Abstract:
An apparatus for charging a rechargeable battery includes a voltage detector which detects a voltage between the terminals of a rechargeable battery; a current generator which generates a current for charging the rechargeable battery; and a controller which controls the current generator based on the value of the voltage detected by the voltage detector. Direct current (DC) for charging the rechargeable battery is inputted to the rechargeable battery. A current direction between the terminals of the rechargeable battery is periodically and intermittently inverted in the middle of a charging section where the DC is inputted to the rechargeable battery.
Abstract:
PURPOSE: A porous carbon based composite material, an anode, a lithium air cell including the same and a manufacturing method thereof are provided to produce a lithium air cell with improved energy efficiency and reduced polarization when charging or discharging. CONSTITUTION: A porous carbon based composite material includes an oxygen functional group, a carbon nanotube, and heterogenous atom doped modified carbon-containing material. The rate of the surface oxygen atom number about the surface carbon atom number of the porous carbon type composite material is 2-15 atomic%. The porous carbon type composite material includes a core including oxygen functional group-carbon nanotube and a coating layer arranged to cover some part of the core. The coating layer contains heterogenous atom doped modified carbon-containing material.
Abstract:
PURPOSE: A porous carbon-based composite material is provided to reduce charging and discharging overvoltage of a lithium air battery, and to increase energy efficiency. CONSTITUTION: A porous carbon-based composite material comprises carbon nanotubes and a heteroatom-doped modified carbon material. A positive electrode comprises the porous carbon-based composite material and a binder, and uses oxygen as a positive electrode active material. A lithium air battery(10) comprises a negative electrode(13) which can discharge and/or charge lithium, a positive electrode(15), and an electrolyte(18) which fills between the negative electrode and the positive electrode.
Abstract:
Pt-Co계 제1 촉매, Ce계 제2 촉매 및 탄소계 촉매 담체를 포함하는 연료전지용 전극촉매, 그 제조방법, 상기 전극촉매를 포함하는 전극을 구비한 연료가 제공된다. 상기 전극촉매의 제조방법은 Pt 전구체, Co 전구체 및 Ce 전구체를 산화시켜 금속 산화물의 혼합물을 얻는 단계; 상기 금속 산화물을 포함하는 혼합물에 수소 버블링(bubbling) 조건 하에서 탄소계 촉매 담체를 함침시키는 단계; 및 상기 결과물을 수소 분위기 하에서 200 내지 350℃에서 열처리하는 단계를 포함한다.