Patent application number | Description | Published |
20110070504 | SECONDARY BATTERY - This invention relates to a highly safe secondary battery. In the secondary battery of this invention, a positive electrode is formed of an oxide which adsorbs/desorbs lithium ions; a negative electrode is formed of a carbon material which adsorbs/desorbs lithium ions; and an electrolyte solution is formed of an ion liquid and a phosphoric acid ester derivative. Consequently, the secondary battery can be highly safe. Since a phosphate ester and an ion liquid are contained at the same time, high discharge capacity can be maintained even when the phosphate ester is used at a high concentration. | 03-24-2011 |
20110159379 | SECONDARY BATTERY - An object of this invention is to provide a highly safe secondary battery employing a non-flammable electrolyte solution. The secondary battery has a positive pole comprising an oxide for storing and releasing lithium ions, a negative pole comprising a carbon material for storing and releasing lithium ions, and an electrolyte solution. The electrolyte solution comprises 1.5 mol/L or more of a lithium salt, or 1.0 mol/L or more of a lithium salt and 20% by volume or more of a phosphate ester derivative. | 06-30-2011 |
20110274982 | LITHIUM ION BATTERY - There is provided a lithium ion battery which maintains the flame retardancy of an electrolyte over a long period of time, has high energy density, and has improved charge/discharge cycle characteristics, high temperature storage characteristics, and rate characteristics. The lithium ion battery according to the present exemplary embodiment is a lithium ion battery comprising an electrolyte containing at least an ionic liquid and a lithium salt, a positive electrode, and a negative electrode, wherein the negative electrode includes a negative electrode active material which is a carbon material treated with a surface treatment agent. | 11-10-2011 |
20130065136 | LITHIUM ION SECONDARY BATTERY - A lithium ion secondary battery which meets the requirement [1] of satisfying the formulae (a) to (c) or the requirement [2] of satisfying the formulae (b), (d), and (e): (a) 5≦A≦25, (b) 10≦B≦60, (c) 40≦2A+B≦90, (d) 0.2≦C≦1.2, and (e) −80 200C<3B≦150, wherein A (μm) represents an average particle size of a positive electrode active material; B (vol. %) represents a volume concentration of a fluorinated ether in a nonaqueous electrolyte solution; and C (m | 03-14-2013 |
20130230779 | GEL ELECTROLYTE FOR LITHIUM ION SECONDARY BATTERY, AND LITHIUM ION SECONDARY BATTERY - An object of the present invention is to provide a gel electrolyte for a lithium ion secondary battery having flame retardancy over a long period and a good capacity maintenance rate. The gel electrolyte for a lithium ion secondary battery according to the exemplary embodiment contains a lithium salt, a copolymer of at least one first monomer selected from compounds represented by chemical formulae (1) and (2) and a second monomer represented by chemical formula (4), at least one oxo-acid ester derivative of phosphorus selected from compounds represented by chemical formulae (5) to (7), and at least one disulfonate ester selected from a cyclic-chain type disulfonate ester represented by chemical formula (8) and a linear-chain type disulfonate ester represented by chemical formula (9). | 09-05-2013 |
20130266847 | LITHIUM SECONDARY BATTERY - The object of an exemplary embodiment of the invention is to provide a lithium secondary battery which has high energy density by containing a positive electrode active substance operating at a potential of 4.5 V or higher with respect to lithium and which has excellent cycle property. An exemplary embodiment of the invention is an lithium secondary battery, which comprises a positive electrode comprising a positive electrode active substance and an electrolyte liquid comprising a nonaqueous electrolyte solvent; wherein the positive electrode active substance operates at a potential of 4.5 V or higher with respect to lithium; and wherein the nonaqueous electrolyte solvent comprises a fluorine-containing phosphate represented by a prescribed formula. | 10-10-2013 |
20130295465 | LITHIUM ION BATTERY - There is provided a lithium ion battery having high flame retardancy and good cycle characteristics on a long-term basis. The lithium ion battery according to this exemplary embodiment is a lithium ion battery comprising a nonaqueous electrolytic solution or gel electrolyte containing a Li salt and an oxoacid ester derivative of phosphoric acid; a group of stacked electrode in which positive electrodes comprising a positive electrode layer comprising a positive electrode active material disposed on at least one surface of a positive electrode current collector, and negative electrodes comprising a negative electrode layer comprising a negative electrode active material disposed on at least one surface of a negative electrode current collector are alternately stacked via separators; and a package containing the nonaqueous electrolytic solution or gel electrolyte and the group of stacked electrode, wherein both of two electrodes A disposed on outermost sides of the group of stacked electrode, respectively, satisfy 0≦(Wc/Wb)≦0.55 when a mass of an electrode active material contained in an electrode active material-coated layer B disposed on a group-of-stacked-electrodes side of an electrode current collector is Wb, and a mass of an electrode active material contained in an electrode active material-coated layer C disposed on a package side of the electrode current collector is Wc. | 11-07-2013 |
20150263381 | POLYMER GEL ELECTROLYTE, LITHIUM ION BATTERY AND METHOD FOR PRODUCING SAME - A polymer gel electrolyte containing at least a lithium salt and an aprotic solvent, in which an amorphous polymer layer is formed on the surface of an electrode active material. | 09-17-2015 |