LAUSR

Four types of sustainable sodium carboxylate-derived materials are investigated as novel electrodes with high performance for lithium-ion batteries. Benefiting from the porous morphology provided by their intermolecular interactions, increasing capacity, excellent cycle stability and superior rate performance are observed for the sodium carboxylate- derived materials. The sodium oxalate (SO) electrodes displayed an increasing discharging capacity at a current density of 50 mA g−1 with with maximum values of 242.9 mA h g−1 for SO-631 and 373.9 mA h g−1 for SO-541 during the 100th cycle. In addition, the SO-541, SC-541 (sodium citrate), ST- 541 (sodium tartrate) and SP-541 (sodium pyromellitate) electrode materials displayed high initial capacities of 619.6, 392.3, 403.7 and 278.1 mA h g−1, respectively, with capacity retentions of 179%, 148%, 173% and 108%, respectively, after 200 cycles at 50 mA g−1 with. Even at a high current density of 2,000 mA g−1 with, the capacities remain 157.6, 131.3, 146.6 and 137.0 mA h g−1, respectively. With these superior electrochemical properties, the sodium carboxylate-derived materials could be considered as promising organic electrode materials for large-scale sustainable lithium-ion batteries.摘要本文选取四种羧酸钠盐化合物, 研究了它们作为新型锂离子电池电极材料的电化学性能. 结果表明, 由于分子间相互作用产生的多孔形态, 羧酸钠盐衍生材料显示出逐渐增加的容量、 优良的循环稳定性和倍率性能. 对于SO-541(草酸钠)、 SC-541(柠檬酸钠)、 St-541(酒石酸钠)和SP-541(均苯四甲酸钠)电极材料, 在50 mA g−1的电流密度下, 200次循环后的容量仍保持在619.6, 392.3, 403.7和278.1 mA h g−1, 容量保持率分别为179%, 148%, 173%和108%, 甚至在2000 mA g−1的高电流密度下, 其容量仍分别保持在157.6, 131.3, 146.6和137.0 mA h g−1. 这些优异的电化学性能, 使羧酸钠衍生材料有望成为大型锂离子电池的有机电极材料.