Abstract: Electrodes and electrochemical capacitors including the same including an electrode active material layer having two layers or more formed on a current collector, wherein the electrode active material layer has a gradient of the specific surface area value to the electric conductivity along a thickness direction of a current collector. Exemplary embodiments manufacture the electrodes having the gradient of the specific surface area value to the electricity conductivity along the thickness direction of the current collector by forming the electrode active material layer having compositions in which a kind of electrode active materials and conductive materials are different along the thickness direction of the current collector. The exemplary embodiments can increase the capacitance of the electrochemical capacitor including the electrode and lower the electric resistance thereof, by appropriately controlling the resistance and capacitance value of the electrode.

Abstract: An electrode active material including a first layer formed on a surface of activated carbon and having a porous structure, and a second layer formed on the first layer and having polar groups, a method for preparing the same, and an electrochemical capacitor including an electrode using the same. There can be provided an electrode active material for an electrochemical capacitor having improved performances in which capacitance per unit weight is large, inner resistance is small, and performance is not largely deteriorated even at high current. Furthermore, high-priced activated carbon mainly dependent on imports can be substituted with low-priced activated carbon prepared by double surface treatment, and thus superior economical effects can be obtained.

Abstract: A method for manufacturing a lithium ion capacitor, and a lithium ion capacitor manufactured using the method are provided. The method for manufacturing a lithium ion capacitor includes: disposing a lithium metal on a capacitor cell including a cathode, a separation film, and an anode; impregnating the capacitor cell with electrolyte including a lithium salt; changing the cathode and the anode to allow lithium ions within the electrolyte to be occluded into the anode; performing a primary reaction in which the cathode and the lithium metal are short-circuited to emit anions from the cathode and lithium ions from the lithium metal and a secondary reaction that the lithium ions emitted from the lithium metal are occluded into the cathode; and recharging the cathode and the anode to allow the lithium ions, which have been occluded into the cathode and the lithium ions within the electrolyte, to be occluded into the anode.

Abstract: An electrode for an electrochemical capacitor including a carbon material that is doped and two types of conductive materials with different particle sizes, and an electrochemical capacitor including the same. The doped carbon material is used as the active material and the two types of conductive materials with different particle sizes are added between the active materials with a relatively large particle size, so that the electrode with high density can be prepared by increasing the amount of active material per unit volume, and can be efficiently used in a low resistance and high output electrochemical capacitor by increasing the filling density of the conductive material with excellent conductivity.

Abstract: A composition for an electrode active material slurry and an electrochemical capacitor including an electrode using the same. The electrochemical capacitor includes: an electrode having a current collector coated with the composition for an electrode active material slurry including an electrode active material, a material including a nonpolar hydrophobic functional group, and a surfactant; a separator; and an organic electrolyte. Additives improving flowability of the electrode active material slurry and wettability to the electrolyte, thereby increase an effective electrode area contacted with the electrolyte and decrease inner resistance of the electrode, with the result that there can be provided an electrochemical capacitor having higher capacitance and lower electrode resistance when the active material and conductive material are added in the same amount.

Abstract: Disclosed herein is an energy storage module, including: upper and lower cases each having elastic bodies provide at both side parts thereof; a capacitor cell inserted within the upper case and the lower case and having anode electrodes and cathode electrodes extended at both side parts thereof; and bus bars inserted between the anode terminals and between the cathode terminals of the capacitor cell. According to the present invention, the module can be manufactured in a comparative simple constitution, and an electric short circuit between anode and cathode terminals can be prevented when swelling occurs due to repetitive charging and discharging of capacitor cells.

Abstract: Disclosed herein are an energy storage case includes: a housing including a reception part in which an energy storage cell and an electrolyte are received; a cover part coupled to the housing and including two through-holes penetrating through both surfaces thereof; a lead connection part including a fusing part to which one end of a current collector of the energy storage cell is fused and a coupling part formed with a first screw part; and an external lead part including a second screw part coupled to the first screw part and a head part having a rectangular shape.

Abstract: Disclosed herein are an electric energy storage apparatus, a voltage equalization module thereof, and a voltage equalization method. There is provided an electric energy storage apparatus, including: a plurality of electric energy storage cells connected in series; voltage sensing units sensing voltage charged in each of the electric energy storage cells, respectively; first bypass discharge units connected to each of the electric energy storage cells in parallel, respectively, and bypassing and discharging electric energy charged; second bypass discharge units additionally connected to each of the electric energy storage cells in parallel, respectively, and bypassing and additionally discharging electric energy; and a control unit receiving voltage information from the voltage sensing units, determining whether controlling or not and controlling operations of each of the first and second bypass discharge units so as to equalize charged voltage values of the electric energy storage cells.

Abstract: Disclosed herein are a lithium plate, a method for lithiation of an electrode, and an energy storage device. According to an exemplary embodiment of the present invention, there is provided a lithium plate used for lithium pre-doping of an electrode for an energy storage device, including: a contact area contacting the electrode at the time of the pre-doping; and a plurality of through holes or a plurality of grooves regularly distributed to be adjacent to the contact area so that an electrolytic solution gains easy access to the vicinity of a contact boundary of the contact area and the electrode at the time of the pre-doping. In addition, a method for lithiation of an electrode for an energy storage device using the above-mentioned lithium plate and an energy storage device including a negative electrode (anode) lithiated according to the method have been proposed.

