... |
|
| High voltage start-up circuit and method therefor |
| In accordance with one embodiment of the present invention, it is an object of this invention to ... |
|
| Power factor corrected electrical power converter |
| Broadly stated, the present invention encompasses a power factor corrected electrical power ... |
|
| Detection of DC content in an AC waveform |
| According to the present invention, the DC content of an AC waveform is determined by measuring and ... |
|
|
Lithium secondary battery
| Details |
Inventors: Kamauchi, Masahiro; Soejima, Hiroshi; Kubota, Shuji; Sasaki, Kouzou;
Assignee: Mitsubishi Cable Industries, Ltd. (Amagasaki, JP)
Primary Examiner: Willis, Jr.; Prince
Assistant Examiner: Nuzzolillo; M.
Attorney, Agent or Firm: Varndell Legal Group
A lithium secondary battery comprising a positive electrode composed of a positive electrode active material comprising at least one member selected from the group consisting of lithium phosphate, lithium-cobalt phosphate, cobalt oxide, and lithium-cobalt oxide, such that the molar ratio of cobalt:phosphorus: lithium is more than 0.1:more than 0.2:1, a negative electrode, and an electrolyte. The lithium secondary battery of the invention has high energy density leading to high discharge capacity, high electromotive force, and high discharge voltage, and excellent cycle properties. |
|
DETAILED DESCRIPTION One object of the invention is to provide an improved lithium secondary battery comprising a positive electrode active material of high energy density, which can solve the above-mentioned problems.
Another object of the invention is to provide a lithium secondary battery comprising a positive electrode active material of high energy density, which has high energy density leading to high discharge capacity, high electromotive force, and high discharge voltage, and excellent cycle properties.
A lithium negative electrode has lowest potential, small atomic weight, and high capacity.
It is thus important for a lithium secondary battery with high energy density to make a positive electrode have high potential and high capacity.
Since the capacity of a positive electrode of a lithium battery is naturally determined by the formula weight of a compound reactive with 1 molar lithium, it is important to make the positive electrode have high potential.
The potential of an electrode is theoretically determined by free energy, and the energy difference between a negative electrode and a positive electrode represents the electromotive force of a battery.
Thermodynamic data in a simpler system like lithium or zinc has been obtained, whereas sufficient thermodynamic data on oxides or chalcogenides to be used as a positive electrode of lithium secondary battery has not been collected.
When searching a high potential positive electrode, the inventors studied the relationship between cationic radius and potential in oxides to be used as a positive electrode active material of lithium secondary battery, and found a tendency of higher potential with smaller cationic radius.
In particular, the inventors have found that, of the materials having smaller ionic radius, phosphorus has properties essentially suitable for a positive electrode active material, and that a phosphorous-containing positive electrode active material gives lithium secondary battery high potential and high energy density
|
|
Fuel Cells 
