Beijing Key Laboratory of Environmental Science and Engineering, School of Materials Science and Engineering, Beijing Institute of Technology , Beijing 100081, China.
School of Chemistry and Chemical Engineering, Beijing Institute of Technology , Beijing 100081, P. R. China.
ACS Appl Mater Interfaces. 2018 Feb 14;10(6):5560-5568. doi: 10.1021/acsami.7b17659. Epub 2018 Jan 31.
Sodium alginate (SA) is investigated as the aqueous binder to fabricate high-performance, low-cost, environmentally friendly, and durable TiO anodes in sodium-ion batteries (SIBs) for the first time. Compared to the conventional polyvinylidene difluoride (PVDF) binder, electrodes using SA as the binder exhibit significant promotion of electrochemical performances. The initial Coulombic efficiency is as high as 62% at 0.1 C. A remarkable capacity of 180 mAh g is achieved with no decay after 500 cycles at 1 C. Even at 10 C (3.4 A g), it remains 82 mAh g after 3600 cycles with approximate 100% Coulombic efficiency. TiO electrodes with SA binder display less electrolyte decomposition, fewer side reactions, high electrochemistry reaction activity, effective suppression of polarization, and good electrode morphology, which is ascribed to the rich carboxylic groups, high Young's modulus, and good electrochemical stability of SA binder.
海藻酸钠（SA）首次被研究作为水基粘结剂，用于制备高性能、低成本、环保且耐用的钠离子电池（SIBs）中的 TiO 阳极。与传统的聚偏二氟乙烯（PVDF）粘结剂相比，使用 SA 作为粘结剂的电极表现出电化学性能的显著提升。在 0.1 C 时，初始库仑效率高达 62%。在 1 C 下经过 500 次循环后，没有衰减，实现了 180 mAh g 的显著容量。即使在 10 C（3.4 A g）下，经过 3600 次循环后，仍保持 82 mAh g 的容量，库仑效率约为 100%。具有 SA 粘结剂的 TiO 电极显示出较少的电解质分解、较少的副反应、高的电化学反应活性、有效抑制极化以及良好的电极形态，这归因于 SA 粘结剂丰富的羧基、高杨氏模量和良好的电化学稳定性。
