Key Laboratory of Optoelectronic Chemical Materials and Devices (Ministry of Education), Jianghan University, Wuhan 430056, China.
Hubei Key Laboratory of Plasma Chemistry and Advanced Materials, School of Materials Science and Engineering, Wuhan Institute of Technology, Wuhan 430205, China.
ACS Appl Mater Interfaces. 2023 Jun 28;15(25):30302-30311. doi: 10.1021/acsami.3c05103. Epub 2023 Jun 19.
Silicon suboxide (SiO) anodes have attracted considerable attention owing to their excellent cycling performance and rate capability compared to silicon (Si) anodes. However, SiO anodes suffer from high volume expansion similar to Si anodes, which has been a challenge in developing suitable commercial binders. In this study, a water-soluble polyamide acid (WS-PAA) binder with ionic bonds was synthesized. The amide bonds inherent in the WS-PAA binder form a stable hydrogen bond with the SiO anode and provide sufficient mechanical strength for the prepared electrodes. In addition, the ionic bonds introduced by triethylamine (TEA) induce water solubility and new Li transport channels to the binder, achieving enhanced electrochemical properties for the resulting SiO electrodes, such as cycling and rate capability. The SiO anode with the WS-PAA binder exhibited a high initial capacity of 1004.7 mAh·g at a current density of 0.8 A·g and a capacity retention of 84.9% after 200 cycles. Therefore, WS-PAA is a promising binder for SiO anodes compared with CMC and SA.
硅亚氧化物（SiO）阳极由于其循环性能和倍率性能优于硅（Si）阳极而受到广泛关注。然而，SiO 阳极与 Si 阳极一样存在体积膨胀率高的问题，这在开发合适的商业粘结剂方面是一个挑战。在本研究中，合成了一种具有离子键的水溶性聚酰胺酸（WS-PAA）粘结剂。WS-PAA 粘结剂中固有的酰胺键与 SiO 阳极形成稳定的氢键，并为制备的电极提供足够的机械强度。此外，三乙胺（TEA）引入的离子键使粘结剂具有水溶性和新的 Li 传输通道，从而提高了所得 SiO 电极的电化学性能，如循环性能和倍率性能。与 CMC 和 SA 相比，含有 WS-PAA 粘结剂的 SiO 阳极在 0.8 A·g 的电流密度下具有 1004.7 mAh·g 的初始高容量，并且在 200 次循环后容量保持率为 84.9%。因此，与 CMC 和 SA 相比，WS-PAA 是一种有前途的 SiO 阳极粘结剂。
