Facile preparation of silicon/carbon composite with porous architecture for advanced lithium-ion battery anode

作者：Shi, Haofeng; Zhang, Wenyuan; Wang, Donghua; Wang, Jiashuai; Wang, Chengdeng; Xiong, Zhihao; Chen, Fu-Rong^*; Dong, Hailiang; Xu, Bingshe^*; Yan, Xiaoqin^*

来源：Journal of Electroanalytical Chemistry, 2023, 937: 117427.

DOI：10.1016/j.jelechem.2023.117427

• Silicon-based anode
• Carbon
• Porous structure
• Ball milling
• Lithium-ion batteries

Silicon is a potential anode material for Li battery due to its high theoretical specific capacity (4200 mAh g-1). However, Si is hampered for practical application in Li-battery due to its enormous volume alternation causing instability. Herein, we demonstrated a novel carbon-coated porous structure (C@void/Si-G) synthesized by uniformly wrapping Si into pitch pyrolytic carbon shells and then in-situ removing the sodium chloride tem-plate can overcome the bottleneck. It is worth noting that our process for C@void/Si-G also offers a simple route for cost down and mass production of anode material. The C@void/Si-G anodes exhibit an excellent capacity of 1082.7 mAh g-1 at 0.2 C after 200 cycles. Furthermore, it holds a high capacity retention of 81.9 % after 500 cycles at 0.5 C. We found that C@void/Si-G composite only rises about 41% volumetric expansion during 500 operation cycles. This can effectively avoid direct contact between silicon and electrolyte to form a stable solid electrolyte interphase (SEI) film. Especially, practical application of the C@void/Si-G anode is demonstrated in a full cell pairing with LiNi0.3Co0.3Mn0.3O2 cathode. The full cell presents great cycle retention of 90.1 % at 0.2 C after 100 cycles and a high energy density (446 Wh kg-1).

• 单位
  北京科技大学