Abstract: Provided is a cooking appliance configured to maintain heat retention of contents. The cooking appliance is configured to, when entering a heat retention mode, compare a temperature of the contents measured via a temperature sensor with a target heat retention temperature, and when the temperature of the contents is equal to or greater than the target heat retention temperature, transmit power control information to a wireless power transmission device, the power control information indicating to suspend transmission of first power and then to re-transmit the first power after an elapse of a preset time.

Abstract: A method, performed by a wireless power transmission apparatus, of performing a cooking operation, includes: detecting a cooking appliance, establishing a communication connection with the detected cooking appliance, obtaining operation history information corresponding to the cooking appliance, and transmitting power to the cooking appliance based on the operation history information.

Abstract: A negative electrode active material and a rechargeable lithium battery that includes the negative electrode active material, the negative electrode active material includes porous silicon secondary particles in which boron-doped silicon primary particles are agglomerated; and amorphous carbon and the rechargeable lithium battery includes a negative electrode including the negative electrode active material, a positive electrode and an electrolyte.

Abstract: A negative electrode active material, including a silicon-carbon composite particle including a plurality of silicon nanoparticles and amorphous carbon, wherein the silicon-carbon composite particle includes closed pores therein, a pore volume of a surface of the silicon-carbon composite particle measured by a BJH method is less than about 0.02 cm3/g, and a volume of the closed pores of the silicon-carbon composite particle calculated by Equation 1 is about 0.015 cm3/g to about 0.05 cm3/g.

Abstract: Disclosed are a negative active material for a rechargeable lithium battery and a rechargeable lithium battery. The negative active material for a rechargeable lithium battery includes a silicon-carbon composite; and graphene on a surface of the silicon-carbon composite, wherein a specific surface area of the negative active material is about 1.6 m2/g to about 2 m2/g.

Abstract: A negative active material for a rechargeable lithium battery, having a core including porous silicon and about 1 wt % to about 12 wt % based on 100 wt % of a total weight of the negative active material of magnesium and a carbon layer on a surface of the core, to more effectively inhibit the expansion of the negative electrode and thereby more effectively inhibit the expansion of the secondary battery.

Abstract: Provided are a heating apparatus and a method for controlling the heating apparatus. The heating apparatus includes a heating module, a display, a short-range wireless communication module, at least one memory storing one or more instructions, and at least one processor configured to execute the one or more instructions to establish a short-range wireless communication link with an exhaust device arranged on a flow path apart from an aspiration hob through the short-range wireless communication module, based on receiving a user input for turning on the heating apparatus, and control the exhaust device to perform an exhaust operation by transmitting operation information to the exhaust device through the established short-range wireless communication link, according to driving of the heating module.

Abstract: Provided is a beverage extraction apparatus including a water tank for storing water, a heater configured to heat the water supplied from the water tank, and a water distribution module configured to discharge the heated water toward the dripper from a plurality of locations. The water distribution module includes a water outlet member including a water outlet plate and a plurality of water outlets provided to pass through the water outlet plate, and the water distribution module is configured such that discharge times at which water begins to be discharged from the plurality of water outlets are different.

Abstract: A wireless power transmission apparatus for determining empty heating is provided. The wireless power transmission apparatus includes at least one processor configured to control a communication interface configured to communicate with a cooking appliance, wherein the communication interface is further configured to receive, from the cooking appliance, a temperature of a bottom surface of the cooking appliance and an internal temperature of the cooking appliance for a first time period during which a heating operation is performed and for a second time period following the first time period, during which the heating operation is stopped, and the at least one processor is further configured to stop the heating operation for the second time period, and determine whether the cooking appliance undergoes empty heating based on a relationship between the temperature of the bottom surface and the internal temperature for the second time period.

Abstract: A negative active material for a rechargeable lithium battery includes a composite of porous silicon and amorphous carbon, the composite having macropores with a size of about 50 nm or more, and a porosity of about 15% to about 40%.