【摘要】 水葫芦作为一种廉价的生物质资源,对其进行物理、化学处理后得到疏松多孔的碳材料。将该碳材料用于锂离子电池负极时,在1000 mA g^-1的电流密度下循环100次可逆容量保持在283 mAh g^-1,即使在10 A g^-1的电流密度下,可逆容量仍高达125 mAh g^-1,表现出较好的倍率性能。用作钠离子电池负极时,在100 mA g^-1的电流密度下可逆容量达到145 mAh g^-1,在1000 mA g^-1下循环100次可逆容量依然可以保持在123 mAh g^-1。该电极材料优异的电化学性能可归因于其疏松多孔的结构,这有利于活性材料与电解液充分接触,同时为锂/钠离子存储提供更多的位点,并且有利于离子的快速传输。更多还原

【Abstract】 Porous carbon was prepared from water hyacinth,a very low cost biomass resource,by physical and chemical treatment.Used as anode for lithium ion batteries,the porous carbon electrode could maintain a reversible capacity of 283 mAh g^-1 at a current density of 1000 mA g^-1 after 100 cycles,and shows good rate capability as well,delivering 125 mAh g^-1 even at 10 A g^-1.Tested against Na,the electrode offers a reversible capacity of 145 mAh g^-1 at 100 mA g^-1,and a reversible capacity of 123 mAh g^-1 could be maintained at 1000 mA g^-1 after 100 cycles.The excellent electrochemical performance of the prepared material can be ascribed to its loose and porous structure,which is beneficial for the contact between active material and the electrolyte,could provide more storage sites for Li+/Na+and is helpful for fast ions transfer.更多还原