Acacia Senegal-Inspired Bifunctional Binder for Longevity of Lithium-Sulfur Batteries
Acacia Senegal-Inspired Bifunctional Binder for Longevity of Lithium-Sulfur Batteries
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DOI：
10.1002/aenm.201500878
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发表时间：
2015-11-04
影响因子：
27.8
通讯作者：
Zhang, Shanqing
中科院分区：
文献类型：
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作者：
Li, Gaoran;Ling, Min;Zhang, Shanqing
传统锂硫电池中的硫磺正极由于多硫化物穿梭效应和充放电过程中体积变化大，循环性能差。阿拉伯树胶(GA)是一种来自塞内加尔相思的低成本、无毒和可持续的天然聚合物，被用作硫阴极的粘合剂来解决这些问题。GA优异的力学性能使阴极具有较高的结合强度和合适的延展性来缓冲体积变化，而官能团在化学和物理上限制了阴极中的硫物种，从而抑制了多硫化物的穿梭效应。此外，GA将电极制造过程从有机溶剂法转变为水溶液法，消除了有毒有机溶剂的使用，并获得了阻抗较低的均匀分布的电极。由于GA粘结剂的双重作用，在C/5的低电流速率下，在500次循环中获得了显著的循环性能，即841mAg(-1)。
The sulfur cathode in traditional lithium-sulfur batteries suffers from poor cyclability due to polysulfide shuttling effect as well as large volume change during charge/discharge processes. Gum arabic (GA), a low cost, nontoxic, and sustainable natural polymer from Acacia senegal, is adopted as a binder for the sulfur cathode to address these issues. The excellent mechanical properties of GA endow the cathode with high binding strength and suitable ductility to buffer volume change, while the functional groups chemically and physically confine sulfur species within the cathode to inhibit the shuttling effect of polysulfides. Additionally, GA shifts the electrode fabrication process from the organic solvent process to an aqueous process, eliminates the use of toxic organic solvents, and achieves uniformly distributed electrode with lower impedance. A remarkable cycling performance, i.e., 841 mAh g(-1) at low current rate of C/5, is achieved throughout 500 cycles due to the bifunctions of the GA binder.