Patent application number | Description | Published |
20120091403 | LITHIUM ION RECHARGEABLE BATTERIES & THE ADDITIVE FOR LITHIUM ION RECHARGEABLE BATTERIES WHICH PREVENTS INCREASE OF THE VISCOSITY - The preparation of a slurry so as to exhibit no strong alkalinity not only needs a strict pH control, but also needs once dispersing a positive electrode material in water and the operation of drying after the treatment, and other operations, thereby leading to the complication of the operations and a decrease in the yield. In consideration of the above-mentioned problems, the present invention provides a method for producing a positive electrode plate for a lithium ion rechargeable battery, which exhibits less complication of the operations and less decrease in the yield and can prevent the gelation of a positive electrode material slurry. The above-mentioned problems can be solved by a positive electrode for a lithium ion rechargeable battery containing a positive electrode active material capable of absorbing/desorbing lithium ions, a nitrile group-containing polymer, and a binder. | 04-19-2012 |
20120121947 | LITHIUM SECONDARY BATTERY - To provide a functional material which forms a high-resistance layer to interrupt an electric current, thereby ensuring the safety of a battery during overcharge. | 05-17-2012 |
20120141846 | LITHIUM SECONDARY BATTERY - In a lithium secondary battery which contains an electrode group including a positive electrode, a negative electrode and a separator interposed between the positive electrode and the negative electrode, and an electrolytic solution, a current shut-off portion which is activated by an increase in an internal pressure is provided, a polymerizable compound having an aromatic functional group and a polymerizable functional group, or a polymer having an aromatic functional group and a residue of a polymerizable functional group is contained, and a carbon dioxide generating agent which produces carbon dioxide by a neutralization reaction is contained in at least one of the positive electrode and the separator. Thereby, the current shut-off valve is activated in an early stage of overcharge to increase the safety of the battery when overcharged. | 06-07-2012 |
20120142880 | LITHIUM SECONDARY BATTERY - In a lithium secondary battery, an overcharge inhibitor is used which includes polymerizable compounds or a polymer, or both as an active component, the polymerizable compounds including a first polymerizable compound having an aromatic functional group and a polymerizable functional group, and a second polymerizable compound having a halogen-containing functional group and a polymerizable functional group, and the polymer including a polymer having the halogen-containing functional group, the aromatic functional group, and residues of the polymerizable functional groups. The present invention allows the lithium secondary battery to form a radical-trapping polymer layer on the cathode upon overcharge. | 06-07-2012 |
20120177980 | LITHIUM SECONDARY BATTERY - The gas generation and the decrease in battery capacity during high temperature storage of a lithium secondary battery are suppressed. The electrolyte contains a polymerizable compound or a polymer, the polymerizable compound contains a compound having an aromatic functional group and a polymerizable functional group and a compound having a complex-forming functional group forming a complex with a metal ion and a polymerizable functional group, and the polymer has the complex-forming functional group, the aromatic functional group and a residue of the polymerizable functional group. | 07-12-2012 |