Patent application number | Description | Published |
20090220862 | LITHIUM SECONDARY BATTERY - To provide a lithium secondary battery excellent in the life characteristic and the power density. A lithium secondary battery, comprising: a positive electrode capable of intercalating and deintercalating lithium; and an negative electrode capable of intercalating and deintercalating lithium, wherein the positive electrode contains a manganese-containing positive electrode active material of a spinel structure and an oxide that coats the surface of this positive electrode active material, wherein the oxide contains a metallic element, wherein the metallic element forms a solid solution with the positive electrode active material, and wherein the atomic concentration of the metallic element is approximately 0 at depths of from 50 to 100 nm from an external surface of the negative electrode. | 09-03-2009 |
20090263721 | LITHIUM SECONDARY BATTERY AND PRODUCTION METHOD OF THE SAME - To provide a lithium secondary battery which suppresses a decrease in the charge and discharge efficiency during a battery storage test and which is excellent in maintaining the battery capacity after the storage test. There are disclosed a nonaqueous lithium battery, comprising: a positive electrode active material comprising a lithium-containing oxide capable of inserting and detaching lithium ions; a negative electrode active material comprising a carbon material capable of inserting and detaching lithium ions; and an electrolytic solution containing a lithium ion, wherein the surface of the negative electrode active material after initializing charging is coated with a compound derived from vinylene carbonate, and wherein a weight power density of the lithium battery is no less than 100 Wh/kg, and a method of producing a nonaqueous lithium battery comprising a step of sealing a positive electrode active material, a negative electrode active material, and a nonaqueous electrolytic solution using a sealed container, wherein a predetermined amount of vinylene carbonate is added into the nonaqueous electrolytic solution, and the initializing charging is carried out to form a coating on the surface of the negative electrode active material, the coating being derived from the vinylene carbonate. | 10-22-2009 |
20100028777 | Nonaqueous Electrolyte Secondary Batteries - The present invention is intended to improve load characteristics at the time of charging or discharging by assuring a lithium ion transport pathway in the crystal structure of olivine lithium-containing manganese phosphate. There is used a positive electrode active material which is a composite material comprising a material having an olivine structure and represented by Li | 02-04-2010 |
20100129714 | LITHIUM SECONDARY BATTERY - It is an object of the present invention to provide a lithium secondary battery capable of suppressing the elution of Mn, the lithium secondary batteries being excellent in the cycle life and having a high energy density. A positive electrode material for the lithium secondary battery has a cubic spinel structure (space group Fd3m), and comprises a metal phosphate compound and a cubic metal oxide in a surface of a lithium manganese composite oxide represented by a composition formula LiMn | 05-27-2010 |
20100247986 | POSITIVE ELECTRODE MATERIAL FOR LITHIUM SECONDARY BATTERY, LITHIUM SECONDARY BATTERY, AND SECONDARY BATTERY MODULE USING LITHIUM SECONDARY BATTERY - A lithium secondary battery of excellent high temperature cycle characteristic using, as a positive electrode material, a surface-covering lithium manganese composite oxide capable of stably suppressing the leaching of Mn even at high temperature and high voltage without lowering the electric conductivity, in which the positive electrode material for the lithium secondary battery is a lithium transition metal composite oxide having a hexagonal layered structure and represented by a compositional formula: LiMn | 09-30-2010 |
20100297501 | NEGATIVE ELECTRODE FOR LITHIUM SECONDARY BATTERY, AND LITHIUM SECONDARY BATTERY USING THE SAME - The objects of the present invention are to provide a negative electrode for lithium secondary battery which can simultaneously satisfy high energy density and good charge/discharge cyclic characteristics, and to provide a lithium secondary battery which uses the negative electrode.
