当前位置: X-MOL 学术Adv. Mater. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Designing Adaptive Binders for Microenvironment Settings of Silicon Anode Particles
Advanced Materials ( IF 29.4 ) Pub Date : 2021-02-25 , DOI: 10.1002/adma.202007460
Haesung A. Lee 1 , Mikyung Shin 2 , Jaemin Kim 3 , Jang Wook Choi 3 , Haeshin Lee 1
Affiliation  

This study reports the concept of an “adaptive binder” to address the silicon anode challenge in Li‐ion batteries. Binders exhibit adaptable capabilities upon gradual changes in the microenvironments surrounding silicon particles during anodic expansion–shrinkage cycles. Long, flexible binder chains are repositioned and reoriented upon the gradual formation of Si‐micro‐environments (Si‐μ‐env) during the early battery cycles. At this stage, the chemical interactions between the polymeric binders are reversible hydrogen bonds. As the Si‐μ‐env become stably set by repeated battery cycles, the chemical interactions exhibit reversible‐to‐irreversible transitions by the formation of covalent linkages between the binder polymers at the later stage of cycles. The binder polymer showing the aforementioned adaptive properties is hyaluronic acid, which has never been explored as a silicon‐anode binder material, onto which the plant‐inspired adhesive phenolic moiety, gallol (1,2,3‐trihydroxybenzene), is conjugated (HA–GA) for stable adhesion to the surfaces of silicon particles. It is confirmed that the HA–GA binder can maintain a charge capacity that is approximately 3.3 times higher (1153 mAh g−1) than that of the nonconjugated HA binder (347 mAh g−1) after 600 cycles even at a rapid charge/discharge rate of 1 C (3500 mA g−1), indicating that adaptive properties are an important factor to consider in designing silicon‐anode binders.

中文翻译:

设计用于硅阳极颗粒微环境设置的自适应粘合剂

这项研究报告了“适应性粘合剂”的概念,以解决锂离子电池中的硅阳极挑战。在阳极膨胀-收缩循环过程中,围绕硅颗粒的微环境逐渐变化,粘合剂具有适应能力。在早期的电池循环过程中,随着硅微环境(Si-μ-env)的逐渐形成,长而灵活的粘合剂链将重新定位并重新定向。在这一阶段,聚合物粘合剂之间的化学相互作用是可逆的氢键。由于通过反复的电池循环使Si-env稳定下来,在循环的后期阶段,由于粘合剂聚合物之间共价键的形成,化学相互作用表现出可逆至不可逆的转变。表现出上述适应性的粘合剂聚合物是透明质酸,从未被探索为硅阳极粘合剂材料,其上结合了植物启发性酚基胆甾醇(1,2,3-三羟基苯)(HA–GA),可稳定粘附至硅颗粒表面。可以肯定的是,HA–GA粘合剂可以保持约3.3倍的高充电容量(1153 mAh g-1)比非HA粘合剂(347毫安克-1即使在1个C(3500毫安g的快速充电/放电速率600次循环后)-1),表明自适应性质是要考虑的一个重要因素设计硅阳极粘合剂。
更新日期:2021-04-01
down
wechat
bug