The overwhelming advantage of Si nanoparticles (SiNPs) over Si microsized particles (SiMPs) as anode materials is compromised by their severe side reactions with electrolyte and agglomeration during cycling. Unlike usual solutions such as surface encapsulation or coating, here, a new strategy was proposed by mimicking the self-healing ability of living organisms. Ureidopyrimidinone functionalized polyethylene glycol (UPy-PEG-UPy) was successfully synthesized. Taking it as binder, SiNPs achieved excellent electrochemical performance with an initial coulombic efficiency (ICE) as high as 81% and a reversible capacity of 1454 mAh/g after 400 cycles corresponding to an average capacity decay of 0.04% per cycle. This achievement is attributed to the self-healing ability of UPy-PEG-UPy, which enables to spontaneously heal micro-cracks on electrode prior to its propagation, therefore preventing Si particles agglomeration and maintaining electrode integrity.

作为阳极材料，Si纳米颗粒（SiNPs）相对于Si微米级颗粒（SiMPs）具有压倒性的优势，因为它们在循环过程中与电解质和团聚的严重副反应而受损。与通常的解决方案（例如表面封装或涂层）不同，此处提出了一种通过模仿生物体的自我修复能力的新策略。尿嘧啶嘧啶酮官能化的聚乙二醇（UPy-PEG-UPy）已成功合成。SiNPs用作粘合剂，具有出色的电化学性能，初始库仑效率（ICE）高达81％，在400次循环后的可逆容量为1454 mAh / g，相当于每个循环的平均容量衰减为0.04％。这一成就归因于UPy-PEG-UPy的自我修复能力，