Natural polysaccharides have gained much attention as aqueous binders for lithium‐ion batteries due to low cost, abundance and non‐toxicity. Herein, we report for the first time the use of Tamarind Kernel Powder (TKP) as an aqueous binder for graphite anode. The graphite electrodes have been fabricated using 3, 4 and 5 wt.% of TKP binder and their electrochemical performances are studied. Among these, the electrode with 4 wt.% binder content shows the best electrochemical performance. It delivers an initial discharge capacity of 426 mAh g⁻¹ and retains the capacity of 343 mAh g⁻¹ after 100 cycles at 0.1 C (0.1 C=37.2 mA g⁻¹). It exhibits a first cycle reversible capacity of 326 mAh g⁻¹ at 1 C with good cycling stability for 500 cycles, which is much better than the graphite electrode with conventional PVdF (4 wt.%) binder (first cycle: 103 mAh g⁻¹). In addition, it demonstrates good rate capability up to 50 C. The fabricated TKP/Graphite electrode exhibits a discharge capacity of 55 mAh g⁻¹ at 50 C, whereas under the similar conditions the PVdF counterpart delivers only 20 mAh g⁻¹. In addition, a full cell has been fabricated with NMC532/C‐TK4 electrodes, which delivers a discharge capacity of 121 mAh g⁻¹ at 1 C with a capacity retention >84% after 50 cycles. The superior performance of the aqueous binder based graphite electrode can be ascribed to the good solubility, high lithium ion conductivity, and better wettability of TKP binder. Hence, TKP plays a remarkable role as a binder in the electrode fabrication for the application of lithium‐ion batteries.

中文翻译：

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锂离子电池中用于石墨阳极的可持续罗望子核粉基水性粘合剂

天然多糖由于其低成本，丰度和无毒性而作为锂离子电池的水性粘合剂备受关注。在此，我们首次报道了罗望子仁粉末（TKP）作为石墨阳极的水性粘合剂的用途。用3、4和5重量％的TKP粘合剂制造了石墨电极，并研究了它们的电化学性能。其中，粘合剂含量为4重量％的电极表现出最佳的电化学性能。它的初始放电容量为426 mAh g ^-1，在0.1 C（0.1 C = 37.2 mA g ^-1）下循环100次后仍保持343 mAh g ^-1的容量。它的第一循环可逆容量为326 mAh g ^-1在1 C下具有500个循环的良好循环稳定性，这比具有常规PVdF（4 wt。％）粘合剂（第一循环：103 mAh g ^-1）的石墨电极要好得多。另外，它在高达50 C的温度下显示出良好的倍率能力。制造的TKP /石墨电极在50 C的温度下具有55 mAh g ^-1的放电容量，而在类似条件下，PVdF对应的电极仅提供20 mAh g ^-1的放电容量。此外，已经用NMC532 / C-TK4电极制造了一个完整的电池，其放电容量为121 mAh g ^-1在1 C下50次循环后容量保持率> 84％。水性粘合剂基石墨电极的优异性能可归因于TKP粘合剂的良好溶解性，高锂离子传导性和更好的润湿性。因此，在锂离子电池应用的电极制造中，TKP扮演着重要的角色。