| 11-25-2010 |
20110059351 | LITHIUM ION SECONDARY BATTERY - A lithium ion secondary battery comprising a positive electrode plate containing a positive electrode active material, a negative electrode plate containing a negative electrode active material, a separator, an electrolyte, and a battery can for enclosing these, wherein the positive electrode active material comprises manganese spinel and a layer-type lithium manganese oxide, and the electrolyte comprises vinylene carbonate and unsaturated sultone. | 03-10-2011 |
20110195321 | RECHARGEABLE METAL-AIR BATTERY - The present invention is intended to suppress the increase of contact resistance due to dimensional changes at the time of charge and discharge in a rechargeable metal-air battery, thereby improving battery performance and service life. The rechargeable metal-air battery of the present invention includes a negative electrode for storing and releasing metal ions; a positive electrode using oxygen as an active material; and an electrolyte membrane placed between the negative electrode and the positive electrode, and is characterized in that a flexible dimension-absorbing member is disposed on the negative electrode side, wherein the dimension-absorbing member is an elastic body formed of a substance which changes reversibly. | 08-11-2011 |
20110217574 | CATHODE MATERIAL FOR LITHIUM SECONDARY BATTERY, LITHIUM SECONDARY BATTERY, AND SECONDARY BATTERY MODULE USING THE BATTERY - A cathode material for a lithium secondary battery capable of stably suppressing manganese dissolution even under high temperature and voltage conditions is provided. Further, by using the cathode material for a lithium secondary battery, a lithium secondary battery excellent in a charge/discharge cycle profile at a high temperature and a secondary battery module equipped with the battery are provided. The cathode material for a lithium secondary battery comprises a lithium manganese composite oxide and a coating layer formed on the surface of the lithium manganese composite oxide. The coating layer includes an oxide compound or a fluoride compound each containing M (wherein, M is at least one element selected from the group of Mg, Al and Cu), and a phosphorous compound. An atomic density of M at the side of the lithium manganese composite oxide in the coating layer is higher than an atomic density of M at the side of a surface layer of the coating layer facing to the electrolyte. | 09-08-2011 |
20110223476 | NON-AQUEOUS ELECTROLYTE AND LITHIUM SECONDARY BATTERY USING THE SAME - A non-aqueous electrolyte and a lithium secondary battery using the same are provided, which satisfy both flame retardancy and charge-discharge cycle characteristics, and attain a longer lifetime of the battery. A mixture of a chain carbonate, vinylene carbonate, a fluorinated cyclic carbonate and a phosphate ester is used as the non-aqueous electrolyte. It is desirable that the phosphate ester includes trimethyl phosphate and a fluorinated phosphate ester. Further, it is desirable that ethylene carbonate is further contained. | 09-15-2011 |
20110281178 | NONAQUEOUS ELECTROLYTE AND LITHIUM-ION SECONDARY BATTERY USING THEREOF - A nonaqueous electrolyte and a lithium-ion secondary battery using the same, wherein a mixture of a cyclic carbonate, a chain carbonate, a first phosphoric acid ester wherein bonding between carbons is a single bond, and a second phosphoric acid ester wherein bonding between carbons contains a double bond is used as the nonaqueous electrolyte. It is desirable that the first phosphoric acid ester is a trimethyl phosphate. In addition, it is desirable that the second phosphoric acid ester is a dimethylisopropenyl phosphate. | 11-17-2011 |
20130101907 | METAL AIR SECONDARY BATTERY - An object of the invention is to reduce the charging overvoltage by using a positive electrode member which does not contain a carbon material that causes the generation of lithium carbonate (Li | 04-25-2013 |
20130122371 | LITHIUM SECONDARY BATTERY - To provide a lithium secondary battery excellent in the life characteristic and the power density. A lithium secondary battery, comprising: a positive electrode capable of intercalating and deintercalating lithium; and an negative electrode capable of intercalating and deintercalating lithium, wherein the positive electrode contains a manganese-containing positive electrode active material of a spinel structure and an oxide that coats the surface of this positive electrode active material, wherein the oxide contains a metallic element, wherein the metallic element forms a solid solution with the positive electrode active material, and wherein the atomic concentration of the metallic element is approximately 0 at depths of from 50 to 100 nm from an external surface of the negative electrode. | 05-16-2013 |
20130189591 | Lithium-Ion Battery - The present invention aims to improve the fire resistance of an electrolytic solution used for a lithium-ion battery and improve the life characteristics of the lithium-ion battery. In the lithium ion battery of the present invention, specific amounts of ethylene carbonate and dimethyl carbonate are used for a non-aqueous electrolytic solution, and trimethyl phosphate is added thereto. Specifically, the non-aqueous electrolytic solution contains 60 vol % or more of ethylene carbonate (EC) and dimethyl carbonate (DMC). The volume ratio of DMC to the sum of EC and DMC is 0.3 to 0.6, and the non-aqueous electrolytic solution contains 3 to 5 wt % of trimethyl phosphate (TMP) with respect to the total weight of the non-aqueous electrolytic solution. Such a non-aqueous electrolytic solution has an effect of improving the self-fire extinguishing property, and thus improves the safety of the lithium-ion battery. | 07-25-2013 |
20130202957 | Lithium-Ion Rechargeable Battery - Provided is a technique of achieving a longer-life lithium ion secondary battery. The lithium ion secondary battery includes a cathode including a cathode active material containing Mn, an anode including an anode active material containing graphite and non-aqueous electrolytic solution including electrolyte, and LiBF | 08-08-2013 |