Abstract: A method of pre-lithiating a negative electrode for a secondary battery, including: dispersing a lithium metal powder, an inorganic material powder and a binder in a solvent to prepare a mixed solution; and applying the mixed solution to the negative electrode to form a lithium metal-inorganic composite layer on the negative electrode, thereby forming the pre-lithiated negative electrode. Also, a method for pre-lithiating a negative electrode having a high capacity by a simple process. Further, a negative electrode for a secondary battery manufactured through the pre-lithiation method provided in the present invention has an improved initial irreversibility, and secondary batteries manufactured using such a negative electrode for a secondary battery have excellent charge/discharge efficiency.

Abstract: A negative electrode for a lithium secondary battery, which includes a negative electrode active material layer formed on a negative electrode collector, and a coating layer formed on the negative electrode active material layer and which includes lithium metal and metal oxide, a lithium secondary battery including the same, and a method of preparing the negative electrode.

Abstract: A method for pre-lithiating a silicon oxide negative electrode for a secondary battery, specifically a method for pre-lithiation by immersing the silicon oxide negative electrode in an electrolytic solution for wetting, and by applying pressure while a lithium metal is in direct contact with the wetted silicon oxide negative electrode. The silicon oxide negative electrode for a secondary battery manufactured through pre-lithiation provided in the present disclosure has improved initial irreversibility, and a secondary battery manufactured using such a silicon oxide negative electrode for a secondary battery has excellent charge/discharge efficiency.

Abstract: TA negative electrode, a secondary battery including the same, and a method of preparing the negative electrode are provided. The negative electrode, which includes a current collector; a negative electrode active material layer disposed on the current collector; a first layer disposed on the negative electrode active material layer and including Li; and a second layer disposed on the first layer and including an inorganic material is provided. A loading amount of the first layer may satisfy Equation 1: 0.65×(x1?y1)<loading amount of the first layer<0.95×(x1?y1).

Abstract: Provided are an electrode capable of maintaining electrical conductivity during elongation and shrinkage, a method for manufacturing the same, and electrochemical device including the same.

Abstract: A method of charging a secondary battery, including first, second and third charging sections in which a CC-charging performed as first, second, and third C-rate (C1, C2, C3), respectively, is supplied until the voltage of the secondary battery reaches a respective first, second and third charging cutoff voltage (V1), (V2), (V3) and a CV-charging is performed as the respective charging C-rate gradually decreases in response to reaching the respective charging cutoff voltage (V1), (V2), (V3), wherein the charging cutoff voltage satisfies the V1=n?(0.25˜0.15), V2=n?(0.2˜0.1), and V3=n (here, ‘n’ is an electric potential at the full charge of the secondary battery), and V1<V2<V3, and the ratio of the first C-rate (C1):the second C-rate (C2):the third C-rate (C3) satisfies following condition (1): C1:C2:C3=3.8˜4.2:2.8˜3.2:0.8˜1.2 (1).

Abstract: The present disclosure relates to a secondary graphite particle comprising an initial natural graphite particle of excellent high capacity and output characteristic, aggregated, bonded or assembled with an initial artificial graphite particle of excellent cycle characteristic and swelling characteristic, thus having superior rollability that leads into increased density, a negative electrode using the secondary graphite particle as a negative electrode active material, and a secondary lithium battery comprising the negative electrode. Accordingly, the secondary lithium battery comprising the secondary graphite particle as described above as the negative electrode active material has an effect of enhanced high rate charging and discharging capability, cycle characteristic and swelling characteristic.

Abstract: The present invention relates to a method of manufacturing an electrode laminate and to a flexible and stretchable electrode laminate manufactured using the same. The method includes (a) printing a conductive print ink including a metal precursor, an organic solvent, and a polymer on a flexible substrate to thus form a conductive print ink pattern impregnated into the flexible substrate, and (b) reducing the conductive print ink pattern to thus manufacture the electrode laminate. The present invention provides a method of manufacturing a flexible and stretchable electrode laminate which is simpler and which consumes less time than a conventional manufacturing method.

Abstract: A negative active material for rechargeable lithium secondary batteries, a method of preparing the same, and a rechargeable lithium secondary battery including the same are disclosed. The negative active material includes a core including a lithium titanium oxide of Formula 1, and a coating layer positioned on a surface of the core and including an acid anhydride physisorbed onto the core, and thus can be useful in inhibiting battery side reactions and gas generation and improving battery performance since moisture formed during a redox reaction is effectively absorbed into a surface of the negative active material. LixTiyO4??[Formula 1] In Formula 1, x and y are as defined in the detailed description.

Abstract: The present invention relates to a method of manufacturing a negative electrode and a negative electrode manufactured using the method. According to the present invention, negative electrode samples are fabricated to have different electrode densities, and then, in a negative electrode expansion curve of each negative electrode sample according to the 1st charging, when a change in slopes of tangents to the negative electrode expansion curve at an initial state of charge (SOC) of less than 50%, at which the expansion curve increases, satisfies a particular value, a secondary battery manufactured including a negative electrode having the electrode density may exhibit excellent lifespan characteristics and excellent initial efficiency for the corresponding active material.

