Highly Ordered Mesoporous Carbon Support Materials for Air Electrode of Lithium Air Secondary Batteries

Abstract

The electrochemical properties of a lithium air secondary battery (LAB) cell incorporating CMK-3 or carbon replica (CR) as a highly ordered mesoporous carbon support material were examined under the condition of a current density of 0.1 mA/cm 2 with a voltage range of 2.0 to 4.2 V in a dry air atmosphere. The first discharge capacities of the LAB cell incorporating Pt 10 Ru 90 electrocatalyst/CMK-3 and CR were 103 and 1000 mAh/g, respectively. The cycle properties of the LAB cell incorporating Pt 10 Ru 90 electrocatalyst/CMK-3 was poor; in contrast, the one incorporating CR showed better cycle stability (828 mAh/g up to 9 cycles). These superior properties with CR are due to its larger surface area and larger total pore volume than those of CMK-3.

Electrochemical Properties of Large-Discharge-Capacity Air Electrodes with Nickel Foam Sheet Support for Lithium Air Secondary Batteries

“…Most of the LAB cells with an air electrode composed of carbon and binder without an electrocatalyst have exhibited poor cycle performance. 3,5,7,13,15,27,29 Here, Pt 10 Ru 90 /KB electrocatalyst, as reported in our previous paper, 8 was used to improve the cycle properties. In that paper, the air electrode with micrometer-order thickness was prepared by coating Pt 10 Ru 90 /KB on the Ti mesh.…”

“…Additionally, the inadequate stability of the nonaqueous electrolyte solutions due to oxygen radicals lead to a gradual decrease in discharge capacities during discharge/ charge cycles. Therefore, much work has investigated the airelectrode materials, including the electrocatalyst, [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] and the electrolyte solutions 1,[17][18][19][20][21][22][23][24][25][26] from the viewpoint of improving the battery cycle performance.…”

“…The various kinds of air-electrode materials that have been examined to decrease the large overpotentials for both the electrode reaction of oxygen reduction/evolution include materials with high surface area or porous carbon materials 2,3 and highly active electrocatalysts, such as metal phthalocyanine, 1,4 noble metal alloys (Pt, Ru, Pd and Pt-Ru), [5][6][7][8]10,17 single metal oxides (MnO 2 , Co 3 O 4 , RuO 2 ) [5][6][7][8][9][10][11][12][13][14] and Fe-, Mn-, and Co-based perovskite-type complexed oxides. 15,16 Recently, we have investigated the electrocatalytic activities of Pt 100¹x Ru x (0¯x¯100) for air electrodes.…”

Strategies toward High‐Performance Cathode Materials for Lithium–Oxygen Batteries

“…Mesopores in carbon can function as active sites during the discharge process . Mesoporous carbon materials with well‐controlled pore size have been employed as efficient air‐diffusion cathode for Li–O 2 batteries . Mesoporous carbon with uniform nanopores and large surface area was prepared by using triblock copolymer F127 (PEO 106 PPO 70 PEO 106 , M W = 12 600) as a soft template .…”

“…Porous carbon materials with varying pore structures, tailorable pore size, high electronic conductivity, and relatively good electrochemical stability are regarded as appropriate catalyst supports for the generation of composite cathode catalysts for efficient and durable Li–O 2 batteries . Ru‐nanoparticle‐decorated hierarchically ordered macro‐mesoporous carbon (MmC@Ru) and 3D mesoporous graphene‐like carbon were prepared through a hard template method.…”