Affiliation:
1. Division of Energy Storage Dalian National Laboratory for Clean Energy (DNL) Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 P. R. China
2. University of Chinese Academy of Sciences Beijing 100049 P. R. China
3. Chemical Engineering Research Center School of Chemical Engineering and Technology Tianjin University Tianjin 300350 P. R. China
Abstract
AbstractSilicon (Si) is regarded as a promising anode material for high‐energy‐density lithium‐ion batteries due to its high specific capacity (4200 mAh g−1) and low potential (0.3 V vs Li+/Li). However, the large volume change (over 300%) of Si during the lithiation/delithiation process leads to severe pulverization, electrode structure destruction, and finally capacity fading, which slows down its step to practical application. Herein, a poly(vinylamine) (PVAm) binder containing amino (NH2) and amide (NHCHO) is proposed to improve the stability of Si anodes from particle to electrode structure. The N‐containing functional groups show strong interaction with the Si particles and form a uniform and thin layer on the surface, which would decompose and form an N‐rich inorganic solid electrolyte interphase (SEI) layer during discharging. The high mechanical stability N‐rich SEI helps relieve the pulverization of Si particles through stress dissipation, maintains electrode structural stability, and reduces the loss of active materials. Thus, the Si anode with PVAm binder exhibits high capacity of ≈2000 mAh g−1 after 200 cycles, which is much higher than that of using Poly(vinylidene fluoride) (PVDF) binder (66 mAh g−1) and Poly(vinyl alcohol) PVA binder (820 mAh g−1). This facile and practical strategy provides a new perspective for the application of Si anodes in advanced batteries.
Funder
National Natural Science Foundation of China
Subject
Electrochemistry,Condensed Matter Physics,Biomaterials,Electronic, Optical and Magnetic Materials
Cited by
9 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献