Abstract: An energy storage device includes a plurality of unit cells stacked therein, each of the unit cells including a cell body, a positive terminal disposed at one side of the cell body, and a negative terminal disposed in the cell body to form a constant rotation angle with the positive terminal with reference to a center of the cell body, wherein the plurality of cell units are stacked in such a manner that another unit cell is rotated as much as the constant rotation angle with reference to one unit cell. Temperature distribution, that is, heat distribution in the energy storage device can be kept even, and heat transmission efficiency between the terminals and the external air can be improved and thus cooling efficiency can be improved. Also, a resistance value is reduced by improving a cooling function so that performance and reliability of a product can be improved.

Abstract: Disclosed herein are a binder composition for manufacturing an electrode of an energy storage device and a method for manufacturing an electrode of an energy storage device. The binder composition includes galactomannan as a major component and may exhibit sufficient binding force with a considerably small amount, as compared to binders in the related art. When the binder composition disclosed herein is used to manufacture an energy storage device having the same weight as that manufactured using the binder in the related art, the energy storage device may contain a greater amount of active material, compared to the binder in the related art. Consequently, beneficial effects such as improvement in an energy density as well as eco-friendly characteristics may be rendered.

Abstract: There are provided an electrolyte for a lithium ion capacitor and a lithium ion capacitor including the same. The electrolyte for a lithium ion capacitor according to the present invention includes: a lithium salt; and a mixing solvent including i) two or more compounds selected from a group consisting of cyclic carbonate compounds, ii) one or more compounds selected from a group consisting of linear carbonate compounds represented by a specified Formula, and iii) one or more compound selected from a group consisting of propionate compound represented by a specified Formula.

Abstract: Disclosed herein is an apparatus for stabilizing voltage of an energy storage in which a plurality of unit cells are connected to each other in series, including: a bypass unit that is connected to the unit cell in parallel; and a controller that detects voltage of the unit cell and controls an operation of the bypass unit according to the detected voltage of the unit cell, wherein the bypass unit bypasses current flowing in the unit cell when the detected voltage of the unit cell is larger than predetermined reference voltage to generate the reusing voltage, whereby the voltage of each unit cell is stably equalized and reuses the voltage provided to the bypass path, thereby performing voltage equalization without loss.

Abstract: Disclosed herein are a method for pre-doping an anode and a lithium ion capacitor storage device including the same. The method of the present invention includes: disposing lithium metal films and anodes alternately; and charging the lithium metal films and the anodes to directly pre-dope lithium metal contained in the lithium metal films onto the anodes. The lithium ion capacitor storage device is manufactured by the method. According to the present invention, the lithium ion capacitor storage device including the anode can provide a high-capacitance capacitor capable of operating even at a high voltage range of up to 3.8V to 2.0V, and ensure high reliability even in a high-temperature (60° C.) cycle.

Abstract: A cathode active material, a method for preparing the same, and a lithium ion capacitor including the same. The cathode active material has a surface with a porous structure and an inside with an amorphous structure where crystalline phases are not present. The cathode active material according to the present invention has the inside having an amorphous structure where crystal lattices are not contained in a short range order, thereby preventing the lithium ions from being intercalated into the inside of the cathode active material while the anode is pre-doped. The lithium ion capacitor containing the cathode active material having the above structure can maintain a potential difference between the cathode and the anode constantly, thereby obtaining high withstand voltage, high energy density, and high input and output characteristics. Furthermore, a large-capacitance lithium ion capacitor device having excellent reliability of high-speed charging and discharging cycle can be manufactured.

Abstract: Disclosed herein is a hybrid capacitor as a super capacitor including a positive electrode, a negative electrode, a separator, and an electrolyte solution, wherein the positive electrode includes a positive electrode active material including a material obtained by mixing a non-porous carbon material and a porous carbon material, and a positive electrode collector.

Abstract: Disclosed herein are an electrolyte solution composition and an energy storage device including the same. The electrolyte solution may include: a solvent including one or more compound selected from one or more cyclic carbonate compound; and additives including one or more selected from a group consisting of catechol carbonate (CC), fluoro ethylene carbonate (FEC), propane sulton (PS), and propene sulton (PST).

Abstract: Disclosed herein is a hybrid capacitor including: a first structure including a cathode containing activated carbon and an anode containing lithium; and a second structure including activated carbon layers formed on both surfaces of a current collector. With the hybrid capacitor, characteristics of an LIC and characteristics of an EDLC are implemented in a single cell, thereby making it possible to increase energy density and improve output characteristics.

Abstract: Disclosed herein are a system for energy storage may include: a unit cell package in which the plurality of unit cells are connected in series and/or in parallel; an input/output terminal connected with the unit cell package to supply energy to the unit cell package or output energy stored in the unit cell package; an interruption switch connected between the unit cell package and the input/output terminal to connect or interrupt the unit cell package and the input/output terminal with and from each other; a slave connected with the plurality of unit cells and/or the unit cell package to monitor voltages of the plurality of unit cells and/or a voltage of the unit cell package; and a master connected with the slave to receive information monitored by the slave and generate a signal for controlling the slave and the interruption switch in accordance with the monitored information.

Abstract: There is provided an exhausting device and an energy storage device, including: a housing; a lower valve; an upper valve; a cover; and an elastic member provided between a lower surface of the cover and an upper surface of the opening/closing member to provide a downward pressure to the opening/closing member, and it can appropriately release an increase in an inside pressure due to gas generated inside an energy storage device by the exhausting device, thereby improving reliability of the energy storage device, extending lifespan of the energy storage device, and allowing semi-permanent use of the energy storage device.