Nitrogen-Doped Carbon-Coating Disproportionated SiO Materials as Long Cycling Stable Anode for Lithium Ion Batteries

Molecules

Binbin Chu¹  Ben Huang¹  Aishui Yu¹  Tao Huang² 

[1] Collaborative Innovation Center of Chemistry for Energy Materials, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Department of Chemistry, Institute of New Energy, Fudan University, Shanghai 200438, China;Laboratory of Advanced Materials, Fudan University, Shanghai 200438, China;

关键词: lithium ion batteries;    anode;    silicon;    carbon coating;    nitrogen-doped;    high energy density;   

DOI  :  10.3390/molecules26061536

来源: DOAJ

【 摘 要 】

Silicon monoxide (SiO) is a kind of promising anode material for lithium-ion batteries because of its smaller volume change during the charge and discharge process than pure silicon and its higher theoretical capacity than commercialized graphite. However, its fast-fading capacity still restricts the development of practical application of SiO. A simple and cheap strategy to dope nitrogen and coat carbon on the surface of disproportionated SiO is proposed to improve the cycling stability significantly even at a high specific current. The capacity retention is nearly 85% after 250 cycles and more than 69% after 500 cycles at a specific current of 1000 mA g⁻¹. Even at a specific current of 2000 mA g⁻¹, its cycling performance behaves similarly to that of 1000 mA g⁻¹. Nitrogen doping in materials could improve the conductivity of materials because pyridinic nitrogen and pyrrolic nitrogen could improve the electron conductivity and provide defects to contribute to the diffusion of lithium ions. The use of pitch and melamine, which are easily available industrial raw materials, makes it possible to contribute to the practical application.

【 授权许可】

Unknown