Abstract: Disclosed are a negative electrode active material for lithium secondary batteries, a method of preparing the same and a lithium secondary battery including the same. More particularly, the negative electrode active material includes a core that includes a lithium titanium oxide represented by Formula 1 below and a coating layer that is located in a surface of the core and includes fluorine, and thus, a moisture content in the active material is decreased and adsorption of outside moisture is inhibited, thereby removing concern for side reaction occurrence due to moisture. In addition, loss of an SEI layer may be prevented due to a stable fluorine-containing coating layer formed on a surface of the active material. As a result, battery performance may be enhanced and stable expression thereof is possible: LixTiyO4,??[Formula 1] wherein x and y are the same as defined in the present specification.

Abstract: Provided are an electrode capable of maintaining electrical conductivity during elongation and shrinkage, a method for manufacturing the same, and electrochemical device including the same.

Abstract: A method and an apparatus are provided for reducing a delay in a wireless communication system supporting a broadcast service. A message including last timestamp information is received from one or more eNBs in a broadcast service area. An eNB is determined that has received a packet with a longest delay, among the one or more eNBs based on the last timestamp information. A new offset of a system frame number is determined using the last timestamp information of the eNB. The new offset of the system frame number is transmitted to the one or more eNBs.

Abstract: Disclosed are a negative electrode active material for lithium secondary batteries, a method of preparing the same and a lithium secondary battery including the same. More particularly, the negative electrode active material includes a core that includes a lithium titanium oxide represented by Formula 1 below and a coating layer that is located in a surface of the core and includes fluorine, and thus, a moisture content in the active material is decreased and adsorption of outside moisture is inhibited, thereby removing concern for side reaction occurrence due to moisture. In addition, loss of an SEI layer may be prevented due to a stable fluorine-containing coating layer formed on a surface of the active material. As a result, battery performance may be enhanced and stable expression thereof is possible: LixTiyO4,??[Formula 1] wherein x and y are the same as defined in the present specification.

Abstract: A negative active material for rechargeable lithium secondary batteries, a method of preparing the same, and a rechargeable lithium secondary battery including the same are disclosed. The negative active material includes a core including a lithium titanium oxide of Formula 1, and a coating layer positioned on a surface of the core and including an acid anhydride physisorbed onto the core, and thus can be useful in inhibiting battery side reactions and gas generation and improving battery performance since moisture formed during a redox reaction is effectively absorbed into a surface of the negative active material. LixTiyO4??[Formula 1] In Formula 1, x and y are as defined in the detailed description.

Abstract: The present disclosure relates to a secondary graphite particle comprising an initial natural graphite particle of excellent high capacity and output characteristic, aggregated, bonded or assembled with an initial artificial graphite particle of excellent cycle characteristic and swelling characteristic, thus having superior rollability that leads into increased density, a negative electrode using the secondary graphite particle as a negative electrode active material, and a secondary lithium battery comprising the negative electrode. Accordingly, the secondary lithium battery comprising the secondary graphite particle as described above as the negative electrode active material has an effect of enhanced high rate charging and discharging capability, cycle characteristic and swelling characteristic.

Abstract: A method and an apparatus are provided for reducing a delay in a wireless communication system supporting a broadcast service. A message including last timestamp information is received from one or more eNBs in a broadcast service area. An eNB is determined that has received a packet with a longest delay, among the one or more eNBs based on the last timestamp information. A new offset of a system frame number is determined using the last timestamp information of the eNB. The new offset of the system frame number is transmitted to the one or more eNBs.

Abstract: The present invention relates to a subscriber station security-related parameter negotiation method in a wireless portable Internet system. The subscriber station security-related parameter negotiation method includes security-related parameters in transmitting/receiving basic capability negotiation request messages and basic capability negotiation response messages such that the subscriber station and the base station negotiate the subscriber station security-related parameters. The security-related parameters include an authorization policy support subfield used to negotiate an authorization policy between the subscriber station and the base station, and message authentication code mode subfields used to negotiate a message authentication code mode.

Abstract: A method and apparatus for performing a multiple Pre-Shared Key (PSK) based authentication in a single procedure is described, where the multiple PSK based authentication generates a combined credential in a terminal by using a plurality of credentials including a user identifier and the PSK, and authenticates the terminal in an authentication server by using the combined credential.

Abstract: A system and method for fast network re-entry in a broadband wireless access communication system. A mobile station transmits a first message requiring fast network re-entry to a base station and performs the fast network re-entry together with the base station when receiving a second message approving the fast network re-entry from the base station. The base station receives the first message, authenticates the first message using final session information of the mobile station that is previously stored in the base station, transmits the second message to the mobile station when succeeding in authentication of the first message, and performs the fast network re-entry together with the mobile station.